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K. Holder Page 2 of 2 <br />September 24, 2002 <br />FMM has also indicated that the northwestern portion of Subarea 3 will be used for temporarily stockpiling mined <br />gravel before it is hauled off site (Figure 1). This area is upgradient of the area to be mined and dewatered. <br />Therefore, any runoff or infiltration draining from the gravel should ultimately be captured by the dewatering <br />system and pumped to the sedimentation pond, the outfall of which is subject to the Dischazge Permit effluent <br />limitations. <br />Two additional monitoring wells must be installed prior to start of mining to determine the lateral extent of free <br />product in MW-2 and to act as "sentinel" wells for potential movement of product during dewatering. The <br />locations of these proposed wells, MW-4 and MW-5, aze shown on the attached Figure 2. These wells must be <br />screened across the water table as determined during drilling (screened interval from approximately 5 to 20 feet). <br />Well MW-5 must he added to ~eetion 3,2 of the WMCP and to the.Site Inspection form_contained.ln Appyndix B_ <br />(well MW-4 has already been incorporated into the plan). Please submit replacement pages for insertion into the <br />WMCP that incorporate these changes. <br />As a general reminder, all monitoring wells at the site not directly in the area to be excavated for mining, <br />must be preserved and protected during mining and construction activities to ensure that they are not <br />covered, damaged, or destroyed. This is especially true for wells GWC-1 (must not be destroyed during <br />construction of sedimentation pond), wells MW-4 and MW-5 once installed, and WP-3 and MW-2. Wells MW-1 <br />and MW-3 should also be preserved until those areas are mined, to the extent possible. <br />Please contact me at (303) 692-3362 if you have any questions or require any additional information <br />Sincerely, <br />Teresa J. Bennett <br />Hazardous Waste Corrective Action Unit <br />Compliance Program <br />Attachments <br />cc: David Kreutzer -Colorado AGO <br />Elizabeth Rowan -Mesa County Administration <br />Bennett Boeschenstein -City of Fruita <br />Bill Rothenmeyer - USEPA <br />Matt Sura -Western Colorado Congress <br />M. Jensen/T. Logue -Elam Construction <br />Chris Gates - WQCD <br />