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MR. PETER O'CONNDR June 10, 1986 Page 4 during a titre when water has pooled enough to substantiate a proper location. The location where buried culvert pipe will be used is 300 feet West of the •settling pond along the emergency spillway. The location has been identified on the Mine Surface and Hydrology Map. The pipe to be used is Galvanized rip- ple pipe, 24 inches in diameter and 30 feet long. The inlet and outlet points of the culvert pipe will be protected from erosion by lining them with country rock obtained from the construction of the diversion ditches. This rock is from the Menefee Formation and is typically flat with a thickness of 3 to 6 inches. The rock will be laid and fitted like tiles on both the inlet and outlet points. Thus, eliminating eroision from the flow of water. Accrmnilated silt removal will be field determined and performed prior to any noticable restriction of flow. BLUE FLAME COAL MINE is committed to monitoring water quality at the points located on the revised Surface and Hydrology Map (Map #1). One is located upstream from BLUE FLAME COAL MINE and downstream from KING COAL MINE. One is lo- cated downstream from BLUE FLAME COAL MINE. One is located immediately below the settling pond with the emergency spillway. (See Mine Surface and Hydrology Map). 3) With a proposed starting date of July 1, 1986, Water Quality monitoring will commence at the same time. Water quantity will be monitored and reported monthly and its quality will be reported quarterly. QUALITY JULY 5, 1986 OCTOBER 5, 1986 JAMIARY 5, 1987 APRIL 5, 1987 QUANTITY JULY 5, 1986 AUGUST 5, 1986 SEPTEMBER 5, 1_987 OCTOBER 5, 1987 ~)) BLUE FLAME COAL MINE anticipates a consumptive use of 20 gallons of water per day. If water that will be contained in the settling pond cannot be used, BLUE FLAME COAL MINE proposes to purchase a 500 gallon portable plastic water tank. It will be filled in the town of Durango at a public water terminal and transported to the mine for use. Q.S~ Enclosed please find amended page that corrects the typographical error made in regard to. the location of the mine before the potentiometric level. All references should be approximately 70 feet. ~(6~ The "Hydrology Map" referenced on Page 8 is synonymous with Map #1. It should read the "Mine Surface and Hydrology Map...". This sentence has been cor- rected. (7) The sediment removed from the settling pond will be stored immediately South and West of the settling pond as explained on the Surface and Hydrology Map. It is planned to use this sediment during the reclamation program. (See Mine Sur- face and Hydrology Map). (8) The country rock to be used in the diversion ditches will be obtained