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Chevron/South E1 .Dorado 8 <br /> September 1990 <br /> Soil. Borings. The soil borings will be drilled to a depth <br /> of approximately 60-feet using a Failing F-10 drill rig using <br /> 8 . 25-inch, outside diameter (O.D. ) , hollow--stem flight augers. <br /> The drilling will be supervised by an on-site geologist who will <br /> choose the sampling intervals and maintain °a log of the <br /> lithologic variations as- they are encountered. <br /> Soil samples will be.'taken at approximately 5-foot intervals <br /> during drilling. Samples will .be obtained by driving a split- <br /> spoon sampler, lined with three, 2-inch-diameter -by 6--inch long <br /> brass tubes into the undisturbed soil at the bottom of the <br /> borehole. One tube from each 18-inch sampling drive will be <br /> sealed with aluminum foil, capped, taped, labeled, and placed on <br /> ice in an. insulated cooler for transport to GTEL Environmental <br /> Laboratories, Inc. (GTEL) in Concord, California. The samples <br /> will be accompanied by Chevron Chain-of-Custody Documentation. A <br /> second sample from each interval will be field-screened for <br /> volatile !,hydrocarbon vapors using a Thermo Environmental Model <br /> 580A organic vapor meter (OVM) . Based on the field observations <br /> .t <br /> and OVM readings, at least one sample from each borehole will be <br /> selected 1,foranalyses for the presence of benzene, toluene, <br /> ethylbeniene and xylenes (BTEX) , and for TPH-as-gasoline using <br /> modified U. S. Environmental Protection Agency (EPA) Methods <br /> 5030/8020%8015. <br /> Monitoring.Well Construction. Monitoring wells will be <br /> installed:' in all four borings immediately after drilling. The <br /> wells will be constructed. using 2-inch-diameter, Schedule 40, <br /> 0. 020-inch machine-slotted polyvinylchloride (PVC) well screen <br /> and blank casing (Figure 3) . <br /> r <br /> _- — =GROUNDWATER .. <br /> TECHNOLOGY, INC. <br />