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~ III IIIIIIIIIIIII III r STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1313 Sherman Si., Room 215 Denver. Colorada BO203 Phone: (303) 86E~~3567 FAX: 1303) 832-d 106 Novemt~er 29, 2000 DIVISION OF MINERALS GEOLOGY RECLAMATION MININ G•SAFETY Mr. Michael C. Refer Bill Owens covemor CAMA:~ Colorado, Inc. ores E. w,l~ner 3605 S. Teller Street Executive Director Lakewood, CO 8235 Mn hael B. Long Div~sian Dkecror RE: Longmont Distel Operations, AM-3, Adequacy Letter, Permit No. M-89-029 Dear Mr. Refer: Listed below are adequacy review comments on the above-captioned amendment application for an additional 239.4 permitted acres. The decision date for your amendment application is scheduled far December 20, 2000. Therefore, I would appreciate a response from you on or before December 20, 2000. The Division will make a decision on your application as there were no adverse comments received during the public: comment period. However, we have attached comments received earlier this year from adjacent landowners regarding the current operation. Please be advised that your amendment application may be deemed inadequate and may be denied on December 20, 2000 unless the following adequacy review items are addressed to the satisfaction of the Division. Additional time may be granted, upon your request, to submit an adequacy response provided you contact the Division on or before December 20, 2000. 6.4.7 EXHIBIT G -Water Information 1. The applicant indicates on page 27 that further hydrologic analysis is needed to evaluate groundwater Flows and finalize sizing of control structures. (Hydraulic structures will be sized to pass surface runoff from the :!5-year storm event plus the groundwater base flow). Please indicate what the further hydrologic analysis will consist of, when the analysis will be completed, and how such information will be used to finalize sizing of such structures. If such information is not currently available, the applicant may elect to submit final "as built" designs along with the further hydrologic analysis when it becomes available. Such information may be incorporated into the mining & reclamation plan via technical revision. Please respond. 2. The apllicant states on page 28 that the potential exists for impacting the shallow groundwater level in the immediate vicinity of the excavation and on page 30 that the alluvial groundwater table will be drawn down approximately 15 feet, to the bottom of the sand and gravel deposit. The applicant states on page 31 that the in-,pact to the local groundwater level is expected to be limited to distance of one-quarter mile (1,320') fr~~m the mining operations. Please quantify the vertical extent of drawdown expected within the 1,320' radius and to what extent any existing groundwater wells, pond, or lake water levels may be affected. ]fan impact is projected, please provide an estimate of the extent of the impact, the length of time of the impact, and any mitigation measures that may be employed.