2012-05-22_HYDROLOGY - M1999005 - Laserfiche WebLink

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Mr. Frank Healy Page 2 May 21, 2012 Depletions The total water surface area for the two ponds at the site is presently 10.61 acres (Figure 2). For the purpose of this SWSP, you determined the evaporation from the 10.61 acres to be 42.65 acre -feet, based on a net annual evaporation of 4.02 feet from the Lower Arkansas Water Management Association's ( "LAWMA ") decree in Case No. 2002CW181. The gravel pit is located about 300 feet north of the Arkansas River. A Glover analysis was used to estimate the timing of stream depletions. A stream depletion factor of 7.5 days was taken from "Stream Depletion Factors, Arkansas River Valley, Southeastern Colorado" by C.T. Jenkins and O. James Taylor (USGS OFR 72 -192). Steady state conditions were assumed and the monthly water uses estimates from Table 1 (attached) were used. Replacement All -Rite leased fully consumable water from AGUA and will use this leased water as the source of replacement water during the period of this SWSP. A copy of the current lease for 40 acre -feet for the period ending March 31, 2012 was provided with the SWSP request and is attached to this letter. All -Rite will renew the lease with AGUA for 43 acre -feet for the period of April 1, 2012 through March 31, 2013. A copy of the new lease with AGUA must be provided to this office by June 4, 2012 in order for this SWSP to remain valid. Accounting The attached Table 2 is the monthly accounting form that will be used for determining water use and stream depletions. All -Rite will submit the monthly pit area, product mined, and diversions from the pit for dust suppression to AGUA, which will then submit the monthly water accounting to the Division Engineer. 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. Except as noted in condition no. 2 below, this SWSP is approved with the effective date of January 1, 2012 and shall be valid through December 31, 2012 unless otherwise revoked or modified. 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 (currently $257) no later than November 15, 2012. 2. The Applicant shall provide a copy of the lease with the AGUA by March 31, 2012 for the fully consumable replacement water to replace depletions from the operation of this gravel pit site. The Applicant shall provide a copy of the lease to the SEO, division engineer, and water commissioner. If a lease is not provided by June 4, 2012, this plan shall expire on that date and all use of water under this SWSP must cease immediately. 3. The total surface area of the ground water at the North River Pit site must not exceed 10.61 acres during the SWSP period which results in a maximum evaporative annual loss of 42.65 acre -feet. 4. Total consumption at the North River Pit site must not exceed the aforementioned amounts unless an amendment is made to this SWSP.