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WZ1 INC <br /> The soils encountered in each well and the soil borings were logged in accordance with the <br /> Unified Soil Classification System (USCS) and inspected for indication of petroleum <br /> hydrocarbon contamination <br /> Undisturbed soil samples were collected at five-foot intervals and at the air/groundwater <br /> interface from each boring using a two-inch O D modified California split-spoon sampler <br /> lined with clean, brass sample sleeves The split-spoon sampler was driven ahead of the <br /> lead auger with a standard 140-pound drive hammer, free falling 30 inches Blow counts <br /> were taken for each six-inch driving interval <br /> The brass sample sleeves containing the soil samples were each fitted with aluminum foil <br /> end pieces and plastic end caps secured with tape All soil samples were immediately <br /> placed on ice in a thermally-insulated chest Selected soil samples were labeled and <br /> delivered under chain-of-custody documentation to Weston Analytical Laboratory of <br /> Stockton, California for TPH-G and aromatic volatile organics analyses using EPA Test <br /> Methods 8015 (modified) and 8020, respectively Portions of each sample were extruded <br /> into zip-lock plastic bags for field headspace measurement of volatile organic compounds <br /> with a photoionization detection meter <br /> 5.2 Monitoring Well Construction <br /> Monitoring well MW-1 was constructed through the 11-718-inch diameter hollow-stem <br /> augers using four-inch inside diameter (I D ), Schedule 40 PVC, 0 02-inch slotted well <br /> screen from 12 feet to 34 feet bgs and four-inch I D , Schedule 40 PVC well casing from 12 <br /> feet to approximately six inches bgs As previously mentioned, the bottom seven feet of the <br /> monitoring well MW-1 borehole was backfilled with bentonite pellets prior to well <br /> construction <br /> Monitoring wells MW-2 through -10 were constructed through the six and five-eighths-inch <br /> • hollow-stem augers using two-inch I D , Schedule 40, PVC, 0 02-inch slotted well screen <br /> and two-inch I D , Schedule 40, PVC well casing Monitoring wells MW-2 through -10 were <br /> 19150011 005 16 <br />