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Geological TCCl4tcs/19c. Well Abandonment Report Page 4 Project No.750.2 January 12,2006 ,r horizontal lengths of 3-inch diameter PVC. These wells were abandoned using the following procedure: • The horizontal section of PVC pipe was exposed, by excavating a trench, as close to the sidewalk as possible using a backhoe. • The horizontal sections were cut as close as possible to the sidewalk. • Tremie pipe was run through the horizontal section of PVC to the 90° PVC elbow that linked horizontal and vertical casing. • Grout was pumped into each well casing through the 3/4 inch diameter tremie pipe and was allowed to freefall into the vertical section. This procedure was repeated until the entire length of casing was filled. • Grout was pumped into the "cut" horizontal PVC and allowed to mushroom over the PVC and fill the bottom 12 to 18 inches of the trench. • The excavated trench was backfilled to grade with clean overburden. Well: MW-3 This well was located in the narrow median along Escalon Avenue. These wells were abandoned using the following procedure: • The well box and associated concrete apron were removed by jackhammer, carefully avoiding damaging the median. • A vacuum truck and "wet" knife were used to excavate a hole to a depth of approximately 1 y� foot below grade. • Grout was pumped into the well casing using 3/4 inch diameter tremie pipe while displaced water was pumped into a DOT approved steel drum until disposal was arranged. It was noted that very little displaced water was present. • Pressure of approximately 35 psi was applied to the well casing for approximately 5 minutes. • The well casing was then cut off approximately 8-inches below grade. •� • Grout was pumped into the "cut" well casing and allowed to mushroom over the casing to approximately 4-inches below the bricks used to pave the median. • The grout was allowed to dry overnight and GTI mobilized to the site the following day and cemented in new pavers to match the brickwork used in the median. 3.0 SOIL DISPOSAL On January 12, 2006, Del-Tech Geotechnical Support Services transported 17,460 pounds of -• clean soil and concrete removed from the COE site during well abandonment activities. The soil and concrete were transported to Munn &Perkins Reclamation, 26292 East River Road, Escalon, CA 95320 to be recycled. The scale ticket is included as Appendix C.