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<br />__- <br />TUTTLE APPLEGATE, INC. <br />Consultants for Land and Resource Development <br />Dr. Jeris A. Danielson <br />State Engineer <br />July 16, 1990 <br />Page 3 <br />2. OPERATIONAL LOSSES <br />Operational consumptive use includes the water removed from the <br />pits that are contained in the materials being mined. It was <br />estimated that 4% of the gross weight of the products removed is <br />water as suggested by the State Engineer's Office (See Table No. <br />2). Approximately 12,000 tons of material are removed from the <br />pit each year. <br />Dust control is being handled by applications of water and <br />calcium chloride. Water used for dust control was based on 21 <br />days of application and two tank loads per day. One tank holds <br />approximately 5,000 gallons. The corresponding monthly and <br />annual amounts of water used are found on Table No. 2. <br />No wash waters are used in the crushing and screening process <br />used by Weld County. <br />3. CREDIT FOR HISTORIC CONSUMPTIVE USE <br />No historic consumptive use credit was taken for the Koenig Pit <br />in this report. <br />C. REPLACEMENT <br />1. METHOD OF REPLACEMENT <br />The approach used in this study to replace stream depletions was <br />to use an existing pond as a recharge well. Equivalent pumping <br />rates were computed for lake losses and operational losses and <br />were totaled together with recharge pumping rates in order to <br />find the net effect on the stream system (See Table No. 3). <br />Summer irrigation water was used for recharging the aquifer and <br />thus eliminates the need for wintertime storage. <br />2. TIRING OF THE REPLACEMENTS <br />The calculation of the timing of the replacements was found by <br />using the computer model, 'Analytical Stream Depletion Model', by <br />Dewayne R. Schroder from the State Engineer's Office. <br />