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REPLACE>\1ENT ~0'ATER The total calculated mining depletions for the Duckworth Pit for the remainder of Water 1"ear 2004 are ] 2.3 acre-feet with only 2.5 acre-feet of the lagged depletions being realized at Boulder Creek (Table No. 3). ]n 2005, the total calculated depletions for the mining operation are 26.9 acre-feet with approximately 14.8 acre-feet of lagged depletions requiring replacement (Table No. 3). Replacements will be made from the storage and release of water from a lined reservoir owned by Lafarge known as Heaton Reservoir (Figure No. 1). Lafarge owns 2.0 Rural Ditch shares, which have been approved by the SEO in a H.B. 14]4 SWSP and are included in Case No. O] CW 194 for storage and release from Heaton Reservoir. The SWSP for Heaton Reservoir yeas appro~'ed by the SEO in a letter dated August 28, 2003. The liner for Heaton Reservoir was approved in a letter from Dave Nettles dated April 7, 2003. Copies ofboth letters are included in Appendix B. The historic accretions and depletions for the 2.0 Rural Ditch shares was determined to be 86.8 acre- feet and was approved by the SEO in the SWSP (Table No 3). The total historic farm headgate delivery for these 2.0 shares is 174.5 acre-feet (Table No. 3). Condition No. 3 of the S'.'•'SP approvals sets the historic farm delivery as the annual volumetric limit that can be diverted into Heaton Reservoir. The required portion of the annual diversion into.Heaton Reservoir will be released to meet return flow obligations for the 2.0 shares. The applicant previously developed and submitted to the SEO an accounting form to track the Heaton Resen~oir operations. This form will be utilized by Lafarge to track reservoir operations. A copy of this accounting form is included in Appendix B. Lafarge proposes to store its 2.0 Rural Ditch shares in Heaton Reservoir and then pump the water directly for use in a concrete batch plant that lies adjacent to the reservoir known as the Heaton Batch Plant. The Rural Ditch water will be diverted and delivered to Heaton Reservoir through an existing lateral and a flume and recorder will be installed to measure diversion rates and volumes. A>.'ater will be pumped out of Heaton Reservoir to make mining replacements according to the timing shown in Table No. 3. An existing batch plant at the Heaton Reservoir pumps up to a maximum of41.4 acre-feet per year of the historic consumptive use credit from the Rural Ditch shares stored in the reservoir. Alain, the 2.0 shares have 86.8 acre-feet ofhistoric use credit ofwhich only41.4 acre-feet will be consumed at the concrete batch plant. There will be sufficient excess historic consumptive use credit remaining in the reservoir to make replacements for the mining depletions associated with the Duckworth Pit throughout 2004 and 2005 (Table No. 3). Since Heaton Reservoir makes releases inro St. Vrain Creek. just downstream from the confluence with Boulder Creek, District 5 Water Commissioner Scott Edgar was contacted and he gave his approval for the releases from the Heaton Pit for replacements For this site. Mr. Edgar coordinates releases from the Heaton Pit under the current SWSP. Holvever. the Duckworth Pit depletions occur in District 6. y~~ater Commissioner Bob Carlson was contacted, and he cave his approval for the use of the 2.0 Rural Ditch shares and Heaton Reservoir Page 4