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Y R <br /> A .. <br /> CKWILL <br /> FIV'JiRt�I�WIN]A',- +'`il1.1 H <br /> Engineers PERMT;SERVICi:S <br /> Planners <br /> Economists <br /> � Scientists <br /> July 10, 1991 <br /> SFO31605.PM <br /> 'r <br /> San Joaquin County Public Health Services <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Attention: Mr. Steven Schneider, RENS <br /> Subject: Del Monte - 2716 East Miner tank investigation z <br /> Dear Steve: <br /> CH2M HILL performed a subsurface soil investigation between June 4 and .Tune <br /> + 13 at the Del Monte property located at 2716 East Miner Avenue, Stockton, <br /> California. The soil investigation occurred in the vicinity of a former buried 500- <br /> gallon gasoline tank and a suspected 500-gallon diesel fuel tank. <br /> 1 <br /> Seven soil borings were 'sampled as described in the Workplan. The soil from the <br /> borings consisted of predominantly silts and silty sands. Soil samples collected <br /> from the borings were analyzed for BTEX, TPH-Gas or TPH-Diesel, and lead. <br /> The analytical results for BTEX, TPH-Gas, and TPH-Diesel are shown on the <br /> attached tables. All lead results were within background soil levels, typically less <br /> than 10 mg/kg. <br /> The results of the soil analyses were evaluated using the Leaking Underground <br /> Fuel Tank (LUFC) Field Manual, and the Tri-Regional Board Staff Recommen- <br /> dations for Preliminary Evaluation and Investigation of Underground Tank Sites. <br /> Based on this evaluation, a groundwater monitoring well does not appear to be <br /> required. <br /> Using the LUFT Manual Leaching Potential Analysis for Gasoline and Diesel <br /> 1 of the LUFF Manual), a worksheet score of 39 points was obtained for <br /> _. <br /> 10 <br /> the East Miner Tank Site. This score in icdtes that aTPH-Gas 1Cvel of up to <br /> mg/kg"can be left in place without threatening ground water". The highest TPH- <br /> Gas concentration found during the soil investigation was 3.6 mg/kg. <br /> CN_%1 Hi1C San Frcrnci5co Otfice 6425 Chnsfie Avenue.Suite 5)9 -715,652.242'6 <br /> Emery 5•iNe.CA 94008 rok 475, 2 0482 <br />