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`/'' <br /> k" KLE1 N FELDER <br /> May 15, 1991 <br /> File: 24-214400-B00 <br /> Ms. Mary Maeys <br /> San Joaquin County Public Health Services <br /> Environmental Health Division MAY 2 9 1991 <br /> P.O. Box 2008 ENVIRONMENTAL HEALTH <br /> Stockton, CA 95201 PERM IT/SEP,V;C s <br /> RE: Soil Assessment Reports <br /> San Joaquin County Motor Pool <br /> Dear Ms. Maeys: <br /> Please find enclosed, the requested information for the final closure of the underground <br /> storage tank (UST) #5 located at the San Joaquin County Motor Pool facility at 444 South <br /> Wilson Way in Stockton, California. The requested information for the adjacent tank site <br /> (tank #3) is also included. <br /> As we have discussed, Kleinfelder has conducted two phases of soil assessment <br /> investigations of the San Joaquin County Motor Pool at 444 South Wilson Way in Stockton, <br /> California. The results of these investigations are presented in Kleinfelder's reports dated <br /> December 22, 1989 and October 9, 1990. The scope of work for both assessments was <br /> requested and approved by the San Joaquin County Public Health Services, Environmental <br /> Health Division SJCEHD) before the work was initiated. <br /> The items you requested in our February 27, 1991 telephone conversation are briefly <br /> discussed below. Item 2 pertains to the soil assessment of USTs #3 and #5. The <br /> remaining items pertain only to the UST#5 soil assessment. <br /> 1. The boring log for B-8 (October 1990) has been revised to show the correct sample <br /> number (#64692) at 11.5 feet. The corrected boring log is attached. <br /> 2. During the December 1989 investigation, samples analyzed by EPA Method 8020 <br /> had detection limits of 50, 50, 50 and 100 ug/kg for the compounds benzene, <br /> toluene, ethylbenzene and xylenes (BTEX), respectively. In addition to this <br /> analytical method, the soil samples were also analyzed for BTEX compounds using <br /> EPA Method 8240, which had lower detection limits. BTEX compounds were not <br /> detected at 5.0 ug/kg in the EPA Method 8240 analysis. <br /> 3. During the October 1990 investigation, samples analyzed by EPA Method 8020 had <br /> detection limits of 50, 50, 50 and 100 ug/kg for the respective BTEX compounds. <br /> The laboratory indicated that these were the reporting limits capable with their <br /> equipment at the time. Based on SJCEHD's need for lower reporting limits, the <br /> laboratory has reassessed the chromatograms and has re-issued the results with <br /> reporting limits lowered by a half. Please note that the BTEX compounds were not <br /> detected at these new reporting limits for the samples analyzed. The new laboratory <br /> results summarized on Table 2 and a copy of the new laboratory data sheets dated <br /> March 22, 1991 are attached. <br /> Copyright 1991 Kleinfelder, Inc. <br /> KLEINFELDER 9795 Business Park Drive, Sacramento, CA 95827 (916) 366-1701 <br />