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Apx B_Archaeo Resources Assessment Appendix B Archaeological Resources Assessment Appendix B Archaeological Resources Assessment Kimley»Horn Appendix B Archaeological Resources Assessment Kimley»Horn Appendix B Archaeological Resources Assessment Kimley»Horn Archaeological Resources Assessment for the 1515 Walnut Grove Avenue Project in the City of Rosemead Los Angeles County, California Prepared by: Jamie Parra, MA, RPA and Christina Livingston, MA Cultural Resources Management Kimley-Horn and Associates, Inc. December 2025 Archaeological Resources Assessment for the 1515 Walnut Grove Avenue Project in the City of Rosemead Los Angeles County, California Kimley»Horn Expect More. Experience Better. Prepared by: Jamie Parra, MA, RPA and Christina Livingston, MA Cultural Resources Management Kimley-Horn and Associates, Inc. December 2025 Archaeological Resources Assessment for the 1515 Walnut Grove Avenue Project in the City of Rosemead Los Angeles County, California Kimley»Horn Expect More. Experience Better. Prepared by: Jamie Parra, MA, RPA and Christina Livingston, MA Cultural Resources Management Kimley-Horn and Associates, Inc. December 2025 Archaeological Resources Assessment for the 1515 Walnut Grove Avenue Project in the City of Rosemead Los Angeles County, California Kimley»Horn Expect More. Experience Better. Prepared by: Jamie Parra, MA, RPA and Christina Livingston, MA Cultural Resources Management Kimley-Horn and Associates, Inc. December 2025 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | ii TABLE OF CONTENTS 1.0 INTRODUCTION ................................................................................................................................. 1 1.1 Project Description ......................................................................................................... 1 1.2 Regulatory Setting ............................................................. Error! Bookmark not defined. 2.0 METHODS ......................................................................................................................................... 7 3.0 PROJECT SETTING .............................................................................................................................. 7 3.1 Natural Setting ............................................................................................................... 7 3.2 Ethnographic Setting ...................................................................................................... 8 3.3 Prehistoric Setting .......................................................................................................... 9 4.0 RESULTS .......................................................................................................................................... 10 4.1 Archaeological Record Search ....................................................................................... 10 4.2 Sacred Land File Search ................................................................................................ 10 4.3 Database Review .......................................................................................................... 11 5.0 CONCLUSION AND RECOMMENDATIONS ....................................................................................... 13 5.1 Archaeological Resources ............................................................................................. 13 5.2 Recommendations ....................................................................................................... 13 6.0 REFERENCES .................................................................................................................................... 15 APPENDICES Appendix A: Sacred Lands File Search Results City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment TABLE OF CONTENTS 1.0 INTRODUCTION......ccoiiiiiiinnnnnnnnnssssssssssssssssssssssssssssssssssssnns 1 1.1 [a oT =Toi B12of 4 ou To o FSU 1 1.2 Regulatory Setting... cocci Error! Bookmark not defined. 2.0 METHODS ........cooovvimmmmmmmmmmmmmmnmnsnnssssssssnsssnnnnnnnnnnnnnnn 7 3.0 PROJECT SETTING.........coevvrrrrmnnnnnnnnnnnssnnnnnnnnnsnnnsnnnnsnnnnnnnnnnnn 7 3.1 NEB |INT | oS 7 3.2 [0g a ToTed = 0] a Lol Y=) 1] = 8 3.3 a C= TE oY Fol Y=) 1] = 9 QO RESULTS .....coovrmmmnnnnnnnnnnnnnnnnnnnnnnnsssssssssssssssssssssssssnes 10 4.1 Archaeological Record Search....... oer 10 4.2 Sacred Land File SEArCh ......oooee eee cere e reer eee errr 10 4.3 Database REVIEW........coi iii eee creer eres e seer rere eee e eee r renee eee errennann naan 11 5.0 CONCLUSION AND RECOMMENDATIONS .....ccoorrrrmmmmmmmnnnnnnnnnnn 13 5.1 Archaeological RESOUICES ........... cee eee errr secre reese errr rare eee eee r ranean 13 5.2 (¥=YoleTy 0] T=] oT 1 4 To 1-3 13 6.0 REFERENCES. .............oovvvmmmmmmnnnnnnnsesssssssssssssssnsssnnnnnnnnnn 15 APPENDICES Appendix A: Sacred Lands File Search Results September 2025 Page | ii Kimley»Horn ............................................. 1 1... City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment TABLE OF CONTENTS 1.0 INTRODUCTION......ccoiiiiiiinnnnnnnnnssssssssssssssssssssssssssssssssssssnns 1 1.1 [a oT =Toi B12of 4 ou To o FSU 1 1.2 UCT dB FY oT QV AY a| oUt 1 2.0 METHODS ........cooovvimmmmmmmmmmmmmmnmnsnnssssssssnsssnnnnnnnnnnnnnnn 7 3.0 PROJECT SETTING.........coevvrrrrmnnnnnnnnnnnssnnnnnnnnnsnnnsnnnnsnnnnnnnnnnnn 7 3.1 NEB |INT | oS 7 3.2 [0g a ToTed = 0] a Lol Y=) 1] = 8 3.3 a C= TE oY Fol Y=) 1] = 9 QO RESULTS .....coovrmmmnnnnnnnnnnnnnnnnnnnnnnnsssssssssssssssssssssssssnes 10 4.1 Archaeological Record Search....... oer 10 4.2 Sacred Land File SEArCh ......oooee eee cere e reer eee errr 10 4.3 Database REVIEW........coi iii eee creer eres e seer rere eee e eee r renee eee errennann naan 11 5.0 CONCLUSION AND RECOMMENDATIONS .....ccoorrrrmmmmmmmnnnnnnnnnnn 13 5.1 Archaeological RESOUICES ........... cee eee errr secre reese errr rare eee eee r ranean 13 5.2 (¥=YoleTy 0] T=] oT 1 4 To 1-3 13 6.0 REFERENCES. .............oovvvmmmmmmnnnnnnnsesssssssssssssssnsssnnnnnnnnnn 15 APPENDICES Appendix A: Sacred Lands File Search Results September 2025 Page | ii Kimley»Horn City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment TABLE OF CONTENTS 1.0 INTRODUCTION......ccoiiiiiiinnnnnnnnnssssssssssssssssssssssssssssssssssssnns 1 1.1 [a oT =Toi B12of 4 ou To o FSU 1 1.2 UCT dB FY oT QV AY a| oUt 1 2.0 METHODS ........cooovvimmmmmmmmmmmmmmnmnsnnssssssssnsssnnnnnnnnnnnnnnn 7 3.0 PROJECT SETTING.........coevvrrrrmnnnnnnnnnnnssnnnnnnnnnsnnnsnnnnsnnnnnnnnnnnn 7 3.1 NEB |INT | oS 7 3.2 [0g a ToTed = 0] a Lol Y=) 1] = 8 3.3 a C= TE oY Fol Y=) 1] = 9 QO RESULTS .....coovrmmmnnnnnnnnnnnnnnnnnnnnnnnsssssssssssssssssssssssssnes 10 4.1 Archaeological Record Search....... oer 10 4.2 Sacred Land File SEArCh ......oooee eee cere e reer eee errr 10 4.3 Database REVIEW........coi iii eee creer eres e seer rere eee e eee r renee eee errennann naan 11 5.0 CONCLUSION AND RECOMMENDATIONS .....ccoorrrrmmmmmmmnnnnnnnnnnn 13 5.1 Archaeological RESOUICES ........... cee eee errr secre reese errr rare eee eee r ranean 13 5.2 (¥=YoleTy 0] T=] oT 1 4 To 1-3 13 6.0 REFERENCES. .............oovvvmmmmmmnnnnnnnsesssssssssssssssnsssnnnnnnnnnn 15 APPENDICES Appendix A: Sacred Lands File Search Results September 2025 Page | ii Kimley»Horn City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 1 1.0 INTRODUCTION Kimley-Horn and Associates, Inc. (Kimley-Horn) conducted an Archaeological Resources Assessment for the 1515 Walnut Grove Avenue Project (Project) located within the City of Rosemead (Lead Agency) in Los Angeles County, California. This study was completed to support the Lead Agency’s review of potential impacts to archaeological resources as a result of the proposed Project. A literature review and records search were conducted for the property to identify the likelihood of present archaeological resources that would be adversely impacted by the Project. Due to the existing built environment and inability to survey for archaeological resources, the assessment did not include archaeological fieldwork. As the scope of this assessment is to identify potential impacts to archaeological resources, historic built environment resources are not addressed in this report. 1.1 Project Description The Project area is located in the south-central portion of the City of Rosemead in the County of Los Angeles, California (Figure 1). Specifically, the Project area is located at 1515 Walnut Grove Avenue and situated on Assessor Parcel Number 5279-027-001 (Figure 2). The property is currently bounded by Walnut Grove Avenue to the east, commercial buildings to the north, single-family housing to the west, and institutional uses to the south. The Project will involve the demolition of an existing Southern California Edison building and detached central plant building and will construct 191 townhome dwelling units. Vehicular access provisions for the property would be provided via two full-movement unsignalized driveways along Walnut Grove Avenue. The proposed Opening Year for the Project is 2029. The Project will be developed in a single project phase. 1.2 Regulatory Setting California Environmental Quality Act The California Environmental Quality Act (CEQA) applies to all discretionary projects undertaken or subject to approval by the State’s public agencies (California Code of Regulations [CCR] 14(3), § 15002(i)). Under CEQA, “A project with an effect that may cause a substantial adverse change in the significance of a historical resource is a project that may have a significant effect on the environment” (CCR Tit. 14(3), § 15064.5(b)). Guidelines for Implementation of the California Environmental Quality Act (CEQA Guidelines) Section 15064.5(a) defines a “historical resource” as a resource that meets one or more of the following criteria: • Listed in, or eligible for listing in, the California Register of Historical Resources (California Register or CRHR) • Listed in a local register of historical resources (as defined at Cal. Public Res. Code § 5020.1(k)) • Identified as significant in a historical resource survey meeting the requirements of § 5024.1(g) of the Cal. Public Res. Code City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 1.0 INTRODUCTION Kimley-Horn and Associates, Inc. (Kimley-Horn) conducted an Archaeological Resources Assessment for the 1515 Walnut Grove Avenue Project (Project) located within the City of Rosemead (Lead Agency) in Los Angeles County, California. This study was completed to support the Lead Agency’s review of potential impacts to archaeological resources as a result of the proposed Project. A literature review and records search were conducted for the property to identify the likelihood of present archaeological resources that would be adversely impacted by the Project. Due to the existing built environment and inability to survey for archaeological resources, the assessment did not include archaeological fieldwork. As the scope of this assessment is to identify potential impacts to archaeological resources, historic built environment resources are not addressed in this report. 1.1 Project Description The Project area is located in the south-central portion of the City of Rosemead in the County of Los Angeles, California (Figure 1). Specifically, the Project area is located at 1515 Walnut Grove Avenue and situated on Assessor Parcel Number 5279-027-001 (Figure 2). The property is currently bounded by Walnut Grove Avenue to the east, commercial buildings to the north, single-family housing to the west, and institutional uses to the south. The Project will involve the demolition of an existing Southern California Edison building and detached central plant building and will construct 191 townhome dwelling units. Vehicular access provisions for the property would be provided via two full-movement unsignalized driveways along Walnut Grove Avenue. The proposed Opening Year for the Project is 2029. The Project will be developed in a single project phase. 1.2 Regulatory Setting California Environmental Quality Act The California Environmental Quality Act (CEQA) applies to all discretionary projects undertaken or subject to approval by the State’s public agencies (California Code of Regulations [CCR] 14(3), § 15002(i}). Under CEQA, “A project with an effect that may cause a substantial adverse change in the significance of a historical resource is a project that may have a significant effect on the environment” (CCR Tit. 14(3), § 15064.5(b)). Guidelines for Implementation of the California Environmental Quality Act (CEQA Guidelines) Section 15064.5(a) defines a “historical resource” as a resource that meets one or more of the following criteria: e Listed in, or eligible for listing in, the California Register of Historical Resources (California Register or CRHR) e Listed in a local register of historical resources (as defined at Cal. Public Res. Code § 5020.1(k}) e Identified as significant in a historical resource survey meeting the requirements of § 5024.1(g) of the Cal. Public Res. Code September 2025 Kimley»Horn Page | 1 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 1.0 INTRODUCTION Kimley-Horn and Associates, Inc. (Kimley-Horn) conducted an Archaeological Resources Assessment for the 1515 Walnut Grove Avenue Project (Project) located within the City of Rosemead (Lead Agency) in Los Angeles County, California. This study was completed to support the Lead Agency’s review of potential impacts to archaeological resources as a result of the proposed Project. A literature review and records search were conducted for the property to identify the likelihood of present archaeological resources that would be adversely impacted by the Project. Due to the existing built environment and inability to survey for archaeological resources, the assessment did not include archaeological fieldwork. As the scope of this assessment is to identify potential impacts to archaeological resources, historic built environment resources are not addressed in this report. 1.1 Project Description The Project area is located in the south-central portion of the City of Rosemead in the County of Los Angeles, California (Figure 1). Specifically, the Project area is located at 1515 Walnut Grove Avenue and situated on Assessor Parcel Number 5279-027-001 (Figure 2). The property is currently bounded by Walnut Grove Avenue to the east, commercial buildings to the north, single-family housing to the west, and institutional uses to the south. The Project will involve the demolition of an existing Southern California Edison building and detached central plant building and will construct 191 townhome dwelling units. Vehicular access provisions for the property would be provided via two full-movement unsignalized driveways along Walnut Grove Avenue. The proposed Opening Year for the Project is 2029. The Project will be developed in a single project phase. 1.2 Regulatory Setting California Environmental Quality Act The California Environmental Quality Act (CEQA) applies to all discretionary projects undertaken or subject to approval by the State’s public agencies (California Code of Regulations [CCR] 14(3), § 15002(i}). Under CEQA, “A project with an effect that may cause a substantial adverse change in the significance of a historical resource is a project that may have a significant effect on the environment” (CCR Tit. 14(3), § 15064.5(b)). Guidelines for Implementation of the California Environmental Quality Act (CEQA Guidelines) Section 15064.5(a) defines a “historical resource” as a resource that meets one or more of the following criteria: e Listed in, or eligible for listing in, the California Register of Historical Resources (California Register or CRHR) e Listed in a local register of historical resources (as defined at Cal. Public Res. Code § 5020.1(k}) e Identified as significant in a historical resource survey meeting the requirements of § 5024.1(g) of the Cal. Public Res. Code September 2025 Kimley»Horn Page | 1 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 1.0 INTRODUCTION Kimley-Horn and Associates, Inc. (Kimley-Horn) conducted an Archaeological Resources Assessment for the 1515 Walnut Grove Avenue Project (Project) located within the City of Rosemead (Lead Agency) in Los Angeles County, California. This study was completed to support the Lead Agency’s review of potential impacts to archaeological resources as a result of the proposed Project. A literature review and records search were conducted for the property to identify the likelihood of present archaeological resources that would be adversely impacted by the Project. Due to the existing built environment and inability to survey for archaeological resources, the assessment did not include archaeological fieldwork. As the scope of this assessment is to identify potential impacts to archaeological resources, historic built environment resources are not addressed in this report. 1.1 Project Description The Project area is located in the south-central portion of the City of Rosemead in the County of Los Angeles, California (Figure 1). Specifically, the Project area is located at 1515 Walnut Grove Avenue and situated on Assessor Parcel Number 5279-027-001 (Figure 2). The property is currently bounded by Walnut Grove Avenue to the east, commercial buildings to the north, single-family housing to the west, and institutional uses to the south. The Project will involve the demolition of an existing Southern California Edison building and detached central plant building and will construct 191 townhome dwelling units. Vehicular access provisions for the property would be provided via two full-movement unsignalized driveways along Walnut Grove Avenue. The proposed Opening Year for the Project is 2029. The Project will be developed in a single project phase. 1.2 Regulatory Setting California Environmental Quality Act The California Environmental Quality Act (CEQA) applies to all discretionary projects undertaken or subject to approval by the State’s public agencies (California Code of Regulations [CCR] 14(3), § 15002(i}). Under CEQA, “A project with an effect that may cause a substantial adverse change in the significance of a historical resource is a project that may have a significant effect on the environment” (CCR Tit. 14(3), § 15064.5(b)). Guidelines for Implementation of the California Environmental Quality Act (CEQA Guidelines) Section 15064.5(a) defines a “historical resource” as a resource that meets one or more of the following criteria: e Listed in, or eligible for listing in, the California Register of Historical Resources (California Register or CRHR) e Listed in a local register of historical resources (as defined at Cal. Public Res. Code § 5020.1(k}) e Identified as significant in a historical resource survey meeting the requirements of § 5024.1(g) of the Cal. Public Res. Code September 2025 Kimley»Horn Page | 1 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 2 Figure 1: Project Vicinity Map City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment TRIEIney_St _ [EREFER— 3EEN = = =[— o-——JL_Fern'Ave——-F LEL torn= |GabiFIER I ie ;CX 537,South.San- = :SRC STi [1 IASi = 7 ' Ny GolfCaurseIS =SCE dl 1 lie i»NSS faaa— - Whittier Narrows Recreation Area Whittier NarrowsWater Reclamation Pico Riverd Lo A XS of lo asl arate Parks, Esri, TomTom, (Farms= ep =~ EE CalORE KS, LSM, lomIom, arial G [4 SafeGry 05:THEME T1/N AS, &SES; BreaoFGodrsei aif, U hs ifc= deJ = ez RL Vanit’Rea ParkJiri sy) Project Vicinity Map 0 0.25 05 1 1.5 2 . vies [J Project Area Figure 1: Project Vicinity Map September 2025 Kimley»Horn Page | 2 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment TRIEIney_St _ [EREFER— 3EEN = = =[— o-——JL_Fern'Ave——-F LEL torn= |GabiFIER I ie ;CX 537,South.San- = :SRC STi [1 IASi = 7 ' Ny GolfCaurseIS =SCE dl 1 lie i»NSS faaa— - Whittier Narrows Recreation Area Whittier NarrowsWater Reclamation Pico Riverd Lo A XS of lo asl arate Parks, Esri, TomTom, (Farms= ep =~ EE CalORE KS, LSM, lomIom, arial G [4 SafeGry 05:THEME T1/N AS, &SES; BreaoFGodrsei aif, U hs ifc= deJ = ez RL Vanit’Rea ParkJiri sy) Project Vicinity Map 0 0.25 05 1 1.5 2 . vies [J Project Area Figure 1: Project Vicinity Map September 2025 Kimley»Horn Page | 2 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment TRIEIney_St _ [EREFER— 3EEN = = =[— o-——JL_Fern'Ave——-F LEL torn= |GabiFIER I ie ;CX 537,South.San- = :SRC STi [1 IASi = 7 ' Ny GolfCaurseIS =SCE dl 1 lie i»NSS faaa— - Whittier Narrows Recreation Area Whittier NarrowsWater Reclamation Pico Riverd Lo A XS of lo asl arate Parks, Esri, TomTom, (Farms= ep =~ EE CalORE KS, LSM, lomIom, arial G [4 SafeGry 05:THEME T1/N AS, &SES; BreaoFGodrsei aif, U hs ifc= deJ = ez RL Vanit’Rea ParkJiri sy) Project Vicinity Map 0 0.25 05 1 1.5 2 . vies [J Project Area Figure 1: Project Vicinity Map September 2025 Kimley»Horn Page | 2 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 3 Figure 2: Project Area Map City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment Project Area Map 0 375 75 150 225 300 .UsFeet = Project Area Figure 2: Project Area Map September 2025 Kimley»Horn Page | 3 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment Project Area Map 0 375 75 150 225 300 .UsFeet = Project Area Figure 2: Project Area Map September 2025 Kimley»Horn Page | 3 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment Project Area Map 0 375 75 150 225 300 .UsFeet = Project Area Figure 2: Project Area Map September 2025 Kimley»Horn Page | 3 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 4 • Determined to be a historical resource by a project’s lead agency (Cal. Code Regs. Tit. 14(3), § 15064.5(a)) A historical resource consists of “Any object, building, structure, site, area, place, record, or manuscript which a lead agency determines to be historically significant or significant in the architectural, engineering, scientific, economic, agricultural, educational, social, political, military, or cultural annals of California…Generally, a resource shall be considered by the lead agency to be ‘historically significant’ if the resource meets the criteria for listing in the California Register of Historical Resources” (Cal. Code Regs. [CCR] Tit. 14(3), § 15064.5(a)(3)). The significance of a historical resource is impaired when a project demolishes or materially alters in an adverse manner those physical characteristics of a historical resource that convey its historical significance and that justify its eligibility for the California Register. If an impact on a historical or archaeological resource is significant, CEQA requires feasible measures to minimize the impact (CEQA Guidelines § 15126.4 (a)(1)). Mitigation of significant impacts must lessen or eliminate the physical impact that the project will have on the resource. Section 5024.1 of the Cal. Public Res. Code (PRC) established the California Register. Generally, a resource is considered by the lead agency to be “historically significant” if the resource meets the criteria for listing in the California Register (CCR tit. 14(3), § 15064.5(a)(3)). Finally, CEQA requires that significant effects on unique archaeological resources be considered and addressed. CEQA defines a unique archaeological resource as any archaeological artifact, object, or site about which it can be clearly demonstrated that, without merely adding to the current body of knowledge, there is a high probability that it meets any of the following criteria: • Contains information needed to answer important scientific research questions and there is a demonstrable public interest in that information. • Has a special and particular quality such as being the oldest of its type or the best available example of its type. • Is directly associated with a scientifically recognized important prehistoric or historic event or person. CEQA Guidelines Section 15064.5 Appendix G includes significance criteria relative to archaeological and historical resources. These have been utilized as thresholds of significance here, and a project would have a significant environmental impact if it would: • Cause a substantial adverse change in the significance of a historical resource as defined in section 10564.5; • Cause a substantial adverse change in the significance of an archaeological resource pursuant to Section 10564.5; • Disturb any human remains, including those interred outside of formal cemeteries. City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment e Determined to be a historical resource by a project's lead agency (Cal. Code Regs. Tit. 14(3), § 15064.5(a}) A historical resource consists of “Any object, building, structure, site, area, place, record, or manuscript which a lead agency determines to be historically significant or significant in the architectural, engineering, scientific, economic, agricultural, educational, social, political, military, or cultural annals of California...Generally, a resource shall be considered by the lead agency to be ‘historically significant’ if the resource meets the criteria for listing in the California Register of Historical Resources” (Cal. Code Regs. [CCR] Tit. 14(3), § 15064.5(a)(3)). The significance of a historical resource is impaired when a project demolishes or materially alters in an adverse manner those physical characteristics of a historical resource that convey its historical significance and that justify its eligibility for the California Register. If an impact on a historical or archaeological resource is significant, CEQA requires feasible measures to minimize the impact (CEQA Guidelines § 15126.4 (a)(1)). Mitigation of significant impacts must lessen or eliminate the physical impact that the project will have on the resource. Section 5024.1 of the Cal. Public Res. Code (PRC) established the California Register. Generally, a resource is considered by the lead agency to be “historically significant” if the resource meets the criteria for listing in the California Register (CCR tit. 14(3), § 15064.5(a)(3)). Finally, CEQA requires that significant effects on unique archaeological resources be considered and addressed. CEQA defines a unique archaeological resource as any archaeological artifact, object, or site about which it can be clearly demonstrated that, without merely adding to the current body of knowledge, there is a high probability that it meets any of the following criteria: e Contains information needed to answer important scientific research questions and there is a demonstrable public interest in that information. eo Has a special and particular quality such as being the oldest of its type or the best available example of its type. e |s directly associated with a scientifically recognized important prehistoric or historic event or person. CEQA Guidelines Section 15064.5 Appendix G includes significance criteria relative to archaeological and historical resources. These have been utilized as thresholds of significance here, and a project would have a significant environmental impact if it would: e Cause a substantial adverse change in the significance ofa historical resource as defined in section 10564.5; e Cause a substantial adverse change in the significance of an archaeological resource pursuant to Section 10564.5; e Disturb any human remains, including those interred outside of formal cemeteries. September 2025 Kimley»Horn Page | 4 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment e Determined to be a historical resource by a project's lead agency (Cal. Code Regs. Tit. 14(3), § 15064.5(a}) A historical resource consists of “Any object, building, structure, site, area, place, record, or manuscript which a lead agency determines to be historically significant or significant in the architectural, engineering, scientific, economic, agricultural, educational, social, political, military, or cultural annals of California...Generally, a resource shall be considered by the lead agency to be ‘historically significant’ if the resource meets the criteria for listing in the California Register of Historical Resources” (Cal. Code Regs. [CCR] Tit. 14(3), § 15064.5(a)(3)). The significance of a historical resource is impaired when a project demolishes or materially alters in an adverse manner those physical characteristics of a historical resource that convey its historical significance and that justify its eligibility for the California Register. If an impact on a historical or archaeological resource is significant, CEQA requires feasible measures to minimize the impact (CEQA Guidelines § 15126.4 (a)(1)). Mitigation of significant impacts must lessen or eliminate the physical impact that the project will have on the resource. Section 5024.1 of the Cal. Public Res. Code (PRC) established the California Register. Generally, a resource is considered by the lead agency to be “historically significant” if the resource meets the criteria for listing in the California Register (CCR tit. 14(3), § 15064.5(a)(3)). Finally, CEQA requires that significant effects on unique archaeological resources be considered and addressed. CEQA defines a unique archaeological resource as any archaeological artifact, object, or site about which it can be clearly demonstrated that, without merely adding to the current body of knowledge, there is a high probability that it meets any of the following criteria: e Contains information needed to answer important scientific research questions and there is a demonstrable public interest in that information. eo Has a special and particular quality such as being the oldest of its type or the best available example of its type. e |s directly associated with a scientifically recognized important prehistoric or historic event or person. CEQA Guidelines Section 15064.5 Appendix G includes significance criteria relative to archaeological and historical resources. These have been utilized as thresholds of significance here, and a project would have a significant environmental impact if it would: e Cause a substantial adverse change in the significance ofa historical resource as defined in section 10564.5; e Cause a substantial adverse change in the significance of an archaeological resource pursuant to Section 10564.5; e Disturb any human remains, including those interred outside of formal cemeteries. September 2025 Kimley»Horn Page | 4 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment e Determined to be a historical resource by a project's lead agency (Cal. Code Regs. Tit. 14(3), § 15064.5(a}) A historical resource consists of “Any object, building, structure, site, area, place, record, or manuscript which a lead agency determines to be historically significant or significant in the architectural, engineering, scientific, economic, agricultural, educational, social, political, military, or cultural annals of California...Generally, a resource shall be considered by the lead agency to be ‘historically significant’ if the resource meets the criteria for listing in the California Register of Historical Resources” (Cal. Code Regs. [CCR] Tit. 14(3), § 15064.5(a)(3)). The significance of a historical resource is impaired when a project demolishes or materially alters in an adverse manner those physical characteristics of a historical resource that convey its historical significance and that justify its eligibility for the California Register. If an impact on a historical or archaeological resource is significant, CEQA requires feasible measures to minimize the impact (CEQA Guidelines § 15126.4 (a)(1)). Mitigation of significant impacts must lessen or eliminate the physical impact that the project will have on the resource. Section 5024.1 of the Cal. Public Res. Code (PRC) established the California Register. Generally, a resource is considered by the lead agency to be “historically significant” if the resource meets the criteria for listing in the California Register (CCR tit. 14(3), § 15064.5(a)(3)). Finally, CEQA requires that significant effects on unique archaeological resources be considered and addressed. CEQA defines a unique archaeological resource as any archaeological artifact, object, or site about which it can be clearly demonstrated that, without merely adding to the current body of knowledge, there is a high probability that it meets any of the following criteria: e Contains information needed to answer important scientific research questions and there is a demonstrable public interest in that information. eo Has a special and particular quality such as being the oldest of its type or the best available example of its type. e |s directly associated with a scientifically recognized important prehistoric or historic event or person. CEQA Guidelines Section 15064.5 Appendix G includes significance criteria relative to archaeological and historical resources. These have been utilized as thresholds of significance here, and a project would have a significant environmental impact if it would: e Cause a substantial adverse change in the significance ofa historical resource as defined in section 10564.5; e Cause a substantial adverse change in the significance of an archaeological resource pursuant to Section 10564.5; e Disturb any human remains, including those interred outside of formal cemeteries. September 2025 Kimley»Horn Page | 4 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 5 California Public Resources Code California PRC § 5024.1 establishes the CRHR. The register lists all California properties considered to be significant historical resources. The CRHR also includes all properties listed or determined eligible for listing in the National Register of Historic Places (NRHP), including properties evaluated and determined eligible under § 106. PRC § 5020 to 5029.5 continued the former Historical Landmarks Advisory Committee as the State Historical Resources Commission. The commission oversees the administration of the CRHR and is responsible for designating State Historical Landmarks and Historical Points of Interest. PRC § 5079 to 5079.65 define the functions and duties of the Office of Historic Preservation, which administers federal- and State-mandated historic preservation programs in California as well as the California Heritage Fund. PRC § 5097.9 to 5097.991 provide protection to Native American historical and cultural resources and sacred sites; identify the powers and duties of the Native American Heritage Commission (NAHC); require that descendants be notified when Native American human remains are discovered; and provide for treatment and disposition of human remains and associated grave goods. California Health and Safety Code California Health and Safety Code § 7050.5-7055 govern the process for reporting inadvertent discoveries of human remains to the County Coroner; the process for the County Coroner to report human remains of Native American descent to the NAHC; and the protections offered against removal or desecration of human remains. California Code of Regulations The CCR governs the nomination of resources to the CRHR (14 CCR § 4850). The regulations set forth the criteria for eligibility as well as guidelines for assessing historical integrity and resources that have special considerations. California Register of Historical Resources The State Historical Resources Commission has designed this program for use by state and local agencies, private groups, and citizens to identify, evaluate, register, and protect California’s historical resources. The CRHR is the authoritative guide to the State’s significant historical and archeological resources. The CRHR program encourages public recognition and protection of resources of architectural, historical, archeological, and cultural significance; identifies historical resources for state and local planning purposes; determines eligibility for State historic preservation grant funding; and affords certain protections under CEQA. To be eligible for listing in the CRHR, a resource must meet at least one of the following criteria: • Is associated with events that have made a significant contribution to the broad patterns of local or regional history or the cultural heritage of California or the United States. City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment California Public Resources Code California PRC § 5024.1 establishes the CRHR. The register lists all California properties considered to be significant historical resources. The CRHR also includes all properties listed or determined eligible for listing in the National Register of Historic Places (NRHP), including properties evaluated and determined eligible under § 106. PRC § 5020 to 5029.5 continued the former Historical Landmarks Advisory Committee as the State Historical Resources Commission. The commission oversees the administration of the CRHR and is responsible for designating State Historical Landmarks and Historical Points of Interest. PRC § 5079 to 5079.65 define the functions and duties of the Office of Historic Preservation, which administers federal- and State-mandated historic preservation programs in California as well as the California Heritage Fund. PRC § 5097.9 to 5097.991 provide protection to Native American historical and cultural resources and sacred sites; identify the powers and duties of the Native American Heritage Commission (NAHC); require that descendants be notified when Native American human remains are discovered; and provide for treatment and disposition of human remains and associated grave goods. California Health and Safety Code California Health and Safety Code § 7050.5-7055 govern the process for reporting inadvertent discoveries of human remains to the County Coroner; the process for the County Coroner to report human remains of Native American descent to the NAHC; and the protections offered against removal or desecration of human remains. California Code of Regulations The CCR governs the nomination of resources to the CRHR {14 CCR § 4850). The regulations set forth the criteria for eligibility as well as guidelines for assessing historical integrity and resources that have special considerations. California Register of Historical Resources The State Historical Resources Commission has designed this program for use by state and local agencies, private groups, and citizens to identify, evaluate, register, and protect California’s historical resources. The CRHR is the authoritative guide to the State’s significant historical and archeological resources. The CRHR program encourages public recognition and protection of resources of architectural, historical, archeological, and cultural significance; identifies historical resources for state and local planning purposes; determines eligibility for State historic preservation grant funding; and affords certain protections under CEQA. To be eligible for listing in the CRHR, a resource must meet at least one of the following criteria: e |s associated with events that have made a significant contribution to the broad patterns of local or regional history or the cultural heritage of California or the United States. September 2025 Kimley»Horn Page | 5 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment California Public Resources Code California PRC § 5024.1 establishes the CRHR. The register lists all California properties considered to be significant historical resources. The CRHR also includes all properties listed or determined eligible for listing in the National Register of Historic Places (NRHP), including properties evaluated and determined eligible under § 106. PRC § 5020 to 5029.5 continued the former Historical Landmarks Advisory Committee as the State Historical Resources Commission. The commission oversees the administration of the CRHR and is responsible for designating State Historical Landmarks and Historical Points of Interest. PRC § 5079 to 5079.65 define the functions and duties of the Office of Historic Preservation, which administers federal- and State-mandated historic preservation programs in California as well as the California Heritage Fund. PRC § 5097.9 to 5097.991 provide protection to Native American historical and cultural resources and sacred sites; identify the powers and duties of the Native American Heritage Commission (NAHC); require that descendants be notified when Native American human remains are discovered; and provide for treatment and disposition of human remains and associated grave goods. California Health and Safety Code California Health and Safety Code § 7050.5-7055 govern the process for reporting inadvertent discoveries of human remains to the County Coroner; the process for the County Coroner to report human remains of Native American descent to the NAHC; and the protections offered against removal or desecration of human remains. California Code of Regulations The CCR governs the nomination of resources to the CRHR {14 CCR § 4850). The regulations set forth the criteria for eligibility as well as guidelines for assessing historical integrity and resources that have special considerations. California Register of Historical Resources The State Historical Resources Commission has designed this program for use by state and local agencies, private groups, and citizens to identify, evaluate, register, and protect California’s historical resources. The CRHR is the authoritative guide to the State’s significant historical and archeological resources. The CRHR program encourages public recognition and protection of resources of architectural, historical, archeological, and cultural significance; identifies historical resources for state and local planning purposes; determines eligibility for State historic preservation grant funding; and affords certain protections under CEQA. To be eligible for listing in the CRHR, a resource must meet at least one of the following criteria: e |s associated with events that have made a significant contribution to the broad patterns of local or regional history or the cultural heritage of California or the United States. September 2025 Kimley»Horn Page | 5 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment California Public Resources Code California PRC § 5024.1 establishes the CRHR. The register lists all California properties considered to be significant historical resources. The CRHR also includes all properties listed or determined eligible for listing in the National Register of Historic Places (NRHP), including properties evaluated and determined eligible under § 106. PRC § 5020 to 5029.5 continued the former Historical Landmarks Advisory Committee as the State Historical Resources Commission. The commission oversees the administration of the CRHR and is responsible for designating State Historical Landmarks and Historical Points of Interest. PRC § 5079 to 5079.65 define the functions and duties of the Office of Historic Preservation, which administers federal- and State-mandated historic preservation programs in California as well as the California Heritage Fund. PRC § 5097.9 to 5097.991 provide protection to Native American historical and cultural resources and sacred sites; identify the powers and duties of the Native American Heritage Commission (NAHC); require that descendants be notified when Native American human remains are discovered; and provide for treatment and disposition of human remains and associated grave goods. California Health and Safety Code California Health and Safety Code § 7050.5-7055 govern the process for reporting inadvertent discoveries of human remains to the County Coroner; the process for the County Coroner to report human remains of Native American descent to the NAHC; and the protections offered against removal or desecration of human remains. California Code of Regulations The CCR governs the nomination of resources to the CRHR {14 CCR § 4850). The regulations set forth the criteria for eligibility as well as guidelines for assessing historical integrity and resources that have special considerations. California Register of Historical Resources The State Historical Resources Commission has designed this program for use by state and local agencies, private groups, and citizens to identify, evaluate, register, and protect California’s historical resources. The CRHR is the authoritative guide to the State’s significant historical and archeological resources. The CRHR program encourages public recognition and protection of resources of architectural, historical, archeological, and cultural significance; identifies historical resources for state and local planning purposes; determines eligibility for State historic preservation grant funding; and affords certain protections under CEQA. To be eligible for listing in the CRHR, a resource must meet at least one of the following criteria: e |s associated with events that have made a significant contribution to the broad patterns of local or regional history or the cultural heritage of California or the United States. September 2025 Kimley»Horn Page | 5 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 6 • Is associated with the lives of persons important to local, California, or national history. • Embodies the distinctive characteristics of a type, period, region, or method of construction; represents the work of a master; or possesses high artistic values. • Has yielded, or has the potential to yield, information important to the prehistory or history of the local area, California or the nation. In addition to having significance, resources must have integrity for the period of significance. The period of significance is the date or span of time within which significant events transpired or significant individuals made their important contributions. Integrity is the authenticity of a historical resource’s physical identity as evidenced by the survival of characteristics or historic fabric that existed during the resource’s period of significance. Alterations to a resource or changes in its use over time may change its historical, cultural, or architectural significance. Simply, resources must retain enough of their historic character or appearance to be recognizable as historical resources and to convey the reasons for their significance. A resource that has lost its historic character or appearance may still have sufficient integrity for the CRHR if, under Criterion 4, it maintains the potential to yield significant scientific or historical information or specific data. Isolated finds, such as a single artifact with no other associated cultural materials, are generally considered to be ineligible for listing in the CRHR. However, the nature of the isolated resource and any available ethnographic data regarding affiliated Native American populations should be carefully considered during the evaluation process, particularly as it relates to potential eligibility under Criterion 4. California Historical Landmarks California Historical Landmarks are buildings, structures, sites, or places that have been determined to have statewide historical significance. The resource must be approved for designation by the County Board of Supervisors or the City/Town Council in whose jurisdiction it is located; be recommended by the State Historical Resources Commission; and be officially designated by the Director of California State Parks. A resource must meet at least one of these following criteria: • Be the first, last, only, or most significant of its type in the state or within a large geographic region (Northern, Central, or Southern California). • Be associated with an individual or group having a profound influence on the history of California. • Be a prototype of, or an outstanding example of, a period, style, architectural movement or construction or is one of the more notable works or the best surviving work in a region of a pioneer architect, designer, or master builder. California Points of Historical Interest California Points of Historical Interest are sites, buildings, features, or events that are of local (city or county) significance and have anthropological, cultural, military, political, architectural, economic, scientific or technical, religious, experimental, or other value. Points of Historical Interest designated after December 1997 and recommended by the State Historical Resources Commission are also listed in the City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment e |s associated with the lives of persons important to local, California, or national history. eo Embodies the distinctive characteristics of a type, period, region, or method of construction; represents the work of a master; or possesses high artistic values. e Has yielded, or has the potential to yield, information important to the prehistory or history of the local area, California or the nation. In addition to having significance, resources must have integrity for the period of significance. The period of significance is the date or span of time within which significant events transpired or significant individuals made their important contributions. Integrity is the authenticity of a historical resource’s physical identity as evidenced by the survival of characteristics or historic fabric that existed during the resource’s period of significance. Alterations to a resource or changes in its use over time may change its historical, cultural, or architectural significance. Simply, resources must retain enough of their historic character or appearance to be recognizable as historical resources and to convey the reasons for their significance. A resource that has lost its historic character or appearance may still have sufficient integrity for the CRHR if, under Criterion 4, it maintains the potential to yield significant scientific or historical information or specific data. Isolated finds, such as a single artifact with no other associated cultural materials, are generally considered to be ineligible for listing in the CRHR. However, the nature of the isolated resource and any available ethnographic data regarding affiliated Native American populations should be carefully considered during the evaluation process, particularly as it relates to potential eligibility under Criterion 4. California Historical Landmarks California Historical Landmarks are buildings, structures, sites, or places that have been determined to have statewide historical significance. The resource must be approved for designation by the County Board of Supervisors or the City/Town Council in whose jurisdiction it is located; be recommended by the State Historical Resources Commission; and be officially designated by the Director of California State Parks. A resource must meet at least one of these following criteria: eo Be the first, last, only, or most significant of its type in the state or within a large geographic region (Northern, Central, or Southern California). e Be associated with an individual or group having a profound influence on the history of California. eo Be a prototype of, or an outstanding example of, a period, style, architectural movement or construction or is one of the more notable works or the best surviving work in a region of a pioneer architect, designer, or master builder. California Points of Historical Interest California Points of Historical Interest are sites, buildings, features, or events that are of local (city or county} significance and have anthropological, cultural, military, political, architectural, economic, scientific or technical, religious, experimental, or other value. Points of Historical Interest designated after December 1997 and recommended by the State Historical Resources Commission are also listed in the September 2025 Kimley»Horn Page | 6 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment e |s associated with the lives of persons important to local, California, or national history. eo Embodies the distinctive characteristics of a type, period, region, or method of construction; represents the work of a master; or possesses high artistic values. e Has yielded, or has the potential to yield, information important to the prehistory or history of the local area, California or the nation. In addition to having significance, resources must have integrity for the period of significance. The period of significance is the date or span of time within which significant events transpired or significant individuals made their important contributions. Integrity is the authenticity of a historical resource’s physical identity as evidenced by the survival of characteristics or historic fabric that existed during the resource’s period of significance. Alterations to a resource or changes in its use over time may change its historical, cultural, or architectural significance. Simply, resources must retain enough of their historic character or appearance to be recognizable as historical resources and to convey the reasons for their significance. A resource that has lost its historic character or appearance may still have sufficient integrity for the CRHR if, under Criterion 4, it maintains the potential to yield significant scientific or historical information or specific data. Isolated finds, such as a single artifact with no other associated cultural materials, are generally considered to be ineligible for listing in the CRHR. However, the nature of the isolated resource and any available ethnographic data regarding affiliated Native American populations should be carefully considered during the evaluation process, particularly as it relates to potential eligibility under Criterion 4. California Historical Landmarks California Historical Landmarks are buildings, structures, sites, or places that have been determined to have statewide historical significance. The resource must be approved for designation by the County Board of Supervisors or the City/Town Council in whose jurisdiction it is located; be recommended by the State Historical Resources Commission; and be officially designated by the Director of California State Parks. A resource must meet at least one of these following criteria: eo Be the first, last, only, or most significant of its type in the state or within a large geographic region (Northern, Central, or Southern California). e Be associated with an individual or group having a profound influence on the history of California. eo Be a prototype of, or an outstanding example of, a period, style, architectural movement or construction or is one of the more notable works or the best surviving work in a region of a pioneer architect, designer, or master builder. California Points of Historical Interest California Points of Historical Interest are sites, buildings, features, or events that are of local (city or county} significance and have anthropological, cultural, military, political, architectural, economic, scientific or technical, religious, experimental, or other value. Points of Historical Interest designated after December 1997 and recommended by the State Historical Resources Commission are also listed in the September 2025 Kimley»Horn Page | 6 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment e |s associated with the lives of persons important to local, California, or national history. eo Embodies the distinctive characteristics of a type, period, region, or method of construction; represents the work of a master; or possesses high artistic values. e Has yielded, or has the potential to yield, information important to the prehistory or history of the local area, California or the nation. In addition to having significance, resources must have integrity for the period of significance. The period of significance is the date or span of time within which significant events transpired or significant individuals made their important contributions. Integrity is the authenticity of a historical resource’s physical identity as evidenced by the survival of characteristics or historic fabric that existed during the resource’s period of significance. Alterations to a resource or changes in its use over time may change its historical, cultural, or architectural significance. Simply, resources must retain enough of their historic character or appearance to be recognizable as historical resources and to convey the reasons for their significance. A resource that has lost its historic character or appearance may still have sufficient integrity for the CRHR if, under Criterion 4, it maintains the potential to yield significant scientific or historical information or specific data. Isolated finds, such as a single artifact with no other associated cultural materials, are generally considered to be ineligible for listing in the CRHR. However, the nature of the isolated resource and any available ethnographic data regarding affiliated Native American populations should be carefully considered during the evaluation process, particularly as it relates to potential eligibility under Criterion 4. California Historical Landmarks California Historical Landmarks are buildings, structures, sites, or places that have been determined to have statewide historical significance. The resource must be approved for designation by the County Board of Supervisors or the City/Town Council in whose jurisdiction it is located; be recommended by the State Historical Resources Commission; and be officially designated by the Director of California State Parks. A resource must meet at least one of these following criteria: eo Be the first, last, only, or most significant of its type in the state or within a large geographic region (Northern, Central, or Southern California). e Be associated with an individual or group having a profound influence on the history of California. eo Be a prototype of, or an outstanding example of, a period, style, architectural movement or construction or is one of the more notable works or the best surviving work in a region of a pioneer architect, designer, or master builder. California Points of Historical Interest California Points of Historical Interest are sites, buildings, features, or events that are of local (city or county} significance and have anthropological, cultural, military, political, architectural, economic, scientific or technical, religious, experimental, or other value. Points of Historical Interest designated after December 1997 and recommended by the State Historical Resources Commission are also listed in the September 2025 Kimley»Horn Page | 6 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 7 CRHR. No historical resource may be designated as both a landmark and a point. If a point is subsequently granted status as a landmark, the point designation is retired. To be eligible for designation as a Point of Historical Interest, a resource must meet at least one of the following criteria: • Be the first, last, only, or most significant of its type within the local geographic region (city or county). • Be associated with an individual or group having a profound influence on the history of the local area. • Be a prototype of, or an outstanding example of, a period, style, architectural movement or construction or be one of the more notable works or the best surviving work in the local region of a pioneer architect, designer or master builder. 2.0 METHODS This report was prepared pursuant to CEQA. This study identifies whether any archaeological resources were previously recorded within the Project area, the potential for unrecorded archaeological resources, and whether any present archaeological resources are potentially significant under the above-referenced regulations. Tasks completed include: • An archaeological resource record search with the South Central Coastal Information Center (SCCIC) for the Project area and half-mile radius, • Sacred Lands File (SLF) search through the NAHC, • Review of geological and historical maps and imagery to identify the archaeological resource sensitivity of the Project area, • Recommendations regarding any identified or potential archaeological resources. 3.0 PROJECT SETTING 3.1 Natural Setting The Project is situated in an urban environment within the San Gabriel Valley. The San Gabriel Valley ranges around 400 square miles and spans from the San Gabriel Mountains (north), Los Angeles (west), Pomona (east), and Orange County (south) (Cheng 2014). This area has an elevation between 200 to 900 feet above mean sea level (amsl) (USDA 2025). The Project area is situated along the East Montebello fault line (U.S. Geological Survey 2025). The soil composition of the Project area consists of Urban land-Pico- Metz complex with the underlain soil considered to be Holocene-age loam from an alluvial fan (SoilWeb 2025; Tan 2000). The Alhambra Wash runs in a southeasterly direction immediately north of the Project (Figure 3). However, the Project area is currently developed with no native soil visible on the surface. City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment CRHR. No historical resource may be designated as both a landmark and a point. If a point is subsequently granted status as a landmark, the point designation is retired. To be eligible for designation as a Point of Historical Interest, a resource must meet at least one of the following criteria: e Be the first, last, only, or most significant of its type within the local geographic region (city or county). e Be associated with an individual or group having a profound influence on the history of the local area. eo Be a prototype of, or an outstanding example of, a period, style, architectural movement or construction or be one of the more notable works or the best surviving work in the local region of a pioneer architect, designer or master builder. 2.0 METHODS This report was prepared pursuant to CEQA. This study identifies whether any archaeological resources were previously recorded within the Project area, the potential for unrecorded archaeological resources, and whether any present archaeological resources are potentially significant under the above-referenced regulations. Tasks completed include: eo An archaeological resource record search with the South Central Coastal Information Center (SCCIC) for the Project area and half-mile radius, e Sacred Lands File (SLF) search through the NAHC, eo Review of geological and historical maps and imagery to identify the archaeological resource sensitivity of the Project area, e Recommendations regarding any identified or potential archaeological resources. 3.0 PROJECT SETTING 3.1 Natural Setting The Project is situated in an urban environment within the San Gabriel Valley. The San Gabriel Valley ranges around 400 square miles and spans from the San Gabriel Mountains (north), Los Angeles (west), Pomona (east), and Orange County (south) (Cheng 2014). This area has an elevation between 200 to 900 feet above mean sea level (amsl) (USDA 2025). The Project area is situated along the East Montebello fault line (U.S. Geological Survey 2025). The soil composition of the Project area consists of Urban land-Pico- Metz complex with the underlain soil considered to be Holocene-age loam from an alluvial fan (SoilWeb 2025; Tan 2000). The Alhambra Wash runs in a southeasterly direction immediately north of the Project (Figure 3). However, the Project area is currently developed with no native soil visible on the surface. September 2025 Kimley»Horn Page | 7 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment CRHR. No historical resource may be designated as both a landmark and a point. If a point is subsequently granted status as a landmark, the point designation is retired. To be eligible for designation as a Point of Historical Interest, a resource must meet at least one of the following criteria: e Be the first, last, only, or most significant of its type within the local geographic region (city or county). e Be associated with an individual or group having a profound influence on the history of the local area. eo Be a prototype of, or an outstanding example of, a period, style, architectural movement or construction or be one of the more notable works or the best surviving work in the local region of a pioneer architect, designer or master builder. 2.0 METHODS This report was prepared pursuant to CEQA. This study identifies whether any archaeological resources were previously recorded within the Project area, the potential for unrecorded archaeological resources, and whether any present archaeological resources are potentially significant under the above-referenced regulations. Tasks completed include: eo An archaeological resource record search with the South Central Coastal Information Center (SCCIC) for the Project area and half-mile radius, e Sacred Lands File (SLF) search through the NAHC, eo Review of geological and historical maps and imagery to identify the archaeological resource sensitivity of the Project area, e Recommendations regarding any identified or potential archaeological resources. 3.0 PROJECT SETTING 3.1 Natural Setting The Project is situated in an urban environment within the San Gabriel Valley. The San Gabriel Valley ranges around 400 square miles and spans from the San Gabriel Mountains (north), Los Angeles (west), Pomona (east), and Orange County (south) (Cheng 2014). This area has an elevation between 200 to 900 feet above mean sea level (amsl) (USDA 2025). The Project area is situated along the East Montebello fault line (U.S. Geological Survey 2025). The soil composition of the Project area consists of Urban land-Pico- Metz complex with the underlain soil considered to be Holocene-age loam from an alluvial fan (SoilWeb 2025; Tan 2000). The Alhambra Wash runs in a southeasterly direction immediately north of the Project (Figure 3). However, the Project area is currently developed with no native soil visible on the surface. September 2025 Kimley»Horn Page | 7 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment CRHR. No historical resource may be designated as both a landmark and a point. If a point is subsequently granted status as a landmark, the point designation is retired. To be eligible for designation as a Point of Historical Interest, a resource must meet at least one of the following criteria: e Be the first, last, only, or most significant of its type within the local geographic region (city or county). e Be associated with an individual or group having a profound influence on the history of the local area. eo Be a prototype of, or an outstanding example of, a period, style, architectural movement or construction or be one of the more notable works or the best surviving work in the local region of a pioneer architect, designer or master builder. 2.0 METHODS This report was prepared pursuant to CEQA. This study identifies whether any archaeological resources were previously recorded within the Project area, the potential for unrecorded archaeological resources, and whether any present archaeological resources are potentially significant under the above-referenced regulations. Tasks completed include: eo An archaeological resource record search with the South Central Coastal Information Center (SCCIC) for the Project area and half-mile radius, e Sacred Lands File (SLF) search through the NAHC, eo Review of geological and historical maps and imagery to identify the archaeological resource sensitivity of the Project area, e Recommendations regarding any identified or potential archaeological resources. 3.0 PROJECT SETTING 3.1 Natural Setting The Project is situated in an urban environment within the San Gabriel Valley. The San Gabriel Valley ranges around 400 square miles and spans from the San Gabriel Mountains (north), Los Angeles (west), Pomona (east), and Orange County (south) (Cheng 2014). This area has an elevation between 200 to 900 feet above mean sea level (amsl) (USDA 2025). The Project area is situated along the East Montebello fault line (U.S. Geological Survey 2025). The soil composition of the Project area consists of Urban land-Pico- Metz complex with the underlain soil considered to be Holocene-age loam from an alluvial fan (SoilWeb 2025; Tan 2000). The Alhambra Wash runs in a southeasterly direction immediately north of the Project (Figure 3). However, the Project area is currently developed with no native soil visible on the surface. September 2025 Kimley»Horn Page | 7 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 8 Figure 3: Geologic Map of the Project Area (Indicated with Red Star) 3.2 Ethnographic Setting The Project area is located in the ancestral lands of the Gabrieleño/Tongva. Although Alfred Kroeber recorded the territories of southern California tribes in 1925, the ancient territorial borders remain inexact for two reasons. First, territorial boundaries were flexible. Secondly, indigenous borders and land use were not recorded until after European settlements displaced many Native American communities. Although firm and defining borders cannot be known, archaeological, ethnographic, and historic evidence exists to support the conclusion that the Project area is located within a large geographic area inhabited by the Gabrieleño/Tongva (Kroeber 1925). The Gabrieleño/Tongva have a rich and diverse material culture, traditionally including shell set in asphaltum, carvings, painting, baskets, an extensive steatite industry, and a wide range of stone, shell, and bone materials. At the time of European colonization, they inhabited numerous permanent villages in fertile lowlands along waterways in sheltered areas along the coast, each of which held a population in the low hundreds. Smaller villages were also located at varying distances from these permanent villages, all of which were highly connected via economic, religious, and social ties (Bean and Smith 1978). Villages contained circular and domed homes made of tule mats, fern, or carrizo, as well as small, circular earth- covered sweathouses (Bean and Smith 1978; Kroeber 1925). Their hunting and gathering subsistence strategy included land and offshore efforts that resulted in the take of both small and large land animals, sea mammals, river and ocean fish, and a variety of plant resources. The population sometimes migrated between villages on a temporary basis throughout the year, returning to their permanent villages for ceremony or when resources were needed (Hudson and Blackburn 1982). City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment iCxSivos1 fl15.45 y w NX Poi OV wai. 35 ; ng FR 3 5 J Sak id Hr Ny IN h oS \= = Cara ay CREASY, ON Figure 3: Geologic Map of the Project Area (Indicated with Red Star) 3.2 Ethnographic Setting The Project area is located in the ancestral lands of the Gabrielefio/Tongva. Although Alfred Kroeber recorded the territories of southern California tribes in 1925, the ancient territorial borders remain inexact for two reasons. First, territorial boundaries were flexible. Secondly, indigenous borders and land use were not recorded until after European settlements displaced many Native American communities. Although firm and defining borders cannot be known, archaeological, ethnographic, and historic evidence exists to support the conclusion that the Project area is located within a large geographic area inhabited by the Gabrielefio/Tongva (Kroeber 1925). The Gabrielefio/Tongva have a rich and diverse material culture, traditionally including shell set in asphaltum, carvings, painting, baskets, an extensive steatite industry, and a wide range of stone, shell, and bone materials. At the time of European colonization, they inhabited numerous permanent villages in fertile lowlands along waterways in sheltered areas along the coast, each of which held a population in the low hundreds. Smaller villages were also located at varying distances from these permanent villages, all of which were highly connected via economic, religious, and social ties (Bean and Smith 1978). Villages contained circular and domed homes made of tule mats, fern, or carrizo, as well as small, circular earth- covered sweathouses (Bean and Smith 1978; Kroeber 1925). Their hunting and gathering subsistence strategy included land and offshore efforts that resulted in the take of both small and large land animals, sea mammals, river and ocean fish, and a variety of plant resources. The population sometimes migrated between villages on a temporary basis throughout the year, returning to their permanent villages for ceremony or when resources were needed (Hudson and Blackburn 1982). September 2025 Kimley»Horn Page | 8 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment iCxSivos1 fl15.45 y w NX Poi OV wai. 35 ; ng FR 3 5 J Sak id Hr Ny IN h oS \= = Cara ay CREASY, ON Figure 3: Geologic Map of the Project Area (Indicated with Red Star) 3.2 Ethnographic Setting The Project area is located in the ancestral lands of the Gabrielefio/Tongva. Although Alfred Kroeber recorded the territories of southern California tribes in 1925, the ancient territorial borders remain inexact for two reasons. First, territorial boundaries were flexible. Secondly, indigenous borders and land use were not recorded until after European settlements displaced many Native American communities. Although firm and defining borders cannot be known, archaeological, ethnographic, and historic evidence exists to support the conclusion that the Project area is located within a large geographic area inhabited by the Gabrielefio/Tongva (Kroeber 1925). The Gabrielefio/Tongva have a rich and diverse material culture, traditionally including shell set in asphaltum, carvings, painting, baskets, an extensive steatite industry, and a wide range of stone, shell, and bone materials. At the time of European colonization, they inhabited numerous permanent villages in fertile lowlands along waterways in sheltered areas along the coast, each of which held a population in the low hundreds. Smaller villages were also located at varying distances from these permanent villages, all of which were highly connected via economic, religious, and social ties (Bean and Smith 1978). Villages contained circular and domed homes made of tule mats, fern, or carrizo, as well as small, circular earth- covered sweathouses (Bean and Smith 1978; Kroeber 1925). Their hunting and gathering subsistence strategy included land and offshore efforts that resulted in the take of both small and large land animals, sea mammals, river and ocean fish, and a variety of plant resources. The population sometimes migrated between villages on a temporary basis throughout the year, returning to their permanent villages for ceremony or when resources were needed (Hudson and Blackburn 1982). September 2025 Kimley»Horn Page | 8 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment iCxSivos1 fl15.45 y w NX Poi OV wai. 35 ; ng FR 3 5 J Sak id Hr Ny IN h oS \= = Cara ay CREASY, ON Figure 3: Geologic Map of the Project Area (Indicated with Red Star) 3.2 Ethnographic Setting The Project area is located in the ancestral lands of the Gabrielefio/Tongva. Although Alfred Kroeber recorded the territories of southern California tribes in 1925, the ancient territorial borders remain inexact for two reasons. First, territorial boundaries were flexible. Secondly, indigenous borders and land use were not recorded until after European settlements displaced many Native American communities. Although firm and defining borders cannot be known, archaeological, ethnographic, and historic evidence exists to support the conclusion that the Project area is located within a large geographic area inhabited by the Gabrielefio/Tongva (Kroeber 1925). The Gabrielefio/Tongva have a rich and diverse material culture, traditionally including shell set in asphaltum, carvings, painting, baskets, an extensive steatite industry, and a wide range of stone, shell, and bone materials. At the time of European colonization, they inhabited numerous permanent villages in fertile lowlands along waterways in sheltered areas along the coast, each of which held a population in the low hundreds. Smaller villages were also located at varying distances from these permanent villages, all of which were highly connected via economic, religious, and social ties (Bean and Smith 1978). Villages contained circular and domed homes made of tule mats, fern, or carrizo, as well as small, circular earth- covered sweathouses (Bean and Smith 1978; Kroeber 1925). Their hunting and gathering subsistence strategy included land and offshore efforts that resulted in the take of both small and large land animals, sea mammals, river and ocean fish, and a variety of plant resources. The population sometimes migrated between villages on a temporary basis throughout the year, returning to their permanent villages for ceremony or when resources were needed (Hudson and Blackburn 1982). September 2025 Kimley»Horn Page | 8 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 9 Records show that the long history of European colonization and harmful displacement of Native Americans began in 1542 as a result of Juan Rodríguez Cabrillo visiting the area. Following many subsequent Spanish visits to the region, the colonization of the indigenous population continued alongside the establishment of Missions San Gabriel in 1771 and San Fernando in 1797. Due in part to the introduction of new diseases, as well as the harsh conditions of mission life, the indigenous population quickly dwindled and cultural practices were lost. Following the secularization of the missions, most surviving Gabrieleño/Tongva became wage laborers on the ranchos of Mexican California and were later nearly wiped out as a result of a smallpox outbreak in the 1860s. The combination of removal, murder, disease, forced labor, and poor diet contributed to the harmful diaspora of the Gabrieleño/Tongva from established villages to scattered areas of the Los Angeles Basin for survival (Bean and Smith 1978). This history of displacement within their own ancestral lands has led to difficulty in attaining federal recognition. However, the 20th century found a revitalization of the Gabrieleño/Tongva people and culture, and though the communities remain unrecognized by the Federal government, they remain a very active people in the Los Angeles Basin today. 3.3 Prehistoric Setting Cultural theoretic frameworks for southern California archaeology are frequently debated and refined by archaeologists. The early models proposed by Wallace (1955, 1978) and Warren (1968) continue to be incorporated into cultural studies with revisions. Archaeologists have developed the cultural frameworks in southern California by generally relying on relative dating methods using diagnostic artifacts as opposed to absolute dating due to a lack of chronometric data available in the regional record. The framework proposed by Wallace introduced the Early Period, Millingstone Period, Intermediate Period, and Late Prehistoric Period, which follows the geologic time scale of Early, Middle and Late Holocene. Early Holocene (10,000-7500 calibrated years Before Present (cal BP)) A gradual warming of the environment occurred during the Early Holocene. Researchers have proposed that groups from the Early Holocene were highly mobile and traveled across wide ranges. Cultural resources were portable or expedient to accommodate mobility. Archaeologists have recorded artifacts associated with hunting and plant processing at early Holocene sites, such as projectile points, bifaces, and groundstone tools. Middle Holocene (7500-3500 cal BP) The Millingstone Period during the Middle Holocene is characterized by new artifact types. The warming of the environment resulted in adaptations to changing environments and associated plant and animal resources. Temporary and seasonal camps were utilized during the Middle Holocene. Tools were intentionally cached, which indicate an intent to return to specific sites over time. Diagnostic artifacts have been recorded at Middle Holocene sites, such as Pinto and Silver Lake projectile points. Late Holocene (3500 cal BP through Historic Contact) Archaeological sites from the Late Holocene contain increasingly diverse artifact assemblages. Increased population is evident and multiple family groups likely coexisted within the communities. Proximity to City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment Records show that the long history of European colonization and harmful displacement of Native Americans began in 1542 as a result of Juan Rodriguez Cabrillo visiting the area. Following many subsequent Spanish visits to the region, the colonization of the indigenous population continued alongside the establishment of Missions San Gabriel in 1771 and San Fernando in 1797. Due in part to the introduction of new diseases, as well as the harsh conditions of mission life, the indigenous population quickly dwindled and cultural practices were lost. Following the secularization of the missions, most surviving Gabrielefio/Tongva became wage laborers on the ranchos of Mexican California and were later nearly wiped out as a result of a smallpox outbreak in the 1860s. The combination of removal, murder, disease, forced labor, and poor diet contributed to the harmful diaspora of the Gabrielefio/Tongva from established villages to scattered areas of the Los Angeles Basin for survival (Bean and Smith 1978). This history of displacement within their own ancestral lands has led to difficulty in attaining federal recognition. However, the 20" century found a revitalization of the Gabrielefio/Tongva people and culture, and though the communities remain unrecognized by the Federal government, they remain a very active people in the Los Angeles Basin today. 3.3 Prehistoric Setting Cultural theoretic frameworks for southern California archaeology are frequently debated and refined by archaeologists. The early models proposed by Wallace (1955, 1978) and Warren (1968) continue to be incorporated into cultural studies with revisions. Archaeologists have developed the cultural frameworks in southern California by generally relying on relative dating methods using diagnostic artifacts as opposed to absolute dating due to a lack of chronometric data available in the regional record. The framework proposed by Wallace introduced the Early Period, Millingstone Period, Intermediate Period, and Late Prehistoric Period, which follows the geologic time scale of Early, Middle and Late Holocene. Early Holocene (10,000-7500 calibrated years Before Present (cal BP)) A gradual warming of the environment occurred during the Early Holocene. Researchers have proposed that groups from the Early Holocene were highly mobile and traveled across wide ranges. Cultural resources were portable or expedient to accommodate mobility. Archaeologists have recorded artifacts associated with hunting and plant processing at early Holocene sites, such as projectile points, bifaces, and groundstone tools. Middle Holocene (7500-3500 cal BP) The Millingstone Period during the Middle Holocene is characterized by new artifact types. The warming of the environment resulted in adaptations to changing environments and associated plant and animal resources. Temporary and seasonal camps were utilized during the Middle Holocene. Tools were intentionally cached, which indicate an intent to return to specific sites over time. Diagnostic artifacts have been recorded at Middle Holocene sites, such as Pinto and Silver Lake projectile points. Late Holocene (3500 cal BP through Historic Contact) Archaeological sites from the Late Holocene contain increasingly diverse artifact assemblages. Increased population is evident and multiple family groups likely coexisted within the communities. Proximity to September 2025 Kimley»Horn Page | 9 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment Records show that the long history of European colonization and harmful displacement of Native Americans began in 1542 as a result of Juan Rodriguez Cabrillo visiting the area. Following many subsequent Spanish visits to the region, the colonization of the indigenous population continued alongside the establishment of Missions San Gabriel in 1771 and San Fernando in 1797. Due in part to the introduction of new diseases, as well as the harsh conditions of mission life, the indigenous population quickly dwindled and cultural practices were lost. Following the secularization of the missions, most surviving Gabrielefio/Tongva became wage laborers on the ranchos of Mexican California and were later nearly wiped out as a result of a smallpox outbreak in the 1860s. The combination of removal, murder, disease, forced labor, and poor diet contributed to the harmful diaspora of the Gabrielefio/Tongva from established villages to scattered areas of the Los Angeles Basin for survival (Bean and Smith 1978). This history of displacement within their own ancestral lands has led to difficulty in attaining federal recognition. However, the 20" century found a revitalization of the Gabrielefio/Tongva people and culture, and though the communities remain unrecognized by the Federal government, they remain a very active people in the Los Angeles Basin today. 3.3 Prehistoric Setting Cultural theoretic frameworks for southern California archaeology are frequently debated and refined by archaeologists. The early models proposed by Wallace (1955, 1978) and Warren (1968) continue to be incorporated into cultural studies with revisions. Archaeologists have developed the cultural frameworks in southern California by generally relying on relative dating methods using diagnostic artifacts as opposed to absolute dating due to a lack of chronometric data available in the regional record. The framework proposed by Wallace introduced the Early Period, Millingstone Period, Intermediate Period, and Late Prehistoric Period, which follows the geologic time scale of Early, Middle and Late Holocene. Early Holocene (10,000-7500 calibrated years Before Present (cal BP)) A gradual warming of the environment occurred during the Early Holocene. Researchers have proposed that groups from the Early Holocene were highly mobile and traveled across wide ranges. Cultural resources were portable or expedient to accommodate mobility. Archaeologists have recorded artifacts associated with hunting and plant processing at early Holocene sites, such as projectile points, bifaces, and groundstone tools. Middle Holocene (7500-3500 cal BP) The Millingstone Period during the Middle Holocene is characterized by new artifact types. The warming of the environment resulted in adaptations to changing environments and associated plant and animal resources. Temporary and seasonal camps were utilized during the Middle Holocene. Tools were intentionally cached, which indicate an intent to return to specific sites over time. Diagnostic artifacts have been recorded at Middle Holocene sites, such as Pinto and Silver Lake projectile points. Late Holocene (3500 cal BP through Historic Contact) Archaeological sites from the Late Holocene contain increasingly diverse artifact assemblages. Increased population is evident and multiple family groups likely coexisted within the communities. Proximity to September 2025 Kimley»Horn Page | 9 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment Records show that the long history of European colonization and harmful displacement of Native Americans began in 1542 as a result of Juan Rodriguez Cabrillo visiting the area. Following many subsequent Spanish visits to the region, the colonization of the indigenous population continued alongside the establishment of Missions San Gabriel in 1771 and San Fernando in 1797. Due in part to the introduction of new diseases, as well as the harsh conditions of mission life, the indigenous population quickly dwindled and cultural practices were lost. Following the secularization of the missions, most surviving Gabrielefio/Tongva became wage laborers on the ranchos of Mexican California and were later nearly wiped out as a result of a smallpox outbreak in the 1860s. The combination of removal, murder, disease, forced labor, and poor diet contributed to the harmful diaspora of the Gabrielefio/Tongva from established villages to scattered areas of the Los Angeles Basin for survival (Bean and Smith 1978). This history of displacement within their own ancestral lands has led to difficulty in attaining federal recognition. However, the 20" century found a revitalization of the Gabrielefio/Tongva people and culture, and though the communities remain unrecognized by the Federal government, they remain a very active people in the Los Angeles Basin today. 3.3 Prehistoric Setting Cultural theoretic frameworks for southern California archaeology are frequently debated and refined by archaeologists. The early models proposed by Wallace (1955, 1978) and Warren (1968) continue to be incorporated into cultural studies with revisions. Archaeologists have developed the cultural frameworks in southern California by generally relying on relative dating methods using diagnostic artifacts as opposed to absolute dating due to a lack of chronometric data available in the regional record. The framework proposed by Wallace introduced the Early Period, Millingstone Period, Intermediate Period, and Late Prehistoric Period, which follows the geologic time scale of Early, Middle and Late Holocene. Early Holocene (10,000-7500 calibrated years Before Present (cal BP)) A gradual warming of the environment occurred during the Early Holocene. Researchers have proposed that groups from the Early Holocene were highly mobile and traveled across wide ranges. Cultural resources were portable or expedient to accommodate mobility. Archaeologists have recorded artifacts associated with hunting and plant processing at early Holocene sites, such as projectile points, bifaces, and groundstone tools. Middle Holocene (7500-3500 cal BP) The Millingstone Period during the Middle Holocene is characterized by new artifact types. The warming of the environment resulted in adaptations to changing environments and associated plant and animal resources. Temporary and seasonal camps were utilized during the Middle Holocene. Tools were intentionally cached, which indicate an intent to return to specific sites over time. Diagnostic artifacts have been recorded at Middle Holocene sites, such as Pinto and Silver Lake projectile points. Late Holocene (3500 cal BP through Historic Contact) Archaeological sites from the Late Holocene contain increasingly diverse artifact assemblages. Increased population is evident and multiple family groups likely coexisted within the communities. Proximity to September 2025 Kimley»Horn Page | 9 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 10 water was an important factor for the seasonal and permanent settlements. Late Prehistoric archaeological sites contained diverse artifact assemblages, including projectile points, ceramics, pendants, incised stones, and shell beads. An increase in hunting efficiency occurred during the Late Prehistoric Period and Protohistoric Period, which is evident by the bow and arrow technology. An abundance of mortars and pestles have been recorded at village sites and further indicate a transition towards sedentary habitation. 4.0 RESULTS 4.1 Archaeological Record Search Kimley-Horn conducted an archaeological records search at the SCCIC on August 14, 2025, to identify any previously recorded archaeological resources or previously conducted cultural resources studies within the record search area. The record search area was defined as the Project area plus a half-mile buffer. The SCCIC reported 11 previous studies and one (1) archaeological resource within the record search area. Out of the 11 previous studies, five (5) studies were conducted within the Project area with negative results for any archaeological resources, as outlined in Table 1. The one (1) recorded archaeological resource (P-19-001009) in the half-mile buffer is a prehistoric artifact scatter situated approximately 0.40 miles southeast of the Project area. Table 1: Previous Cultural Studies in the Project Area Report No. Authors Year Title LA-00358 Stickel, Gary E. 1976 An Archaeological and Paleontological Resource Survey of the Los Angeles River, Rio Hondo River and the Whittier Narrows Flood Control Basin, Los Angeles, California LA-04659 Maxwell, Pamela 1993 Records and Literature Survey for the Whittier Narrows Water Control Manual Project, Los Angeles County, California LA-05455 Maxwell, Pamela 1994 Cultural Resource Evaluation for Whittier Narrows Project Master Plan and Environmental Assessment, Los Angeles County, California LA-05456 McLean, Roderic 1994 Archival Study and Archaeological Survey for the Whittier Narrows Water Reclamation Project (golf Course Storage Lakes), Los Angeles County, California LA-07295 Demcak, Carol R. 2003 Report of Archaeological Resources Assessment for 22.37-acre Proposed Walmart Site in Rosemead, Los Angeles County, California 4.2 Sacred Land File Search An SLF search request was submitted to the NAHC to identify any documented sacred lands in or near the Project area. On August 7, 2025, the NAHC responded with positive results. The NAHC indicated that the Gabrieleno Band of Mission Indians – Kizh Nation and the Gabrieleno/Tongva San Gabriel Band of Mission Indians should be contacted for further information about the sacred site. A copy of the NAHC’s response is included in Appendix A: SLF Search Results. City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment water was an important factor for the seasonal and permanent settlements. Late Prehistoric archaeological sites contained diverse artifact assemblages, including projectile points, ceramics, pendants, incised stones, and shell beads. An increase in hunting efficiency occurred during the Late Prehistoric Period and Protohistoric Period, which is evident by the bow and arrow technology. An abundance of mortars and pestles have been recorded at village sites and further indicate a transition towards sedentary habitation. 4.0 RESULTS 4.1 Archaeological Record Search Kimley-Horn conducted an archaeological records search at the SCCIC on August 14, 2025, to identify any previously recorded archaeological resources or previously conducted cultural resources studies within the record search area. The record search area was defined as the Project area plus a half-mile buffer. The SCCIC reported 11 previous studies and one (1) archaeological resource within the record search area. Out of the 11 previous studies, five (5) studies were conducted within the Project area with negative results for any archaeological resources, as outlined in Table 1. The one (1) recorded archaeological resource (P-19-001009) in the half-mile buffer is a prehistoric artifact scatter situated approximately 0.40 miles southeast of the Project area. Table 1: Previous Cultural Studies in the Project Area IlesNo. [ Authors | Year | Title BR. LA-00358 Stickel, 1976 | An Archaeological and Paleontological Resource Survey of the Los Gary E. Angeles River, Rio Hondo River and the Whittier Narrows Flood Control Basin, Los Angeles, California LA-04659 Maxwell, | 1993 | Records and Literature Survey for the Whittier Narrows Water Pamela Control Manual Project, Los Angeles County, California LA-05455 Maxwell, | 1994 | Cultural Resource Evaluation for Whittier Narrows Project Master Pamela Plan and Environmental Assessment, Los Angeles County, California LA-05456 McLean, | 1994 | Archival Study and Archaeological Survey for the Whittier Narrows Roderic Water Reclamation Project (golf Course Storage Lakes), Los Angeles County, California LA-07295 Demcak, | 2003 | Report of Archaeological Resources Assessment for 22.37-acre Carol R. Proposed Walmart Site in Rosemead, Los Angeles County, California 4.2 Sacred Land File Search An SLF search request was submitted to the NAHC to identify any documented sacred lands in or near the Project area. On August 7, 2025, the NAHC responded with positive results. The NAHC indicated that the Gabrieleno Band of Mission Indians — Kizh Nation and the Gabrieleno/Tongva San Gabriel Band of Mission Indians should be contacted for further information about the sacred site. A copy of the NAHC’s response is included in Appendix A: SLF Search Results. September 2025 Kimley»Horn Page | 10 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment water was an important factor for the seasonal and permanent settlements. Late Prehistoric archaeological sites contained diverse artifact assemblages, including projectile points, ceramics, pendants, incised stones, and shell beads. An increase in hunting efficiency occurred during the Late Prehistoric Period and Protohistoric Period, which is evident by the bow and arrow technology. An abundance of mortars and pestles have been recorded at village sites and further indicate a transition towards sedentary habitation. 4.0 RESULTS 4.1 Archaeological Record Search Kimley-Horn conducted an archaeological records search at the SCCIC on August 14, 2025, to identify any previously recorded archaeological resources or previously conducted cultural resources studies within the record search area. The record search area was defined as the Project area plus a half-mile buffer. The SCCIC reported 11 previous studies and one (1) archaeological resource within the record search area. Out of the 11 previous studies, five (5) studies were conducted within the Project area with negative results for any archaeological resources, as outlined in Table 1. The one (1) recorded archaeological resource (P-19-001009) in the half-mile buffer is a prehistoric artifact scatter situated approximately 0.40 miles southeast of the Project area. Table 1: Previous Cultural Studies in the Project Area IlesNo. [ Authors | Year | Title BR. LA-00358 Stickel, 1976 | An Archaeological and Paleontological Resource Survey of the Los Gary E. Angeles River, Rio Hondo River and the Whittier Narrows Flood Control Basin, Los Angeles, California LA-04659 Maxwell, | 1993 | Records and Literature Survey for the Whittier Narrows Water Pamela Control Manual Project, Los Angeles County, California LA-05455 Maxwell, | 1994 | Cultural Resource Evaluation for Whittier Narrows Project Master Pamela Plan and Environmental Assessment, Los Angeles County, California LA-05456 McLean, | 1994 | Archival Study and Archaeological Survey for the Whittier Narrows Roderic Water Reclamation Project (golf Course Storage Lakes), Los Angeles County, California LA-07295 Demcak, | 2003 | Report of Archaeological Resources Assessment for 22.37-acre Carol R. Proposed Walmart Site in Rosemead, Los Angeles County, California 4.2 Sacred Land File Search An SLF search request was submitted to the NAHC to identify any documented sacred lands in or near the Project area. On August 7, 2025, the NAHC responded with positive results. The NAHC indicated that the Gabrieleno Band of Mission Indians — Kizh Nation and the Gabrieleno/Tongva San Gabriel Band of Mission Indians should be contacted for further information about the sacred site. A copy of the NAHC’s response is included in Appendix A: SLF Search Results. September 2025 Kimley»Horn Page | 10 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment water was an important factor for the seasonal and permanent settlements. Late Prehistoric archaeological sites contained diverse artifact assemblages, including projectile points, ceramics, pendants, incised stones, and shell beads. An increase in hunting efficiency occurred during the Late Prehistoric Period and Protohistoric Period, which is evident by the bow and arrow technology. An abundance of mortars and pestles have been recorded at village sites and further indicate a transition towards sedentary habitation. 4.0 RESULTS 4.1 Archaeological Record Search Kimley-Horn conducted an archaeological records search at the SCCIC on August 14, 2025, to identify any previously recorded archaeological resources or previously conducted cultural resources studies within the record search area. The record search area was defined as the Project area plus a half-mile buffer. The SCCIC reported 11 previous studies and one (1) archaeological resource within the record search area. Out of the 11 previous studies, five (5) studies were conducted within the Project area with negative results for any archaeological resources, as outlined in Table 1. The one (1) recorded archaeological resource (P-19-001009) in the half-mile buffer is a prehistoric artifact scatter situated approximately 0.40 miles southeast of the Project area. Table 1: Previous Cultural Studies in the Project Area IlesNo. [ Authors | Year | Title BR. LA-00358 Stickel, 1976 | An Archaeological and Paleontological Resource Survey of the Los Gary E. Angeles River, Rio Hondo River and the Whittier Narrows Flood Control Basin, Los Angeles, California LA-04659 Maxwell, | 1993 | Records and Literature Survey for the Whittier Narrows Water Pamela Control Manual Project, Los Angeles County, California LA-05455 Maxwell, | 1994 | Cultural Resource Evaluation for Whittier Narrows Project Master Pamela Plan and Environmental Assessment, Los Angeles County, California LA-05456 McLean, | 1994 | Archival Study and Archaeological Survey for the Whittier Narrows Roderic Water Reclamation Project (golf Course Storage Lakes), Los Angeles County, California LA-07295 Demcak, | 2003 | Report of Archaeological Resources Assessment for 22.37-acre Carol R. Proposed Walmart Site in Rosemead, Los Angeles County, California 4.2 Sacred Land File Search An SLF search request was submitted to the NAHC to identify any documented sacred lands in or near the Project area. On August 7, 2025, the NAHC responded with positive results. The NAHC indicated that the Gabrieleno Band of Mission Indians — Kizh Nation and the Gabrieleno/Tongva San Gabriel Band of Mission Indians should be contacted for further information about the sacred site. A copy of the NAHC’s response is included in Appendix A: SLF Search Results. September 2025 Kimley»Horn Page | 10 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 11 4.3 Database Review Kimley-Horn reviewed a database of historic maps and aerial imagery for the Project area. Historic aerial imagery is available for the Project area from 1948 through present, and historic topographic maps are available from 1894 through present (Historic Aerials 2025). The aerials show that the Project area was developed as farmland before the 1940s (Figure 4). By 1980, the Project area was vacant and no longer operated as agricultural land (Figure 5). A commercial property was developed in the Project area between 1980 and 1987 (Figure 6). Little to no changes have occurred to the built environment since that time. Figure 4: Historic Aerial Image of the Project Area in 1948 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 4.3 Database Review Kimley-Horn reviewed a database of historic maps and aerial imagery for the Project area. Historic aerial imagery is available for the Project area from 1948 through present, and historic topographic maps are available from 1894 through present (Historic Aerials 2025). The aerials show that the Project area was developed as farmland before the 1940s (Figure 4). By 1980, the Project area was vacant and no longer operated as agricultural land (Figure 5). A commercial property was developed in the Project area between 1980 and 1987 (Figure 6). Little to no changes have occurred to the built environment since that time. September 2025 Kimley»Horn Page | 11 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 4.3 Database Review Kimley-Horn reviewed a database of historic maps and aerial imagery for the Project area. Historic aerial imagery is available for the Project area from 1948 through present, and historic topographic maps are available from 1894 through present (Historic Aerials 2025). The aerials show that the Project area was developed as farmland before the 1940s (Figure 4). By 1980, the Project area was vacant and no longer operated as agricultural land (Figure 5). A commercial property was developed in the Project area between 1980 and 1987 (Figure 6). Little to no changes have occurred to the built environment since that time. September 2025 Kimley»Horn Page | 11 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 4.3 Database Review Kimley-Horn reviewed a database of historic maps and aerial imagery for the Project area. Historic aerial imagery is available for the Project area from 1948 through present, and historic topographic maps are available from 1894 through present (Historic Aerials 2025). The aerials show that the Project area was developed as farmland before the 1940s (Figure 4). By 1980, the Project area was vacant and no longer operated as agricultural land (Figure 5). A commercial property was developed in the Project area between 1980 and 1987 (Figure 6). Little to no changes have occurred to the built environment since that time. September 2025 Kimley»Horn Page | 11 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 12 Figure 5: Historic Aerial Image of the Project Area in 1980 Figure 6: Historic Aerial Image of the Project Area in 1987 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment CN SNEEN C FEIT Figure 5: Historic Aerial Image of the Project Area in 1980 Figure 6: Historic Aerial Image of the Project Area in 1987 September 2025 Kimley»Horn Page | 12 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment CN SNEEN C FEIT Figure 5: Historic Aerial Image of the Project Area in 1980 Figure 6: Historic Aerial Image of the Project Area in 1987 September 2025 Kimley»Horn Page | 12 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment CN SNEEN C FEIT Figure 5: Historic Aerial Image of the Project Area in 1980 Figure 6: Historic Aerial Image of the Project Area in 1987 September 2025 Kimley»Horn Page | 12 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 13 5.0 CONCLUSION AND RECOMMENDATIONS 5.1 Archaeological Resources Kimley-Horn did not identify any archaeological resources within the Project area during the efforts conducted for this study. As such, no archaeological resources that meet the definition of “Historical Resources” or “Unique Archaeological Resources”, as defined by CEQA, have been identified within the Project area. Archaeological resources are unlikely to be present on the surface or immediately subsurface given the extent of previous development. However, there is a moderate archaeological sensitivity and potential for buried prehistoric or historic-period archaeological resources past the depths of fill due to the alluvial fan topography, underlying Holocene-age geological deposits, previously recorded prehistoric site near the Project area, and prehistoric and historic-era occupation in this region. 5.2 Recommendations Therefore, mitigation measures or conditions of approval should be included that outline an archaeological resources training, archaeological monitoring, and the process for treatment of any archaeological resource and/or human remains inadvertently discovered during Project construction. It is important to note that, while archaeological resources of Native American origin may also be considered a Tribal Cultural Resource (TCR), as defined by CEQA, this report does not include discussion related to the presence of TCRs, as this is determined via government-to-government consultation between the Lead Agency and Native American Tribes. As such, recommendations made within this report as it relates to archaeological resources of Native American origin should be considered alongside the results of any required Tribal consultation. With such mitigation measures or conditions of approval in place, the Project would be unlikely to cause a substantial adverse change in the significance of an archaeological resource and impacts to archaeological resources would be less than significant. Example language of such measures or conditions, which may be updated as a result of any required Tribal consultation, are included below. • CUL-1: Archaeological Resources Training Prior to the issuance of any permit for ground-disturbing activities, the Applicant shall provide evidence to the City that a qualified professional archaeologist meeting Secretary of the Interior professional qualifications (Project Archaeologist) has been retained. An Archaeological Resources Training shall be provided to all construction managers and construction personnel engaged in relevant job activities prior to commencing any ground disturbance work within the Project area. The training shall be prepared and conducted by the Project Archaeologist. The training content shall include, but not be limited to, information about archaeological resources in the vicinity, types of common archaeological resources in southern California, and the procedures to be followed to protect any such resources in the case of inadvertent discovery. The training may be discontinued when ground disturbance activities for the Project are completed. Construction personnel shall not be permitted to operate equipment within the construction area during the relevant period unless they have attended the training. City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 5.0 CONCLUSION AND RECOMMENDATIONS 5.1 Archaeological Resources Kimley-Horn did not identify any archaeological resources within the Project area during the efforts conducted for this study. As such, no archaeological resources that meet the definition of “Historical Resources” or “Unique Archaeological Resources”, as defined by CEQA, have been identified within the Project area. Archaeological resources are unlikely to be present on the surface or immediately subsurface given the extent of previous development. However, there is a moderate archaeological sensitivity and potential for buried prehistoric or historic-period archaeological resources past the depths of fill due to the alluvial fan topography, underlying Holocene-age geological deposits, previously recorded prehistoric site near the Project area, and prehistoric and historic-era occupation in this region. 5.2 Recommendations Therefore, mitigation measures or conditions of approval should be included that outline an archaeological resources training, archaeological monitoring, and the process for treatment of any archaeological resource and/or human remains inadvertently discovered during Project construction. It is important to note that, while archaeological resources of Native American origin may also be considered a Tribal Cultural Resource (TCR), as defined by CEQA, this report does not include discussion related to the presence of TCRs, as this is determined via government-to-government consultation between the Lead Agency and Native American Tribes. As such, recommendations made within this report as it relates to archaeological resources of Native American origin should be considered alongside the results of any required Tribal consultation. With such mitigation measures or conditions of approval in place, the Project would be unlikely to cause a substantial adverse change in the significance of an archaeological resource and impacts to archaeological resources would be less than significant. Example language of such measures or conditions, which may be updated as a result of any required Tribal consultation, are included below. e CUL-1: Archaeological Resources Training Prior to the issuance of any permit for ground-disturbing activities, the Applicant shall provide evidence to the City that a qualified professional archaeologist meeting Secretary of the Interior professional qualifications (Project Archaeologist) has been retained. An Archaeological Resources Training shall be provided to all construction managers and construction personnel engaged in relevant job activities prior to commencing any ground disturbance work within the Project area. The training shall be prepared and conducted by the Project Archaeologist. The training content shall include, but not be limited to, information about archaeological resources in the vicinity, types of common archaeological resources in southern California, and the procedures to be followed to protect any such resources in the case of inadvertent discovery. The training may be discontinued when ground disturbance activities for the Project are completed. Construction personnel shall not be permitted to operate equipment within the construction area during the relevant period unless they have attended the training. September 2025 Kimley»Horn Page | 13 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 5.0 CONCLUSION AND RECOMMENDATIONS 5.1 Archaeological Resources Kimley-Horn did not identify any archaeological resources within the Project area during the efforts conducted for this study. As such, no archaeological resources that meet the definition of “Historical Resources” or “Unique Archaeological Resources”, as defined by CEQA, have been identified within the Project area. Archaeological resources are unlikely to be present on the surface or immediately subsurface given the extent of previous development. However, there is a moderate archaeological sensitivity and potential for buried prehistoric or historic-period archaeological resources past the depths of fill due to the alluvial fan topography, underlying Holocene-age geological deposits, previously recorded prehistoric site near the Project area, and prehistoric and historic-era occupation in this region. 5.2 Recommendations Therefore, mitigation measures or conditions of approval should be included that outline an archaeological resources training, archaeological monitoring, and the process for treatment of any archaeological resource and/or human remains inadvertently discovered during Project construction. It is important to note that, while archaeological resources of Native American origin may also be considered a Tribal Cultural Resource (TCR), as defined by CEQA, this report does not include discussion related to the presence of TCRs, as this is determined via government-to-government consultation between the Lead Agency and Native American Tribes. As such, recommendations made within this report as it relates to archaeological resources of Native American origin should be considered alongside the results of any required Tribal consultation. With such mitigation measures or conditions of approval in place, the Project would be unlikely to cause a substantial adverse change in the significance of an archaeological resource and impacts to archaeological resources would be less than significant. Example language of such measures or conditions, which may be updated as a result of any required Tribal consultation, are included below. e CUL-1: Archaeological Resources Training Prior to the issuance of any permit for ground-disturbing activities, the Applicant shall provide evidence to the City that a qualified professional archaeologist meeting Secretary of the Interior professional qualifications (Project Archaeologist) has been retained. An Archaeological Resources Training shall be provided to all construction managers and construction personnel engaged in relevant job activities prior to commencing any ground disturbance work within the Project area. The training shall be prepared and conducted by the Project Archaeologist. The training content shall include, but not be limited to, information about archaeological resources in the vicinity, types of common archaeological resources in southern California, and the procedures to be followed to protect any such resources in the case of inadvertent discovery. The training may be discontinued when ground disturbance activities for the Project are completed. Construction personnel shall not be permitted to operate equipment within the construction area during the relevant period unless they have attended the training. September 2025 Kimley»Horn Page | 13 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 5.0 CONCLUSION AND RECOMMENDATIONS 5.1 Archaeological Resources Kimley-Horn did not identify any archaeological resources within the Project area during the efforts conducted for this study. As such, no archaeological resources that meet the definition of “Historical Resources” or “Unique Archaeological Resources”, as defined by CEQA, have been identified within the Project area. Archaeological resources are unlikely to be present on the surface or immediately subsurface given the extent of previous development. However, there is a moderate archaeological sensitivity and potential for buried prehistoric or historic-period archaeological resources past the depths of fill due to the alluvial fan topography, underlying Holocene-age geological deposits, previously recorded prehistoric site near the Project area, and prehistoric and historic-era occupation in this region. 5.2 Recommendations Therefore, mitigation measures or conditions of approval should be included that outline an archaeological resources training, archaeological monitoring, and the process for treatment of any archaeological resource and/or human remains inadvertently discovered during Project construction. It is important to note that, while archaeological resources of Native American origin may also be considered a Tribal Cultural Resource (TCR), as defined by CEQA, this report does not include discussion related to the presence of TCRs, as this is determined via government-to-government consultation between the Lead Agency and Native American Tribes. As such, recommendations made within this report as it relates to archaeological resources of Native American origin should be considered alongside the results of any required Tribal consultation. With such mitigation measures or conditions of approval in place, the Project would be unlikely to cause a substantial adverse change in the significance of an archaeological resource and impacts to archaeological resources would be less than significant. Example language of such measures or conditions, which may be updated as a result of any required Tribal consultation, are included below. e CUL-1: Archaeological Resources Training Prior to the issuance of any permit for ground-disturbing activities, the Applicant shall provide evidence to the City that a qualified professional archaeologist meeting Secretary of the Interior professional qualifications (Project Archaeologist) has been retained. An Archaeological Resources Training shall be provided to all construction managers and construction personnel engaged in relevant job activities prior to commencing any ground disturbance work within the Project area. The training shall be prepared and conducted by the Project Archaeologist. The training content shall include, but not be limited to, information about archaeological resources in the vicinity, types of common archaeological resources in southern California, and the procedures to be followed to protect any such resources in the case of inadvertent discovery. The training may be discontinued when ground disturbance activities for the Project are completed. Construction personnel shall not be permitted to operate equipment within the construction area during the relevant period unless they have attended the training. September 2025 Kimley»Horn Page | 13 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 14 • CUL-2: Archaeological Monitoring The Project Archaeologist or their designee (Monitors) will conduct archaeological monitoring of all ground disturbing activities within native, undisturbed soils. The Project Archaeologist will have the ability to recommend monitoring be decreased or eliminated at any time, based on the absence of cultural resources and/or indication of subsurface soils possessing a low likelihood for significant intact resources. • CUL-3: Inadvertent Discovery of Archaeological Resources In the event that any archaeological resources are inadvertently discovered at the Project area, all work shall temporarily halt within 50 feet of the find. The Applicant shall notify the City and consult with the Project Archaeologist who shall record and evaluate the find. If the find is determined to be significant, the Project Archaeologist shall recommend a treatment plan to the City. If avoidance is determined to be infeasible, other appropriate treatment measures (e.g., data recovery) shall be instituted. Ground disturbing activities may resume once the recommendations have been fully implemented. • CUL-4: Inadvertent Discovery of Human Remains In the event that human skeletal remains are encountered at the Project area, all work shall halt immediately within 100 feet, pursuant to State Health and Safety Code Section 7050.5. No further ground disturbance shall occur until the County Coroner has made the necessary findings as to the origin and disposition pursuant to California Public Resources Code Section 5097.98. The following procedures shall be followed: o Stop immediately and contact the County Coroner: 1104 N. Mission Road Los Angeles, CA 90033 323‐343‐0512 (8 a.m. to 5 p.m. Monday through Friday) or 323‐343‐0714 (After Hours, Saturday, Sunday, and Holidays). o If the remains are determined to be of Native American descent, the Coroner has 24 hours to notify the Native American Heritage Commission (NAHC). o The NAHC will immediately notify the person it believes to be the most likely descendent of the deceased Native American. o The most likely descendant has 48 hours to make recommendations to the Applicant, for the treatment or disposition, with proper dignity, of the human remains and grave goods. o If the Applicant does not accept the descendant’s recommendations, the owner or the descendant may request mediation by the NAHC. o If the NAHC is unable to identify a Most Likely Descendent (MLD), if an MLD does not make a recommendation, or if mediation fails, the human remains shall be reburied on site with appropriate dignity in an area that will not be subject to future disturbance. City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment e CUL-2: Archaeological Monitoring The Project Archaeologist or their designee (Monitors) will conduct archaeological monitoring of all ground disturbing activities within native, undisturbed soils. The Project Archaeologist will have the ability to recommend monitoring be decreased or eliminated at any time, based on the absence of cultural resources and/or indication of subsurface soils possessing a low likelihood for significant intact resources. e CUL-3: Inadvertent Discovery of Archaeological Resources In the event that any archaeological resources are inadvertently discovered at the Project area, all work shall temporarily halt within 50 feet of the find. The Applicant shall notify the City and consult with the Project Archaeologist who shall record and evaluate the find. If the find is determined to be significant, the Project Archaeologist shall recommend a treatment plan to the City. If avoidance is determined to be infeasible, other appropriate treatment measures (e.g., data recovery) shall be instituted. Ground disturbing activities may resume once the recommendations have been fully implemented. e CUL-4: Inadvertent Discovery of Human Remains In the event that human skeletal remains are encountered at the Project area, all work shall halt immediately within 100 feet, pursuant to State Health and Safety Code Section 7050.5. No further ground disturbance shall occur until the County Coroner has made the necessary findings as to the origin and disposition pursuant to California Public Resources Code Section 5097.98. The following procedures shall be followed: o Stop immediately and contact the County Coroner: 1104 N. Mission Road Los Angeles, CA 90033 323-343-0512 (8 a.m. to 5 p.m. Monday through Friday) or 323-343-0714 (After Hours, Saturday, Sunday, and Holidays). o Ifthe remains are determined to be of Native American descent, the Coroner has 24 hours to notify the Native American Heritage Commission (NAHC). o The NAHC will immediately notify the person it believes to be the most likely descendent of the deceased Native American. o The most likely descendant has 48 hours to make recommendations to the Applicant, for the treatment or disposition, with proper dignity, of the human remains and grave goods. o If the Applicant does not accept the descendant’s recommendations, the owner or the descendant may request mediation by the NAHC. o If the NAHC is unable to identify a Most Likely Descendent (MLD), if an MLD does not make a recommendation, or if mediation fails, the human remains shall be reburied on site with appropriate dignity in an area that will not be subject to future disturbance. September 2025 Kimley»Horn Page | 14 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment e CUL-2: Archaeological Monitoring The Project Archaeologist or their designee (Monitors) will conduct archaeological monitoring of all ground disturbing activities within native, undisturbed soils. The Project Archaeologist will have the ability to recommend monitoring be decreased or eliminated at any time, based on the absence of cultural resources and/or indication of subsurface soils possessing a low likelihood for significant intact resources. e CUL-3: Inadvertent Discovery of Archaeological Resources In the event that any archaeological resources are inadvertently discovered at the Project area, all work shall temporarily halt within 50 feet of the find. The Applicant shall notify the City and consult with the Project Archaeologist who shall record and evaluate the find. If the find is determined to be significant, the Project Archaeologist shall recommend a treatment plan to the City. If avoidance is determined to be infeasible, other appropriate treatment measures (e.g., data recovery) shall be instituted. Ground disturbing activities may resume once the recommendations have been fully implemented. e CUL-4: Inadvertent Discovery of Human Remains In the event that human skeletal remains are encountered at the Project area, all work shall halt immediately within 100 feet, pursuant to State Health and Safety Code Section 7050.5. No further ground disturbance shall occur until the County Coroner has made the necessary findings as to the origin and disposition pursuant to California Public Resources Code Section 5097.98. The following procedures shall be followed: o Stop immediately and contact the County Coroner: 1104 N. Mission Road Los Angeles, CA 90033 323-343-0512 (8 a.m. to 5 p.m. Monday through Friday) or 323-343-0714 (After Hours, Saturday, Sunday, and Holidays). o Ifthe remains are determined to be of Native American descent, the Coroner has 24 hours to notify the Native American Heritage Commission (NAHC). o The NAHC will immediately notify the person it believes to be the most likely descendent of the deceased Native American. o The most likely descendant has 48 hours to make recommendations to the Applicant, for the treatment or disposition, with proper dignity, of the human remains and grave goods. o If the Applicant does not accept the descendant’s recommendations, the owner or the descendant may request mediation by the NAHC. o If the NAHC is unable to identify a Most Likely Descendent (MLD), if an MLD does not make a recommendation, or if mediation fails, the human remains shall be reburied on site with appropriate dignity in an area that will not be subject to future disturbance. September 2025 Kimley»Horn Page | 14 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment e CUL-2: Archaeological Monitoring The Project Archaeologist or their designee (Monitors) will conduct archaeological monitoring of all ground disturbing activities within native, undisturbed soils. The Project Archaeologist will have the ability to recommend monitoring be decreased or eliminated at any time, based on the absence of cultural resources and/or indication of subsurface soils possessing a low likelihood for significant intact resources. e CUL-3: Inadvertent Discovery of Archaeological Resources In the event that any archaeological resources are inadvertently discovered at the Project area, all work shall temporarily halt within 50 feet of the find. The Applicant shall notify the City and consult with the Project Archaeologist who shall record and evaluate the find. If the find is determined to be significant, the Project Archaeologist shall recommend a treatment plan to the City. If avoidance is determined to be infeasible, other appropriate treatment measures (e.g., data recovery) shall be instituted. Ground disturbing activities may resume once the recommendations have been fully implemented. e CUL-4: Inadvertent Discovery of Human Remains In the event that human skeletal remains are encountered at the Project area, all work shall halt immediately within 100 feet, pursuant to State Health and Safety Code Section 7050.5. No further ground disturbance shall occur until the County Coroner has made the necessary findings as to the origin and disposition pursuant to California Public Resources Code Section 5097.98. The following procedures shall be followed: o Stop immediately and contact the County Coroner: 1104 N. Mission Road Los Angeles, CA 90033 323-343-0512 (8 a.m. to 5 p.m. Monday through Friday) or 323-343-0714 (After Hours, Saturday, Sunday, and Holidays). o Ifthe remains are determined to be of Native American descent, the Coroner has 24 hours to notify the Native American Heritage Commission (NAHC). o The NAHC will immediately notify the person it believes to be the most likely descendent of the deceased Native American. o The most likely descendant has 48 hours to make recommendations to the Applicant, for the treatment or disposition, with proper dignity, of the human remains and grave goods. o If the Applicant does not accept the descendant’s recommendations, the owner or the descendant may request mediation by the NAHC. o If the NAHC is unable to identify a Most Likely Descendent (MLD), if an MLD does not make a recommendation, or if mediation fails, the human remains shall be reburied on site with appropriate dignity in an area that will not be subject to future disturbance. September 2025 Kimley»Horn Page | 14 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 15 6.0 REFERENCES Bean, Lowell John, and Charles R. Smith 1978 Gabrielino. In Handbook of North American Indians, Vol. 8, California. William C. Sturtevant, gen. ed., Robert F. Heizer, vol. ed. Washington: Smithsonian Institution. City of Rosemead 2025 About Rosemead| City of Rosemead. Cheng, Wendy 2014 A Brief History (and Geography) of the San Gabriel Valley. PBS SoCal. A Brief History (and Geography) of the San Gabriel Valley | History & Society | PBS SoCal. Historic Aerials 2025 Historic Aerial Viewer. https://www.historicaerials.com/viewer. Hudson, Travis, and Thomas C. Blackburn 1982 The Material Culture of the Chumash Interaction Sphere, Volume III: Clothing, Ornamentation, and Grooming. Ballena Press Anthropological Papers, No. 28. Kroeber, Alfred L. 1925 Handbook of the Indians of California. Bureau of American Ethnology Bulletin No. 78. Washington D.C.: Smithsonian Institution. Reprinted in 1976, New York: Dover. SoilWeb 2025 National Resources Conservation Service Soil Survey Program website. https://casoilresource.lawr.ucdavis.edu/gmap/. Tan, S.S. 2000 Geologic Map of the El Monte 7.5-Minute Quadrangle, Los Angeles County, California. California Division of Mines and Geology. Open-File Report OFR-98-29. U.S. Geological Survey 2025 U.S. Quaternary Faults. https://usgs.maps.arcgis.com/apps/webappviewer/index.html?id=5a6038b3a1684561a 9b0aadf88412fcf. Wallace, W.J. 1955 A Suggested Chronology for Southern California Coastal Archaeology. Southwestern Journal of Anthropology, 11(3), pp.214-230. City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 6.0 REFERENCES Bean, Lowell John, and Charles R. Smith 1978 Gabrielino. In Handbook of North American Indians, Vol. 8, California. William C. Sturtevant, gen. ed., Robert F. Heizer, vol. ed. Washington: Smithsonian Institution. City of Rosemead 2025 About Rosemead] City of Rosemead. Cheng, Wendy 2014 A Brief History (and Geography) of the San Gabriel Valley. PBS SoCal. A Brief History (and Geography) of the San Gabriel Valley | History & Society | PBS SoCal. Historic Aerials 2025 Historic Aerial Viewer. https://www.historicaerials.com/viewer. Hudson, Travis, and Thomas C. Blackburn 1982 The Material Culture of the Chumash Interaction Sphere, Volume lll: Clothing, Ornamentation, and Grooming. Ballena Press Anthropological Papers, No. 28. Kroeber, Alfred L. 1925 Handbook of the Indians of California. Bureau of American Ethnology Bulletin No. 78. Washington D.C.: Smithsonian Institution. Reprinted in 1976, New York: Dover. SoilWeb 2025 National Resources Conservation Service Soil Survey Program website. https://casoilresource.lawr.ucdavis.edu/gmap/. Tan, S.S. 2000 Geologic Map of the El Monte 7.5-Minute Quadrangle, Los Angeles County, California. California Division of Mines and Geology. Open-File Report OFR-98-29. U.S. Geological Survey 2025 U.S. Quaternary Faults. https://usgs.maps.arcgis.com/apps/webappviewer/index.html?id=5a6038b3a1684561a 9b0aadf88412fcf. Wallace, W.J. 1955 A Suggested Chronology for Southern California Coastal Archaeology. Southwestern Journal of Anthropology, 11(3), pp.214-230. September 2025 Kimley»Horn Page | 15 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 6.0 REFERENCES Bean, Lowell John, and Charles R. Smith 1978 Gabrielino. In Handbook of North American Indians, Vol. 8, California. William C. Sturtevant, gen. ed., Robert F. Heizer, vol. ed. Washington: Smithsonian Institution. City of Rosemead 2025 About Rosemead] City of Rosemead. Cheng, Wendy 2014 A Brief History (and Geography) of the San Gabriel Valley. PBS SoCal. A Brief History (and Geography) of the San Gabriel Valley | History & Society | PBS SoCal. Historic Aerials 2025 Historic Aerial Viewer. https://www.historicaerials.com/viewer. Hudson, Travis, and Thomas C. Blackburn 1982 The Material Culture of the Chumash Interaction Sphere, Volume lll: Clothing, Ornamentation, and Grooming. Ballena Press Anthropological Papers, No. 28. Kroeber, Alfred L. 1925 Handbook of the Indians of California. Bureau of American Ethnology Bulletin No. 78. Washington D.C.: Smithsonian Institution. Reprinted in 1976, New York: Dover. SoilWeb 2025 National Resources Conservation Service Soil Survey Program website. https://casoilresource.lawr.ucdavis.edu/gmap/. Tan, S.S. 2000 Geologic Map of the El Monte 7.5-Minute Quadrangle, Los Angeles County, California. California Division of Mines and Geology. Open-File Report OFR-98-29. U.S. Geological Survey 2025 U.S. Quaternary Faults. https://usgs.maps.arcgis.com/apps/webappviewer/index.html?id=5a6038b3a1684561a 9b0aadf88412fcf. Wallace, W.J. 1955 A Suggested Chronology for Southern California Coastal Archaeology. Southwestern Journal of Anthropology, 11(3), pp.214-230. September 2025 Kimley»Horn Page | 15 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 6.0 REFERENCES Bean, Lowell John, and Charles R. Smith 1978 Gabrielino. In Handbook of North American Indians, Vol. 8, California. William C. Sturtevant, gen. ed., Robert F. Heizer, vol. ed. Washington: Smithsonian Institution. City of Rosemead 2025 About Rosemead] City of Rosemead. Cheng, Wendy 2014 A Brief History (and Geography) of the San Gabriel Valley. PBS SoCal. A Brief History (and Geography) of the San Gabriel Valley | History & Society | PBS SoCal. Historic Aerials 2025 Historic Aerial Viewer. https://www.historicaerials.com/viewer. Hudson, Travis, and Thomas C. Blackburn 1982 The Material Culture of the Chumash Interaction Sphere, Volume lll: Clothing, Ornamentation, and Grooming. Ballena Press Anthropological Papers, No. 28. Kroeber, Alfred L. 1925 Handbook of the Indians of California. Bureau of American Ethnology Bulletin No. 78. Washington D.C.: Smithsonian Institution. Reprinted in 1976, New York: Dover. SoilWeb 2025 National Resources Conservation Service Soil Survey Program website. https://casoilresource.lawr.ucdavis.edu/gmap/. Tan, S.S. 2000 Geologic Map of the El Monte 7.5-Minute Quadrangle, Los Angeles County, California. California Division of Mines and Geology. Open-File Report OFR-98-29. U.S. Geological Survey 2025 U.S. Quaternary Faults. https://usgs.maps.arcgis.com/apps/webappviewer/index.html?id=5a6038b3a1684561a 9b0aadf88412fcf. Wallace, W.J. 1955 A Suggested Chronology for Southern California Coastal Archaeology. Southwestern Journal of Anthropology, 11(3), pp.214-230. September 2025 Kimley»Horn Page | 15 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment September 2025 Page | 16 1978 Post-Pleistocene Archaeology 9,000 to 2,000 B.C. In California, edited by R. F. Heizer, pp. 25—36. Handbook of North American Indians, vol. 8, William G. Sturtevant, general editor. Smithsonian Institution, Washington, D.C. Warren, C.N. 1968 Cultural Tradition and Ecological Adaptation on the Southern California Coast. In Archaic Prehistory in the Western United States, edited by C. Irwin-Williams, pp. 1—14. Eastern New Mexico University Contributions in Anthropology 1(3):1—14. City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 1978 Post-Pleistocene Archaeology 9,000 to 2,000 B.C. In California, edited by R. F. Heizer, pp. 25—36. Handbook of North American Indians, vol. 8, William G. Sturtevant, general editor. Smithsonian Institution, Washington, D.C. Warren, C.N. 1968 Cultural Tradition and Ecological Adaptation on the Southern California Coast. In Archaic Prehistory in the Western United States, edited by C. Irwin-Williams, pp. 1—14. Eastern New Mexico University Contributions in Anthropology 1(3):1—14. September 2025 Kimley»Horn Page | 16 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 1978 Post-Pleistocene Archaeology 9,000 to 2,000 B.C. In California, edited by R. F. Heizer, pp. 25—36. Handbook of North American Indians, vol. 8, William G. Sturtevant, general editor. Smithsonian Institution, Washington, D.C. Warren, C.N. 1968 Cultural Tradition and Ecological Adaptation on the Southern California Coast. In Archaic Prehistory in the Western United States, edited by C. Irwin-Williams, pp. 1—14. Eastern New Mexico University Contributions in Anthropology 1(3):1—14. September 2025 Kimley»Horn Page | 16 City of Rosemead 1515 Walnut Grove Avenue Project Archaeological Resources Assessment 1978 Post-Pleistocene Archaeology 9,000 to 2,000 B.C. In California, edited by R. F. Heizer, pp. 25—36. Handbook of North American Indians, vol. 8, William G. Sturtevant, general editor. Smithsonian Institution, Washington, D.C. Warren, C.N. 1968 Cultural Tradition and Ecological Adaptation on the Southern California Coast. In Archaic Prehistory in the Western United States, edited by C. Irwin-Williams, pp. 1—14. Eastern New Mexico University Contributions in Anthropology 1(3):1—14. September 2025 Kimley»Horn Page | 16 Appendix A Sacred Lands File Search Results Appendix A Sacred Lands File Search Results Appendix A Sacred Lands File Search Results Appendix A Sacred Lands File Search Results STATE OF CALIFORNIA Gavin Newsom, Governor NATIVE AMERICAN HERITAGE COMMISSION Page 1 of 1 August 7, 2025 Christina Livingston Kimley-Horn and Associates, Inc. Via Email to: Christina.Livingston@kimley-horn.com Re: Rosemead 1515 Walnut Grove Project, Los Angeles County To Whom It May Concern: As requested, a search of the Native American Heritage Commission (NAHC) Sacred Lands File (SLF) was completed based on information submitted for the above referenced project. The results were positive. Please contact the Gabrieleno Band of Mission Indians – Kizh Nation and the Gabrieleno/Tongva San Gabriel Band of Mission Indians on the attached list for more information. Be aware that tribes do not always record their sacred sites in the SLF, nor are they required to do so. As such, an SLF search is not a substitute for consultation with all tribes that are traditionally and culturally affiliated with a project’s geographic area. Attached is a list of Native American tribes that are traditionally and culturally affiliated with the project’s geographic area. Please contact all of the listed tribes as they may have information about sacred sites within the project area that is not listed with the NAHC. If within two weeks of notification, a response has not been received, the Commission requests that you follow up with a telephone call or email to ensure that the project information was received. If you receive notification of a change of address or phone number from a tribe, please inform the NAHC so that we can assure that our lists contain current information. In addition to engaging in tribal consultation, you should consult the appropriate regional California Historical Research Information System (CHRIS) information center to determine whether it has information regarding the presence of recorded archaeological sites within the project area. If you have any questions or need additional information, please contact me at Andrew.Green@nahc.ca.gov. Sincerely, Andrew Green Cultural Resources Analyst Attachment CHAIRPERSON Reginald Pagaling Chumash VICE-CHAIRPERSON Buffy McQuillen Yokayo Pomo, Yuki, Nomlaki SECRETARY Isaac Bojorquez Ohlone-Costanoan PARLIAMENTARIAN Wayne Nelson Luiseño COMMISSIONER Sara Dutschke Miwok COMMISSIONER Stanley Rodriguez Kumeyaay COMMISSIONER Bennae Calac Pauma-Yuima Band of Luiseño Indians COMMISSIONER Vacant COMMISSIONER Vacant ACTING EXECUTIVE SECRETARY Michelle Carr NAHC HEADQUARTERS 1550 Harbor Boulevard Suite 100 West Sacramento, California 95691 (916) 373-3710 nahc@nahc.ca.gov CHAIRPERSON Reginald Pagaling Chumash VICE-CHAIRPERSON Buffy McQuillen Yokayo Pomo, Yuki, Nomlaki SECRETARY Isaac Bojorquez Ohlone-Cosfanoan PARLIAMENTARIAN Wayne Nelson Luiseho COMMISSIONER Sara Duischke Miwok COMMISSIONER Stanley Rodriguez Kumeyaay COMMISSIONER Bennae Calac Pauma-Yuima Band of Luisefio Indians COMMISSIONER Vacant COMMISSIONER Vacant ACTING EXECUTIVE SECRETARY Michelle Carr NAHC HEADQUARTERS 1550 Harbor Boulevard Suite 100 West Sacramento, Cdlifornia 95691 (916) 373-3710 nahc@nahc.ca.gov STATE OF CALIFORNIA Gavin Newsom, Governor NATIVE AMERICAN HERITAGE COMMISSION August 7, 2025 Christina Livingston Kimley-Horn and Associates, Inc. Via Email fo: Christina.Livingston@kimley-horn.com Re: Rosemead 1515 Walnut Grove Project, Los Angeles County To Whom It May Concern: As requested, a search of the Native American Heritage Commission (NAHC) Sacred Lands File {SLF) was completed based on information submitted for the above referenced project. The results were positive. Please contact the Gabrieleno Band of Mission Indians — Kizh Nation and the Gabrieleno/Tongva San Gabriel Band of Mission Indians on the attached list for more information. Be aware that tribes do not always record their sacred sites in the SLF, nor are they required to do so. As such, an SLF search is not a substitute for consultation with all tribes that are traditionally and culturally affiliated with a project's geographic area. Attached is a list of Native American tribes that are traditionally and culturally affiliated with the project’s geographic area. Please contact all of the listed tribes as they may have information about sacred sites within the project area that is not listed with the NAHC. If within two weeks of notification, a response has not been received, the Commission requests that you follow up with a telephone call or email to ensure that the project information was received. If you receive notification of a change of address or phone number from a tribe, please inform the NAHC so that we can assure that our lists contain current information. In addition to engaging in tribal consultation, you should consult the appropriate regional California Historical Research Information System (CHRIS) information center to determine whether it has information regarding the presence of recorded archaeological sites within the project area. If you have any questions or need additional information, please contact me at Andrew.Green@nahc.ca.gov. Sincerely, Andrew Green Cultural Resources Analyst Attachment Page 1 of 1 CHAIRPERSON Reginald Pagaling Chumash VICE-CHAIRPERSON Buffy McQuillen Yokayo Pomo, Yuki, Nomlaki SECRETARY Isaac Bojorquez Ohlone-Cosfanoan PARLIAMENTARIAN Wayne Nelson Luiseho COMMISSIONER Sara Duischke Miwok COMMISSIONER Stanley Rodriguez Kumeyaay COMMISSIONER Bennae Calac Pauma-Yuima Band of Luisefio Indians COMMISSIONER Vacant COMMISSIONER Vacant ACTING EXECUTIVE SECRETARY Michelle Carr NAHC HEADQUARTERS 1550 Harbor Boulevard Suite 100 West Sacramento, Cdlifornia 95691 (916) 373-3710 nahc@nahc.ca.gov STATE OF CALIFORNIA Gavin Newsom, Governor NATIVE AMERICAN HERITAGE COMMISSION August 7, 2025 Christina Livingston Kimley-Horn and Associates, Inc. Via Email fo: Christina.Livingston@kimley-horn.com Re: Rosemead 1515 Walnut Grove Project, Los Angeles County To Whom It May Concern: As requested, a search of the Native American Heritage Commission (NAHC) Sacred Lands File {SLF) was completed based on information submitted for the above referenced project. The results were positive. Please contact the Gabrieleno Band of Mission Indians — Kizh Nation and the Gabrieleno/Tongva San Gabriel Band of Mission Indians on the attached list for more information. Be aware that tribes do not always record their sacred sites in the SLF, nor are they required to do so. As such, an SLF search is not a substitute for consultation with all tribes that are traditionally and culturally affiliated with a project's geographic area. Attached is a list of Native American tribes that are traditionally and culturally affiliated with the project’s geographic area. Please contact all of the listed tribes as they may have information about sacred sites within the project area that is not listed with the NAHC. If within two weeks of notification, a response has not been received, the Commission requests that you follow up with a telephone call or email to ensure that the project information was received. If you receive notification of a change of address or phone number from a tribe, please inform the NAHC so that we can assure that our lists contain current information. In addition to engaging in tribal consultation, you should consult the appropriate regional California Historical Research Information System (CHRIS) information center to determine whether it has information regarding the presence of recorded archaeological sites within the project area. If you have any questions or need additional information, please contact me at Andrew.Green@nahc.ca.gov. Sincerely, Andrew Green Cultural Resources Analyst Attachment Page 1 of 1 CHAIRPERSON Reginald Pagaling Chumash VICE-CHAIRPERSON Buffy McQuillen Yokayo Pomo, Yuki, Nomlaki SECRETARY Isaac Bojorquez Ohlone-Cosfanoan PARLIAMENTARIAN Wayne Nelson Luiseho COMMISSIONER Sara Duischke Miwok COMMISSIONER Stanley Rodriguez Kumeyaay COMMISSIONER Bennae Calac Pauma-Yuima Band of Luisefio Indians COMMISSIONER Vacant COMMISSIONER Vacant ACTING EXECUTIVE SECRETARY Michelle Carr NAHC HEADQUARTERS 1550 Harbor Boulevard Suite 100 West Sacramento, Cdlifornia 95691 (916) 373-3710 nahc@nahc.ca.gov STATE OF CALIFORNIA Gavin Newsom, Governor NATIVE AMERICAN HERITAGE COMMISSION August 7, 2025 Christina Livingston Kimley-Horn and Associates, Inc. Via Email fo: Christina.Livingston@kimley-horn.com Re: Rosemead 1515 Walnut Grove Project, Los Angeles County To Whom It May Concern: As requested, a search of the Native American Heritage Commission (NAHC) Sacred Lands File {SLF) was completed based on information submitted for the above referenced project. The results were positive. Please contact the Gabrieleno Band of Mission Indians — Kizh Nation and the Gabrieleno/Tongva San Gabriel Band of Mission Indians on the attached list for more information. Be aware that tribes do not always record their sacred sites in the SLF, nor are they required to do so. As such, an SLF search is not a substitute for consultation with all tribes that are traditionally and culturally affiliated with a project's geographic area. Attached is a list of Native American tribes that are traditionally and culturally affiliated with the project’s geographic area. Please contact all of the listed tribes as they may have information about sacred sites within the project area that is not listed with the NAHC. If within two weeks of notification, a response has not been received, the Commission requests that you follow up with a telephone call or email to ensure that the project information was received. If you receive notification of a change of address or phone number from a tribe, please inform the NAHC so that we can assure that our lists contain current information. In addition to engaging in tribal consultation, you should consult the appropriate regional California Historical Research Information System (CHRIS) information center to determine whether it has information regarding the presence of recorded archaeological sites within the project area. If you have any questions or need additional information, please contact me at Andrew.Green@nahc.ca.gov. Sincerely, Andrew Green Cultural Resources Analyst Attachment Page 1 of 1 Tribe Name Fed (F)Non-Fed (N)Contact Person Contact Address Phone #Fax #Email Address Cultural Affiliation Last Updated Cahuilla Band of Indians F BobbyRay Esparza, Cultural Director 52701 CA Highway 371 Anza, CA, 92539 (951) 763-5549 besparza@cahuilla-nsn.gov Cahuilla 6/28/2023 Cahuilla Band of Indians F Anthony Madrigal, Tribal Historic Preservation Officer 52701 CA Highway 371 Anza, CA, 92539 (951) 763-5549 anthonymad2002@gmail.com Cahuilla 6/28/2023 Cahuilla Band of Indians F Erica Schenk, Chairperson 52701 CA Highway 371 Anza, CA, 92539 (951) 590-0942 (951) 763-2808 chair@cahuilla-nsn.gov Cahuilla 2/1/2024 Gabrieleno Band of Mission Indians - Kizh Nation N Christina Swindall Martinez, Secretary P.O. Box 393 Covina, CA, 91723 (844) 390-0787 admin@gabrielenoindians.org Gabrieleno 8/18/2023 Gabrieleno Band of Mission Indians - Kizh Nation N Andrew Salas, Chairperson P.O. Box 393 Covina, CA, 91723 (844) 390-0787 admin@gabrielenoindians.org Gabrieleno 8/18/2023 Gabrieleno/Tongva San Gabriel Band of Mission Indians N Anthony Morales, Chairperson P.O. Box 693 San Gabriel, CA, 91778 (626) 483-3564 (626) 286-1262 GTTribalcouncil@aol.com Gabrieleno 12/4/2023 Gabrielino Tongva Indians of California Tribal Council N Robert Dorame, Chairperson P.O. Box 490 Bellflower, CA, 90707 (562) 761-6417 (562) 761-6417 gtongva@gmail.com Gabrielino 3/16/2023 Gabrielino Tongva Indians of California Tribal Council N Christina Conley, Cultural Resource Administrator P.O. Box 941078 Simi Valley, CA, 93094 (626) 407-8761 christina.marsden@alumni.usc.edu Gabrielino 3/16/2023 Gabrielino/Tongva Nation N Sandonne Goad, Chairperson 106 1/2 Judge John Aiso St., #231 Los Angeles, CA, 90012 (951) 807-0479 sgoad@gabrielino-tongva.com Gabrielino 3/28/2023 Gabrielino-Tongva Tribe N Charles Alvarez, Chairperson 23454 Vanowen Street West Hills, CA, 91307 (310) 403-6048 Chavez1956metro@gmail.com Gabrielino 5/30/2023 Gabrielino-Tongva Tribe N Sam Dunlap, Cultural Resource Director P.O. Box 3919 Seal Beach, CA, 90740 (909) 262-9351 tongvatcr@gmail.com Gabrielino 5/30/2023 Santa Rosa Band of Cahuilla Indians F Steven Estrada, Tribal Chairman P.O. Box 391820 Anza, CA, 92539 (951) 659-2700 (951) 659-2228 sestrada@santarosa-nsn.gov Cahuilla 4/8/2024 Santa Rosa Band of Cahuilla Indians F Mercedes Estrada, Cultural Director P.O. Box 391820 Anza, CA, 92539 (951) 659-2700 (951) 659-2228 mestrada@santarosa-nsn.gov Cahuilla 5/21/2025 Santa Rosa Band of Cahuilla Indians F Vanessa Minott, Tribal Administrator P.O. Box 391820 Anza, CA, 92539 (951) 659-2700 (951) 659-2228 vminott@santarosa-nsn.gov Cahuilla 4/8/2024 Soboba Band of Luiseno Indians F Jessica Valdez, Cultural Resource Specialist P.O. Box 487 San Jacinto, CA, 92581 (951) 663-6261 (951) 654-4198 jvaldez@soboba-nsn.gov CahuillaLuiseno 7/14/2023 Soboba Band of Luiseno Indians F Joseph Ontiveros, Tribal Historic Preservation Officer P.O. Box 487 San Jacinto, CA, 92581 (951) 663-5279 (951) 654-4198 jontiveros@soboba-nsn.gov CahuillaLuiseno 7/14/2023 Imperial,Los Angeles,Orange,Riverside,San Bernardino,San Diego Imperial,Los Angeles,Orange,Riverside,San Bernardino,San Diego Imperial,Los Angeles,Orange,Riverside,San Bernardino,San Diego This list is current only as of the date of this document. Distribution of this list does not relieve any person of statutory responsibility as defined in Section 7050.5 of the Health and Safety Code, Section 5097.94 of the Public Resources Code and Section 5097.98 of the Public Resources Code. This list is only applicable for contacting local Native Americans with regard to cultural resources assessment for the proposed Rosemead 1515 Walnut Grove Project, Los Angeles County. Record: PROJ-2025-004382Report Type: List of TribesCounties: Los AngelesNAHC Group: All Los Angeles,Orange,Riverside,San Bernardino,Santa Barbara,Ventura Los Angeles,Orange,Riverside,San Bernardino,Santa Barbara,Ventura Los Angeles,Orange,Riverside,San Bernardino,Santa Barbara,Ventura Imperial,Los Angeles,Orange,Riverside,San Bernardino,San Diego Imperial,Los Angeles,Orange,Riverside,San Bernardino,San Diego Los Angeles,Orange,Riverside,San Bernardino,Santa Barbara,Ventura Los Angeles,Orange,Riverside,San Bernardino,Santa Barbara,Ventura Los Angeles,Orange,Riverside,San Bernardino,Santa Barbara,Ventura Los Angeles,Orange,Riverside,San Bernardino,Santa Barbara,Ventura Los Angeles,Orange,Riverside,San Bernardino,Santa Barbara,Ventura Native American Heritage CommissionNative American Contact ListLos Angeles County8/7/2025 Counties Imperial,Los Angeles,Orange,Riverside,San Bernardino,San Diego Imperial,Los Angeles,Orange,Riverside,San Bernardino,San Diego Imperial,Los Angeles,Orange,Riverside,San Bernardino,San Diego 08/07/2025 11:56 AM 1 of 1 Native American Heritage Commission Native American Contact List Los Angeles County81712025 Cahuilla Band of Indians BobbyRay Esparza, Cultural 52701 CA Highway 371 (951) 763-5549 besparza@cahuilla-nsn.gov Cahuilla Imperial,Los Angeles,Or ide,S+Director Anza, CA, 92539 Bemardino,San Diego Cahuilla Band of Indians [Anthony Madrigal, Tribal Historic |52701 CA Highway 371 (951) 763.5549 anthonymad2002@gmailcom |Cahuilla Imperial,LosAngeles,Orange,Riverside,San 62812023Preservation Officer Anza, CA, 92539 Bemardino,San Diego Cahuilia Band of Indians Erica Schenk, Chairperson 52701 CA Highway 371 (951) 590-0942 (951) 763-2808 chair@cahuila-nsn.gov Cahwila Imperial,LosAngeles,Orange,Riverside,San 21112024Anza, CA, 92539 Bemardino,San Diego Gabricleno Band of Mission Indians - Kizh Christina Swindall Martinez, P.O. Box 393 (844) 390-0787 org Los Angeles,Orange,Riverside,San 8/18/2023] Nation Secretary Covina, CA, 81723 Bemardino, Santa Barbara, Ventura Gabrieleno Band of Mission Indians - Kizh Andrew Salas, Chairperson P.O. Box 393 (844) 390-0787 org Los Angeles,Orange,Riverside,San 8/18/2023] Nation Covina, CA, 81723 Bemardino, Santa Barbara, Ventura gva San Gabrial Band of ‘Anthony Morales, Chairperson |P.O. Box 693 (626) 483-3564 (626) 286-1262 GTTH com Los Angeles,Orange,Riverside,San 121412023) Mission Indians San Gabriel, CA, 91778 Bemardino, Santa Barbara, Ventura GabrielinoTongva Indians of California Robert Dorame, Chairperson P.O. Box 490 (562) 761-6417 (562) 761-6417 com Los Angeles,Orange,Riverside,San 3/16/2023]Tribal Council Belflower, CA, 90707 Santa Barbara Ventura GabrielinoTongva Indians of California Christina Conley, Cultural P.O. Box 541078 (626) 407-8761 christina. usc.ed Los Angeles,Orange,Riverside,San 31672023] Tribal Council Resource Administrator Simi Valley, CA, 93004 u Bemardino, Santa Barbara, Ventura Gabrielino/Tongva Nation Sandonne Goad, Chairperson [106 1/2 JudgeJohn Aiso St, (951) 807-0479 tongva.com Los Angeles,Orange,Riverside,San 302812023] #231 Bemardino, Santa Barbara, VenturaLos Angeles, CA, 90012 Gabriclino-Tongva Tribe Charies Alvarez, Chairperson 23454 Vanowen Street (310) 403-6048 Chavez1956metro@gmal.com |Gabrielino Los Angeles,Orange,Riverside,San 53012023] West Hills, CA, 91307 Bemardino, Santa Barbara, Ventura Gabrielino-Tongva Tribe Sam Dunlap, Cultural Resource |P.O. Box 3819 (909) 262.9351 com Los Angeles,Orange,Riverside,San 5/30/2023] Director Seal Beach, CA, 90740 Bemardino, Santa Barbara, Ventura ‘Santa Rosa Band of Cahuilla Indians, Steven Estrada, Tribal Chairman |P.O. Box 381820 (951) 659-2700 (951) 6592228 sestrada@santarosansngov |Camila Imperial,Los Angeles,Orange,Riverside,San 4812024)Anza, CA, 92539 Bemardino,San Diego Santa Rosa Band of Cahuilla Indians Mercedes Estrada, Cultural P.O. Box 391820 (951) 659-2700 (951) 659-2228 mestrada@santarosansngov |Camila Imperial,Los Angeles,Orange,Riverside,San 52112025]Director Anza, CA, 92539 Bemardino,San Diego ‘Santa Rosa Band of Cahuilla Indians, Vanessa Minott, Tribal P.O. Box 391820 (951) 659-2700 (951) 6592228 vminoli@santarosa sn.gov Cahilla Imperial,Los Angeles,Orange,Riverside,San 4812024)Administrator Anza, CA, 92539 Bemardino,San Diego ‘Soboba Band of Luiseno Indians Jessica Valdez, Cultural Resource |P.O. Box 487 (951) 663-6261 (951) 654-4198 9 Cahwila Imperial,Los Angeles,Orange,Riverside,San 71412023]Specialist San Jacinto, CA, 92581 Luiseno Bemardino,San Diego ‘Soboba Band of Luiseno Indians Joseph Ontiveros, Tribal Historic |P.O. Box 487 (951) 663-5279 (951) 654-4198 ontiveros@soboba nsn.gov Cahilla Imperial,Los Angeles,Orange,Riverside,San 711412023]Preservation Officer San Jacinto, CA, 92581 Luiseno Bemardino,San Diego This list is current onlyas of the dale of this document. Distribution of this list does not relieve any person of statutory responsibility as defined in Section 7050.5 of theHealth and Safety Code, Section 509794 of the Public Resources Code and Section 509798 of the Public Resources Code. This list is only applicable for contacting local Native Americans with regard to cultural resources assessment for the proposed Rosemead 1515 Walnut Grove Project, Los Angeles County. 08/07/2025 11:56 AM 10f1 Record: PROJ-2025-004382Report Type: List of TribesCounties: Las Angeles NAHC Group: All Native American Heritage Commission Native American Contact List Los Angeles County81712025 Cahuilla Band of Indians BobbyRay Esparza, Cultural 52701 CA Highway 371 (951) 763-5549 besparza@cahuilla-nsn.gov Cahuilla Imperial,Los Angeles,Or ide,S+Director Anza, CA, 92539 Bemardino,San Diego Cahuilla Band of Indians [Anthony Madrigal, Tribal Historic |52701 CA Highway 371 (951) 763.5549 anthonymad2002@gmailcom |Cahuilla Imperial,LosAngeles,Orange,Riverside,San 62812023Preservation Officer Anza, CA, 92539 Bemardino,San Diego Cahuilia Band of Indians Erica Schenk, Chairperson 52701 CA Highway 371 (951) 590-0942 (951) 763-2808 chair@cahuila-nsn.gov Cahwila Imperial,LosAngeles,Orange,Riverside,San 21112024Anza, CA, 92539 Bemardino,San Diego Gabricleno Band of Mission Indians - Kizh Christina Swindall Martinez, P.O. Box 393 (844) 390-0787 org Los Angeles,Orange,Riverside,San 8/18/2023] Nation Secretary Covina, CA, 81723 Bemardino, Santa Barbara, Ventura Gabrieleno Band of Mission Indians - Kizh Andrew Salas, Chairperson P.O. Box 393 (844) 390-0787 org Los Angeles,Orange,Riverside,San 8/18/2023] Nation Covina, CA, 81723 Bemardino, Santa Barbara, Ventura gva San Gabrial Band of ‘Anthony Morales, Chairperson |P.O. Box 693 (626) 483-3564 (626) 286-1262 GTTH com Los Angeles,Orange,Riverside,San 121412023) Mission Indians San Gabriel, CA, 91778 Bemardino, Santa Barbara, Ventura GabrielinoTongva Indians of California Robert Dorame, Chairperson P.O. Box 490 (562) 761-6417 (562) 761-6417 com Los Angeles,Orange,Riverside,San 3/16/2023]Tribal Council Belflower, CA, 90707 Santa Barbara Ventura GabrielinoTongva Indians of California Christina Conley, Cultural P.O. Box 541078 (626) 407-8761 christina. usc.ed Los Angeles,Orange,Riverside,San 31672023] Tribal Council Resource Administrator Simi Valley, CA, 93004 u Bemardino, Santa Barbara, Ventura Gabrielino/Tongva Nation Sandonne Goad, Chairperson [106 1/2 JudgeJohn Aiso St, (951) 807-0479 tongva.com Los Angeles,Orange,Riverside,San 302812023] #231 Bemardino, Santa Barbara, VenturaLos Angeles, CA, 90012 Gabriclino-Tongva Tribe Charies Alvarez, Chairperson 23454 Vanowen Street (310) 403-6048 Chavez1956metro@gmal.com |Gabrielino Los Angeles,Orange,Riverside,San 53012023] West Hills, CA, 91307 Bemardino, Santa Barbara, Ventura Gabrielino-Tongva Tribe Sam Dunlap, Cultural Resource |P.O. Box 3819 (909) 262.9351 com Los Angeles,Orange,Riverside,San 5/30/2023] Director Seal Beach, CA, 90740 Bemardino, Santa Barbara, Ventura ‘Santa Rosa Band of Cahuilla Indians, Steven Estrada, Tribal Chairman |P.O. Box 381820 (951) 659-2700 (951) 6592228 sestrada@santarosansngov |Camila Imperial,Los Angeles,Orange,Riverside,San 4812024)Anza, CA, 92539 Bemardino,San Diego Santa Rosa Band of Cahuilla Indians Mercedes Estrada, Cultural P.O. Box 391820 (951) 659-2700 (951) 659-2228 mestrada@santarosansngov |Camila Imperial,Los Angeles,Orange,Riverside,San 52112025]Director Anza, CA, 92539 Bemardino,San Diego ‘Santa Rosa Band of Cahuilla Indians, Vanessa Minott, Tribal P.O. Box 391820 (951) 659-2700 (951) 6592228 vminoli@santarosa sn.gov Cahilla Imperial,Los Angeles,Orange,Riverside,San 4812024)Administrator Anza, CA, 92539 Bemardino,San Diego ‘Soboba Band of Luiseno Indians Jessica Valdez, Cultural Resource |P.O. Box 487 (951) 663-6261 (951) 654-4198 9 Cahwila Imperial,Los Angeles,Orange,Riverside,San 71412023]Specialist San Jacinto, CA, 92581 Luiseno Bemardino,San Diego ‘Soboba Band of Luiseno Indians Joseph Ontiveros, Tribal Historic |P.O. Box 487 (951) 663-5279 (951) 654-4198 ontiveros@soboba nsn.gov Cahilla Imperial,Los Angeles,Orange,Riverside,San 711412023]Preservation Officer San Jacinto, CA, 92581 Luiseno Bemardino,San Diego This list is current onlyas of the dale of this document. Distribution of this list does not relieve any person of statutory responsibility as defined in Section 7050.5 of theHealth and Safety Code, Section 509794 of the Public Resources Code and Section 509798 of the Public Resources Code. This list is only applicable for contacting local Native Americans with regard to cultural resources assessment for the proposed Rosemead 1515 Walnut Grove Project, Los Angeles County. 08/07/2025 11:56 AM 10f1 Record: PROJ-2025-004382Report Type: List of TribesCounties: Las Angeles NAHC Group: All Native American Heritage Commission Native American Contact List Los Angeles County81712025 Cahuilla Band of Indians BobbyRay Esparza, Cultural 52701 CA Highway 371 (951) 763-5549 besparza@cahuilla-nsn.gov Cahuilla Imperial,Los Angeles,Or ide,S+Director Anza, CA, 92539 Bemardino,San Diego Cahuilla Band of Indians [Anthony Madrigal, Tribal Historic |52701 CA Highway 371 (951) 763.5549 anthonymad2002@gmailcom |Cahuilla Imperial,LosAngeles,Orange,Riverside,San 62812023Preservation Officer Anza, CA, 92539 Bemardino,San Diego Cahuilia Band of Indians Erica Schenk, Chairperson 52701 CA Highway 371 (951) 590-0942 (951) 763-2808 chair@cahuila-nsn.gov Cahwila Imperial,LosAngeles,Orange,Riverside,San 21112024Anza, CA, 92539 Bemardino,San Diego Gabricleno Band of Mission Indians - Kizh Christina Swindall Martinez, P.O. Box 393 (844) 390-0787 org Los Angeles,Orange,Riverside,San 8/18/2023] Nation Secretary Covina, CA, 81723 Bemardino, Santa Barbara, Ventura Gabrieleno Band of Mission Indians - Kizh Andrew Salas, Chairperson P.O. Box 393 (844) 390-0787 org Los Angeles,Orange,Riverside,San 8/18/2023] Nation Covina, CA, 81723 Bemardino, Santa Barbara, Ventura gva San Gabrial Band of ‘Anthony Morales, Chairperson |P.O. Box 693 (626) 483-3564 (626) 286-1262 GTTH com Los Angeles,Orange,Riverside,San 121412023) Mission Indians San Gabriel, CA, 91778 Bemardino, Santa Barbara, Ventura GabrielinoTongva Indians of California Robert Dorame, Chairperson P.O. Box 490 (562) 761-6417 (562) 761-6417 com Los Angeles,Orange,Riverside,San 3/16/2023]Tribal Council Belflower, CA, 90707 Santa Barbara Ventura GabrielinoTongva Indians of California Christina Conley, Cultural P.O. Box 541078 (626) 407-8761 christina. usc.ed Los Angeles,Orange,Riverside,San 31672023] Tribal Council Resource Administrator Simi Valley, CA, 93004 u Bemardino, Santa Barbara, Ventura Gabrielino/Tongva Nation Sandonne Goad, Chairperson [106 1/2 JudgeJohn Aiso St, (951) 807-0479 tongva.com Los Angeles,Orange,Riverside,San 302812023] #231 Bemardino, Santa Barbara, VenturaLos Angeles, CA, 90012 Gabriclino-Tongva Tribe Charies Alvarez, Chairperson 23454 Vanowen Street (310) 403-6048 Chavez1956metro@gmal.com |Gabrielino Los Angeles,Orange,Riverside,San 53012023] West Hills, CA, 91307 Bemardino, Santa Barbara, Ventura Gabrielino-Tongva Tribe Sam Dunlap, Cultural Resource |P.O. Box 3819 (909) 262.9351 com Los Angeles,Orange,Riverside,San 5/30/2023] Director Seal Beach, CA, 90740 Bemardino, Santa Barbara, Ventura ‘Santa Rosa Band of Cahuilla Indians, Steven Estrada, Tribal Chairman |P.O. Box 381820 (951) 659-2700 (951) 6592228 sestrada@santarosansngov |Camila Imperial,Los Angeles,Orange,Riverside,San 4812024)Anza, CA, 92539 Bemardino,San Diego Santa Rosa Band of Cahuilla Indians Mercedes Estrada, Cultural P.O. Box 391820 (951) 659-2700 (951) 659-2228 mestrada@santarosansngov |Camila Imperial,Los Angeles,Orange,Riverside,San 52112025]Director Anza, CA, 92539 Bemardino,San Diego ‘Santa Rosa Band of Cahuilla Indians, Vanessa Minott, Tribal P.O. Box 391820 (951) 659-2700 (951) 6592228 vminoli@santarosa sn.gov Cahilla Imperial,Los Angeles,Orange,Riverside,San 4812024)Administrator Anza, CA, 92539 Bemardino,San Diego ‘Soboba Band of Luiseno Indians Jessica Valdez, Cultural Resource |P.O. Box 487 (951) 663-6261 (951) 654-4198 9 Cahwila Imperial,Los Angeles,Orange,Riverside,San 71412023]Specialist San Jacinto, CA, 92581 Luiseno Bemardino,San Diego ‘Soboba Band of Luiseno Indians Joseph Ontiveros, Tribal Historic |P.O. Box 487 (951) 663-5279 (951) 654-4198 ontiveros@soboba nsn.gov Cahilla Imperial,Los Angeles,Orange,Riverside,San 711412023]Preservation Officer San Jacinto, CA, 92581 Luiseno Bemardino,San Diego This list is current onlyas of the dale of this document. Distribution of this list does not relieve any person of statutory responsibility as defined in Section 7050.5 of theHealth and Safety Code, Section 509794 of the Public Resources Code and Section 509798 of the Public Resources Code. This list is only applicable for contacting local Native Americans with regard to cultural resources assessment for the proposed Rosemead 1515 Walnut Grove Project, Los Angeles County. 08/07/2025 11:56 AM 10f1 Record: PROJ-2025-004382Report Type: List of TribesCounties: Las Angeles NAHC Group: All