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ARCHIVED REPORTS_XR0012343
EnvironmentalHealth
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3500 - Local Oversight Program
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PR0545517
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ARCHIVED REPORTS_XR0012343
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Last modified
3/11/2020 11:06:09 PM
Creation date
3/11/2020 11:18:04 AM
Metadata
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Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0012343
RECORD_ID
PR0545517
PE
3528
FACILITY_ID
FA0003798
FACILITY_NAME
MARCH LANE 76*
STREET_NUMBER
2701
Direction
W
STREET_NAME
MARCH
STREET_TYPE
LN
City
STOCKTON
Zip
95219
APN
11619007
CURRENT_STATUS
02
SITE_LOCATION
2701 W MARCH LN
P_LOCATION
01
P_DISTRICT
002
QC Status
Approved
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EHD - Public
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• <br /> ERI 205513 QS5 Tosco 76 Service Station 5886 Stockton, California July 30 1998 <br /> In April 1997, ERI performed an investigation to evaluate the source and extent of MTBE (ERT, June <br /> • 3, 1997) The investigation included hand-auguring three soil borings adjacent to select drains, <br /> drilling four soil borings and constructing dual completion groundwater monitoring wells (MW4S/D <br /> through MW7S/D) at discreet depths in the borings, associated well development and sampling, and <br /> analyses of soil and groundwater samples The data obtained during the investigation indicated the <br /> following <br /> 0 Residual hydrocarbons were not detected at or above the stated laboratory method detection <br /> limits in soil samples collected from adjacent to three on-site drains located near the pump <br /> islands (see Plate 2) except for maximum concentrations of 3 3 mg/Kg TPHg, 8 4 mg/Kg <br /> TEPHd, and 12 mg/Kg MTBE <br /> • 0 Residual hydrocarbons in soil appear to have been delineated beneath the site <br /> • Groundwater was encountered at approximately 9 to 14 feet bgs During May I997, static <br /> groundwater elevations ranged from approximately b to 9 5 feet bgs and the groundwater <br /> gradient was towards the southwest at a hydraulic gradient of 0 002 Groundwater elevations <br /> + were essentially the same in the shallow and deep wells, indicating hydraulic communication <br /> between the two depths <br /> • The lateral and vertical extent of TPHg and BTEX appear to have been delineated beneath <br /> the site Concentrations of MTBE were delineated in each direction except towards the south <br /> and southwest based on the initial sampling of wells MW4S/D through MW7S/D <br /> Based on the results of the investigation, ERI submitted a Work Plan which included 1) obtaining <br /> and reviewing available MTBE data from previous investigations, 2) performing two additional <br /> groundwater monitoring and sampling events and interpreting the data to further evaluate the extent of <br /> dissolved MTBE in groundwater and select additional well locations (if necessary), 3) drilling three <br /> soil borings adjacent to former drains, 4) obtaining appropriate permit(s) and access agreement(s), <br /> drilling off-site soil boring(s), collecting soil samples, constructing groundwater monitoring well(s), <br /> developing and purging the new well(s), collecting groundwater samples, analyzing selected soil and <br /> groundwater samples, and 5) preparing a report <br /> The SJCPHS/EHD response to the work plan requested Tosco complete the following 1) perform a <br /> • detailed site assessment to evaluate the lateral and vertical extent of MTBE in groundwater and <br /> whether these compounds have migrated off-site, and additionally analyze groundwater samples for <br /> the seven oxygenate compounds identified in the California Regional Water Quality Control Board <br /> Central Valley Region (CRWQCB) document dated July 18, 1997, 2) perform a conduit study and <br /> well survey to identify underground facilities that may provide potential preferential groundwater flow <br /> conduits, 3) characterize hydrogeology beneath and in the vicinity of the site, and 4) identify the <br /> source(s) of MTBE detected in groundwater beneath the site and the approximate time frame of <br /> MTBE/additives release and history <br /> At the request of Tosco, ERI submitted the addendum to our work plan (dated July 14, 1997) for the <br /> subject site by the requested date The addendum addressed the directive for a full dimensional <br /> • definition and investigation of soil and groundwater beneath and in the vicinity of the site and <br /> • <br /> 2 <br /> • <br />
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