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:. << _.~, • 4 1Lichard Fox Fox Engineering 1110 Oak Circle S. Broomfield CO 80020-1065 April 11, 1996 Mr. Allen C. Sorenson Division of Minerals and Geology Department of Natural Resources 1313 Sherman St., Room 215 Denver, CO 80203 Re: Water Spray Land Application Design, Gold Hill Mill File No. M-94-117 Dear Mr. Sorenson: Qt=f`1=1~/FD APR ~ z ~sss piviaion of Minorplo d (#Otlltlyy We have reviewed the water pumping system at the Gold Hill Mill and propose the following program to establish a land application of Hazel A water on the azea above the tailings pond. Water currently is pumped from the Hazel A and is pumped into two process water tanks at the west end of the mill building. When the tanks ere full, water overflows the tanks and is piped to the tailings pond by gravity flow through a 3-inch line. Water for mill makeup water is pumped from the two tanks (approximately 16,000 gallons each) to various mill circuits as fresh water makeup. We plan to replumb the water coming from the tanks after the process water pump so that the water will be pumped through a 2-inch line to three parallel distribution lines that will contain impulse type sprinklers with a throw radius of approximately 20 to 25 feet. The sprinklers will be placed every 40-feet along the three lines. The lines will be spaced approximately 30 feet apart. The head spacing will allow some overlapping coverage. Water flow will be from 60 to 75 gallons per minute. Estimated pumped flow from the Hazel A is 50 to 75 gallons per minute. Water from the tanks can also be discharged into the tailings pond through the main 2-inch lateral. The process tanks will be used as surge tanks to even flow to the land application and provide storage for Hazel A water when the ground is saturated. If the tanks aze full, water can still overflow to the tailings pond as it does now. If there is any other info[mation that you need, please call. Sincerely, ~~, Richard Fox