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~ III IIIIIIIIIIIII III ~ :~ Ft~C~IV~I~ MINE DEVELOPMENT INC. + 1288 CR 205 Durango, Colorado MAR 1 Z 1982 CCMINED LAND RECLAMATION March 12, 15~1~' Dept. of Natiral Resource Mr. Mark Loye Reclamation Specialist Mine Land Reclamation Board 423 Centennial Building 1313 Sherman St.., Denver, CO Re: Mine Development Inc. Neglected Mine File #51-165 Dear Mr. Loyee This letter is in reply to your letter of Dec. 24, 1981 to Mr. Gilbert F. Rindahl. I have used the same method of response as you have, relative to our answers for the stip- ulations. 1. In order to contain any leakage that could possibly occur from our vat system, the concrete pad under the tanks will be enclosed by a 16" high cement block berm tied to the base pad with reinforcing steel bars placed in the concrete. The berm and pad are coated with water and acid proof asphalt emulsion, there-by forming a per- fect seal for all joints. In the lowest corner of the pad is a drainage valve where any solutions will collect and may be pumped back into the system or neutralized and disposed of through the normal proceedures. The containment area should hold in excess of 5000 gallons, there-by containing all of the liquid from our largest tank. A schematic draw- ing is enclosed which graphically describes the pad and berm construction. 2. As soon as we have any material to submit to you for analysis, this will be done. 3. The tailings pond was excavated out of a red shale member of the Cutler formation and provides an excel- lent base rind walls for the pond. This material is very impervious and holds water very well. In addi- tion, a litter of Griffolyn type #BS has been placed in the pond to insure that no seepage will be allowed to reach ttte sub surface. Beneath the' Griffolyn #85 liner we have placed a leak detection pipe. This pipe is 1" polyethelene tubing which is plugged on the end and has perforations in