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<br />will require mitigation because discharge for Pond 007 will <br />supplement the rights downstream from the pond. Hance, the <br />augmentation plan provides water primarily to the surface <br />rights on Calauoity Draw upstream of Pond o07. Mitigation is <br />required only during the irrigation season, or about 7 months <br />out of 12. Therefore, 7/12 of the pit inflow (43.8) needs to <br />be replenished during the irrigation season. This amount is <br />25.8 acre-feet. The rights that may require augmentation <br />were determined from ground-water drawdown calculations <br />provided by GeoTrans, Inc. <br />in order to account for "losses" due to timing of flows <br />and diversions, and measurement error, an administrative loss <br />• Factor of 0.5 is used. Therefore, twice the augmentation <br />amount, or 51.2 acre-feet is used to prevent impact. This <br />excess water might be used to satisfy calls for water stored <br />out-of-priority in the ponds depending on the location of the <br />call and time of year. <br />The water consumptively used by the mine, and the water <br />for augmentation to prevent potential impact to rights caused <br />by pit inflow will be provided Prom the 27 shares of <br />Colorado co-operative Company currently owned by Peabody. <br />However, this will entail obtaining permission to change the <br />use of the water to include industrial uses, and transferring <br />water from the Second Park area (Figure 2) to the NUCLA EAST <br />6 <br />• <br />GEOTItANS. INC. <br />REVISED MARCH 2006 Attachment 2.05.6(3)(b)(v)-1-11 <br />