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PARADISOOONSTRUCTION Cly <br /> . � GENERAL & PETROLEUM CONTRACTORS VII <br /> LICENSE NO. 259820 <br /> �M"Ir P.O. BOX 6397 <br /> ® ® 9220 "G" STREET OAKLAND, CA 94603 <br /> (415) 562.5511 <br /> SOIL AND GROUNDWATER SAMPLING PROCEDURE <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 from a diesel tank pit are analyzed for TPH as <br /> diesel and BTX 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 />