2003-02-12_REVISION - M1999034 (2)

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COOLEY RESERVOIIt AND FULTON WILDLIFE AREA PTT A~IENDiVIENT NO. 1 - JERONINIUS PROPERTY EAHIBIT G WATER INFORNIt1TION 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 Y of Section I6, Township 2 South, Range 67 West of the Sixth Principal Meridian 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 mitring. Tfiese 11upaCtS l'i^_ CC nL':~2te:1 .`.~1:hC4't :Pj L:j ... u... '.'BS:.... J.'....v. :~,7tS uu .v uSir.'.aTi v^I iuc site. Currently, there is approximately 28.10 acres of exposed surface area at the site. It is expected that approximately 67% of this will be filed in at reclamation. Of the current total exposed surface area, approximately 13.14 acres were exposed prior to 1980. An additional 14.96 acres were exposed due to mining 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 Engineer's Ofice. 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 be from the existing ponds. Thus, the total exposed surface area during mining is estimated at 14.96 acres. The NOAA Technical Report N~VS 33, Evaporation Atlas for the Contiettous 48 States (U.S. Deparhnent of Commerce) was used to determine gross evaporation. For this location, the annual evaporation is 42 inches. Monthly evaporation percentages as suggested by the Office of the State Engineer were used to calculate monthly evaporation. Precipitation was estimated from the High Plains Regional Climate Center for the Northglenn Weather Station. Armual Precipitation at the site was assumed to be equal to the Northglenn Station, which is 14.08 inches. Effective precipitation was calculated as 70% of the total precipitation. Net evaporation was then computed as the difference between gross evaporation and effective precipitation. The net annual evaporation at the site is 2.70 feet. Thus, the resulting net annual evaporative consumptive use during the mining operation is 40.39 acre-feet. Following mining, material will be processed oil site. The water retained in this material is considered as a consumptive use. The anticipated amount of material that will be mined and washed from the site each year is estimated at 300,000 tons of raw material. 2