2012-01-09_HYDROLOGY - M2008078 - Laserfiche WebLink

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Kimberly Frick Page 2 January 9, 2012 Depletions Lagged depletions to the Arkansas River were calculated by using the AWAS model, and an interpolated stream depletion factor of 88 days ( "Stream Depletion Factors, Arkansas River Valley, Southeastern Colorado" by C.T. Jenkins and O. James Taylor; USGS OFR 72- 192). A summary of the lagged monthly stream depletions is shown in the attached Table 3. No groundwater will be used for equipment washing, concrete production, reclamation or any other purpose. Total monthly depletions for each use will be limited to the totals provided in your Table 2. No groundwater was exposed within the permit boundary prior to January 1, 1981. No phreatophyte credit has been applied to this plan. Replacement The proposed source of replacement water is GP Ranches' ownership of 284 common shares in the Lower Arkansas Water Management Association ( "LAWMA "). Only 37 LAWMA shares will be dedicated to this plan. This water will cover depletions throughout the entire year. A transit loss will be accounted for by LAWMA as part of their agreement with GP Ranches. If the LAWMA share yield is reduced from the current projection of 0.85 acre -feet per share, more shares will be dedicated to the plan. Long -term Augmentation Obligation After mining and reclamation is complete, the applicant will construct a lined reservoir with a total surface area of approximately 183 acres. The applicant is in the process of obtaining a corporate surety bond for the West Farm Pit allowing the site to be bonded for lining or backfilling the pit in the rare event that GP Ranches ceases mining and abandons the site. Conditions of Approval 1. This plan shall be valid through April 30, 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 February 1, 2012. 2. Applicant must provide the name, address and phone number of the person who will be responsible for the operation of the plan to this office, the division engineer, and the water commissioner within 20 days of the receipt of this approval. 3. A well permit, Permit No. 68754 -F, has been obtained for the current uses (including dewatering) and exposed pond surface area of the gravel pit in accordance with §37 -90- 137(2) and (11), C.R.S. The permit was issued on August 26, 2009, and extended until August 26, 2011. If mining has not yet commenced upon expiration of the extended permit, the applicant must reapply for a new well permit and this substitute water supply plan will be invalid until a new permit to expose groundwater is obtained. 4. The water consumption and depletions associated with this mining operation must not exceed those amounts listed on the attached Table 2. The total area of exposed groundwater shall not exceed 0.61 acres and total consumptive use shall not exceed 30.8 acre -feet of which 2.5 acre -feet is due to evaporative loss and 28.3 acre -feet is industrial consumptive use. Documentation of pond size may be required by the