2014-06-06_HYDROLOGY - M1984043 - Laserfiche WebLink

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Jesse Lee SWSP Pit Page 2 June 4, 2014 events, that would lead to the abandonment of the Pit. Depletions The anticipated net depletions for this SWSP are 2.32 acre-feet per year. The currently exposed groundwater at the site totals 0.40 acres, within the existing ponds (0.38 acres) and a drainage ditch (0.02 acres). The drainage ditch is approximately 350 feet long and approximately two feet wide and gravity drains any water trapped within the port to the existing ponds. Gross annual evaporation at the gravel pit location is estimated to be 39.0 inches per year. Using the climate data from the Buena Vista weather station the net evaporation for the 0.40 acres exposed at the site is estimated to be 1.06 acre- feet. You have provided a monthly breakdown of the annual depletions made up of 1.06 acre-feet of net evaporative loss, 0.26 acre-feet of water lost with the mined product (which represents 9,000 tons of mined product), and 1.00 acre-feet of water used for dust control. These depletions have been lagged to the Arkansas River. The aquifer parameters used in the stream depletions model are as follows: 1) X=250 feet (distance from the centroid of the exposed surface area to the river), 2) W=2,300 feet (distance from the aquifer impermeable boundary to the river channel), 3) T=50,000 gal/day/foot (transmissivity of the alluvial aquifer), and 4) S=0.2 (specific yield). Replacement The proposed source of replacement water for this pit is a lease of fully consumable water from the Upper Arkansas Water Conservancy District. A copy of the lease water was provided to this office on October 18, 2013 and is attached to this letter. Transit losses will be as assessed by the Division Engineer. The monthly depletions and replacement requirements are found on the attached Table 3. Conditions of Approval I hereby approve the proposed substitute water supply plan in accordance with §37-90-137(11), C.R.S. subject to the following conditions: 1. This SWSP shall be valid for the period of November 1, 2013 through October 31, 2014, unless otherwise revoked, modified, or superceded by decree. If this plan will not be made absolute by a water court action by the plan's expiration date, a renewal request must be submitted to this office with the statutory fee by September 15, 2014. 2. The total surface area of the groundwater exposed at the Jesse Lee pit must not exceed 0.40 acre during the approval period of this SWSP resulting in an annual evaporative loss of 1.06 acre-feet. 3. The annual amount of water used at the operation shall not exceed 1.0 acre-foot for dust control and the total product mined shall not exceed 9,000 tons per year above the groundwater surface resulting in 0.26 acre-feet of water lost with the product.