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ATTACHMENT C FIELD AND LABORATORY PROCEDURES Exploratory Drilling and Soil Sampling The soil borings were drilled using 8-inch hollow-stem auger drilling equipment Borings were logged by a SECOR International Incorporated scientist using the Unified Soil Classification System and standard geologic techniques under the direction of a California registered geologist Soil samples for logging were collected at 5-foot depth intervals using a California-modified split-spoon sampler Additionally, continuous samples for logging were collected from 5 feet bgs to 64 feet bgs in SB-1 The sampler was driven a maximum of 18 inches using a 140-pound hammer with a 30-inch drop Soil samples were collected by advancing 2-inch-diameter brass sample liners into undisturbed soil, reached through the center of the drill auger All soil samples for chenucal analysis were retained in the brass liners, labeled, and capped with Teflon sheets and plastic end caps The samples were then sealed in clean zip-lock bags, placed on ice, and transported to the laboratory accompanied by the appropriate chain-of-custody documentation Down-hole sampling equipment was washed in a tri-sodium phosphate or alconox solution between samples All down-hole drilling and sampling equipment was steam-cleaned prior to and following the completion of each soil boring Groundwater Monitoring Well Installation Each of the groundwater monitoring and soil vapor extraction wells were constructed of 2- inch-diameter schedule 40 PVC blank casing and 0 020-inch-slot well screen with flush threads A #3-sand filter pack was installed in the annulus from the bottom of each borehole to approximately 2 feet above the top of the well screen, followed by a well seal consisting of a 2-foot-thick hydrated bentonite layer overlain by grout to ground surface Each well was secured by a locking expandable well cap and fitted with a traffic-rated well box set in concrete 077 42064 222/well install doe February 19,2002