2003-07-31_PERMIT FILE - M2003001

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Table 1 presents a summazy of the amount of free water surface evaporation from the 0.2 acres of dewatering trenches and a 4 acre silt pond, the water retained in the aggregate product, the concrete batch plant and the dust suppression. The total estimated water consumption for the Nissen mine is 45.30 acre-feet annually. Enclosed is a map showing NOAH pan evaporation. The tota145.30 acre-feet of annual consumpton will result in depletions to the South Platte River. Monthly river depletions were estimated using the Jenkins Stream Depletion Factor (SDF) method with an assumed SDF value of 8 days. Table 1 shows the estimated steady state lagged mining depletions. Even though the pit will be mined prior to the commencement of mining operations, it will be necessary to provide augmentation coverage for the uses associated with the alluvial well 1551F and the limited surface water trapped inside of the slurry wall in accordance with SEO policy. Aagmentatlon Water Supply The water supply for the Nissen aggregate mine is 0.6 shazes of Lower Latham Ditch and 2.25 shares of Lower Latham Reservoir. The Lower Latham Ditch has four water rights as shown in the table below. The Lower Latham Reservoir has the priorities as shown below. WATER RIGHT NAME ADJ DATE AFRO DATE ADMIN NO USE TYPE RATE ABS (cbl LOWER LATHAM DITCH April 4, 1883 May 12, 1869 7072 IRRCOMINDFIRDOMSIKAUG 20.4 LOWER LATHAM DITCH April 4, 1883 Decades 12,1871 9112 IRRCOMMDFIRDOMSTKAUG 35.77 LOWER LATNAM DITCH Apn14, 1883 November 14, 1877 10180 IRRCOMINDFIRDOMSfKAUG 97.66 LAWER LATHAM DITCH Apn14, 1863 Ocbba24, 1881 ]1620IRRCOMINDFIRIlOM5rKAUG 133.86 LOWER LATIIAM DITCH August 2, 1981 June 6.1895 16607 Sr0 30 LOWER LATIIAM RES August 2, 1918 lime 23, 1889 ]7706 IRR LOWER LATHAM RES August 2, 1918 June 24, 1900 ]64371RR LOWER LATHAM RFS November 12, 197A Auguv 7, 1915 25050.23959 IRR Table 2 presents a summazy of the replacement sources for pit depletions totaling 45.30 acre- feet. In addition to the pit depletions, Table 2 presents the monthly estimated historic returns attributed to the 0.60 shares of Lower Latham Ditch and 2.25 shazes of Lower Latham Reservoir that will be used to cover depletions attributed to the Nissen pit mining operation. Historic Use of Lower Latham Ditch and Reservoir The 0.60 shazes of Lower Latham Ditch and 2.25 shares of Lower Latham Reservoir will be released to the South Platte River at the mining site to cover mining depletions attributed to the Nissen mine. The 0.60 shares of ditch water is a portion of the Z.5 shazes and the 2.25 shares of reservoir water were historically used to irrigate 50 acres of corn, 20 acres of alfalfa and 50 acres of pasture grass on the Nissen farm as shown on Figure 2. Tn addition to the ditch and reservoir water, well #1551F was used as a supplemental supply to the 120 acres. The Lower Latham water rights were historically delivered to the 120 acres via the Smith Lateral as shown on Figure 2. Water Rights • Hydrology • Hydraulics • Water Quality E_1LSaflHalPGravel PitslSoulh PlatteVLein Revised Nissen Pit T$$P Rtqucst Let[er.doc 2