2008-02-04_PERMIT FILE - M2008006

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inches was used to calculate evaporative consumptive use at the site. Effective precipitation was calculated as 70% of the total precipitation, or 0.7 feet. The net annual evaporation, the difference between the gross and effective precipitation, is approximately 2.6 acre-feet per acre, resulting annual evaporative consumptive use during the mining operation is approximately 1.3 acre-feet. Operational Consumptive Use Operational losses at the site consist of water lost in product hauled off-site and water used for dust control. The maximum annual gravel mine production is estimated at 202,500 tons of raw material. The moisture content of the material hauled off the site was assumed to be four percent by weight; this results in an annual amount of approximately 6.0 acre-ft/year of water retained in the product. Dust control is required for internal haul roads and stockpiles. From previous experience in mining operations similar to this one, a reasonable estimation of two ac-ft per year was used in determining the total consumptive use of the mining operation. The total annual consumptive use for the sand and gravel operation and the quarry is 10.1 acre- feet. The total annual consumptive uses associated with the mining operations are as follows: Net annual Evaporation (acre- eet/acre o exposed groundwater) 1.28 Moisture Retained in Product (acre- eet/year) 5.96 Dust Control (acre- eet) 2.00 Total (acre-feet) 9.2 Concurrent with mining, a compacted clay liner will be constructed around the pit. Following mining, a reservoir will be created at the mining site with a surface area of approximately 20 acres. Replacement Water The replacement of consumptive uses will be accounted for in a Substitute Water Supply Plan (SWSP) that is administered by the State Engineer. The following sources may be utilized to provide the necessary replacement water for the site during mining operations: • Lower Poudre Augmentation Company Recharge Project: Connell Resources proposes to make replacements through the Lower Poudre Augmentation Company's (LPAC) recharge program. Connells will dedicate New Cache la Poudre Irrigation Company shares to the program in exchange for augmentation water. The recharge program is currently operating under a substitute water supply plan pending approval of associated Water Court cases 04CW025 and 06CW295. The New Cache la Poudre Irrigation Company operates the augmentation plan and makes replacements. • Box Elder Ditch: In the unlikely event that the Lower Poudre Augmentation Company recharge project is unable to augment SerFer Pit depletions, CRI will divert Box Elder Ditch shares into their recharge pond at the Timnath-Connell Pit, M-99-50, to make full replacements for all mining depletions. Starting in Water Year 2002, CRI has recharged SerFer Project DBMS 112 Permit Page 12