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Mr. Hal D. Simpson, State L..gineer • March 16, 2000 Page 2 The total projected water consumption for the gravel pit is shown in Table 2. The pit will likely be enlarged to 4.3 acres by the end of this plan. As discussed above. 2 acres were exposed prior to December 31, 1980. Evaporation for the post-1980 area of 2.3 acres is 9.225 acre-feet. Total water consumption associated with the gravel pit, including product moisture. is 9.285 acre-feet. Stream Depletions Water consumption at the gravel pit will cause depletions to the Arkansas River, which is located about 3,400 feet north of the gravel pit. Depletions to the river were estimated using the 'Analytical Stream Depletion Model" written by D R. Schroeder of the Colorado Division of Water Resources. A specific yield of 0.20 was estimated for the alluvial aquifer. A transmissivity of 98,000 gpd per foot was interpolated from the USGS mapping of transmissiwties in Bent County. A distance of 3,400 feet from the gravel pit to the river and a distance of 10,000 feet between the edge of the alluvial aquifer and the river were measured from the USGS maps of the area. Steady state conditions occurred after seven years in which the amount of stream depletion was approximately the same as the amount of water consumption at the gravel pit. The monthly stream depletions under steady state conditions are shown in Table 2 along with the monthly water consumption values at the gravel pit. Replacement Source ° Mr. Thomeczek of Bent County Ready-Mix owns 12 shares of Fort Bent Ditch Company stock. These shares were originally part of a larger holding of 166 shares which were used to irrigate two parcels totaling 82 acres in the S'/:N'/: of sec. 2, T. 23 $„ R. 47 W. There were no irrigation wells associated with these parcels. To date, all of the 166 shares have been sold, mostly for use in substitute water supply plans: 71 shares to Mountain Prairie, LLC, 53 shares to Steve Bell, 12 shares to Bent County Ready-Mix, 25 shares to David and Dolores DiRezza, and 5 shares to Colorado Pork, LLC. These sales included dry-up of the 82 acres of which the Bent County Ready-Mix purchase from Howard Stein accounted for 5.9 acres. A copy of the Fort Bent Ditch Company stock certificate is attached as Attachment 1. Last year's approval letter for the substitute water supply plan required that the 12 shares of Fort Bent water be assessed on a dry-year basis for the plan's renewal. Each share will yield 0.59 acre-foot of historical stream depletion in a dry year as described in Attachment 2. The ditch company charges 15 percent for changing the location of the delivery point, thereby reducing the dry year yield to 0.50 acre-foot per share, or 6.0 acre-feet for the 12 shares. Mr. Thomeczek belongs to the Lower Arkansas Water Management Association (LAWMA) and will assign the shares to LAWMA. On a dry-year yield basis, the 6.0 acre-feet provided by the 12 shares are insufficient to provide the 9 3 acre-feet of replacement water required for this plan. Bent County Ready-Mix is currently seeking additional replacement water supplies for this plan. Until additional water is acquired, l-,4WMA has agreed to provide water from their sources to make up the shortage of 3.3 acre-feet. LAWMA will make the required replacements on a monthly basis from its replacement sources as per Attachment 3, enclosed. s Operation of the Plan An accounting form, Attachment 4, similar to the form submitted monthly with the previous plan, is attached. Forms will be completed monthly and submitted to the Water Commissioner. Division Engineer. and LAWMA The accounting form will summarize the exposed surface water area, the tons of aggregate mined, the moisture lost in the removal of the aggregate, and the resulting stream depletions. £O'd -J-d `uaswa~LL~M 'S ~o~LaH HLi=Oi 00-ti-1dH