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FOOTHILL <br /> ENGINEERING <br /> 55 12793 PADDY CREEK LANE LODI CA 95240 <br /> F'r PN (209) 368-9381 FAX (209) 367-1163 <br /> October 31, 2000 <br /> Mr Michael Inform <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 388 <br /> Stockton, CA 95201 <br /> Subject Connell Motor Truck Co - 2211 N Wilson Way Stockton CA 95205 <br /> Site Code 39-1304 <br /> RE 1 Report on Phase 1 Work Plan for Vertical and Horizontal Delineation of Plume <br /> 2 Installation of Eight Monitoring Wells Report <br /> 3 Third Quarter 2000 Monitoring Well Sample Analysis Report <br /> Dear Mr Infurna <br /> Please find below the Installation of Eight Monitoring Wells Report and the Third Quarter 2000 <br /> Monitoring Well Sample Analysis Report of findings and recommendations for the above stated property <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 surrounding <br /> the three USTs was analyzed as non-detect for all compounds The tank excavation was backfilled with <br /> 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 /> feet Soil samples from the soil bores were extracted at five foot intervals from a depth of ten feet to sixty <br /> feet(see site map for location attached) All three soil bores produced samples above detection levels for <br /> 1 <br />