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Donald E. Frick, E.I.T. South Platte Combined Replacement Plan November 14, 2006 Page 10 of 12 along with mapping showing any revisions to the dry up acreage. Credit from any dry-up fields containing alfalfa or native grass will be assessed in the following manner: (a) For fields deep tilled or chemically treated to successfully kill alfalfa or native grass, 100% credit will be given for consumptive use as otherwise computed under the conditions of this approval. (b) For fields not deep tilled or chemically treated to successfully kill alfalfa, records of monthly monitoring of depth to groundwater at existing irrigation wells or existing or new monitoring wells or piezometers within'/.-mile of each alfalfa or native grass field must be maintained. Credits will be reduced according to the following table when depth to groundwater is less than the depth assumed to provide no significant contribution to alfalfa growth. Measurements taken at the start of each month will determine the necessary reduction in credit to be applied during the following month. The applicant may use another methodology upon review and approval by the State Engineer and Division Engineer. Depth to Ground F Percent Reduction in CU Credit' Water ( eet) Native Grass Alfalfa 1 85% 100% 2 50% 90% 3 30% 75% 4 20% 50% 5 15% 35% 6 10% 20% 7 5% 15% 8 0% 10% 1. Adapted from EVAPOTRANSPIRATION AND AGRONOMIC RESPONSES IN FORMERLY IRRIGATED MOUNTAIN MEADOWS, South Park, Colorado, March 1, 1990; Revised September 1, 1991 12. The replacement water, which is the subject of this plan cannot be sold or leased to any other entity. As a condition of subsequent renewals of this substitute water supply plan, the replacement water must be appurtenant to this site until a plan for augmentation is obtained. A copy of this approval letter should be recorded with the county clerk and recorder. All replacement water must be concurrent with depletions in quantity, timing, and locations. The use of replacement water must be in compliance with all agreements with the providers of replacement water. 13. Dewatering at the pits will produce delayed depletions to the stream system. As long as the pit is continuously dewatered, the water returned to the stream system should be adequate to offset the depletions caused by dewatering. However, once dewatering at the site ceases, the delayed depletions must be addressed. At least three years prior to completion of mining, a plan must be submitted that specifies how the post pumping dewatering depletions will be replaced in time, place and amount.