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The Leodville Mill M1990-057 <br /> EXHIBIT A—LEGAL DESCRIPTION&LOCATION MAP <br /> Page 3-6 <br /> Colorado Division of Water Resources Management Division 2 with its division office <br /> located in Pueblo. <br /> A thin veneer of soil with a moderate to high permeability generally 8-9ft thick overlies <br /> the bedrock. However, substratum stony loam material in excess of 25ft was <br /> encountered during construction of the TSF. A thin veneer of soil with moderate to <br /> high permeability generally less than 5ft thick overlies the bedrock. 3 The surficial <br /> materials are generally not extensive enough to yield suitable quantities of water but <br /> are an important unit for recharge and shallow, seasonal groundwater. Recent studies <br /> suggest approximately 84% of the available precipitation is evaporated and only a <br /> fraction of the remaining 16% recharges the aquifer systems. <br /> The porosity of the Precambrian crystalline rocks is very low (<1%). Transmissivities <br /> are less than 10gal/day-ft (Apodaca and others, 1996). Groundwater discharge and <br /> storage in crystalline rocks occurs in fractures. Predominant recharge is from <br /> snowmelt between the middle of May and the first part of July. Water levels can vary <br /> as much as 10ft depending on the season and amount of precipitation. Depths to <br /> water in crystalline rocks generally are less than 150ft deep and depend on the <br /> topography and the fracture system. Water well yields from the majority of domestic <br /> wells are generally less than 5gpm. <br /> The alluvium and alluvial terrace deposits are the primary groundwater sources for <br /> domestic uses with well yields ranging from a few gallons a minute to over 50gpm with <br /> a mean production rate of 25gpm. Alluvial well depths range from less than 10ft to <br /> over 100ft with the mean depth of 53ft. Many of the upper basin wells record strong <br /> seasonal fluctuations with the highest water levels correlating to snow melt and spring <br /> runoff events. <br /> PFi8F to 618SWIFe, he Black G-loud the highest educ-eF of pumped <br /> gFGUndwateF-OR Lake County. Teday, gF8wndwateF pFeyides wateF feF Lake Ceunt-y <br /> de stwe <br /> Water quality in the upper Arkansas River basin alluvium is generally potable with a <br /> few exceptions of elevated metals pFedueed by e4lueAt natUFal aeod Fe drainage and <br /> septic system effluent contamination. (Groundwater Atlas of Colorado, 2003) <br /> 3 A1AR1Q4 <br /> Version 3.0 December 2020 <br />