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Ms.Margaret Lagorio, SJCEHD October 21,2003 Joe's Truck Plaza Project No. 2033-15600-01 Work Plan for Additional Site Assessment Page 7 • Contract with a California-licensed well driller to install the proposed wells and drill the proposed exploratory soil borings. • Prepare a site-specific Health and Safety Plan. • Secure permits from SJCEHD to perform the drilling and well construction activities. • Mark the proposed well locations and notify Underground Service Alert at least 48 hours in advance of the scheduled field activities. • Secure a permit to discharge extracted water to the sanitary sewer during feasibility testing. • Secure a permit from the San Joaquin Valley Unified Air Pollution Control District to discharge treated soil vapor to the atmosphere during feasibility testing. • Secure building permits from the City of Lathrop for installation of the ozone generator and associated conveyance piping(as appropriate). Task 2: Soil Borings and Monitoring Well Installation Activities Drilling Activities Twenty-seven borings (MW-7 through MW-18 and IW-1 through IW-15) will be drilled to the base of the upper sandy zone (approximately 15 feet bgs). Twelve of these borings will be completed as shallow-screened monitoring wells, and fifteen will be completed as ozone sparge wells. Eight deeper soil borings (B-26 and DW-1 through DW-7) will be advanced to the base of the lower sandy zone (approximately 28 feet bgs). Borings DW-1 through DW-7 will be completed as deeper-screened monitoring wells. Boring B-26 will grouted to ground surface with neat cement after completion of drilling, unless evidence of impact is observed during drilling, and then it will also be competed as a deeper-screened monitoring well. Existing monitoring well MWO-1X will be drilled out, the boring backfilled to approximately 18 feet bgs, and then extraction well EX-1 will be installed in the upper portion of the boring. All borings will be advanced using a truck- mounted drilling rig equipped with 8-inch, 10-inch, or 15-inch diameter hollow-stem augers. The proposed locations of the exploratory soil boring, sparge wells, and monitoring wells are shown on Figure 2. 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. At a minimum, soil samples from each boring will be collected at 5-foot intervals during drilling using a California-type, split-spoon sampler, fitted with three pre-cleaned brass tubes. The sample tubes will be filled by drilling to the desired sampling depth, then driving the P:Uoe's Truck Plaza\Work Plans\Joes workplan 102103.doc