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• ~ III IIIIIIIIIIIII III <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Deparlmenl of Natural Resources <br />1313 Sherman 51., Room ? 15 <br />Denver, Colorado 80?03 <br />Phone: (3(131 B66 3567 <br />FAX: U03) 83'-N106 <br />Date: January 29, 1996 <br />To: Janet Binns <br />From: Kent Gorham I /I v7 <br />CC: Dan Hernande2 <br />RE: 1995 Annual Hydrology Report, Bourg Mine, >¢'C-81-021 <br />~~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Goeernor <br />lames 5. Lochhead <br />E:ecwrve Dueaor <br />Michael B. Long <br />Diviwon Diretlar <br />I have completed review of the 1995 Annual Hydrology Report (AHR) <br />for the Bourg Mine. My questions and observations are as follows <br />below. <br />1. The currently approved plan requires that the operator <br />"examine the reclaimed area for springs and seeps." No <br />comments or text detailing the result of this examination were <br />included. The operator should include, in each year's AHR, <br />details about when this examination occurred, what areas were <br />examined, and the results of this examination for springs and <br />seeps. <br />2. The currently approved sampling plan requires that SAR be <br />calculated and reported. No SAR values were reported for the <br />three lab samples analyzed during 1995. <br />3. Well 30-C has a reported iron value of 8.08 mg/1, total <br />recoverable. It is likely that the well casing is the cause <br />of this relatively high value. Furthermore, although the plan <br />is not specific, the Division is more interested in the amount <br />of dissolved iron with regard to ground water. <br />4. September 1995 water levels in well 30-C have risen some 2.5 <br />feet since the fall of 1994. Some fluctuation due to <br />variations in precipitation is expected. However, water <br />levels in well 33-B show a more curious variation. Well 33B <br />has been observed as dry in all previous reports since at <br />least 1991. Spring 1995 water levels indicate a column of <br />water at least 10 feet above the bottom of the well, possibly <br />due to heavy spring precipitation. This well should be <br />observed this field season to determine if further <br />investigation of this anomaly is warranted. <br />With the exception of the iron value, reported values are very near <br />the previously defined range of values and no discernable impact <br />due to mining can be identified at the present time. If you have <br />questions, let me know. <br />