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• IIIIpIRlllllllul <br />Environmental <br />December 6, 1995 <br />Anne llllenfeldt <br />Henderson Mine <br />P.O. Box 68 <br />Empire, Colorado 80438 <br />• <br />Titan Environmental Corporaraale <br />7939 E. Arapahoe Rd., Suite 230 <br />Englewood, Colorado 80112 <br />Phone: (303) 850-5852 4104-003 <br />Fax: (303) 850-9910 <br />Transmittal <br />As-Built Drawings and Documentation <br />Henderson Mine Sedi6 nt~:atiA RM #11.2 <br />Dear Anne: <br />p r;:iver <br />DEC 0 5 1995 <br />DiHi5101I Of 1441neiais a V,*v"y <br />As requested, Titan Environmental Corporation (TEC) is sending to you three copies of the as- <br />built drawings and documentation for the Henderson Mine Rdi nentafibfi 41.2. The <br />attached documentation includes the following for your records: <br />• Pond liner acceptance letter; <br />• Liner QA/QC sheets; <br />• Pond berm soil compaction QA/QC sheets; <br />• Cushion sand specifications; <br />• Inlet flume specifications; <br />• Control gate specifications; <br />• Soil triaxial shear test results; <br />• Soil Proctor compaction test results; <br />• Soil sampling field sheets; and <br />• Design calculation briefs. <br />The following provides a description of the field conditions encountered during pond <br />construction based on TEC field records. <br />The Henderson Mine Sedimentation x #1.2 is a 26 acre-foot, sub-grade pond. that was <br />constructed using standard construction methods with an excavator and haul trucks. The-pond is <br />lined with a 40-mil High Density Polyethylene (HDPE) liner which is anchored intorde pond <br />berms (see drawings). The inlet to the frond consists of a concrete flume structure wi*two 16- <br />inch HDPE conveyance pipes which enter the pond. The pond outlet consists of als:kf* X116-inch <br />HDPE conveyance pipe which terminates into a concrete outlet box. The attmAedlias-built <br />drawings provide details on the pond, inlet and outlet structures. <br />N <br />l- <br />z <br />W <br />v <br />Q <br />Q <br />Pond excavation began on September 14, 1995 and was completed on October, 11!;, 1995. The <br />pond liner was installed between October 31, 1995 and November 25, 199.5. Duringl*thik period,