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<br />bmc <br />WATER RESOURCE COHSULTANTs, LLC <br />Oct. 27, 2010 <br />? Dustin Czapla <br />(n Colorado Div. of Reclamation, Mining and Safety <br />101 S. 3'd Street, Room 301 <br />Grand Junction, CO 81501 <br />RE: Loesch Pit, M-1981-068, Garfield County, CO. <br />Technical Revision TR-003 - Pit wall liner <br />Operator: Grant Bros. Const. Ltd. <br />Dustin, <br />As discussed last Thursday Oct. 21, 2010, attached is a map showing the aerial extent of pit <br />walls at the Loesch Pit that have been reclaimed as of Oct. 2010 that also includes a liner. <br />The extent of reclamation shown on the enclosed Figure 1A shows the top and bottom of the <br />reclaimed slopes, not the actual limits of the liner. The limits of the liner (horizontally) are quite <br />a bit less. The length of pit wall that currently includes a liner is approximately 4,900 lineal <br />feet. The total length of pit wall will depend on the final configuration of the pit. The total <br />length of liner will depend on groundwater conditions as the pit is developed. If no inflow is <br />experienced, a liner will not be beneficial or needed. <br />Also as discussed, we agreed that future installations of the liner will not require keying the <br />liner in at the top, as was requested in the DRMS letter dated Oct. 7, 2010. This is because <br />the purpose of the liner is for groundwater control, e.g., to keep groundwater out of the pit, and <br />the stability of the liner is gained by placing backfill over the entirety of the liner, as opposed to <br />attempting to anchor the liner at the top via a keyway. Thus the plan is, when and where liner <br />in the future is installed, to install it in accordance with Figure 3 of our Oct. 4, 2010 letter <br />(attached for reference). <br />Should you have any questions, please do not hesitate to contact me. <br />Sincerely, <br />r <br />WATER RESOURCE CONSULTANTS, LLC <br /> <br />Paul C. Currier, P.E. <br />PCC/pcc <br />cc: Doug Grant, Grant Bros. Construction <br />/ 286-4.0 Reclaimed walls with liner.doc <br />244 Hutton Ave., Rifle, CO 81650 PH / Fax (970) 625-5433 pcurrier@wrc-Ilc.com