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RPM,Inc. <br /> There will be no changes to the current,natural geological structure of the permitted area. All <br /> proposed operations are surface in nature removal down to the site's original topography. The <br /> geochemical conditions should improve by removing the acid forming to the offshe processing <br /> facility. <br /> 6A.21(7)(d) <br /> No monitoring stations shall be necessary. The pre-existing waste rock is being removed. <br /> 6.4.21(7)(e) <br /> There are no Designated Chemicals to be used in this operation. <br /> To avoid redundancy,the handling methods of potentially acid forming waste rock have been <br /> described above. <br /> 6.4.21(7)(f) <br /> Drainage control within the Affected Area has been considered using the U.S. Soil Conservation <br /> Service, Technical Release SS. Urban Hydrology for Small Watersheds, USDA (U.S. Department <br /> of Agriculture), June 1986 and the Federal Highway Administration Hydraulic Engineering <br /> Circulars HFC-I 1 &HEC-1 S for design guidance. <br /> 6.4.21(8)(a) <br /> On a map generated from the Colorado Division of Water Resources, in the Appendix Y,shows <br /> area water resources,consisting of wrfe6ev W0000 groundwater wells,near the proposed <br /> operation. There are no flowing streams within Yr mile of the proposed operation. <br /> 6.4.21(8)(b) <br /> There are minimal perched zones or traditionally defined aquifers known in this mountainous area_ <br /> The site is completely composed of crystalline Precambrian rocks,i.e. gneisses and schists,and <br /> tertiary intrusive rocks such as quartz monzonites overlain by 0-24"of unconsolidated material. <br /> Unconsolidated materials,soils,of between 0 to 24"overlay the crystalline rocks. The rocks <br /> themselves have essentially no porosity or permeability. Random,in-identifiable fractures due to <br /> jointing and faulting provide the only groundwater transmissivity and relative porosity. The Old <br /> Town Mine's workings effectively drain the area underneath the site,connecting the Old Town <br /> workings to the Argo Tunnel via the Hot Time Lateral. Refer to a map from USES Professional <br /> Paper 359,ECONOMIC GEOLOGY OF THE CENTRAL CITY DISTRICT GILPIN COUNTY, <br /> COLORADO,Sims.P.K.,, Drake,A. A.,and Tooker,E_ W., 1963 <br /> hydraulic conductivity for the undisturbed rock types present at the site,in-situ before mining, <br /> ranges from 10-2— 10'7 gallons per day per square foot(as reported by Freeze and Cherry (1979)) <br /> 68 <br /> 10 <br />