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i ~ y~ III I IIIIIIIIIIII III pros Yempe Volley Coal Corporation ,~Y~ 28667 Routt County Road #27 y~ ~s ~ ~ Oak Creek, Goloredo 80467 ~i Yampa Vallsy 303-879.3800 October 26, 1992 Kent Gorham Reclamation Specialist Mined Land Reclamation Division 1313 Sherman Street, Room 215 Denver, CO 80203 Dear Mr. Gorham; Rat site i TCC is requesting the above-referenced revision to allow the long- term diversion of Site 109 to Site 114. This diversion will allow TCC to begin recycling water used in its operation, and will help to alleviate the potential for water shortages which might otherwise impact productivity. The enclosed Map 24 (Surface Facilities) shows the proposed location of the buried diversion line and protective steel sleeves, The diversion will consist of a 6 inch PVC PIP irrigation pipe attached to the existing 109 riser. This line will be buried and will. cross the existing berm immediately to the north of the 109 riser. From that point, the line will parallel the berm, crossing the roadway near the operations center at a depth oP approximately 3 Peet. Should ground conditions warrant it, an 8 inch diameter steel pipe will be installed to act as a protective sleeve for the PIP pipe where it crosses the road. The line will then run along the berm until reaching the east end of the heavy-equipment pad, where the line will make a 45' turn to the north and pass under the PM Bay access road. Again, a protective steel pipe sleeve may be installed should conditions warrant it. From the PM Bay Road down to the existing Site 114 vertical culvert the line will be buried to a depth of 6-8 feet. At Site 114, the existing culvert which has been backfilled with washed rock will be utilized as an infiltration point, with the line entering the culvert at a depth of not less than 6 Peet. Water will then infiltrate into the spoils and replenish the aquifer prior to being pumped from Site 114 to the million gallon tank and thence underground. Please note that the bonding calculation assume removal of 10& oP the line, and that the line removal cost is less than or equal to the cost of that for 4 inch welded steel. Total bond for this project is soma $775, which leaves TCC a current bond excess of $63,821.