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will be produced from alluvial well #1551F, as shown in Figure 1. All of this use is considered <br />100 percent consumptive. Table 1 presents the water consumption for the aggregate mining site. <br />Table 1 presents a summary of the amount of free water surface evaporation from the 02 acres <br />of dewatering trenches and a 4 acre silt pond, the water retained in the aggregate product, the <br />concrete batch plant and the dust suppression. The total estimated water consumption for the <br />Nissen mine is 45.30 acre-feet annually. Enclosed is a map showing NOAA pan evaporation. <br />The tota145.30 acre-feet of annual consumption will result in a depletion to the South Platte <br />River. Monthly river depletions were estimated using the Jenkins Stream Depletion Factor <br />(SDF) method with an assumed SDF value of 8 days. Table i shows the estimated 2004 and <br />2005 lagged mining depletions assuming that the mining commences in 2004. Even though the <br />pit will be mined prior to the commencement of mining operations, it will be necessary to <br />provide augmentation coverage for the uses associated with the alluvial well I SS 1 F and the <br />limited surface water trapped inside of the slurry wall in accordance with SEO policy. <br />Augmentation Water Supply <br />The water supply for the Nissen aggregate mine is 0.6 shares of Lower Latham Ditch and 2.25 <br />shares of Lower Latham Reservoir. The Lower Latham Ditch has four water rights as shown in <br />the table below. The Lower Latham Reservoir has the priorities as shown below. <br />WATER RICHT NAME AA/DATE AFRO DATE ADMP7 N0 USE TYPE RATE ABS (cfs) <br />LOWER LATHAM DITCH Apil 4, 1883 May 12, 1869 7072 rRRCOMINDFDLDOMS7XAUG 20.4 <br />LOWER LA77iAM D1TCH April d, 1883 Decanbcr 12, 1874 91121RRCOMWDFTRDOMSTKAUG 35.77 <br />LOWFR LAT)IAM DITCH Apri14, 1883 November 14, 1877 ]0180IRRCOMWDFIRDOMSTKAUG 97,68 <br />LOWER LATHAM DITCH Apri14, 1883 Onober 24, 1881 11620 n2RCOM[NDFIRDOMSTKAUG 133.88 <br />LOWER LATHAM Dn'CH Augml 1,1981 7we 6, 1895 [6607 STO 34 <br />LOWER LATIIAM RES August 2, 1918 7tmc 2i, 1889 177061RR <br />LOWER LATHAM RES Augusl2, 1918 hmc 24, 1900 18437 DtR <br />LOWER LATHAM RL•S November 12, 1924 August 7, 19t 5 25050.73959 IRR <br />Table 2 presents a summary of the replacement sources for 2004 pit depletions totaling 39.51 <br />acre-feet and the 2005 42.32 acre-feet depletion. In addition to the pit depletions, Table 2 <br />presents the monthly estimated historic returns attributed to the 0.60 shares of Lower Latham <br />Ditch and 2.25 shares of Lower Latham Reservoir that will be used to cover depletions attributed <br />to the Nissen pit mining operation. <br />t3istoric Use of Lower Latham Ditch and Reservoir <br />The 0.60 shares of Lower Latham Ditch and 225 shares of Lower Latham Reservoir will be <br />released to the South Platte River at the mining site to cover mining depletions attributed to the <br />Nissen mine. The 0.60 shares of ditch water is a portion of the 2.S shares and the 2.25 shares of <br />reservoir water were historically used to irrigate 50 acres of corn, 20 acres ofalfalfa and 50 acres <br />of pasture grass on the Nissen farm as shown on Figure 2. In addition to the ditch and reservoir <br />Water Rights • Hydrology • Hydraulics • Water Quality <br />1(a1.ea Pl Ia1P(bavcl 1'itsitiru~th Platte~Rein Nic rn Pit TSSP Request Iztter_Mc <br />