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PHONE 285 2400 <br /> CABLE ADDRESS TIMOIL <br /> TACOMLA TE" JUN 0 2 1994 (FAX) 206 283 8036 <br /> PORTLAND <br /> STOCKTON T <br /> RENO 112 ] o ' 0 `� GG 6 <br /> RICHMOND 2 0 E T I M �'t�� <br /> LOS ANGELES 9 3 E NT <br /> s 4 !T <br /> 7PROD <br /> 5 2737 WEST COMMODORE WAY SEATTLE, WA 98199-1233 <br /> T <br /> S P 0 BOX 24447 SEATTLE,WA 98124-0447 <br /> Eq M <br /> June 1, 1994 <br /> Mr Michael Collins <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P 0 Box 2009 <br /> Stockton, California 95201 <br /> RE Problem Assessment Report <br /> Jackpot Food Mart, 1434 W Yosemite Ave Manteca, CA (Prop Number 04-167) <br /> Dear Mr Collins, <br /> Enclosed you will find a copy of Science and Engineering Analysis Corp 's <br /> (SEACOR) "Problem Assessment Report, Jackpot Food Mart, 1434 West Yosemite <br /> Avenue, Manteca, California" dated May 31, 1994, which summarizes site activities <br /> and contains analytical results Activities documented in this report were <br /> performed in response to the San Joaquin County Public Health Services Division <br /> of Environmental Health's (PHS/EHD) request dated June 24, 1993 <br /> For your convenience, a summary of site activities conducted from September 1991 <br /> through April 1994 is included as Attachment 1 <br /> Additional Site Investigation <br /> Based on data collected during a preliminary investigation (Canonie, April 1993) , <br /> additional site activities were conducted to further define the extent of <br /> hydrocarbon-impacted soils associated with the former tanks , and to determine if <br /> groundwater beneath the site had been impacted Prior to the implementation of <br /> field activities, SEACOR's workplan dated October 12, 1993 was submitted for your <br /> review Verbal authorization to proceed with the proposed work was received from <br /> the PHS/EHD on November 27, 1993 <br /> On December 2, 1993, a drill rig was utilized to advance 4 soil borings in the <br /> vicinity of the former tanks During field activities, soils were found to <br /> consist of fine to medium sands to a depth of approximately 15 feet This strata <br /> was underlain by clay Because the previous investigation indicated that the <br /> clay unit may be acting as an aquitard, all borings were discontinued at a depth <br /> of 16 5 feet below ground surface to prevent possible impacts to groundwater <br /> beneath the site Boring logs are included as Appendix B in the attached report, <br /> and boring locations are indicated on Figure 2 <br /> Soil samples collected from depths of 10 5 to 11 feet and 15 5 to 16 feet in each <br /> boring were submitted to an analytical laboratory and analyzed for gasoline and <br /> its constituents Analyses did not indicate hydrocarbons in any of the samples <br /> submitted for analysis Table 3 in SEACOR's report summarizes analytical results <br /> and Appendix D contains laboratory reports <br />