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Ci Mr. Jeff Deathridge Colorado Division of Water Resources 9 December 2000 LETTER SENT VIA FAX Re: Additional Information on the Camilletti Milner Pit # 2 Gravel Pit -Well Permit. Dear Mr. Deathridge: The purpose of this letter is to supply the additional information we talked about in a telephone discussion this past week regarding our previously submitted Gravel Pit -Well Permit for the above-mentioned project. During that discussion, you requested that we supply additional information regazding the following items; dewatering amounts, consumptive use for dust control, batch plant consumption along with the amount which will be diverted and the number of acres of land which will be irrigated. In order to ensure that each of these items is adequately addressed, we will identify each topic and then give our response. Dewatering. Operations at the adjacent Connell Resources Thompson Pit, located approximately three miles upstream of this site result in a dewatering rate of 750,000 gallons or 2.30 acre feet per day or approximately 521 gallons per minute. Based upon extensive exploration logs of our specific site, our hydrologist estimates that we will have similar dewatering amounts generated by this operation. His analysis of the physical properties of the overburden and gravel deposits found on our site indicate that these specific types of materials will yield transmissiviry values of between ] 0 and 2,000 gallons per minute, but the value given above is the estimated average. Using this value, this operation will generate as a result of dewatering operations approximately 839.50 acre feet of water per yeaz. Dust Control. Under a worst case scenario, it is estimated that approximately 50,000 gallons or 0.15 34 acre feet of water will be used for dust control per day of operation. This equates to a consumptive use amount of approximately 11,000,000 gallons or 33.76 acre feet of water being used for dust control each year. Batch Plant Consumption. Although not a part of the initial operation, in future years this gravel pit will probably have both an asphalt and cement batch plants associated with this operation. Based upon the consumptive water use of these facilities, it can be calculated under a worst case scenario, that approximately 705,000 gallons or 2.16 acre feet of water will be used per yeaz in the asphalt batch plant and approximately 2,200,000 gallons or 6.75 acre feet of water will be used per yeaz for the operation of the concrete batch plant. Irrigation Use. It can be calculated that approximately 150 acres of land will potentially be irrigated as a result of this operation. The amount of water which will be potentially diverted onto these areas, will be approximately 796.83 acre feet of water per yeaz. Based upon discussion with the Steamboat Springs office of the Natural Resource Conservation Service, wherein they estimate that only approximately 30 percent of these flood irrigation waters will be consumptively used, it can be estimated that only approximately 239.05 acre feet of water will be consumed as a result of irrigation use.