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INTERNATIONAL <br /> TECHNOLOGY <br /> CORPORATION <br /> February 15, 1991 <br /> Ms. Eleanor Ratliffe <br /> Public Health Services <br /> San Joaquin County <br /> 445 N. San Joaquin Avenue <br /> Stockton, CA 95201 <br /> Dear Eleanor: <br /> Attached are all results of in-situ (ie., pit) samples from the two former UST <br /> pits at BP Oil Station 11192, located at 1403 country Club Drive in Stockton, <br /> California. <br /> Samples from the old fuel UST pit (tanks 1,2,3) exhibit gasoline. A plan for <br /> characterization and interim remedial steps to deal with this excavation is <br /> presently being prepared. <br /> Samples from the waste/motor of 1 UST it tanksyrsf � ti <br /> ti hydrocarbons, excepting sample SST-6-E (east entl�tarke6e13 footcbeiow <br /> ground surface). This sample had no BTEX detections, but had 29 mg/kg �f an <br /> Unknown hydrocarbon measured as but not identical to diesel (TPH). Based on <br /> these results, IT suggests limited further excava-ion and confirmatory <br /> sampling of the area of the waste/motor oil UST pit around sample SST-6-E. <br /> IT recommends excavating an area 9 feet by 9 feet an additional depth of 5 <br /> feet (to 18 feet total depth) and taking four confirmatory samples. This <br /> excavation would center over the area from which sample SST-6-E was removed. <br /> These samples would be analysed for TPH-d and BTEX. Should these samples be <br /> non-detect for these analyses, IT recommends that the waste motor oil <br /> excavation be environmentally closed; and that approval. be given to place the <br /> new waste oil UST in this pit and begin backfill operations. <br /> Your prompt attention is requested. <br /> Sincerely, <br /> Dan Wynne <br /> Project Manager <br /> DW:mr <br /> MA:LTR:9556 <br /> Attachments <br /> Regional oince <br /> 4585 Pacheco Boulevard.maainez.Camomia 94553.415.372-9190 <br /> .- !T corporal-on rs a wholly owned svhsfdfory of International Torhnolo - <br /> gycorporalron - <br />