HomeMy WebLinkAboutAgenda Report - August 19, 2020 C-04AGENDA ITEM c-4
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AGENDA TITLE:
MEETING DATE:
PREPARED BY:
Approve Plans and Specifications and Authorize Advertisement for Bids for Central
Plume PCE/TCE Groundwater and Soil Vapor Extraction System
Decommissioning and Removal
August 19,2020
Public Works Director
RECOMMENDED ACTION Approve plans and specifications and authorize advertisement for
bids for Central Plume PCE/TCE Groundwater and SoilVapor
Extraction System Decommissioning and Removal.
BACKGROUND INFORMATION: Historical practices have resulted in the contamination of
groundwater by tetrachloroethylene (PCE) and trichloroethylene
(TCE) producing four identified groundwater contaminant plumes
(Northern, Southern, Central, and Western) within the City of Lodi. Efforts to remove PCE and related
contaminants from the Central Plume Source Area (CPSA), have been ongoing since 2003, utilizing both
soil vapor extraction (SVE) and groundwater extraction (GWE) systems. To date, the operation of the
current SVE/GWE systems has contributed to the removal of approximately 20,000 pounds of PCE
since operation began in 2011.
On May 18,2020, the Central Valley Regional Water Quality Control Board (CVRWQCB) approved the
City's recommended approach for decommissioning the CPSA remediation systems. Obtaining State
approval to decommission these systems with the CSPA is a substantial step forward in the City's overall
PCE/TCE cleanup program.
On July 15,2020, Council authorized Amendment No. 3 to the Professional Services Agreement with
Civil Hydro Tech, LLC for preparing plans and specifications and project management to carry out the
closure and decommissioning, in the amount of $157,500.
This project includes decommissioning the CPSA SVE and the GWE systems located near the alleyway
that lies between Pine Street and Oak Street, between Pleasant Avenue and Church Street, as shown on
Exhibit A. The work for this includes the following:
Decommissioning and removal of the CPSA remedial systems including all on-site granular
activated carbon vessels/tanks, concrete pad, above-ground piping and valves, and the treatment
system enclosure;
Removal of all underground piping associated with the CPSA remedial systems and the SVE and
groundwater extraction wells that lie within property boundaries;
Abandonment of the remedial piping within the City right of way;
Abandonment of nine pairs of shallow and deep SVE wells, three pairs of vapor monitoring wells,
and three groundwater extraction wells;
a Removal of allwell vaults;
APPROVED
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Approve Plans and Specifications and Authorize Advertisement for Bids for Central Plume PCE/TCE Groundwater and Soil Vapor Extraction System
Decommissioning and Removal
August 19,2020
Page 2
Excavation of the area near the intersection of alleyway and Pleasant Avenue, also shown on
Exhibit A;
Site restoration including street repair and other incidental and related work.
This system was always anticipated to be removed when the treatment was no longer effective. As a
requirement of the CVRWQCB, the City will need to provide notification and a fact sheet on PCE and
TCE to all property owners in the vicinity.
The specifìcations are on file in the Public Works Department. The planned bid opening date is
September 16,2020. The project estimate is $250,000.
Removal of this system will leave only two remaining City obligations in the Central Plume: 1) Operation
of the groundwater extraction system at the toe of the plume, near Clyde W. Needham Elementary
School, for an expected five to 10 year time frame, at an annual cost of approximately $150,000; and 2)
groundwater monitoring for an expected 2}-year time frame, at an annual cost of $75,000. The
PCE/TCE Fund is projected to have adequate funding to complete the remediation project.
FISCAL IMPACT:Closure of the SVE/GWE system will signifìcantly reduce annual operating
expenses; cost includes Granular Activated Carbon change-out. This work
does not impact the General Fund.
FUNDING AVAILABLE: Funding will be identified at project award
Charles E. Swimley, Jr
Public Works Director
Prepared by Andrew Richle, Utilities Superintendent
CES/AR/tc
Attachment
cc: Lyman Chang, Deputy Public Works Director
Gary Wiman, Project Manager
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EXHIBIT A
SVE AND GWE SYSTEM
DECOMISSIONING AND REMOVAL