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'o:; os; 00 II'ED 1J:59 F.a3 IiJjoo3 <br />• • <br />The calculation of time of travel from the southwestern mine permit boundary to the <br />town's nearest drinking water-supply well was performed using values for aquifer parameters of <br />the Alamosa Formation within which the town's drinking water-supply wells aze completed. The <br />hydrogeological assessment that was performed for the area and presented in my letter of January <br />18, 2000 indicated that the southwest permit boundary azea of the facility is underlain by the <br />Santa Fe Formation, a low permeability unit. it is between this area of the facility and town that <br />the Alamosa Formation will become the ground-water pathway of concern. Therefore, the <br />approach is ultraconservative as per the State's drinking water protection programs as it will be <br />the Alamosa Formation that will be evaluated for development of the WHPA/S WfW for the <br />town's wells. Based on this approach, the estimated time of travel of 15 yeazs frorn the <br />southwestern extreme of the mine permit boundary to the neazest well exceeds the State policy <br />value for drinkirg water protection by a factor of 2. Therefore, this facility would not fall within <br />the WHPA/SWAA based on the ground-water flow pathway alone under the State's policy and <br />ultraconservative approach to delineation. <br />If you should have any questions, please feel free to contact me at 303-312 6595. <br />Sincerely, <br />Rich Muza, Hydrologist <br />Ecosystems Protection Program <br />Office of Ecosystems Protection and Remediat;on <br />cc. Juanita Bernal, SLWSD <br />Mike McGowan, CCCD <br />Jim Dillie, CDNR-DMG <br />Carol Russell, 8EPR-EP <br />O <br />