CC - Item 6A - San Gabriel Valley Superfund Site, El monte Operable Unit- West Side, Shallow Zone Expansion ProjectROSEMEAD CITY COUNCIL
STAFF REPORT
TO: THE HONORABLE MAYOR AND CITY COUNCIL
FROM: GLORIA MOLLEDA, CITY MANAGER ,� .
DATE: MAY 26, 2020
SUBJECT: SAN GABRIEL VALLEY SUPERFUND SITE, EL MONTE OPERABLE
UNIT — WEST SIDE, SHALLOW ZONE EXPANSION PROJECT
SUMMARY
The San Gabriel Valley Superfund site is divided into eight sub -areas or operable units. Of these,
the El Monte Operable Unit (EMOU) is divided into two portions, based on the responsible
parties involved in their remediation: the west and east sides of the EMOU. The West Side
EMOU is situated within the city boundaries of the City of El Monte, the City of Temple City
and the City of Rosemead. Within this portion of the EMOU, groundwater contains elevated
concentrations of volatile organic compounds (VOCs), such as trichloroethene (TCE) and
tetrachloroethene (PCE), perchlorate, hexavalent chromium, and 1,4 -dioxane.
Over the past 25 -years, led by Hermetic Seal, a subsidiary of Ametek, there has been a
significant amount of site investigation, sampling, planning, design, and construction to contain
contaminated groundwater. These efforts culminated in 2012 when construction of a
groundwater treatment system (GWTS) was completed and began operation. The GWTS
includes a series of pumping extraction wells located to the west of the areas where
contamination was released. Groundwater is pumped in buried pipes (located in the right-of-
way) to above -ground treatment equipment that is located at the Ametek facility on Temple City
Blvd. The treatment equipment removes contamination from the groundwater and then
discharges the treated water into Eaton Wash in compliance with a National Pollution Discharge
Elimination System (NPDES) permit issued by the Los Angeles Regional Water Quality Control
Board.
DISCUSSION
When the system was first installed in 2012, groundwater flowed from east to west, so that
contamination from the former release areas flowed to the extraction wells. The extraction wells
would capture and contain the impacted groundwater and prevent it from migrating
downgradient further west. However, the elevation of the groundwater table at the site has
dropped over the years, perhaps as a result of drought and less recharge into the aquifer
AGENDA ITEM 6.A
City Council Meeting
May 26, 2020
Page 2 of 3
compared to the amount removed. As the groundwater table has dropped, the direction of
groundwater flow has also changed. Instead of flowing east to west, groundwater now flows
from northwest to southeast, resulting in the contaminated groundwater flowing in a different
direction than when the system was designed and installed.
Because of this, additional groundwater extraction wells are needed to reestablish the
containment of contaminated groundwater. Several additional extraction wells have already been
installed in both Rosemead and El Monte for this purpose, but the wells have not yet been
connected to the existing GWTS. The following work is needed to expand the GWTS to capture
the contaminated groundwater. Locations of all proposed infrastructure have been selected to
minimize the potential impacts to the community:
- New flush -mounted precast concrete vaults at the new wells: these will be installed in the
City ROW, over the top of the existing wells. These locations were approved by the cities
and fall in parking lanes where access can be performed safely and without impacting
traffic; and
- New trenching (water pipes and electrical conduit): trenching will be conducted to
connect the piping to existing pipes or the GWTP at Ametek's facility; and
- New electrical vaults/handholes (for pulling wire): new electrical handholes will be
needed to pull wire through the planned conduit. These will be located alongside the
piping and conduit; and
- New electrical power drop and pedestal (via SoCal Edison): one electrical power drop is
planned on the east side of Rio Hondo Street, just south of Valley Blvd. This location is
in front of the commercial lot (not a residence) and was selected to minimize the impact
on pedestrians (i.e. on a wide sidewalk); and
- Two new above -ground control panels for controlling the extraction wells: two above-
ground control panels, similar to the one previously installed near the intersection of
Arica Ave and Rose St or at the end of Abilene St east of Temple City, are planned.
Control panels will be made as short and small as possible.
o One will be installed at the same location as the new power drop
o The other is planned on Lorica St, east of Temple City Blvd, on the north side of
the cul de sac in front of the commercial lot. This is also not in front of a
residence or in a place where it will restrict sidewalk width.
Design drawings showing the extent of the work have been prepared and submitted to EPA for
review (and to the City of Rosemead public works staff). Additional drawings with more detail
are being developed for EPA approval. Following EPA approval, the drawings will be submitted
for plan check by the Cities of Rosemead and El Monte. Once approved by the cities, the project
staff will work with the EPA and cities to implement this project. As with the installation of the
original GWTS, public outreach will be a significant focus to minimize the potential impact on
the community.
City Council Meeting
May 26, 2020
Page 3 of 3
STAFF RECOMMENDATION
It is recommended that the City Council:
1. Review and file this information.
FISCAL IMPACT
There will be no fiscal impact.
STRATEGIC PLAN IMPACT
Strategy 3: Continue efforts to enhance the condition and general appearance of the City's
public infrastructure and the public right-of-way.
PUBLIC NOTICE PROCESS
This item has been noticed through the regular agenda notification process.
Prepared By:
Michael Ackerman, P.E., City Engineer
Submitted By:
of Public Works
Attachment A: Preliminary Pipeline Location Map, El Monte Operable Unit, Rosemead
Attachment A
Preliminary Pipeline Location Map
El Monte Operable Unit, Rosemead
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West Side EI Monte
Operable Unit
Groundwater Remedy
Design Update
City of Rosemead
City Council Meeting
May 26, 2020
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Agenda
• Introductions
• Meeting Objectives
• Project Overview
• 30% Design Review
• Community Involvement
• Schedule
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Meeting Objectives
• Inform City Council on the Project Scope of Work
• Inform City Council on Project Plan and Schedule
• Answer Questions
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Project Overview - San Gabriel Valley Superfund Sites
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Area 4 Remedial Inve,"ation
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Project Overview (2) - EI Monte Operable Unit
(EMOU)
• 1999 - Interim Record of Decision (Cleanup Plan)
— Prevent exposure of the public to contaminated
groundwater;
— Inhibit contaminant migration from the more highly
contaminated portions of the aquifer to the less
contaminated areas or depths;
— Reduce the impact of continued contaminant migration
on water supply wells; and,
— Protect future uses of less contaminated and
uncontaminated areas
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Project Overview (3) — EMOU
• Set performance based criteria to assess
whether the remedial action is preventing
groundwater migration in both shallow and
deep zones.
• EPA modified the 1999 Interim ROD in the
2002 ESD to address 1,4 -dioxane,
perchlorate, hexavalent chromium, and N-
nitrosodimethylamine (NDMA).
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Project Overview (4) —
Implement EMOU
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PRPs' Obligations to
Interim Remedy
• All work is being conducted pursuant to
enforceable Consent Decree signed in 2004
that requires the West Side and East Side
Performing Settling Defendants to design,
construct, operate, maintain, monitor, and
evaluate their respective remedial actions
• EPA is the lead agency for the remedial
action
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Project Overview (5) - Current Status
• All municipal supply wells within the EMOU
serve drinking water that meet both state and
federal requirements
• Four independent groundwater extraction and
treatment systems are constructed and
operating.
• Treated water from the two EMOU Deep
Zone systems is used for municipal supply
• Groundwater monitoring programs in place
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Project Overview (6) - Current Status
• Hydraulic control/containment is not being
achieved for the West Side Shallow Zone and
Deep Zone Remedy
• EPA has directed the WSPSD to take
additional response actions to establish
groundwater containment to meet the RAOs
of the interim remedy
• EPA continued coordination with the State on
source property identification, investigation,
and remediation within the EMOU 9
Project Overview (7) -
(EMOU) —
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EI Monte Operable Unit
West Side
• Shallow groundwater treatment system installed and started in
2012
— Extracts impacted groundwater
— Removes contaminants
— Discharges treated water to surface water (Eaton Wash)
• Drop in groundwater basin water levels resulted in change to
groundwater flow direction
• Additional groundwater extraction necessary to prevent
contaminant migration and protect drinking water supply
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Project Overview (8) — West Side EMOU Remedy
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Project Overview (9) — West Side EMOU
• In the City of Rosemead Right -of -Ways (ROWs)
— New shallow zone extraction wells (installed)
— New flush -mounted vaults and electrical handholes
— New trenching (pipes and conduit)
— New power drops and pedestal (via SoCal Edison)
— Two new above -ground control panels
• Treatment Plant Improvements
— Minor improvements
— Treatment facility at Hermetic Seal/Ametek facility on
Temple City Blvd.
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West Side EMOU Shallow Design
Modifications (1)
• 30% Design Drawings and Basis of Design
Report submitted to City of Rosemead Staff
• February 26,
Meeting with
— Chris Daste
2020 Pre -Permit Design
City of Rosemead Staff
— Lily Valenzuela
— Michael Ackerman
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West Side EMOU Shallow Design
Modifications (2)
• Construction will Involve Trenching and
Electrical Equipment Installation including
Extraction Well Control Panels (EWCPs) for
Two Shallow Zone Extraction Wells (EW):
— EWCP-3 on Rio Hondo Avenue, south of Valley
Boulevard and near EW31 on Steele Street,
— EWCP-4 on Lorica Street, near EW28
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EWCP3 and EW31 Locations
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EMOU Boundary
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Groundwater Treatment Plant
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EW26 EW27
West Side and East Site EMOU
EW31
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Bridge Crossing
— Existing Pipeline
EWCP-3
Over Eaton Wash
— New Pipeline (Preliminary)
and EW31
Interpreted Trichloroethene,
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Water Table Interval)
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Water Table Interval)
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Pre -Permit Design Meeting Summary for
EWCP3
• City of Rosemead staff and the West Side
EMOU PRP agreed that the proposed
EWCP3 is acceptable, given the lot on the
southeast corner of Rio Hondo Avenue and
Valley Boulevard in being developed with a
new commercial building.
16
EWCP4 and EW28 Locations
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Legena
EMOU Boundary
Groundwater Treatment Plant
Baldwin Avenue Boundary between
West Side and East Site EMOU
Existing Pipeline
— New Pipeline (Preliminary)
Interpreted Trichloroethene,
10X MCL (Shallow Zone,
Water Table Interval)
Extraction Well (Shallow Zone,
Water Table Interval)
a RA Extraction Well (Upper Deep Zone,
160- to 190 -foot depth interval)
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30% Design Review — Pre -Permit Design
Meeting Summary for EWCP4
• City of Rosemead staff and the West Side
EMOU PRP agreed to move EWCP4 to near
end of Temple City Boulevard in front of the
commercial lot, east of the apron entrance for
the commercial yard on the north side of the
street to avoid the residence at the originally
proposed location.
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30% Design Review — Pre -Permit Design
Meeting Summary for Community Involvement
• Public Outreach is Important to City of Rosemead,
EPA, and the WSPSD
• Above -ground Equipment Installation Only in
Commercial/Industrial Areas
• Accommodation for Residents on Lorica Street
Needed for the EW28 Location
• Weekly Project Status Updates to be provided to
EPA and the City of Rosemead
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30% Design Review — Pre -Permit Design
Meeting Summary for Community Involvement
• City staff requested a Workshop with the City
Council prior to a City Council Meeting to
Present the Project and Community Aspects
• EPA and the WSPSD will coordinate to
prepare and distribute community notification
fliers in multiple languages
20
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30% Design Review — Pre -Permit Design
Meeting Summary for Community Involvement
• EPA will go Door -to -Door for Community
Notification per COVID-19 Guidelines
• The WSPSD/CDM Smith will:
— Procure Encroachment Permits from the City of
Rosemead
— Prepare and submit Traffic Control Plans (TCPs)
— Conduct traffic control during construction per the
TCPs
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Path Forward
• Completion of 60% Design due to EPA on June 5,
2020
• EPA Review and Approval (expected in August 2020)
• Drawing Plan Check
• Public Outreach (14 days prior to start)
• Southern California Edison Design
• Contractor Bidding and Procurement
• Permitting
• Construction (fall 2020)
• SCE Energization
• Startup (late 2021)
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SAN GABRIEL VALLEY AREA 1 SUPERFUND SITE
COMMUNITY INVOLVEMENT PLAN
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Raymond Chavira
EPA Remedial Project Manager
(415) 947-4218
Chavira. Raymond(c�epa.gov
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