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FROt•1 BRLRZ 8 RSSpCIRTES INC • FRX N0. : 97Q 263 ?736 BALAZ 8t; ASSOCIATES, INC. 1005 N. 12th February 21,2001 • Feb. ?III III'll'lllllllll 999 Grand Junction, CO 81501 Phone: Mr. Gregg Squire Division of Minerals and Geology 1313 Sherman Street, Room 215 Denver, CO 80203 Re: Matttm Creek Gravel Pit Roaring Fork Resources, lnc. File No. M-2000-113 Dear Gregg: Please lied enclosed the following response to Mt. Tom Schreiner's Final Hydrologic Adequacy Review Comments dated January 3, 2001. Item ] -Granular bedding and filter material source for various barrier configurations shovm on Exhibit CS ~. The granular bedding material is expected to be pit run materials that will be designed when size distribution information for the base material is available from one of the pits at the Mamm Creek site. The filter material will be si~~d using methods similar to those used to size filters around drain pipes. The filter material will range in thickness from 9" to t/x the riprap thickness. If no suitable filter material is available on site then a geotex[ile fabric will be used. The geotext>7e fabric, if used, will be installed per the: manufacturer's reeommenelatioa,. A copy of the design specifications for the bedding and fiher material will be submitted to DMCr for then review and approval prior to beginning construction As a point of clarification, not all of the barriers shown on sheet 2 are going to be used initially. At this time, it is projected that Details A (upstream end} and C (downstream end at weir} would be installed in the RRA. The tetnaining details have been submitted if river bank stabilization is needed or if the native material barrier (Option A) on the upstream end nerds improvement. Option B is an armored barrier that would be used to improve the Option A structure if needed. Since the materials in Detail A aze native materials left in place to create the upstream barrier, tto reclamation would be required. "fhe estimated amount ofmaterisl in [tte weir construction is 5,778 eu_ yd. of fill and 1733 cu_ yd. of riprap for bank armoring nn the main river side of the weir. The armoring is extended fifty (50)