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April 7, 1992 �--M <br /> ARCO Service Station No 760, Lodi, California <br /> Removal of Underground Tanks <br /> On June 18, 1991, a geologist from RESNA observed the removal of two single-walled, <br /> 8,000-gallon gasoline-storage tanks and one 6,000-gallon gasoline-storage tank. Our <br /> geologist noted there were no signs of leaks, pitting, or holes in the tanks Mr Enc Trevena <br /> of the San Joaquin County Public Health Services, Environmental Health Division <br />' (SJCPHS-EHD), and Mr. Dave Carroll of ARCO observed the tank removal The tanks <br /> were removed by ARCO's subcontractor Golden West of Brentwood, California The tanks <br /> were transported by H and H Shipping Services of San Francisco, California, to their facility <br /> During excavation and tank removal, our geologist used a PID to evaluate the soil for the <br /> presence of hydrocarbon vapors Two vertical trenches were excavated to 13 feet below <br /> grade (within 2 feet of the former tank bottoms) under each former tank on June 18, 1991, <br /> and soil samples were collected Sample locations are shown on the Generalized Site Plan <br /> dated June 1991 (Plate 3) Soil samples S-13-T1N, S-13-T2N, and S-13-T3N were collected <br /> under the northern end of each tank, and samples S-13-TIS, S-13-T2S, and S-13-T3S were <br /> collected under the southern end of each tank In addition, soil sample S-10-1S was <br /> collected from the sidewall south of former tank T3 at 10 feet below grade Soil samples <br /> S-6-1N and S-10-2N were collected from the north sidewall because discolored soil was <br /> noted by the geologist Soil removed was stockpiled north of the dispenser islands At <br /> ARCO's request, the tank cavity was not overexcavated. <br /> After forwarding results of the above soil samples, we requested authorization from the <br /> SJCPHS-EHD for the contractor to place a geofabnc on the bottom and sidewalls of the <br /> 1 former tank cavity and backfill the former tank cavity with soil excavated from the new tank <br /> cavity At the request of the SJCPHS-EHD, we forwarded a product information for <br /> geotextile fabric on July 17, 1991 With verbal authorization from the SJCPHS-EHD on <br /> July 17, 1991, we observed the contractor place the geofabnc in the former tank cavity <br /> 1 <br /> 38048-5 7 <br /> i <br />