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because it is part of both the Seneca II Mine and Foidel Creek Mine soil legends. The <br />Impass name is used for non - affected areas. Binco is an established soil series of <br />small extent mapped in the mountainous areas of north - central Colorado, and is <br />classified as a "Fine, smectitic frigid Chromic Udic Haplustert". Diagnostic features for <br />the typical pedon include a "Bss" horizon ( "B" horizon with slickensides) from 4 to 23 <br />inches in depth. The most recent official NRCS soil series description for Binco, dated <br />March 1999, is on file. Impass is essentially the same soil as Binco except it is <br />considered to have an "ustic" soil moisture regime with 18 to 26 inches of average <br />annual precipitation rather than about 12 inches for Binco. Impass is classified as a <br />"Fine, smectitic Chromic Haplocryert". <br />Binco Typical Sample "CC -1" Site and Profile Description: Binco clay was fully <br />described and sampled at one representative site, CC -1, located in a portion of the <br />SW1 /4 of the SW1 /4 of Section 13, T.5N., R.87W. The sample site is on an upland ridge <br />sideslope with big sagebrush and mixed grasses vegetation, and is within the previous <br />potential transportation corridor in the hilly ridge "gap" area between the south end of <br />the Seneca II Mine permit area and the north end of Foidel Creek Mine permit area. <br />Sample site CC -1 has 12% slope, south aspect, slopewash alluvium over residuum <br />from clay shale; and stable surface with no erosion in the vicinity of the sample site <br />location. An evaluation of soil suitability indicates the sampled Binco pedon CC -1 is <br />consistent with the previous Seneca II Mine recommended topsoil salvage depth of 6 to <br />8 inches, with an average recommended depth of 7 inches. Clay content is too high <br />is ( > 40 %) below 7 inches for salvage. <br />A horizon — 0 to 4 inches; brown (10YR 5/3) loam, dark brown (10YR 4/3) moist; moderate <br />medium granular structure; slightly hard, friable, sticky and slightly plastic consistence; <br />common medium, fine, and very fine, and few coarse roots; slightly effervescent; from lab <br />data: pH =6.1 (slightly acid), EC =0.4 (nonsaline), SAR =0.4 (nonsodic), OM =13.7% by <br />weight -loss on ignition; gradual smooth boundary. <br />Bss horizon — 4 to 15 inches; brown (10YR 4/3) clay (45% clay), dark yellowish brown <br />(10YR 4/4) moist; moderate medium subangular blocky structure; hard, firm, sticky and <br />plastic consistence; common to few medium, fine, and very fine, and few coarse roots; <br />slightly effervescent; from lab data: pH =6.0 (moderately acid), EC =0.1 (nonsaline), <br />SAR =0.6 (nonsodic), OM =1.4 %; gradual wavy boundary. <br />BC horizon — 15 to 26 inches; yellowish brown (10YR 5/4) clay (46% clay), dark yellowish <br />brown (10YR 4/4) moist; massive structure; very hard, very firm, sticky and plastic <br />consistence; slightly effervescent; from lab data: pH =6.2 (slightly acid), EC =0.3 (nonsaline), <br />SAR =1.7 (nonsodic); OM =0.6 %, gradual wavy boundary. <br />C horizon — 26 to 38 inches; yellowish brown (10YR 5/4) clay (45% clay), dark yellowish <br />brown (10YR 4/4) moist; massive structure; very hard, very firm, sticky and plastic <br />consistence; slightly effervescent; from lab data: pH =6.9 (neutral), EC =0.2 (nonsaline), <br />0 9 <br />