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i Work Plan for Groundwater Extraction Well Installation March 15, 1993 Southland Site No. 20304, 455 Grant Line Road, Tracy, CA 2 TASK 2: SOIL BORINGS, SAMPLING AND ANALYSES, AND EXTRACTION WELL INSTALLATION Groundwater Technology will drill one soil boring using a truck-mounted drill rig equipped with 14- inch-diameter hollow-stem continuous flight augers. The soil boring will be drilled to approximately 30 feet below grade. To avoid introducing off-site or cross-contamination, the hollow-stem augers and drill pipe will be steam cleaned before drilling, and all sampling equipment will be properly cleaned. It is assumed that the drilling will be completed in one day. h Soil samples will be collected continuously during drilling to document lithology and to avoid breaching of the competent clay layer. Samples will be collected using an 18-inch California split- spoon sampler lined with 2-Inch-diameter by 6-inch-long brass sample tubes according to Groundwater Technology Standard Operating Procedures (SOP), copies of which are included in Attachment 2. Each soil sample will be screened for volatile organic compounds (VOCs) using a photo-ionization detector (PID). The soil samples will be described using the Unified Sol] Classification System by a Groundwater Technology field geologist, working under the supervision of a California Registered Geologist. Samples collected at 5400t intervals will be sealed with aluminum foil, capped with plastic caps, taped, labeled, and placed on dry Ice in an insulated container. The soil samples will be transported to a California-certified laboratory under chain-of-custody protocol. Soil generated through drilling will be placed on, and covered by, polyethylene plastic. After characterization, the soil will be transported to a licensed disposal facility by a licensed transportation company. The soil sample collected producing the highest response on the PID and the sample from the soil- water interface will be submitted for chemical analysis. Within 14 days of the collection, each sample will be analyzed by a California-certified laboratory for benzene, toluene, ethylbenzene, xylenes (BTEX), total petroleum hydrocarbons-as-gasoline (TPH-G) and total petroleum hydrocarbons-as-diesel fuel (TPH-D) by Environmental Protection Agency (EPA) Methods 5030/8020/8015. Groundwater Technology personnel will install a groundwater extraction well within the soil boring (Figure 1). The well will be constructed of 8-inch-diameter casing with flush threads and 0.020-inch- slot well screen. The well casing material has not yet been selected. The material will be selected based on general mineral analysis of groundwater, which occurred on March 11, 1993, during the quarterly groundwater sampling event. The well screen for the extraction well will be installed from 5 feet below grade to a total depth of 30 feet. A No. 3 Monterey sand filter will be placed around the well screen to a maximum height of 2 feet above the top of the screen. The well will be sealed to WP3767A1.5LL ti GROUNDWATER _ 'TECHNOLOGY,INC.