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u r.e Extraction Well Installation Report June 7, 1993 . Southland Site No. 20304, 455 Grant Line Road, Tracy, CA 2 geologist notified the SJCPHS/EHD Inspector, Ms. Mary Meays. Ms. Meays was present during a portion of the drilling operation. The boring log is presented in Attachment 3. The laboratory data sheets are presented In Attachment 4. The extraction well was installed on May 11, 1993. Using a 15-inch-diameter hollow-stem auger, truck-mounted drilling rig, the grouted boring was over-{frilled to a depth of 30 feet. The extraction well is constructed of 8-inch-diameter Schedule 40 polyvinyl chloride (PVC) casing, with 25 feet of 8-inch-diameter stainless steel, slotted screen (0.020-inch slot width) at the base. Well construction details are presented in Attachment 3. The SJCPHS/EHD inspector, Ms. Mary Meays was present during a portion of the installation operation. On May 14, 1993, the well was developed using a combination of surging and pumping to remove fine-grain sediments from the well and filter pack. Before well development, the water table was monitored to measure static levels and thickness of separate-phase product. The water-table level was measured using an ORS Environmental Equipment INTERFACE PROBE m Well Monitoring System, which consists of a dual optical sensor and electrical conductivity probe, that distinguishes between water and petroleum products. The water table was encountered at approximately 6 feet below grade. Approximately 0.10 inch of separate-phase hydrocarbons was measured at the water • table. The top-of-casing elevation of the extraction well Is planned to be surveyed by a California licensed land surveyor scheduled for the end of May. The extraction well will be sampled during the quarterly groundwater monitoring and sampling event scheduled for June 11, 1993. Approximately 3 cubic yards of soil cuttings were generated during drilling and stockpiled onsite. One composite soil sample was collected and analyzed for TPH-G, BTEX, and toxicity characteristic leachate procedure (TCI P) lead. Analytical results for the composite soil sample reported concentrations acceptable for Class III landfill disposal. Laboratory data are presented in Attachment 4. Approximately 700 gallons of purged groundwater were generated during drilling and well development. A waste profile for groundwater generated by purging and development activities has been obtained for the site. Both soil and purged groundwater are scheduled to be removed from the site and disposed of in early June. • 3767R023.020 i i C GROUNDWATER � ,��tECHNOIAGY, INC.