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a- aZf <br /> PUBLi�HEALTH SEIGICES .�o <br /> SAL'JOA UIN COUNTY 2' <br /> JOGI KHANNA\f.D...NIT.H <br /> Health Officer ' <br /> P• <br /> ..CqC/F , <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) 0 Stockton, California 95201 <br /> 6.0 <br /> (209) 468-3400 ' <br /> CHUCK CARMEL <br /> ARCO PRODUCTS COMPANY n � <br /> P O BOX 5811 CCJ-j <br /> SAN MATEO CA 94402 �� JAN 0 9 1992 <br /> RE: Village ARCO #2133 IN REPLY REFER TO SITE CODE: 1021 <br /> 2908 West Benjamin Holt Drive <br /> Stockton CA 95207 <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) has completed <br /> review of the 1991 Third Quarterly Report dated November 18, 1991 prepared by Brown and Caldwell <br /> and the ARCO letter dated December 2, 1991. PHS/EHD comments follow. <br /> 1. The PHS/EHD letter dated June 17, 1991 requested fecal coliform testing of all monitoring <br /> wells within 50 feet of sanitary sewer lines. To date, this testing has not been initiated. Sample <br /> all monitoring wells for the presence of fecal coliform contamination. Please be advised that <br /> PHS/EHD inspections are an important aspect of local regulatory oversight. Thank you for <br /> providing notice prior to site activities and please continue to do so. <br /> 2. The PHS/EHD letter dated October 17, 1991 requested information and documentation for the <br /> disposal of stockpiled soil associated with the September 23, 1991, holding tank removal and <br /> waste oil tank installation. Please submit this information to both PHS/EHD and the Central <br /> Valley Regional Water Quality Control Board (CVRWQCB) by January 15, 1992. <br /> 3. Thank you for including the Armour Petroleum receipt dated July 16, 1991, for the disposal of <br /> groundwater purged in July. Please submit documentation and/or summary of past purged <br /> groundwater disposal with the next quarterly report. <br /> 4. Figure 2, the "Constituent Concentration Map", included in the 1991 Second Quarterly Report <br /> incorrectly represented the contamination associated with monitoring well E-10. According to <br /> the NET laboratory report and Table 3, Analytical Results, also included in the report, the correct <br /> contamination of E-10 is 9400 ppb TPH-gas, 850 ppb benzene, 210 ppb ethylbenzene, 230 ppb <br /> toluene, and 1100 ppb xylene. <br /> 5. Please include total depth of monitoring wells in Water Level Elevation Tables to expedite <br /> evaluation of the amount of water in the monitoring wells. <br /> 6. The July 1991 sampling results indicated that monitoring wells had either become more <br /> contaminated: E-2, E-10, E-11, E-12, and BHD-1; gone dry: E-3, E-4, E-5, E-6, E-7, and <br /> E-9; or remained non detectable: PR-1, PR-2, and BHD-2. Monitoring wells that became <br /> increasingly contaminated did so despite the operation of the groundwater extraction system. In <br /> all future quarterly monitoring reports, please include the amount of groundwater which was <br /> extracted and discharged to the City of Stockton sanitary sewer. <br /> A Division of San Joaquin County Health Care Services <br />