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contamination Soils were classified according to the Unified Soil Classification System • (USCS) Soil samples were collected at 5-foot intervals in each hollow-stem auger boring using a • California modified split-spoon sampler The sampler was driven 18 inches ahead of the drill bit using a 140-pound hammer with a 30-inch drop The split spoon sampler was fitted with three 6-inch long by 2 2-inch diameter brass liners Upon retrieval of the sampler • from the borehole, the soil was screened for organic vapor emissions using a MzcroTzp portable photoionization detector After vapor monitoring, the exposed ends of the sleeves were covered with Teflon sheeting, • fitted with plastic end caps, and labeled Sample labels included the following information boring number, location, depth, time, and collector's initials Soil samples were placed in a cooled ice chest and were delivered under Chain-of-Custody to American Environmental •i Laboratory Corporation, a State of California Certified Laboratory (State Certification No 1233) for analysis • Before beginning each borehole, the downhole equipment (auger sections) was steam cleaned to prevent cross-contamination from the previous borings Sampling equipment was cleaned between uses with a mixture of water and Liqui-Nox, rinsed in tap water, then deionized water Excess soil cuttings were placed in marked 55-gallon drums, sealed and • stored onsite Upon completion, five out of the six borings were backfilled with a cement grout containing 59o' bentonite • Soil Boring B-3 was backfilled with soil cuttings The auger bit broke off in the hole at 10 feet Numerous attempts to retrieve the bit were unsuccessful Mike Infurna from San Joaquin County gave permission to temporarily backfill soil boring B-3 with the drill • cuttings • rznkd-08(ml4) Page 7 AMERICAN