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J Revised Work Scope 2303 West Lane, Stockton,California The work scope for the soil and groundwater investigation proposed for the former R&L Diesel site, located at 2303 West Lane, in Stockton, California(`Site")has been revised. The revised work scope includes a total of six borings, the locations of which are shown on the attached figure. Five of the boring will be advanced for the purpose of collection of soil samples, and one boring will be advanced to collect a reconnaissance groundwater sample from the uppermost water bearing interval beneath the Site. Scope of Work Shallow soil samples will be collected from the following locations: • Beneath the dynamometer • Beneath the north edge of the maintenance shop floor slab (where hazardous material has historically been stored) • Adjacent to the septic tank/drain field behind the south west corner of the maintenance shop • Near the northwest corner of the Site,where treated railroad ties had been stored • Near the northwest corner of the Site,where an above ground storage tank("AST") historically was located. The reconnaissance groundwater sample will be collected from the parking area north (assumed downgradient)of the site maintenance shop. A sample of groundwater from the upper most saturated zone will be collected from this location. The exploratory borings for reconnaissance soil sampling will be advanced using either a hand- held auger or a direct push drill rig. To minimize damage to the existing facility structures, angle holes using the direct push drill rig will be advanced beneath the dynamometer and the building floor slab. Soil samples will be collected beneath the bottom of the dynamometer sump, and beneath the shop floor slab and subgrade. Near the former AST location and the area used for storage of railroad ties, shallow borings will be advanced through the asphalt and subgrade. A sample of soil immediately beneath the subgrade will be collected at each location, using the direct push drill rig. A shallow boring will be advanced using a hand-held auger near septic tank, where the drain field line exits the tank, at an estimated depth of 2-3 feet below grade. The boring for the reconnaissance groundwater sample will be advanced using a direct push drill rig. The borehole will be advanced to shallow groundwater. At this depth,the drill rod will be retracted to expose a temporary well point,and groundwater will be allowed to enter the well