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<br />3anuary 12, 2005 <br />Mr. Tom Kaldenbach ~~~ <br />Environmental Protection Specialist ~~~ <br />Colorado Division of Minerals and Geology <br />215 Ci;mennial Building S <br />1313 Sherman Street <br />Denver, CO 80203-2273 <br />RF.: ' Minor Revision 53 -Protected Chancel Armoring <br />Chimney Rock Mine (Permit C-$1-023) <br />Dear Mr. Kaldenbach: <br />RECEIVED <br />JAN 12 2005 <br />Division of Minerals & Geoklgy <br />Kaiser Ventures, LLC hereby submits this Mirror Revision that provides the design for the protected <br />channels on the reclaimed areas of the Chimney Rack Mine. This plan provides the methvdolosies <br />and materials fors the channels. 7'he primary considerations will be to armor the channels while <br />minimizing disturbance to existinb reclaimed vegetation. Map 8 of the permit identifies the location <br />of the 1 ~ channels to he protected, Slope channels with.widths exceeding 1.0 feet will be armored <br />with,I~50-1:0 foot dumable and angular rock. Rock will he placed with a small track loader and hand <br />tools. <br />Attached to this request letter are the Minor Revision Application Form and 1'roteeted Channel <br />Information that should be placed in Exhibit 7 of the Permit Document. Rock armoring is sized <br />based on;an assumed runoff area for each channel of approximately one acre and a 10-year, 24hour <br />storm event of 2.25 inches. Maximum runoff (CN=86) is estimated at 1.1 cfs. Riprap sizing curves <br />for. steep slopes (Figure 53, OSM/'I12-82J2) are extrapolated to determine the D50 rock size of 1.U <br />foot. Rock is placed io line channel widths exceeding one foot, <br />Shotild'you have questions or need additional information concerning this sampling plan, please do <br />not hesitate to contact Mt. Mike Keegan or let me know. <br />Sincerely, pJ <br />~tJ~n~ ~ l'~- <br />V '` <br />Jerry li: Kobliiz <br />Principal <br />Attachments <br />cc Mike Keegan -KaiserEal;le Mountain <br />52:31 South Quebec Street • Greenwood Vi11aKe, Color3du SOl 1 I <br />uti•.... r~iM~ ucn Haan. u... rvnz~ aoi a~au <br />Environmental Consultants, lru•. <br />