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FOOTHILL <br /> ENGINEERING <br /> 12798 PADDY CREEK LANE LODI, CA 96240 <br /> PH. (209) 368-9381 FAX(209) 367-1163 <br /> Harlan Knoll July 22, 1998 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 388 ENVIRONMENTAL HEALTH DIVISION <br /> Stockton, CA 95201 304 E.Weber Ave.Third Floor <br /> P. Q. Box 388, Sto kton CA 95201-0388 <br /> Fax: 464-0138 Approved <br /> Denied <br /> Subject: Sun West Liquors, 2449 W. Kettleman Lane, Lodi, CA Conditions 1,0.p 1rh C6A•'S2 335 J <br /> Date by <br /> Dear Sir: <br /> The owners of Sun West Liquors have retained Foothill Engineering to develop and supervise a Work <br /> Plan to determine the extent of the gasoline contamination discovered during the removal of the UST <br /> and related piping on the site. The Underground Storage Tanks were removed by Jim Thorpe Oil <br /> on July 2, 1998, under the supervision of the PHS/EHD (see permits attached). <br /> Results of Tank Removal Soil Samples <br /> At the time of removal, seven tank excavation soil samples were extracted. These samples were <br /> analyzed by GeoAnalytical Laboratories, Inc. of Modesto, California. Each tank excavation sample <br /> was analyzed by EPA Method 8028, 7420, 5030/LUFT, and 8260 for gasoline. Two of the tank <br /> excavation samples were determined to be above the detection limit (see Summary of Analysis <br /> attached). Sample TK3S-14' was high in both BTEX and TPHg. <br /> Results of Dispenser Piping Soil Samples <br /> Seven soil samples were removed from under dispenser piping. Two of these soil samples indicated <br /> very low levels of BTEX. Three of these samples were above the detection level for MTBE. <br /> THE PROPOSED WORK PLAN <br /> Drilling and Sampling <br /> Foothill Engineering proposes to place and sample five pushbores as shown on the Site Plan attached. <br /> Each pushbore will terminate at an elevation five feet below the existing water table, unless <br /> terminated before that elevation by the mutual agreement of the PHS/EHD and the Engineer. <br /> Standard AX sample tubes will be used to contain the soil. Samples will be extracted starting at ten <br /> feet below the surface and continuing at four or five foot intervals depending on the type of <br /> equipment used. Water samples will be extracted by the grab sample method when water is <br /> encountered. Monitoring well installation is not planed under is Work Plan. <br /> Sample Analysis <br /> Samples will be transported under ice to an approved state certified laboratory for analysis. Samples <br /> will be analyzed by EPA methods 8020(BETX), and 5030/LUFT (TPH Gasoline). Samples selected <br /> by the PHS/EHD inspector on the site will be analyzed for oxygenates by EPA method 8260. Soil <br /> samples will not be analyzed for lead, as tank pull samples indicate that none of the contaminated <br /> areas contain lead above detectable levels. Water samples will be analyzed by the same methods as <br /> 1 <br />