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~~ <br />Richertl D. Lamm <br />Governor <br />III IIIIIIIIIIIIIIII <br />999 <br />DEPARTMENT OF NATURAL RESOURCES <br />David N. Getchea Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SNELTON, Dlrsctor <br />r / <br />May 22, 1985 <br />Mr. Jim Hendricks <br />General Superintendent <br />Pueblo Coal, Inc. <br />278 Sawyer Drive, Ste. 1-A <br />Durango, CO 81301 <br />RE: Ground Water Monitoring Program at Carbon Junction Mine <br />to Predict Possible Pit Inflows; Suggestions for Modifying <br />Dear Mr. Hendricks: <br />This letter is meant to summarize our meeting on 1 May, 1985 at the Carbon <br />Junction Mine. <br />As we both agreed, it is anticipated that mining operations will intercept <br />substantially more water than was originally thought. <br />In order to alleviate potential handling problems, and to ensure that mining <br />will not be significantly delayed due to unforeseen dewatering problems, <br />rates and amounts of mine inflow should be recalculated. Once inflow rates <br />are determined, a plan to deal with the water may be developed. <br />I suggest that since drilling and coring operations are now in progress, you <br />modify the program presented in the Kaufman and Vandell paper ("Integrating <br />a Ground Water Data Reconnaissance Program into a Mineral Exploration <br />Program") to fit your conditions. <br />The most important aspects of the program, which are easily done at your <br />site, are: (1) using the sample form (or a variation of) which I gave you, <br />have the driller note where he first encountered water; (2) measure air lift <br />production from the hole (with bucket and stop watch) as drilling continues; <br />(3) develop the hole with compressed air; (4) measure depth to water when <br />water level stabilizes; (5) note water level on any geophysical logs. <br />Careful notation of date and time when measurements are made is vital. <br />Also, ground level at each hole should be surveyed in. This data could be <br />collected at each hole in a minimal amount of time. <br />Once you have collected the data, and plotted hole locations on your base <br />map, a copy should be sent to your consultant and one to the Division. The <br />data sent should include production, depth to water, drillers' notes, <br />geophysical logs, ground level elevations, and the hole locations plotted on <br />a base map. <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />