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Heidi Frey <br />February 4, 2011 <br />Page 4 <br />replaced by irrigation credits from 45.4 acres of historically irrigated acreage taken out of production <br />by the mining area. The irrigation credits needed to replace the total mining depletions are diverted <br />from the Arkansas River at the Lester-Attebery Ditch headgate and delivered to the Phase 1 pond. This <br />will ensure that any lagged depletions to the river are replaced in time. The deliveries to the Phase 1 <br />pond are measured through a 2-foot weir by a Sutron SDR continuous recorder. The remaining <br />depletions not covered by irrigation credits (28.70 ac-ft in 2011 and 30.17 ac-ft in 2012) will be <br />replaced in time and amount by releases from a portion of Transit Mix's 60 shares of Twin Lakes <br />Reservoir water. During the non-irrigation season, the Twin Lakes water needed to replace mining <br />depletions will be diverted at the Lester-Attebery Ditch headgate and delivered to the Phase 1 pond <br />through the 2-foot weir. Any Twin Lakes water needed to replace historical wintertime irrigation <br />return flows will be left in the Arkansas River. <br />The actual monthly depletions presented in Table 3 may vary slightly on a monthly basis, so long as <br />the total depletions do not exceed 78.31 ac-ft in 2011 and 88.74 ac-ft in 2012. Actual monthly <br />depletions from the mining operation will be calculated on a monthly basis based upon the proposed <br />accounting form in Table 4. Transit Mix's mining operation, as set forth in this plan, will not cause <br />injury to other water users on the Arkansas River. <br />We hope that this information provides you with a complete understanding of Transit Mix's mining <br />operation and water replacement plan at the Grisenti site. If you have any questions or need any <br />additional information to complete the review of this plan please give us a call. <br />Very truly yours, <br />BISHOP-BROGDEN ASSOCIATES, INC. <br />Julia Keedy, E.I. J <br />Water Resources Engineer <br />Reviewed by: <br />Christopher J. Sanchez, P.G. <br />Principal / Hydrogeologist <br />JAK/jeb <br />Enclosures <br />cc: Bud Herskind <br />Chris Usry <br />9107.08