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COOLEY RESERVOII2 AtND FULTON WII,DLIFE 4REA PIT r+.t~LENDNLENT NO. 1- ,7ERONIlVNS PROPERTY EYHIBIT G WATER INFORtVL1TION Note: The below information was prepared by the Applegate Group, Inc., who also prepared the Water Information for the existing permit area. The proposed mining operation is Located in the NE `/a of Section 16, Township 2 South, Rance 67 West of the Sixth Principal ~[eridian in Adams County. The site is located south of 104`h avenue just east of the Fulton Ditch. The operation will consist of sand and gravel production. The operation will impact the South Platte River in the form of depletions due to evaporation and operational Losses associated with mining. These impacts can be mitigated without injury to the vested senior rights downstream of the site. Currently, [here is approximately ?8.10 acres of exposed surface area at the site. it is .expected that approximately 67% of this will be filled in a[ reclamation. Of the curent total exposed surface area, approximately L3.14 acres were exposed prior to 1980. An additional 14.96 acres were exposed due to reining operations at the site after 1980. A substitute supply plan for the replacement of stream depletions during the mining phase will be submitted to the State Eneineer's Ofrice. The length of time for the completion of the project is estimated at 10 years. Water Use Water use at the site will include evaporation from groundwater exposed to the atmosphere after 1980, water retained in material removed from the site and water for dust control. The site will be wet mined, therefore the only exposed groundwater will 'oe from the existing ponds. Thus, the total exposed surface area during reining is estimated at 14.96 acres. The NOA.A Technical Report NWS 33, Evaporation Atlas for the Contiettous 48 States (U.S. Department of Commerce) was used to determine gross evaporation. For this location, the annual evaporation is 42 inches- Ytonthly evaporation percentages as suggested by the Of~ice of the State Engineer were used to calculate monthly evaporation. Precipitation was estimated from the High Plains Regional Climate Center for the Northoienn Weather Station. Annual Precipitation at the site was assumed to be equal io the Northglenn Station, which is 14.08 inches. Effective precipitation was calculated as 70% of the total precipitation. Nei evaporation was then computed as the difference be*.ween Bross evaporation and effective orecpitation. The get annual evaporation at the site is 270 feet. Thus, the resulting net annual evaporative consumptive use during cY;e mining operation is 40.39 acre-`eel. Following mining, material will be processed off site. The water retained in this material is considered as a consumptive use. the anticipated amount of mate:;al that will be mined and washed from the site each year is estimated at 300,000 tons of raw material. 2