2005-01-03_REVISION - M1999120 (5)

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Wright Water Engineers, Inc.'" ~/~- K`Pl 2490 Wes[ 26th Ave_ Surte I OOA www.wngh[wa[er.mm7wwe/ Denvef, Colorado 8021 I January 3, 2005 ~ e-mail:krwrigh[Qwnghiwa[ef.[om ~303~ 980-1700 TEL t303~ 480-1020 FAX Via Hand Delivery Ms. Lynn Mayer Regulatory Specialist / L.G. Everist, Inc. ~/ 7321 East 88~' Avenue, Suite 200 Henderson, CO 80640 Re: Response to Comments Raised by DMG in Adequacy Review of Ft. Lupton Sand and Gravel Mine 112c Amendment Application (#M-1999-120) Dear Lynn: As requested, this letter responds to the comments raised by the Colorado Division of Minerals and Geology (DMG) on Exhibit G-"Water Information" for the above-referenced mine amendment application. Comments were received from DMG in a letter dated December 2, 2004. We assume that this letter and its attachments will be provided to DMG. Wright Water Engineers, Ina (WWE) has provided assistance to L.G. Everist, [nc. (LGE) on matters related to surface water, groundwater, and wetlands at the Ft. Lupton operation for the past several years. This work has included assistance with setting up a groundwater monitoring program, groundwater monitoring, slurry wall design, water rights, a wetland delineation, a wildlife assessment, and other matters related to water resources. We have provided similar assistance to other aggregate operators along the South Platte River northeast of Denver and elsewhere throughout Colorado. The following responds to the concerns raised by DMG on Exhibit G in the order presented in the December 2°d letter: #7 Requirement to minimize disturbances to the prevailing hydrologic balance and to the quantity and quality of surface and groundwater during and post-mining. The prevailing hydrologic balance of the proposed mine amendment azea and adjacent azea will be maintained during and following mining by maintaining existing surface and groundwater flow patterns, flow rates, and amounts. Surface Water Surface water features in the amendment azea, which aze disclosed in Exhibit G, include Little Dry Creek on the west side of the area, the South Platte River on the east side, the East Lateral of the Lupton Bottom Ditch which haverses the amendment azea, and a roadside ditch north of the azea along County Road 18. Little Dry Creek, the East Lateral, the South Plate River, and the roadside ditch will not be mined. All of these features will remain in their present condition. Buffer zones of varying widths will be utilized between mining GLEN WOOD SPRINGS DURANGO t970~ 945-7755 TEL ~970t 945-9210 FAX ~970~ 259-741 I TEL ~970~ 259-8758 FAX