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be submitted with the gravel pit well permit application. LONG-TER)\9 AUGMENTATION A Water Court application for the long-term augmentation plan for evaporative losses from rile hvo unlined lakes will be filed in 2005. The applicant will maintain a substitute supple plan until long- term plan of augmentation is decreed. ~'Jhen mining is complete, two unlined lakes will remain after reclamation with planned long-term exposed surface area at the Duckworth Pit is 37.0 acres (Table No. 4). The long-term evaporative losses that must be replaced are approximately 94.5 acre-feet (Table No. 4). COMMITMENT OF N'ATER SUPPLY In the unlikely event that Lafarge would leave the site without fulfilling its augmentation obligation, the required commitment of water supp]} was prepared so the SEO could coordinate with the DMG to use the water rights to augment the long-term augmentation (Appendix D). The commitment provides sufficient consumptive use credit with the 1.0 Smith and Emmons share and 1.0 Rural Ditch share to replace long-term evaporative depletions. The Smith and Emmons share was historically used to irrigate the Duckworth propem and is still decreed for imgation. The 1.0 Rural Ditch share is included Case No. O1 CW ] 94 associates with storage at the lined Heaton Reservoir and used as the replacement source for this plan. The estimated historic use credit for 1.0 Smith and Emmons is 85.0 acre-feet per share and for 1.0 Rural Ditch share is 43.4 acre-feet. This commitment would provide replacements fordepletions to Boulder Creek from evaporation for up to 37.0 acres of exposed groundwater. The inclusion of this water in a lone-term commitment does not remove the water from its current use. Again this water supph~ would be used onh~ in the unlikely event that Lafarge abandons the Duckworth site. CONCLUSIONS AND RECOMMENDATIONS • Consumptive uses during the first two years of operations in Mining Area A include evaporation, water retained in product, and dust control. The annual consumptive use for the Duckworth Pit is estimated at 26.9 acre-feet. Storage and release of a portion of the historic use credit from Lafarge's 2.0 Rural Ditch shares at the lined Heaton Reservoir will provide replacements for all depletions associated with the mining operation throughout Water Years 2004 and 2005. The applicant will use the attached accounting form to keep monthly records of~~'ater use tier the mining operation. The existing accounting form for Heaton Reservoir will track stora~~e and releases of water attributable to Lafarge's 2O Rural Ditch shares. Page 6