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-iii iiiiiiiiiiiuiii <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman 51 . Room 215 <br />Denver, Colorado 80203 <br />Phone: 13031 866-3567 <br />FAX: 0031 832 8106 <br />To: Susan Burgmaier <br />From: Barbara Pavlik <br />Date: Auquat 18, 1995 <br />Re: Midterm Review - Seneca IIW Mine (C-82-057) <br />~~~~~ <br />DEPARTMEN"I' OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Governor <br />lames 5. Lochhea8 <br />E.ecwive Director <br />M1t¢hael tl. Lonti <br />D rvisiun Dueaor <br />I have reviewed the groundwater portion of the above referenced <br />permit and have the following comment: <br />Tab 18, page 5a, 3rd paragraph states, "Water level <br />fluctuations as a result of irrigation, natural and water <br />quality sampling stresses have been reasonably defined. <br />Significant water level drops outside these multiple year <br />ranges will be considered to be possible effects from pit <br />pumpage. Water level drops in monitoring wells outside <br />the projected zones of pit pumpage will not be considered <br />suspect unless a consistent deepening trend develops." <br />The operator should be cautioned against throwing out <br />data simply because a trend occurs that was not <br />projected. Such a trend could indicate that other <br />factors not considered in the original prediction could <br />be involved. Without substantial reason for suspecting <br />data, the data should be considered to be a true <br />indicator of what is happening with groundwater levels. <br />If there is doubt, additional well(s) should be installed <br />to verify or discount the data retrieved from the <br />"suspect" well. This should be acknowledged in the <br />permit. <br />If you or the operator have any questions, give me a holler. <br />Cc', Lqr..~ hoo~en <br />