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961079 04/24/2018 08.32 AM Page 7 of 18 12.1. Plan Depletions. The maximum total surface area of the South Forty Ponds is 22.6 acres. There are 15.4 acres of this exposed surface area that is attributable to mined surface area existing as of December 30, 1980 and does not require augmentation in accordance with C.R.S. 37-90-137(11)(b). Therefore, of the total 22.6 acres of exposed surface area, the remaining 7.2 surface acres require replacement of out-of-priority stream depletions due to evaporation from the South Forty Ponds. South Forty's water resource engineers have calculated that the gross annual evaporation rate for the surface area of the South Forty Ponds is 3.83 annual acre feet per acre of surface area exposed. After reduction for effective precipitation, as allowed by C.R.S. 37-92-305(12), the annual net evaporation to be replaced is determined to be 3.1 acre feet per surface acre. Accordingly, the South Forty Ponds will cause maximum depletions to the Arkansas River of 22.32 annual acre feet consisting of the net annual evaporation of 3.1 acre feet per surface area multiplied by the post-1980 surface area of 7.2 acres. The annual and monthly evaporation calculations and distributions are shown on the attached Table 1. South Forty may reduce its replacement obligations when the South Forty Ponds are fully or partially covered by ice, as approved by the water commissioner and included in the accounting. 12.2. Lauin of f Depletions. The centroid of South Forty Ponds is located an average distance of approximately 700 feet from the Arkansas River. A Glover analysis has been performed by South Forty's water resource engineers to determine lagged depletions associated with the South Forty Ponds. The results of those lagged depletions to the Arkansas River throughout the year are as set forth in the attached Table 1 with the lagging factors set forth in Table 2. Due to the close proximity of the South Forty Ponds to the Arkansas River, the lagged depletions impact the Arkansas River at a location immediately adjacent to the South Forty Ponds. 12.3. Augmentation Water Releases. Replacement water, including releases from storage, shall be supplied to meet the monthly lagged depletions from South Forty's replacement sources at or above the calling water right, located downstream of the South Forty Ponds, to correspond with the amounts and timing of stream depletions to the Arkansas River, and thereby will prevent injury to vested water rights and conditional decreed water rights. Augmentation water releases will include releases from Pueblo Reservoir, or booking over water stored in Pueblo Reservoir to other storage accounts as determined by the Division Engineer's Office. At times that an intervening downstream call between the South Forty Ponds and Pueblo Reservoir prohibits the release or booking over of water from Pueblo Reservoir to replace depletions, South Forty will coordinate with Canon City and UAWCD in order to make augmentation releases from locations, including from storage, upstream of the calling water right. Releases of augmentation water to meet monthly depletions may be accumulated and released as directed by the Division Engineer's Office. In the event that the exposed surface area of the South Forty Ponds is reduced in the future, South Forty may report such reductions to the Division Engineer's Office along with Lindner/Aug Plan Appl/Pleadings/Mtn for Entry of ROR/Final ROR Decree 2-7-2018 Clean.doc 7