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i.: Michelle Matthews Page 2 September 29, 2003 Two (2) gravel pits R.B.K Baxter Road Pit (ID 1406561, DMG No. M-90-106) and Lafarge Evan's #2 Pit (ID 1406563, DMG No. 00-041) will be authorized to operate pursuant to separate substitute water supply plans (administered by MAGUA), and one other well (ID 1406316) was a past member that is included in this plan only to cover lagged depletions from pumping during previous plan years. The 18 active wells in this plan divert water for a variety of uses that include domestic use, lawn and nursery irrigation, animal watering, pond evaporation, and consumption from gravel pits. For the 2003-2004 period, there will be 165.7 acre-feet of diversions from active wells in this plan. Estimates of total pumping for the 2003 plan year are provided for each well in your Table 1. You have reported that 16.13 acre-feet of additional water will be administered by MAGUA for the R.B.K Baxter Road Pit and Lafarge Evan's #2 Pit under separate approvals. The estimate of potential out-of-priority depletions to senior surface water rights in Colorado, to be replaced during this plan year, are 127.1 acre-feet based upon the actual pumping from previous plan years, estimates of depletions based on the review of depletion information submitted for the wells pursuant to Rule 4.2d of the Rules, and the delayed response of well pumping on the surface streams. Your tables 2 and 3 (attached) show the individual well stream depletion factors and replacement requirements. Of the total amount of stream depletions, 27.7 acre-feet will accrue to Fountain Creek and 99.4 will accrue to the Arkansas River. These calculated stream depletions do not take into account depletions caused by Baxter Pit or Lafarge Evan's No. 2 pit because these gravel pits operate under their own substitute water supply plans and provide their own replacement water. The Arkansas Groundwater Users Association (AGUA} will purchase reusable return flows from the Cherokee Metropolitan District (Cherokee), to be used to replace the 2003 plan year stream depletions attributable to MAGUA's wells. The necessary replacement water, including transit losses, will be provided by agreement between AGUA and MAGUA. The RBK Baxter Road Pit and LaFarge Evans #2 Pit have separate water contracted with the Board of Water Works of Pueblo for 21.0 and 20.8 acre-feet of transmountain water or reusable return flows, respectively. MAGUA proposes to use the following specific sources and quantities of replacement water to allow continued well pumping: 1. Lease from the Cherokee Metropolitan District (Cherokee) through the Arkansas Groundwater Users_Association (AGUA~dedicated to MAGUA for up to 15_2.5 acre-feet . of reusable return flows. A transit loss of 10% on Sand Creek, 7% on Fountain Creek, and 1% on the Arkansas River between Fountain Creek and fhe points of depletion has been calculated for the Cherokee water in making replacements under this plan. This lease, after calculated stream depletions, will provide 27.7 acre-feet of replacement water on Fountain Creek and an additional 101.9 acre-feet of replacement water on the Arkansas River. The lease is valid though this approval period, March 31, 2004. Because 100% of the out-of-priority depletions to senior surface water rights in Colorado will be replaced during this plan year, no additional quantity has been determined for the replacement of depletions to usable stateline flow. The effectiveness of this replacement plan in replacing depletions to usable stateline flow will be evaluated following the end of the plan year to determine if any additional replacements are required to replace depletions to usable stateline flow caused by post-compact diversions of ground water pursuant to this plan.