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., <br /> I„ k09 KLEINFELDER <br /> r <br /> File No. 90163703 <br /> January 3, 2008 10 <br /> �• EPNIRuNM�I� `ri�c�TN <br /> Mr. Brian Hoffman PEPNiT/o-p,•f'�`� <br /> Granite Construction Company <br /> ` 10500 S. Harlan Road <br /> French Camp, CA 95231 <br /> ` Subject: Report <br /> Pre-Abandonment <br /> Underground Storage Tank Assessment <br /> 10500 South Harlan Road <br /> French Camp, California <br /> L, Dear Mr. Hoffman: <br /> This report presents analytical results for soil samples collected in the vicinity of a <br /> L asphalt oil underground storage tank (UST) cluster at the above-referenced site (see <br /> Plate 1). This report presents a summary of our field activities, observations, analytical <br /> results and conclusions. <br /> BACKGROUND <br /> The following information was supplied to Kleinfelder by Mr. Brian Hoffman of Granite <br /> Construction Company (Granite). Granite currently has five underground storage tanks <br /> %W (USTs) that contain/ed various mixtures of asphalt oil which includes the following <br /> designations: AR-4000, AR-8000, PG 64-10 and SC-800. These five tanks have been <br /> labeled No. 1 through No. 5 and according to Granite are located in a tank cluster in the <br /> east-central portion of the site located south of the "bag house" (see Plates 2 and 3). <br /> These tanks have a reported capacity of approximate 20,000 gallons and are located <br /> next to two formerly abandoned USTs labeled tanks No. 6 and No. 7. These five USTs <br /> have been used as secondary containment/overflow from two 30,000 gallon above <br /> ground tanks (ASTs). These two asphalt oil ASTs are located over UST Nos. 2 through <br /> ` No. 5. Each of the tanks is oriented in a north-south direction and have an approximate <br /> diameter of 10 '/2 feet with approximately 3 '/z feet of cover. Therefore, the total invert <br /> depth of the five USTs was estimated at 14 feet below ground surface (bgs). <br /> Granite has reported that UST No. 1 contains about 2,000 gallons of oil and water <br /> mixture and UST No. 2 contains about 5,000 gallons of oil and 10,000 gallons of water. <br /> ` UST No. 3 reportedly contains about 1,000 gallons of oil/sludge and the contents of <br /> 90163703/ST07R1061 January3, 2008 <br /> 02007 Kleinfelder Page 1 of <br /> t KLEINFELDER -8S EastMvrtle Street, Stockton, CA 95205-4794 12091948-7315 1'09`938-0621 fax <br />