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FOOTHILL <br />ENGINEERING <br />' 12793 PADDY CREEK LANE LODI, CA 95240 <br />PH. (209) 368-9381 FAX (209) 367-1163 <br />November 14, 2002 <br />4 <br />21/ <br />gi41 21‘ <br />REuENED <br />NOV 2. 2 2002 <br />ENVIRON,Mr-:11 I <br />PERMIT/SERVa.:ES <br />Mr. Michael Infurna <br />San Joaquin County Public Health Services <br />Environmental Health Division <br />304 E. Weber Ave. Third Floor <br />Stockton, CA 95201 <br />Subject: Connell Motor Truck Co. - 2211 N. Wilson Way Stockton. CA 95205 <br />Site Code: 39-1304 Global ID T060770812 <br />RE: Phase 4 Work Plan for Vertical and Horizontal Delineation of Plume - Five CPT's and Two <br />Monitoring Wells <br />Dear Mr. Infurna: <br />Please find below the Work Plan for Five CPT's an two additional soil borings and three monitoring <br />wells as we verbally discussed on November 13, 2002. <br />HISTORY OF UST REMOVAL AND OVER EXCAVATION AND EXISTING GROUNDWATER <br />MONITORING <br />On June 11, 1998, the three USTs on this site were removed by Jim Thorpe Oil, Inc. of Lodi, California <br />under PHS/EHD permit and oversight. As per the work plan for the removal, soil samples were extracted <br />and analyzed for BTEX, TPHgas, TPHdiesel, and Oxygenates (see recap summary of results attached). <br />The analysis indicated the soil under and near the dispensers was contaminated with both Gasoline and <br />Diesel. The soil underneath and surrounding the three USTs was analyzed as non detect for all <br />compounds. The tank excavation was backfilled with onsite pea gravel. <br />Over excavation of the dispenser area was started and suspended on December 10, 1998 with less than <br />50% of the planned work completed. The excavated area was backfilled with pea-gravel and the <br />excavated soil was stockpiled on the site. Work was suspended due to the discovery of a large volume <br />of contaminated soil found below and adjacent to the pump islands. The test results from Sherwood Labs <br />indicated that the petroleum contamination was old and highly degraded. Due to the extent of the <br />petroleum contamination, the PHS-EHD ordered a delineation of the contaminating plume and a ground <br />water investigation. <br />To this date eleven soil bores with twelve monitoring wells have been installed. These wells have <br />partially defined the upper limits of the contamination in the areas of the fuel dispensing islands and the <br />surrounding area. The areas north, east, and south of the fuel islands have been defined. The area inside <br />the tire storage building has two shallow and two deep monitoring wells in single soil bores. The <br />1