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4 <br /> REPORT OF FINDINGS <br /> WALLACE • KUHL <br /> &ASSOCIATES INC. GRANITE CONSTRUCTION, FRENCH CAMP <br /> 10500 South Harlen Road <br /> French Camp, California <br /> WKA No. 2088.04 <br /> 4 December 2, 1993 <br /> INTRODUCTION <br /> In accordance with our workplan of July 26, 1993, we have completed the <br /> installation of three additional monitoring wells and the removal of diesel <br /> contaminated soil from around the former dispenser island at the Granite <br /> . Construction Company French Camp facility (PIates 1 and 2). The purpose of our <br /> r.. ' work was to further evaluate the extent of ground water contamination in the <br /> P .I vicinity of the five former underground storage tanks (USTs) and associated piping <br /> removed from the site on April 22, 1992. Additionally, we directed and <br /> documented the excavation of contaminated soil from around the former fuel <br /> dispenser island. <br /> SITE HISTORY <br /> ` q �-,V,i ; One waste oil, two diesel and two unleaded gasoline UST's were removed from the <br /> Fn„i(.k1n1 ,r,i 0-el'ult ng site on April 22, 1992. Analysis of samples obtained from beneath the waste oil <br /> `a UST revealed low concentrations of Total Petroleum Hydrocarbons (TPH) motor <br /> R"'.`”.I-Tjon 5`m—, oil beneath the southern end of the tank. Analysis of samples obtained beneath the <br /> diesel and unleaded gasoline UST's revealed TPH diesel concentrations up to 10 <br /> mg/kg and TPH gasoline concentrations ranging from 270 mg/kg to 5900 mg/kg. <br /> Analysis of samples obtained beneath the former UST product lines revealed no <br /> r <br /> detectable concentrations of TPH-motor oil or TPH-diesel. One sample obtained <br /> 'y 3.'50 IIIAk-trill Pig a from beneath the product lines revealed trace concentrations of TPH-gasoline. <br /> Sample P4, obtained from beneath the former dispenser island, revealed TPH- <br /> Y gasoline concentrations of 130 mg/kg and TPH-diesel concentrations of 15,000 <br /> mg/kg at a depth of six feet below site grade. <br /> '4ic i`-':414 <br />