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i Geological Technics Inc. f Well Abandonment Report Page 4 Project No.750.2 January 12,2006 .s .4 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. j • The horizontal sections were cut as close as possible to the sidewalk. r • 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 '/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 ahlowed to mushroom over the PVC and fill the bottom 12 to 18 inches of the trench. k • The excavated trench was backfilled to grade with clean overburden. , I Well: MW-3 This well was located in the narrow median along Es6lon Avenue. These wells were l abandoned using the following procedure: !� i • The well box and associated concrete apron were removed by jackhammer, carefully avoiding damaging the median. I • A vacuum truck and "wet" knife were used to excavate a hole to a depth of approximately I foot below grade. i • 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. t 3.0 SOIL DISPOSAL l d I ' I 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 I 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. ;i 4yF { :I I, �I 3 1 T � I 'I 4 it ,L I� I F