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4/2/2015 State.co.us Executive Branch Mail - Fwd: 4.05.1 Hydrologic Balance General Requirements and Staff Review of AHR <br />experiencing ever increasing inflow rate in the 2 North mining section. In fact the <br />areas inflow has increased 70% from 1993, up from 25.8 ACFT to 43.6 ACFT. Of <br />the 18,327,000 total gallons of inflow recorded for the year, 14,194,720 gallons <br />are from the North Dewatering Well located in the North Main section ". <br />Precipitation patterns from 1992 to 1994 do not show any correlation to the mine <br />flow. <br />B. Last year's report included inflow data from the West main section together <br />with the North main sections. since retreat mining has occurred in the West main <br />section of the mine, inflow recordings are no longer available for this section. <br />January 22, 1996 Continuing dewatering from N 1,N2 pumped into the N Mains. <br />Retreat mining and sealing operations sometimes eliminate the opportunity to <br />monitor inflows semi - annually. <br />Mike Boulay in 1997 AHR review states "It appears that relatively precise <br />measurements are provided for mine inflows in ACFT. The text states the mine <br />inflows were estimated. PLEASE discuss the Methodology as to were table of <br />well completion dated including total depth, screened intervals, formation. etc. for <br />easy reference in the future AHR. <br />In an internal memo from Jim Burnell to Jim Start cc: Sandy Brown <br />The most recent data on mine water inflows (reported on page 5 of the 2002 <br />AHR) show inflows much lower than were predicted in the permit application. <br />PREDICTED INFLOWS WERE 330 ACRE FEET PER YEAR AND THE MOST <br />RECENT AVAILABLE DATA SHOW INFLOW ONLY 5.2 ACRE FEET PER <br />YEAR. INTERPRETING THIS IS NOT AN EXACT SCIENCE, BUT IT APPEARS <br />THAT THE ORIGIANL PERMIT OVERESTIMATED THE AMOUNT OF <br />GROUNDWATER PRESENT. EFCI's water consultants Bishop, Brogen have <br />scenarios stating it may take 120 -150 years to recover. <br />In a June 6, 2007 review Kent Olsen stated "Mine flooding will eventually6 restore <br />in recovering groundwater. <br />In July 1,2008 review Kent states Water in MWNW needs to be monitored until <br />water perched from aquifers result in the mine flooding. <br />MW 23 the only monitoring well being tested on our property is now 3 feet above <br />the Red Arrow Seam and is less deep than originally being monitored. <br />Conclusions ?? <br />Michael P. Boulay, P.G. <br />i1w <br />�� .. , <br />COLOIRADO <br />Division of Rectal natli,n:vn, <br />A&17 Mining and, Safety <br />Denrartrnerrtc,;+ PalaturralFtt.sruwe:es <br />https:Hm ai I .googl e.com /m ai I /u/0 / ?ui= 2 &i k= e29129fcb5 &view = pt &search= i nbox &th= 14c7abOe8c4O8f38 &si m l= 14c7abOe8c4O8f38 4/5 <br />