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amec <br />May 21, 2009 <br />Mr. Ron Roberts <br />CC&V Projects <br />Cripple Creek & Victor Gold Mining Company <br />P.O. Box 191 <br />Victor, CO 80860 <br />Re: Phase IV VLF Leak Detection Pipe Repair <br />Dear Ron: <br />AMEC Earth and Environmental (AMEC) has prepared this letter to certify that the Phase IV Leak <br />Detection Pipe was repaired in accordance with the design drawings and specifications. <br />During the installation of a new gas pipeline for CC&V, the Contractor excavated and damaged several <br />sections of the leak detection pipeline located outside the footprint of the Phase IV VLF. The leak <br />detection pipe exits the Phase IV VLF perpendicular to the access road along the west edge of the Phase <br />IV VLF then turns parallel with the road down to the Phase 4-C Monitoring Well. The damage to the pipe <br />occurred at several locations between where the gas pipe enters the access road and where the leak <br />detection pipe turns off into the VLF. The first damaged section occurred approximately 6 feet beyond <br />the transition from the 3-inch diameter perforated CPe pipe to the 3-inch diameter solid HDPE pipe. A <br />soil liner fill plug 1'xl'x1' in dimensions exists at this transition. The last damaged section occurred where <br />the gas pipeline entered within the footprint of the access road. <br />For the repair, a new section of 3-inch solid HDPE pipe was installed from where it transitions from the <br />CPe pipe to the last section of damaged pipe. A trench was excavated and the new pipe was placed in <br />the trench and then connected to the CPe pipe at the top and to the existing leak detection pipe at the <br />bottom using an electrofusion coupler from Central Plastics Company. The pipeline was buried with <br />bedding material (minus 2-inch material) to a thickness of 6-8 inches and the remaining trench was <br />backfilled with in-sins material excavated from the trench. The material was traffic compacted with a <br />Komatsu D38E straight track dozer and a John Deere rubber tired backhoe. <br />In addition, the soil liner fill plug was replaced around the transition zone using soil liner fill processed at <br />the South Cresson Clay Process stockpile. <br />An AMEC representative monitored pipe connections, bedding backfill and trench backf!II. The leak <br />detection pipe was installed in accordance with the design specifications and drawings. A photographic <br />summary of the installation activities is attached. <br />If you have any questions or comments, please contact me at (303) 433-0262. <br />Sincerely, <br />AMEC Earth & Environmental, Inc. <br />John F. Lupo, PhD., P.E. <br />Principal Engineer <br />MTH:jfl <br />cc: Anthony Martinez <br />„,_??Xaµ C; ?.G;rr?.?. F:r:v?nn-55-..r•r?t;a! !:mv. <br />.1.?-, :t..:.....:I:.WV ka:?k •u.V7ru,'}. ?`d:?i?i'?tt' :Y}y ?., <br />iE2 Ww?%l-"E?-c "'WT <br />SAPROJECTS\1125E CCV MAW - designUeak detection pipe repair letter 052009 mth.doc