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Additional 1,2-DCA Investigation al%wo-Jell Survey Table of Contents Former American Forest Products Facility 6/13/2005 URS Project No. 17322736 Page 4-1 4.0 DIRECT-PUSH WATER SAMPLING } During this investigation up to six water samples will be collected from the depth range of approximately 60 to 70 feet bgs. If possible, a target coarse-grained unit within that approximate interval will be targeted by completing one continuous core boring to a depth of 70 feet bgs. The borings will be advanced using a Power Probe Direct Push Drilling Rig operated by Woodward Drilling of Rio Vista. The water samples will be collected from the approximate locations shown on Figure 2. These locations have been selected to provide lateral coverage downgradient of the previously identified plume extent. All field procedures will be overseen by a geologist, under the direction of a California registered geologist. The on-site geologist will be present at all times during drilling in order to: • Direct and observe the drilling subcontractor; • Maintain a lithologic log of the borehole in accordance with the United Soil Classification System(USCS); • Screen drilling cuttings and atmospheric conditions within the work place with a PID; • Oversee the implementation of the Health and Safety Plan. 41 WELL INSTALLATION PERMIT AND UTILITY CLEARANCE Following the approval of this work plan, a San Joaquin County well installation permit will be obtained L for the proposed monitoring wells. Site access will be coordinated with the current site operator. The well locations will be marked and Underground Service Alert (USA) will be contacted to obtain clearance of underground utilities prior to the advancement of the borings. W 4.2 CONTINUOUS CORE A single borehole will be advanced at the location shown on Figure 2 to a depth of 70 feet bgs. The borehole will be advanced by direct push,and a continuous core will be collected using acetate liners.The samples will be screened with a PID and examined for lithologic identification. Laboratory analyses will not be performed. The lithologic analysis will be performed to extend knowledge of the shallow subsurface lithology to provide target depths for the water samples. 4.3 DIRECT-PUSH WATER SAMPLING AND ANALYSIS Groundwater samples will be conducted in general conformance with the American Society for Testing and Materials (ASTM) Standard D 6001 for direct-push water sampling. One groundwater sample per boring advancement will be collected between approximately 60 feet and 70 feet bgs. Depth-discrete samples will be collected by pushing hollow drive rods with a drive tip. A stainless steel filter screen is attached to the tip. At the targeted sampling depth, the rods will be retracted approximately 1.5 feet exposing the filter screen and allowing groundwater infiltration. After the body of the tool is pulled back and the groundwater flows into the sampler, a groundwater sample will be collected by lowering a stainless steel bailer through the drive tubing and into the body of the tool. The bailer will be retrieved to r 1� KAWprocess\22736\American Forest\Work Plan 20051Work Plan-2005_rev01_doe