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STATE OF OLOP~"~~s0 <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman SL, Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 86G-35fi7 <br />FAX: 13031 832-8106 <br />~~ ~~ <br />s~~ <br />DEC 3 20Ci1 `~ <br />COL0INYC+ COkL (:C„ LP <br /> <br />DlV lSION OF <br />MINERALS <br />GEOLOGY <br />REC LAHATION <br />MINING•SAFETY <br />November 30, 2001 <br />Steve Hinkemeyer, P.E. <br />Colowyo Coal Company L.Y. <br />5731 State Highway 13 <br />Meeker, CO 81(141 <br />Attention: Ktmberley A. Wolf <br />Re: Special Topics <br />Dear Mrs. Wolf: <br />Oill Owens <br />Gnvrrmu <br />Grcry; E. VValchor <br />Executive Dirrclor <br />Michael fl. Loop <br />Division Diiectnr <br />During the Novemliei 27, 201 Coal Complete inspection by the Diirision of Mii-terals and . ' <br />Geology (Division), you asked fqr comments on two items. C7ne 3vas'i'able 1; page:? ofthe ... . <br />Per[nit Applie:atiori Package (Pft;P)' and the other of elevated Sodttim ~Adsciptio;i R'rfios (SAR;I,.. <br />frern 11!1`JOl satnplung of gverburden, .. ~. . <br />On November 27, 2001, we discussed a potential revision of'1'able 1, and how it becomes - <br />outdated yearly. A.s we discussed by telephone on November 30, 2001, Table 1 is in the ... <br />introduction section of the P.AP. Information in Table 1 is not required by the.Rules, and is <br />neazly duplicated in Table 3 on page 2.05-12 of the PAP. A portion of Table 3 is in fulfillment'of <br />a requirement of Rule 2.05.2(1). The format of Table 3 was modified under.Technical Revision <br />42 to reduce the frequency of update posting to coincide with 5-year permit terms. As such; " . <br />Table 1 could be'elirninated. <br />The discussion oa the significance of elevated SAR readings and required actions by Colowyo' <br />Coal Company, L.P. (Colowyo) was initiated from recent (11/12/01) analyses of overburden <br />samples (see Enclosure 1). Sampling of regraded overburden is accomplished at a density of one <br />sample per five acres of regraded area (PAP, Exhibit 6, Item # 4, Colowyo letter of January 4, <br />1983). During our telephone conversation of November 30 you confirmed that the samples in <br />question were taken of such regraded overburden. <br />Colowyo. recognizes the potential for elevated SAR values (PAP page 2.04.6-9). Threshold SAR <br />values. foc'special handling are icietitified as "suspect levels':. The SAR suspect level at Colowyo <br />is 15 ~Al?; :Exfubit ti, Item # 4, Colowyo letter of January 4; 1983). From the information at'~ ` <br />Enclosure 1, sample X-4 is of suspect materials (SAR value of ~24.3)._The SAR value of 9.19 of <br />sample Y-4 is also much higher than usual (below 2). ~ ' <br />eF N.o <br />