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i <br /> 'ENGl� EERING <br /> 12793 PADDY CREEK LANE LODI, CA 95240 <br /> PH (209) 368-9381 FAX(209) 367-1163 <br /> July 31, 2002 <br /> Mr Michael Infurna <br /> San Joaquin County Public Health Services u <br /> Environmental Health Division AUG 13 2042 <br /> 304 E Weber Ave Third Floor <br /> Stockton, CA 95202 ENVIRORMENT HEALTH <br /> PERMIT/SERVICES <br /> Subject Connell Motor Truck Co - 2211 N Wilson Way Stockton CA 95205 <br /> Site Code 39-1304 Global ID T0607700812 <br /> RE Second Quarter 2002 Monitoring Well Sample Analysis Report <br /> • Dear Mr Infurna <br /> Please find below the Second Quarter 2002 Momtonng Well Sample Analysis Report of findings and <br /> recommendations for the above stated property <br /> i <br /> HISTORY OF UST REMOVAL,OVER EXCAVATION,AND PLUME DELINEATION <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 Asper the work plan for the removal,soil samples were extracted <br /> and analyzed for BTEX,TPHgas,TPHdiesel,and Oxygenates The analysis indicated the soil under and <br /> near the dispensers was contaminated with both gasoline and diesel The soil underneath and <br /> surrounding the three USTs was analyzed as non-detect for all compounds The tank excavation was <br /> 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 /> Vertical and Horizontal Delineation of Plume History <br /> Monitoring Wells MW#1, MW#2, and MW#3 were installed in September of 1999 to a depth of sixty <br /> I <br />