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0209.00 {9ED 1J:59 FAS <br />• <br />• <br />f~ OOJ <br />The calculation of time of travel from the southwestern arine permit boundary to the <br />town's neazest drinking water-supply well was performed using values for aquifer parameters of~f l~ <br />the Alamosa Formation within which the town's drinking water-supply wells are completed.'~T'he <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/SWAA for the <br />town's wells. Based on this approach, the estimated time of travel of 15 yeazs from the <br />southwestern extreme of the mine permit boundary to the nearest well exceeds the State policy <br />value for drinking water protection by a factor of 2. Therefore, this facility would riot fall within <br />the WHPA/S WAA based on the ground-water flow pathway alone under the State':. 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 />. 2 <br />4 <br />. <br />~ <br />cc. Juanita Bernal,SLWSD <br />Mike McGowan, CCCD <br />Jim Dillie, CDNR-DMG <br />Carol Russell, 8EPR-EP <br />Sincerely, <br />Rich Muza, Hydrologist <br />Ecosystems Protection Program <br />Office of Ecosystems Protection and R.emediation <br />O <br />