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• :NGINEEQS' III III III IIIIIII III <br />Y <br />~.9 <br />CASTLE CONCRETE COMPANY <br />Application No. 77-210 <br />(Snyder Qyarry) <br />Information Furnished Per Staff Questions (Letter of July 10, 1~~79): <br />A. MINING PLAN <br />uestion #1: What drainage control measures, surface and/or subsurface, <br />are p anne to ensure that the water in the retention area will not rise <br />to the 7025 foot elevation causing the berm to act as a dam, <br />Comment: The Water Storage Facility is one of three possible ultimate <br />uses for this site. If this use is selected, it will require an <br />agreement with whomever has the water rights on either or both of the <br />subject creeks. Assuming satisfactory long term arrangements together <br />with a need for a storage facility of this type, a water conveyance <br />system from each creek to the storage reservoir would need to be <br />constructed. This system would be either in the form of a conduit or an <br />open channel with a suitable diversion structure at the headgate of each <br />system. This water conveyance system would be automatically and manually <br />~ controlled to maintain a desired pool elevation (designated at 7000 on <br />' Attachment #2). This elevation is 25 feet below the bottom of berm <br />elevation. An outlet system would be required to release stored water <br />as the demand dictates. This system would provide a second m=_ans of <br />controlling the permanent pool elevation, the principal contr•~1 being the <br />intake systems from each creek. <br />Runoff entering this retention pond that is uncontrollable is from an <br />approximate 27 acre area surrounding and immediately adjacent to the <br />retention pond. It is estimated that annually this would contribute 40 <br />inches to the elevation of the water surface. As a matter of comparison, <br />the average annual evaporation from the surface of the pond would be <br />60 inches. <br />In summary, the intake facilities from both creeks would control the flow <br />into the retention pond, thus the pool elevation. The maximun elevation <br />would be 7000 or 25 feet below the bottom of the berm. Unconi.rolled storm <br />runoff would be offset by the evaporation on an annual basis. The effect <br />of a single storm would be negligible. <br />