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Mr.Nuel Henderson, SJCEHD October 17,2005 Site Investigation Work Plan Former Quick-n-Save Market&Gas, Stockton,California Page 3 UST complex and in relatively close proximity to boring B-1, where petroleum hydrocarbon impacted groundwater was previously identified. The proposed scope of work has been subdivided into tasks 1 through 4. Details are provided for the activities associated with each task. All work will be conducted under the direct supervision of a State of California Professional Geologist or Engineer, and will be conducted in accordance with standards established by the Tri-Regional Board Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites (April 2004), and SJCEHD guidelines. A California-licensed C-57 drilling contractor will perform all drilling and well construction activities. Stratus' Field Practices and Procedures are included in Appendix A. Task 1: Pre-Feld Activities Following approval of this Work Plan, the following activities will be completed: • Retain and schedule a licensed C-57 drilling contactor, • Obtain drilling permits from SJCEHD, • Prepare a health and safety plan for the site, • Mark boring locations and contact Underground Service Alert to locate underground utilities in the vicinity of the work site, and • Notify SJCEHD and the property owner of the scheduled field activities. Task 2: Field Activities Task 2A: Soil Borings A licensed well driller will advance the soil borings using a truck-mounted drill rig equipped with 8-inch diameter hollow stem augers. Each soil boring will be converted to a groundwater monitoring well, as described below. The locations of each proposed well are shown on Figure 3. The initial 5 feet of each boring will be advanced with a hand auger and/or posthole digger to reduce the possibility of damaging underground utilities. Soil samples will be collected at 5-foot intervals using a California-type, split-spoon sampler equipped with three pre- cleaned brass tubes. The ends of the bottom-most, intact tube from each sample interval will be lined with TeflonTm sheets, capped, and sealed. Each sample will then be labeled, placed in a resealable plastic bag, and stored in an ice-chilled cooler. Strict chain-of- custody procedures will be followed from the time the samples are collected until the time the samples are relinquished to the laboratory. Soil contained in the remaining brass tubes UQuick-n-Save\Work P1ans\quicknsave-wp-101705.doc 5TRATU5