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Report Remedial Investigation and Well Installation Report Date October 6,2004 ATTACHMENT D FIELD AND LABORATORY PROCEDURES Exploratory Drilling and Soil Sampling The soil borings were drilled using 8 25 and 10 25-inch hollow-stem auger drilling equipment Borings were logged by a URS geologist using the Unified Soil Classification System Soil samples were collected from the borings at 5- foot intervals and/or continuously using a California modified split-spoon sampler The sampler was driven a maximum of 18 inches using a 140-pound hammer with a 30-inch drop Soil samples for chemical analysis were retained in brass liners, capped with Teflon® squares and plastic end caps, and sealed in clean zip-lock bags The samples were then placed on ice for transport to the laboratory accompanied by chain-of-custody documentation Down-hole drilling equipment was steam-cleaned following the completion of each soil boring Down-hole sampling equipment was washed in a non-phosphate soap and deionized water solution between samples Groundwater Monitoring Well Installation The groundwater monitoring was constructed of 2-inch inside diameter, schedule 40 PVC, blank casing and 0 020- inch machine-slotted well screen with flush threads A#3 silica sand filter pack was installed in the annulus from the bottom of the borehole to approximately 2 feet above the top of the well screen, followed by a transition seat consisting of a 6-foot-thick hydrated bentonite plug, which in turn was overlain by neat cement grout to ground surface The well was secured with a locking expandable well cap and fitted with a traffic-rated well box set in concrete The groundwater remediation wells were constructed of 2 and 4-inch inside diameter, schedule 40 PVC, blank casing and 0 020-inch machine-slotted well screen with flush threads A #3 silica sand filter pack was installed in the annulus from the bottom of the borehole to 3 feet above the top of the well screen, followed by a transition seal consisting of an approximately 3-foot-thick hydrated bentonite plug, which in turn was overlain by neat cement grout to near ground surface The remediation wells will be plumbed to the proposed site remediation system and fitted with traffic-rated vault boxes set in concrete Soil Sampling from Drummed Soil Soil samples were collected by advancing 2-inch-diameter brass sample liners into the soil drum after removing approximately 6 inches to I foot of surface material in the sample location One composite soil sample was collected Soil samples for chemical analysts were retained in the brass liners, labeled, and capped with Teflon® sheets and plastic end caps The samples were then sealed in zip-lock bags, placed on ice, and transported to the laboratory accompanied by the appropriate chain-of-custody documentation Laboratory Analysis of Soil Samples Soil samples were analyzed for GRO, BTEX, fuel oxygenates, and lead scavengers by U S EPA Method 8260B Drummed soil samples were analyzed for GRO and BTEX by U S EPA Methods 8015/8021, lead content was analyzed by U S EPA 6000/7000 Series Methods K 1Wprocess\J5 BP ARCM218612004 Assess menAReport 04 doc Page D-1