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Trill be considered acceptable for backfill and stockpiled on-site <br /> for re-use. <br /> Soil generated by excavating potential sou7ce areas will he <br /> segregated. Discrete soi! samples will be col' lacteu for <br /> approximately every 25 cubic vara.s, and sets of tour discrete <br /> samples will be composited into, one at the laboratory no <br /> ct:aracterize every 100 cubic yards . Stockpiled soil slated for <br /> disposal (analytical results above TO ppm TPH-gas, 0 . 005 benzene) <br /> will be transported to Browning Ferris ' CX Mountain landfill <br /> facility. Clean import will be brought to the site for the purpose <br /> of backfilling excavations . <br /> Soil stockpile samples will be collected by removing the top F yc <br /> 12 inches o_F soil in each stockpi1 e , then pushing a sample tube <br /> into the soil until completely fuii . Samples will be sealed , <br /> labeled, recorded on a Chain-of-Custoly f= and tr_an:sported in a <br /> cooler with ice to the laboratory. <br /> 3 . 4 ite investigation fol jow ung qQy;nstallotion <br /> To supplement in--situ samples col '_ect&d during excavation and any <br /> overexcavation that may occur in spor locations, four soil borings <br /> and four monitoring welds will be installer{ed ( Figure 2 ) . The <br /> location of these borings/wells around the former tank pits and <br /> pump island areas are intended tc provide the necessary lataral <br /> delineation to formulate further corrective action, if necessary. <br /> Verri_.al definition data will be collected with t'ze borings. <br /> GCeclogic Meld interpr9tat ions along will: 1= i n i d screening wiil be <br /> used to determine adequate soil boring depth Lo ensure complete <br /> vertical definition of the extent of hydrocarbons in the soil - <br /> On-site and off-site utilities WA 1 be identified and cleared <br /> through Underground Service Alert (USA) and Chevron. Significant <br /> changes in boring/well locations will be cleared with San Joaquin <br /> County prior to drilling. health and Safety matters will be <br /> reviewed with the drilling contractor prior to the start of work. <br /> A trained geologist will observe the drilling and describe soil <br /> samples using a modified Unified Soil Classification System (ASTM <br /> 9-2488 ) , h1unsell Soil Color Charo and supplemented by s}- c-itic <br /> pertinent geologic and chemical obsrirvat:ions . ri detailed <br /> lithologic iog will be prepared for each boring/well by the <br /> geologist. <br /> 3 .4. 1 Sail Barings <br /> Conventional_ hollow stem auger methods will be used to drill the <br /> preposed borings. Eight to ten-inch outside diameter augers wiil <br /> be used. Augers will be sr.eam-cleared before use in each boring <br /> to prevent cross contamination . <br /> 3 <br />