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<br />will require mitigation because discharge for Pond 007 viii <br />supplement the rights downstream from the pond. Hence,. the <br />augmentation plan provides valet primarily to the surface <br />rights on Calamity Dray upstream of Pond 007. Mitigation is <br />required only during the irrigation season, or about 7 months <br />out of 12. Therefore, 7/13 of the pit inflow (63.8) 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-eater drawdovn 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 eater <br />for augmentation to prevent potential impact to rights caused <br />by pit inflow will be provided from the 27 shares of <br />Colorado Co-operative Company currently owned by Peabody. <br />However, this vii l~~entail obtaining permission to change the <br />use of the water to include industrial uses, and transferring <br />eater from the Second Park area (Figure 2) to the NUCI1+ EAST <br />6 <br />GEaTRANS, INC. <br />• xevssH~MAxcHioos Attachment 2.05.3(3)-16-51 <br />