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a `p TC4)NSTRUCITION <br />CA <br />GENERAL & PETROLEUM CONTRACTORS <br />LICENSE NO. 259820 <br />P.O. BOX 6397 <br />9220 "G" STREET OAKLAND, CA 94603 <br />(415) 562-5511 <br />SOIL AND GROUNDWATER SAMPLING PROCLIDURE <br />Gasoline, Diesel and Waste Oil Tank Removal <br />Underground storage tanks require two soil samples per tank of 1000 <br />gallon capacity or greater. Tanks of a smaller capacity require one <br />sample per tank unless otherwise required by local agencies. Samples <br />are collected at a depth of two feet below the tank backfill. <br />Soil samples from beneath gasoline storage tanks are analyzed for Total <br />Petroleum Hydrocarbons (TPH) as gasoline (low to medium boiling <br />fraction) using EPA method 8020. Samples from beneath diesel fuel <br />storage tanks are analyzed for TPH as diesel (high boiling fraction) <br />using EPA methods 3550 and 8015. <br />If groundwater is encountered in a fuel tank pit, water sample is <br />collected. The sample is collected in a glass VOA (Volatile Organic <br />Analysis) vial, insuring that no head space remains in the vial. The <br />vial is sealed with a Teflon—lined screw cap. Water from a gasoline <br />tank pit is analyzed for TPH as gasoline and BTX using EPA methods 602 <br />and 5030. Water samples froma diesel tank pit are analyzed for TPH as <br />diesel and BTR using EPA methods 3510 and 8020. <br />Soil samples collected from beneath waste oil tanks are analyzed for TPH <br />high boiling'fraction, using EPA method 3550 and 8015; total oil and <br />grease (TOG) using EPA extraction method 3550 and gravimetric <br />determination method 8010 and 8020 or EPA method 8240. Groundwater <br />samples collected are collected as described above and are analyzed for <br />TPH, high boiling fraction using EPA methods 3510 and 8020, and volatile <br />organic compounds using EPA method 6240. <br />The analysis for all soil and water samples are done by a state <br />certified lab. <br />