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fU� <br /> �'FOOTHILL <br /> __ -= ENGINEERING <br /> .) X12793 PADDY CREEK LANE LODI CA 95240 <br /> PH (209)-368-9361_FAX (209) 367-1163 <br /> 'JZ) <br /> January 24, 2041 <br /> Mr Michael Infurna <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 Fourth Quarter 2000 Monitoring Well Sample Analysis Report <br /> Dear Mr Infurna <br /> Please find below the Fourth Quarter 2000 Monitoring Well Sample Analysis Report of findings and <br /> 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,TPH gas,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 /> 401 feet(see site map for location attached) All three soil bores produced samples above detection levels for <br /> BETX and TPHg and TPHd (see Soil Sample Recap Attached) <br /> 1 <br />