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-r <br /> TL 791-199-09 Page 2 <br /> f <br /> Drilling and Sampling: The soil borings will be drilled using <br /> a Central Mine Equipment Company, Model 75 (CME-75) truck-mounted <br /> drill rig equipped with 6-5/8-inch outside diameter (OD) , <br /> continuous-flight, hollow-stem augers . Soil samples will be <br /> obtained by driving a 2-inch OD and 1.5-inch inside diameter ( ID) <br /> by 1. 5-foot long split-barrel sampler, equipped with three 1 . 5-inch <br /> I diameter by 6-inch long brass sleeves, a minimum of 12 inches into <br /> the soil . The bottom sleeve of each sample will be retained for <br /> chemical analysis . The ends of the sleeve will be covered with <br /> Teflon® tape and sealed with plastic end caps. Each sample <br /> container will be labelled. Soil retained in the middle and the <br /> upper sleeves will be transferred into a plastic bag for field <br /> screening using a Photoionization Detector (PID) or a Drager tube. <br /> Upon completion of drilling operations, the soil borings will <br /> be backfilled from the bottom of the borehole to the surface with <br /> a sand-cement slurry. Soil cuttings generated by the drilling <br /> operations will be collected in 55-gallon drums and will remain on- <br /> site, pending the results of laboratory analysis. <br /> l Decontamination: Decontamination procedures will be <br /> implemented to reduce the potential for cross-contamination between <br /> samples . Before, during, and following drilling operations the <br /> augers and associated drilling equipment will be thoroughly cleaned <br /> using a high pressure hot water (steam) washer. The hot water <br /> washer has a pressure of approximately 1,200 pounds per square inch <br /> l (psi) and a water temperature of approximately 100 degrees <br /> Centigrade ( °C) . The sampler and brass sleeves will be steam <br /> cleaned or washed in a detergent solution, rinsed with clean tap <br /> l water, and air-dried prior to initial use and between each sampling <br /> 4 event. The augers will be steam cleaned prior to the drilling of <br /> 71 each boring. <br /> ' Wash water generated from the cleaning operations will be <br /> retained in a steel wash trough and transferred into 55-gallon <br /> steel drums . The drums will be sealed and temporarily stored on <br /> site at a location inaccessible to the public. Each drum will be <br /> labelled to identify its contents. The labelling information will <br /> include: generator's name and address, date(s) of accumulation, <br /> L source, company name, and job number. <br /> i <br /> a1.,77tea" .dx. <br /> Fresno Modesto Visalia Bakersfield <br />