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SENT BY: GREYSTONE ENVIRONMENTAL; <br />January l Z, 2005 <br />3G3 889 G194; <br />JAN-12-05 12:28PM; <br />PAGE 2 <br />Environmental Caaultanrc, Ira.. <br />Mr. 1'om Kaldenbach <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />215 Centennial Building <br />1313 Sherman Street <br />Denver, CO 80203-2273 <br />RF.: Minor Revision 53 -Protected Channel Armoring <br />Chimney Rock Mine (Permit C-81-023) <br />Dear Mr. Kaldenbach: <br />RECEIVED <br />JAN 12 2005 <br />Division of Minerals 6 Geology <br />Kaiser Ventures, LLC hereby submits this Minor Revision that provides the design forthc protected <br />channels on the reclaimed areas of the Chimney Rock Miae. This plan provides the methodologies <br />and materials for the channels. The primary considerations will be to armor the channels while <br />minimizing disturbance to existing reclaimed vegetation. Map 8 of the permit identifies the location <br />of the 11, channels to be protected. Slope channels with.widths exceeding 1.0 feet will be armored <br />with,D50-1.0 font durable and angular rock. Rock will he placed with a small track leader and hand <br />tools. <br />Attached to this reyuest letter are the Minor Revision Application Form and Protected Channel <br />information that should be placed in Exhibit 7 of the .Permit Document. Rock armoring is sized <br />based onan assumed runoffarea for each channel of approximately one acre and a 10-year, 24hour <br />Slotm event of 2.25 inches. Maximum runoff (CN=86) is estimated at 1.1 cfs. Riprap sizing curves <br />fvr steep slopes (Figure 5.3, OSM/TR-82/2) are extrapolated to determine the D50 rock size of 1.U <br />foot. Rock is placed to line channel wtdths exceeding one foot. <br />Should'you have questions or need additional infomtativn wncerning this sampling plan, please do <br />not hesitate to contact NIt. Mike Keegan or let me know. <br />Sincerely, <br />-Jerry H: Koblitc <br />Principal <br />Attachments <br />cc Mike Keegan -Kaiser Eagle Mountain <br />5231 South Quebec Suer.l • Greenwood VillaKt. Colorado 8(111 I <br />u~....,. r:m. ucn nevi . v.,_ ran~~ voi nonu <br />