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�f Report: Remedial investigation and Well Installation Report Date: October 6, 2004 Rf 1 ATTACHMENT D FIELD AND LABORATORY PROCEDURES F Exploratory Drilling and Soil Sampling The soil borings were drilled using 8.25 and 10.25-inch hollow-stem auger drilling equipment. Borings F 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 1 oil samples collected for chemical analysis were retained in brass liners, capped Waste disposal s Y ' F drop. p p with Teflon® squares and plastic end caps, and sealed in clean zip-lock bags. Soil samples collected from soil borings were field preserved using laboratory prepared EPA Method 5030 sample kits. Soil is collected from the split-spoon sampler using the syringe supplied in the kit (approximately 5 grams of soil) and placed in to the vial to be filled. This is repeated for each of the four vials supplied. Open the tube of methanol and pour into the high-level amber vial supplied. Tightly cap all the vials and complete Fthe collection information on the label provided. 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 ` F in a non-phosphate soap and dcionized water solution between samples. Groundwater Monitoring Well Installation The groundwater monitoring wells were 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 T 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 seal 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 1 and 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 F 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 Fin turn was overlain by neat cement grout to near ground surface. The remediation wells were plumbed to the proposed site remediation system and fitted with traffic-rated vault boxes set in concrete. Soil Sampling from Drummed Soil F. Soil samples were collected by advancing 2-inch-diameter brass sample liners into the soil drum or soil bin after removing approximately 6 inches to 1 foot of surface material in the sample location. Three composite soil samples were collected. Soil samples for chemical analysis 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. 1 . K:1Wpr0cessV5 SP ARCO%02168\2006 System install ation\Report.doc Page D-1