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11 <br />Jesse Lee SWSP Pit <br />January 8, 2013 <br />Page 2 <br />In accordance with approach nos. 1 and 3, you have indicated that a bond has <br />been obtained for $32,000 through the Division of Reclamation, Mining, and Safety <br />("DRMS ") to assure that depletions from groundwater evaporation do not occur in the <br />unforeseen event, or events, that would lead to the abandonment of the Pit. <br />Depletions <br />The anticipated net depletions for this SWSP are 2.32 acre -feet per year. The currently <br />exposed groundwater at the site totals 0.40 acres, within the existing ponds (0.38 acres) and a <br />drainage ditch (0.02 acres). The drainage ditch is approximately 350 feet long and approximately <br />two feet wide and gravity drains any water trapped within the port to the existing ponds. Gross <br />annual evaporation at the gravel pit location is estimated to be 39.0 inches per year. Using the <br />climate data from the Buena Vista weather station the net evaporation for the 0.40 acres <br />exposed at the site is estimated to be 1.06 acre -feet. <br />You have provided a monthly breakdown of the annual depletions made up of 1.06 acre - <br />feet of net evaporative loss, 0.26 acre -feet of water lost with the mined product (which <br />represents 9,000 tons of mined product), and 1.00 acre -feet of water used for dust control. <br />These depletions have been lagged to the Arkansas River. The aquifer parameters used <br />in the stream depletions model are as follows: 1) X =250 feet (distance from the centroid of the <br />exposed surface area to the river), 2) W =2,300 feet (distance from the aquifer impermeable <br />boundary to the river channel), 3) T= 50,000 gal /day /foot (transmissivity of the alluvial aquifer), <br />and 4) S =0.2 (specific yield). <br />Replacement <br />The proposed source of replacement water for this pit is a lease of fully consumable <br />water from the Upper Arkansas Water Conservation District. A copy of the lease water provided <br />to this office with the SWSP request and is attached to this letter. Transit losses will be as <br />assessed by the Division Engineer. <br />The monthly depletions and replacement requirements are found on the attached Table <br />3. <br />Conditions of Approval <br />I hereby approve the proposed substitute water supply plan in accordance with §37 -90- <br />137(11), C.R.S. subject to the following conditions: <br />1. This SWSP shall be valid for the period of November 1, 2012 through October 31, 2013, <br />unless otherwise revoked, modified, or superceded by decree. If this plan will not be <br />made absolute by a water court action by the plan's expiration date, a renewal request <br />must be submitted to this office with the statutory fee by September 15, 2013. <br />t <br />