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Workplan for Phase II Subsurface Investigation 3190 Auto Center Circle Stockton,California 95212 Partner Project Number 81147 March 10,2009 Page ( 2 Proposed Field Activities To address the recognized environmental condition identified by the Phase I,Partner will conduct a Phase 11 Subsurface Investigation. The scope of the investigation will include six soil borings(PES-131 through PES-B6). Utility Clearance Partner will notify Underground Services Alert North (USA) to clear public utility lines as required by law at least 48 hours prior to drilling activities. Health and Safety Plan Partner will review a site-specific Health and Safety Plan with all on-site personnel involved in the project prior to the commencement of drilling activities. Drilling Equipment Partner will subcontract with EnProb Environmental Probing (EnProb) (State of California C57 Water Well Drilling Contractor License Number 7770077)to provide and operate drilling equipment. Under the direction of Partner, Enprobe will advance borings PES-131 through PES-135 with a direct-push, truck- mounted Geoprobe drill rig and boring PES-135 will be advanced with a direct-push, limited-access Geoprobe drill rig. All drilling rods and/or sampling equipment will be decontaminated between samples and/or boreholes to prevent cross-contamination. Boring Locations Borings PES-B 1 and PES-132 will be advanced in the vicinity of the clarifier. Borings PES-133 and PES- B4 will be advanced in the automotive repair bays, at least one of which will be in the vicinity of the drain. Boring PES-135 will be advanced adjacent to the south of the property building in the vicinity of a potential subsurface vault and boring PES-136 will be advanced in the vicinity of the hazardous materials storage area. Please see Figure 3 for a map indicating proposed boring locations. Sampling Depths Borings PES-B1 through PES-136 will be advanced to a terminal depth of 15 feet below ground surface (bgs). Soil samples will be collected continuously from each boring until the terminal depth. A minimum of 24 soil samples will be prepared for laboratory analysis. Groundwater is not expected to be encountered during this investigation. Soil Sampling Methodology Soil samples will be collected using a 4-foot long by 2-inch diameter MacroCore sampler with a 4-foot long acetate liner, which will be advanced by the direct-push drill rig using 4-foot long (3-foot long for limited-access rig) by 1.5-inch diameter drill rods. The sampler will be driven into the subsurface to allow undisturbed soil to enter the open MacroCore barrel and retrieved in 4-foot intervals to recover the soil-filled liners.