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iii iiiiuiiniii iii , • <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />I J 13 Sherman St. Room 215 <br />Denver, Colorado 80203 <br />Phone: 17031 856-3567 <br />FAQ(: f303) 8328106 <br />April 7, 2000 <br />DIVISION O F <br />MINERALS <br />GEOLOGY <br />RECLAMATION <br />MINING•SAFETY <br /> gJl Owens <br /> Governor <br />Pam Acre <br /> Greg E. Walther <br />Tuttle Applegate, IRC. Execmwe Direnor <br />11990 Grant Street <br />Suite 304 Michael g. Long <br />, Divisron Director <br />Denver, CO 80233 <br />RE :Tanabe Pit -Additional Adequacy Comments, 112 Permit Application <br />File No. M-2000-002 <br />Dear Pam: <br />Listed below are additional adequacy review comments on the above mentioned Regulaz 1 l2 <br />application. The additional comments are based on information received from Dorsey & <br />Whitney LLP (representing Pinnacle Pines, LLC) on April 3, 2000 and Ed LaRock of the <br />Colorado Hazardous Materials & Waste Management Division. Please note that information <br />received from Mr. LaRock was in resgonse to a Division inquiry regarding the status of <br />groundwater contamination at the Rocky Mountain Arsenal and surrounding area. I have <br />attached copies of the information from Dorsey & Whitney LLP and Mr. LaRock for your <br />review. <br />EXHIBIT G -WATER INFORMATION <br />19. Based on the hydrologic concerns for water quality raised by a number of objectors, there <br />appears to be a strong potential for either existing or future contamination of soils and <br />groundwater within the proposed affected area. Therefore, in accordance with Rule 6.4.7(b) <br />please identify all aquifers within the affected land down to the first aquitard and provide a <br />detailed characterization of such aquifer. Such characterization should include at a minimum the <br />following pazameters: <br />average high water depth to groundwater <br />direction and gradient of groundwater flow <br />aquifer transmissivity <br />hydraulic conductivity <br />expected drawdown rate, if significant, from other wells within 600 feet <br />proposed pumping rate needed to maintain dewatering trench & keep pit dry <br />expected drawdown rate of the groundwater surface at the pit during mining <br />expected cone of depression during mining & reclamation (until liner is completed &/or <br />dewatering is no longer needed) <br />