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PUBLIC H?ALTH SERVI( iS <br /> SAN JOAQUIN COUNTY = Z <br /> Q: <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> PORN <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 FILE COPY <br /> KAREN PETRYNA <br /> C/O EQUIVA LLC MAY 2 61999 <br /> PO BOX 6249 <br /> CARSON CA 90749-6249 <br /> RE: TEXACO STATION SITE CODE: 1055 <br /> 440 W CHARTER WAY <br /> STOCKTON CA <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) and the <br /> Underground Storage Tank Cleanup Fund (USTCF) have recently reviewed the files associated with the <br /> site referenced above. Although groundwater monitoring is continuing, the plume is undefined. Data from <br /> monitor well installations at this facility fail to characterize the vertical component since soil samples <br /> below the groundwater interface were not commonly provided at fuel leak sites in the early 1990's. <br /> However, field-screening notes during the installation of most boreholes (see MW-1 through MW-16 <br /> borehole logs) clearly document the existence of contaminants at depths greater than 50 feet below grade <br /> surface (bgs). The responsible parties at this site have failed to appropriately define (laterally and <br /> vertically) the soil and groundwater plume and are currently out of compliance with corrective action <br /> regulations. <br /> The responsible party is now directed to submit a workplan to PHS/EHD considering the following <br /> comments. The workplan must be approved and implemented within 90 calendar days from the date <br /> of this letter. <br /> Data from cumulative tables indicate that ground water in many monitor wells exceed the screened <br /> intervals. In 12 of 30 cases the responsible parry has failed to sample MW-16 (since 1991). In 15 of 22 <br /> cases the responsible party has failed to sample MW-8,during the November 9, 1998 sampling event(last <br /> report to PHS/EHD) the technician reported the well as dry. Both MW-8 and MW-16 are directly <br /> downgradient from the site. Please resolve these issues for the next monitoring event, if the wells are no <br /> longer useable,a permit to repair,or destroy and replace the wells will be required. <br /> A first quarter 1999 report has not been received by PHS/EHD. The monitoring wells at this Underground <br /> Fuel Tank (UST) leak site are inadequate and insufficient to properly locate and define the extent of <br /> contaminant distribution in the saturated zone as evidenced by the vertical and horizontal variations of <br /> contamination observed at this site. Historic depth to water in this area has been documented by the San <br /> Joaquin County Flood Control Department in excess of 80' bgs during the operational period for this <br /> facility. Please be aware that fuel hydrocarbon contamination has been documented in soil and <br /> groundwater at depths in excess of 100'below grade surface at sites in this area. Commingled contaminant <br /> plumes are also suspected in this area. <br /> Boreholes shall be completed as monitoring wells with appropriate screen intervals to locate and <br /> effectively define the plume (soil and groundwater).At least two boreholes should be continuously cored. <br /> 1 <br /> A Division of San Joaquin Count)' Health Care Services <br />