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water, wells # 1551 F and #13255 were used as a supplemental supply to the 120 acres. The <br />Lower Latham water rights were historically delivered to the 120 acres via the Smith Lateral as <br />shown on Figure 2. <br />Table 3 presents a summary of the historic use for the period 1969 - 1996 for the 2.5 shares of <br />Lower Latham Ditch and the 2.25 shares ofI.ower Latham Reservoir used on the Nissen Farm. <br />The consumptive use attributed to both the 2.5 shares of ditch water and the 225 shares of <br />reservoir water was estimated using a maximum field application efficiency of 63 percent and <br />the modified Blaney-Griddle method. Tables 4 and 5 show the river headgate diversions of the <br />Lower Latham Ditch and the calculated reservoir releases of the Lower Latham Reservoir. In <br />addition, Table 3 presents the pro-rata farm headgate deliveries of the 2.5 shares of ditch water <br />and the 2.25 shares of reservoir releases, assuming a 20 percent ditch loss. There are 200 <br />outstanding shares in the Lower Latham Ditch and 156 outstanding shares in the Lower Latham <br />Reservoir. Table 3 also shows the prorated consumptive use of 2.5 shares ditch water and the <br />2.25 shares of reservoir water and the lagged returns associated with both sources. It was <br />assumed that 50 percent of the return flow volume returned to the river as sub-surface and the <br />other 50 percent was surface return flow. The one-site groundwater return flows were lagged <br />back to the South Platte River using an 8 day stream depletion factor determined from Huds <br />1965 SDF maps. <br />Conclusions <br />The 4530 acre-feet of average annual pit depletions will be replaced using 0.60 shares of Lower <br />Latham Ditch and 2.25 shares of Lower Latham Reservoir via duect release to the South Platte <br />River. <br />Figure 2 shows all wells located in the vicinity of the proposed Nissen Pit. There are three wells <br />that wilt be located within 600 feet of the mining azea. However, since the pit will be lined prior <br />to when mining operations commence, the de-watering activities associated with the wells will <br />not cause injury to these three wells. The operation of this TSSP pwsuant to the conditions <br />established herein, will result in no injury to senior water rights on the South Platte River. <br />Enclosures <br />ce: Kim Lawrence <br />Jeff Gregg <br />Water Rights • Hydrology • Hydraulics • Water Quality <br />i:'~IzaNlall\Cravel Pits\Soulh Platte\Rein Nissen Pil TSSP Reyuesl IxLLer.doc <br />3 <br />Sincerely, <br />