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'~ • iii iiiiiiiiiiiu iii <br /> 999 <br />_______ <br />.-_-_- <br />_ _ _ _~- <br />Envi <br />t <br />l <br />- ------ ronmen <br />a <br />December 6, 1995 <br />Anne Ihlenfeldt <br />Henderson Mine <br />P.O. Box 68 <br />Empire, Colorado 80438 <br />• <br />Titan Environmental Corpora[ia,s <br />7939 E. Arapahoe 12d., Suite 230 <br />Englewood, Colorido 80112 <br />Phone: (303) 850-y8524104-003 <br />Fax: (303)850-9910 <br />Transmittal <br />As-Built Drawings and Documentation <br />Henderson Mine Sedimentation Pond #1.2 <br />Dear Anne: <br />DEC 0 5 1995 <br />Division of Pmneraie a ~aovW~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 Sedimentation Pond #1.2. 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 />Description of Pond Construction <br />The Henderson Mine Sedimentation Pond #1.2 is a 26 acre-foot, sub-grade pe~nd that was <br />constructed using standazd construction methods with an excavator and haul trucks. Tht.pond is <br />lined with a 40-mil High Density Polyethylene (HDPE) liner which is anchored intondte pond <br />berms (see drawings). The inlet to the pond consists of a concrete flume structure witlt+two 16- <br />inch HDPE conveyance pipes which enter the pond. The pond outlet consists of arsi~ngJt?116-inch <br />HDPE conveyance pipe which terminates into a concrete outlet box. The atta~:(bsdltas-built <br />drawings provide details on the pond, inlet and outlet structures. <br />Pond excavation began on September 14, 1995 and was completed on October, I f., 1995. The <br />pond liner was installed between October 31, 1995 and November 25, 1995. Duringrthik period, <br />