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Donald E. Frick, E.I.T. South Platte Combined Replacement Plan November 14, 2006 Page 6 of 12 Rural Ditch Pursuant to a lease agreement between Aggregate and the owner of the Larson Pit, Aggregate has the right to use 0.67 shares in the Rural Ditch. The 0.67 Rural Ditch shares are a part of 2 shares that were historically used to irrigate 78 acres of alfalfa/grass mix. Assuming a 10% ditch loss and a 60% irrigation efficiency, the dry-year consumptive use of the 0.67 shares was determined to be 32.9 acre-feet. Since the original SWSP approval, the landowner has diverted the farm headgate diversions for the 0.67 shares, into an adjacent recharge site and the Larson Pit itself. The recharge accruing to the stream during this plan period are 41.2 acre- feet. Currently the plan is estimating replacements from the Rural Ditch based on the applicant's pro- rata delivery of the Rural Ditch shares. Prior to any further deliveries into the Larson Pit the applicant must Install measuring devises, approved by the water commissioner, to properly measure the diversion of Rural Ditch water into the Larson Pit. City of Lonomont Lease Aggregate is not proposing to use fully consumable water leased from the City of Longmont in this plan since the replacement water is not required. However, Aggregate may use the sources in future plans to supplement the current augmentation water. Plum Creek The SWSP request submitted by aggregate in December of 2005 proposed to use leased water from Silver Heights Water and Sanitation District as a replacement source under this plan. Silver Heights Water and Sanitation District has not provided accounting to the water commissioner, therefore the leased water cannot be accounted for and credit cannot be given. According to the Applicant the Lawrence Wash Plant was backfilled in April 2006 and all lagged depletions from the exposure of 1 acre of pond surface area was replaced with excess fully consumable effluent released at Metro. South Platte River Replacement Sources Total CU credit CU credit for this Ian Comments Centennial 30.0 30.0 Available throw hout the ear Westminster 1998 294.79 294.79 Available throw howl the ear Thornton Effluent 12.2 12.2 November -March onl Fulton Ditch 168.13 168.13 96 Shares total Bri hton Ditch 184.5 184.5 1.323 Shares total Westminster 1999 515.71 515.71 November-March onl New Brantner Ditch 55.37 55.37 5.75 Shares total Old Brantner Ditch 0.0 0.0 11 Shares total, no share applied to this Ian Centennial Lease Aggregate conveyed water rights in exchange for a lease of augmentation water in an agreement with Centennial Water and Sanitation District in 1996. The agreement requires Centennial to provide Aggregate 30 acre-feet of fully consumable water each year. The rate of delivery for the 30 acre-feet cannot exceed 0.5 cfs, but can be taken at any time throughout the year.