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EUBLIC � <br /> HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> _ 1 <br /> JOGI KHANNA M.D.,M.P.H. ` <br /> a: < <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) •Stockton, • �' <br /> CallrOtnla 95201 <br /> (209) 4683400 <br /> BRAD KINCAID FRAHM <br /> P O BOX 30577 \ U <br /> STOCKTON CA 95213 U SCP g n 199i <br /> RE: Siebold Corporation <br /> 820 South American SITE CODE: 1010 <br /> Stockton CA <br /> APN 147292-11 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has evaluated documents pertaining to the above mentioned site. PHS/EHD has the <br /> following comments for your consideration and action. <br /> PHS/EHD requested, in correspondence dated January 23, 1992, that a Preliminary <br /> Investigation and Evaluation Report be submitted within 14 days. The response <br /> PHS/EHD received on February 3, 1992 was a letter summarizing events. The status of <br /> the site has not changed. A summary report is still required. <br /> The August 7, 1990 soil sample results evidenced 330 ppb toluene and 210 ppb <br /> ethylbenzene under the dispenser used for the former 8000 gallon gasoline tank. In <br /> addition detection limits used for the analysis of soil samples below the former 8000 <br /> gallon gasoline and 1000 gallon diesel tanks were too high. <br /> On May 24, 1991 a re-excavation of contaminated soils occurred in the area of the 2000 <br /> gallon gasoline tank. The soil samples collected at the time of the re-excavation were <br /> noted to be either moist or wet. Seasonal high depth to groundwater for this site was <br /> reported in 1986 to be 30 feet below ground surface (bgs). The samples were taken at <br /> approximately 15 feet bgs which would have been 15 feet above seasonal high depth to <br /> groundwater. Thus, there was no apparent reason for soil to be moist or wet. While the <br /> results did not indicate detectable contamination, PHS/EHD does not accept these <br /> results, since the samples do not appear to be representative of normal site conditions. <br /> Additional investigation of the extent of contamination in the above discussed areas is <br /> warranted. In future sampling, use the detection limits listed in Table 3-5 in the LUFT <br /> Manual. <br /> A Division of San Joaquin County Hnith Cate Sevmcm <br />