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<br />Nr. Hal Simpson <br />State Engineer's Office <br />October 14, 1993 <br />Page 5 <br />3. Timing of Replacement <br />The site is approximately 4000 feet from the Arkansas River. Consequently, <br />the time lag of the depletions to the river was not assumed to be <br />instantaneous. Timing of the depletions was found by using the computer <br />model, Analytical Stream Depletion Model, by Dewayne R. Schroder from the <br />State Engineer's Office. <br />Values for the input parameters and results of the computer model are <br />attached with this letter. The well location was assumed to be at the center <br />of the proposed lakes. The impermeable boundary was located on a USGS <br />topographic map. <br />The USGS publication, Pumping Tests in Colorado - Colorado Ground Water <br />~.rcular Nom. 11, was used to estimate the value of transmissivity. Data was <br />evaluated from this publication and a transmissivity of 200,000 gallons per <br />da.y per feet was used for the model. <br />A value of 0.2 was used for Specific Yield which would be typical of an <br />alluvial aquifer. <br />The depletions at the pit were converted from acre-feet per month to gallons <br />per minute for use with the computer model. Table No. 4 lists the results <br />from the depletions analysis which shows the timing of the depletions at the <br />river due to the mining operation at Mid-Western Farms Resources. <br />A,; shown on Table No. 4 only 45.2 acre-feet of depletion will occur at the <br />river during the first year of operation. However, in this plan sufficient <br />replacements are being made to the stream system to offset the full <br />depletions at the gravel pit. <br />It is proposed in this plan that all replacements are made to the stream <br />during the irrigation season as a result of the dry up of 31 acres of <br />alfalfa. <br />S,. SURROUNDING KATER RIGHTS <br />A map and tabulation of surrounding water rights and well permits are <br />attached with this letter. water rights and well permits for shallow wells <br />are identified which lie within approximately 1/2 mile of the subject <br />property. Specific locations were plotted if distances from section lines <br />were provided. <br />