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�FO0THILL <br /> 7 <br /> (. �ENGI�EERING <br /> 2793 PADflY CREEK LANE LC<DI CA 95240 <br /> ^ r I`� } PH (2C79?)3��r 938 7 FAX (209) 367-1163 <br /> Mr Michael Infurna January 25, 2000 <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 Report on Phase 1 Work Plan for Vertical and Horizontal Delineation of Plume - Monitoring Well <br /> Sample Analysis - Four Quarter 1999 <br /> Dear Mr Infurna, <br /> Please find below the Groundwater Sample Report of findings and recommendations for the fourth <br /> quarter of 1999 for the above stated property <br /> GROUNDWATER SAMPLE REPORT - FOURTH QUARTER 1999 <br /> HISTORY OF UST REMOVAL AND OVER-EXCAVATION <br /> On June 11, 1998,the three UST's 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 nearthe dispensers was contaminated with both Gasoline and Diesel <br /> The soil underneath and surrounding the three UST's 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 MONITORING WELLS <br /> Del-Tech Geotechnical Support Services extracted water samples from each monitoring well by standard <br /> 1 <br />