2014-03-18_REVISION - C1981014 - Laserfiche WebLink

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energy fuels coal, inc. aouthfleld mir l post gffjce bRX 459 • florence, colorado 81226 • (719) 7846395 1Vlar Il 14 111 l Mr. David Berry - Director Division of Reclamation Mining & Safety MAR '� 8 2014 1313 Sherman Ave — Room 215 PION Denver, CO 80203 DMM�N O gyp Sgt RE: Monitor Well MW -NW - Related Elevations Energy Fuels Coal, Inc., (EFCI), Southfield Mine — Permit No. C -81 -014 Dear David Berry: This is in response to questions that arose during the recent meeting with Rich Munson and you on March 11, 2014 concerning the monitoring well, MW -NW located at the Southfield mine. This is to confirm that there was no diagram for MW -NW generated or submitted with Technical Revision No.35 (TR -35) which approved the conversion of,the north well to be used as a groundwater monitoring well in 2003. However, I submitted a sketch dated June 2012, titled "Cross Sectional View of 1St North, 2 "d North and West Submains ", to Janet at approximately that time. Pursuant to the above meeting, (3- 11 -14) I have updated that sketch (copy enclosed) to include the measurement recorded by the DRMS' remote down hole camera which is 353 ft from the top of the well casing to partial obstruction. That distance calculates to 5879.7 ft elevation of the partial obstruction in the well. Elevations of the mine workings are from the Southfield Mine Permanent Closure Map and from respective drill hole log data. The map establishes the elevation of the `roof' of the mine workings at MW -NW at 5860.5. The cross - sectional view of the sketch also depicts the relative elevations of the mine workings elevations as related to MW -NW. It simplifies the understanding of the depth of the mine workings (lowest point, 5265 ft elevation) as compared to the elevation of the partial obstruction in the well (5879.7 ft) which is a difference of over 614 vertical ft. One can understand why geohydrologic consultants predict that for the mine to refill or reach equilibrium, would take 200 — 300 years. The DRMS camera confirmed that the well casing is 8 inch diameter steel casing for 17 ft where it then reduces to 6 inch diameter steel casing and is clear down to the elevation of the partial obstruction. Concerning the depth of the well, I have enclosed a copy from the Southfield Exhibit 25, Hydrologic Monitoring Plan (page 4 in highlights) which states the depth of the well installed was 380 ft with a completion zone of 360 — 380 ft. I hope this helps clarify some of the questions about MW -NW, if you have any further questions or need additional information please contact me. Sincerely, t�. t eorge Patterson Energy Fuels Coal, Inc. Enclosures: Mine Sketch & Page 4 of Exhibit 25