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S E C 0 R Circle K Store 08671 August 31, 2005 Page 3 site Well installations were performed on April 25, 2005 by a C-57 licensed drilling subcontractor Site Health and Safety Plan As required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910 120), and by the California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), SECOR updated the current site-specific Health and Safety Plan (HASP) prior to the commencement of fieldwork The HASP was reviewed by field staff and contractors before beginning field operations, and was in the possession of SECOR personnel while conducting work activities at the site Permitting Prior to installing the soil vapor extraction wells, SECOR obtained a well permit from the San Joaquin County Environmental Health Department The permit was approved on April 19, 2005 A copy of the well permit is included as Attachment 2 Subsurface Utility Clearance Prior to initiating field activities, SECOR marked the boring locations, contacted Underground Service Alert (USA) 48 hours prior to the initiation of field work, and contracted a private utility locator to determine whether the proposed boring locations were clear of potential subsurface obstructions In addition, the borings were hand dug to 5 feet bgs before machine drilling began SVE Well Installation 1 s The soil borings were drilled using 8-inch hollow stem auger drilling equipment to a depth of approximately 30 feet below ground surface (bgs) After the boreholes were advanced to the desired depth the soil vapor extraction wells (SVE-1 and SVE-2) were completed by installing a 2-inch diameter, Schedule 40 polyvinyl chloride (PVC) casing with 25 feet of 0 020-inch factory slotted screen A sand pack was placed in the annular space across the entire screen interval, extending 2 feet above the top of the screen A 2-foot bentonite transition seal was placed atop the sand pack to dust below ground surface The wellheads were completed at the ground surface with lockable compression-type well caps and flush- mounted, traffic-rated 8-inch well vaults with bolt down lids Vapor extraction well SVE-1 was placed near monitoring well MW-1(S) and SVE-2 was placed adjacent to MW-4(S) (Figure 1) Well construction details are presented in Table 1 The boreholes were logged by a SECOR geologist under the direction of a registered geologist, using the Unified Soil Classification System and standard geologic techniques and were recorded onto boring logs (Attachment 3) Soil samples were collected at minimum five-foot intervals 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 3 J 3 1