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M -1985 -112 - Loloff Construction, Inc. - Loloff Pit - Technical Revision Request No. 1 <br />July 3, 2013 <br />-4- <br />The following figure is a graphical representation of the estimated cone of depression /radius of <br />influence that results from the dewatering activities: <br />EXISTING <br />GROUNDWATER <br />LEVEL <br />CONE OF DEPRESSION <br />WITH NO RECHARGE <br />1,024' <br />566' — j <br />RECHARGE Olo <br />DITCH /POND t=I? <br />J'� <br />CONE OF DEPRESSION <br />WITH RECHARGE <br />T 43' <br />37' MINING <br />WATER DEPTH <br />DEPTH i <br />Reclamation Plan: Revision of the Reclamation Plan to change the reclaimed slope to a 3H:1 V <br />slope. <br />The reclaimed slope will be changed to a 3H:1V slope to match the mining slope. Please refer to the <br />attached revised reclamation plan for the proposed revision. <br />Loloff Construction, Inc. appreciates your consideration of this technical revision request and looks <br />forward to your response. <br />Please feel free to contact me with any questions or comments. <br />Sincerely, <br />J.C. York, P.E. <br />J &T Consulting,, Inc. <br />Attachments: <br />$216 Check for Technical Revision review fee <br />Slope Stability Report - Loloff Pit <br />Loloff Pit Site Map monitoring well location map <br />Excerpts from "Groundwater and Wells - Second Edition" by Fletcher G. Driscoll <br />Cone of depression /radius of influence calculations and pumping rates <br />Exhibit F - Reclamation Plan Map <br />Cc: Loloff Construction, Inc. <br />File <br />4r, 305 Denver Avenue - Suite D • Fort Lupton CO 80621 • Ph: 303 - 857 -6222 • Fax: 303 - 857 -6224 <br />