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'FOOTHILL <br />`� ��err ENGINEERING <br /> r 71 .9 e) 1 79 PADDY CREEK LANE LCDI CA 95240 <br /> -' PF� F{� X209) 968-9981 FAX (209) 367-1163 <br /> May 9, 2000 <br /> Mr Michaellnfurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division P O Box 3881AA <br /> �L <br /> Stockton, CA 95201 <br /> Subject Connell Motor Truck Co - 2211 N Wilson Way Stockton CA 95205 <br /> Site Code 39-1304 <br /> RE Report on Phase 1 Work Plan for Vertical and Horizontal Delineation of Plume - Monitoring Well <br /> Sample Analysis - First Quarter 2000 <br /> Dear Mr Infurna <br /> Please find below the Groundwater Sample Report of findings and recommendations for the first quarter <br /> of 2000 for the above stated property <br /> GROUNDWATER SAMPLING REPORT - FIRST QUARTER 2000 <br /> HISTORY OF UST REMOVAL AND OVER-EXCAVATION <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 (see summary of results attached) The <br /> analysis indicated the soil under and near the dispensers was contaminated with both Gasoline and Diesel <br /> The soil underneath and surrounding the three USTs was analyzed as non-detect for all compounds The <br /> 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 /> WATER ANALYSIS OF SAMPLES FROM <br /> MONITORING WELLS <br /> Del-Tech Geotechnical Support Services extracted water samples from each monitoring well by standard <br /> 1 <br />