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Page 2 <br /> Soil Sampling <br /> Verification soil samples were collected from the excavation <br /> bottom and sidewalls at various depths below grade to <br /> evaluate the remediation effectiveness . Soil samples were <br /> collected from the excavator bucket by removing the top few <br /> inches of soil and pushing a clean, six-inch-long (two <br /> inches in diameter) brass sample tube into the soil until <br /> completely full . The ends of the tubes were covered with <br /> teflon tape and/or aluminum foil and sealed with plastic end <br /> caps . The samples were then labeled, placed in a cooler with <br /> ice, entered on a Chain-of-Custody form and given to an on- <br /> site mobile laboratory or transported either to GTEL <br /> Environmental Laboratory located in Concord, California or <br /> Superior Precision Analytical, located in Martinez, <br /> California. All laboratories used are State-certified. <br /> Stockpile samples were collected by removing the top 16 to <br /> 18 inches of soil, then pushing a clean sample tube into the <br /> soil until completely full . The samples were then sealed, <br /> labeled and handled as described above . <br /> Excavated soils suspected to be hydrocarbon impacted were <br /> segregated and sampled seperately. Excavated soils suspected <br /> to not be hydrocarbon impacted were discretely sampled <br /> approximately every 20 cubic yards for confirmation analysis <br /> before reusing as backfill material . Soils suspected to be <br /> impacted were sampled for disposal as required by Forward <br /> Landfill . For these purposes, one soil stockpile sample was <br /> collected for approximately every 25 cubic yards . Four <br /> samples were then composited into one at the laboratory for <br /> a representative analysis of approximately every 100 cubic <br /> yards . Thirty six samples designated with an SP pre-fix <br /> represent soil samples collected from the stockpiled <br /> materials ( SP-6 through SP-38a-d) . SP-6 through SP-11 and <br /> SP-14 through SP-26 were discrete samples representing soils <br /> segregated for on-site reuse as backfill . SP-12a-d, SP13a-d <br /> and SP-27a-d through SP-38a-d represent soils characterized <br /> for off--site disposal . Note that sample SP-27a-d was to be <br /> composited by the laboratory, but by mistake was run as four <br /> discrete samples designated as SP--27a, SP-27b, SP-27c and <br /> SP-27d. <br /> Soil samples collected from the former fuel (UST) complex <br /> excavation and associated stockpiles were analyzed for Total <br /> Petroleum Hydrocarbons calculated as Gasoline (TPH-Gasoline) <br /> according to EPA Method 8015 (Modified) and Benzene, <br /> Toluene, Ethylbenzene, and Xylenes (BTEX) according to EPA <br /> Method 8020 . Soil samples collected from the former product <br /> piping and pump island areas were also analyzed for TPH-gas <br /> and BTEX constituents . Verification samples collected from <br />