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APPENDIX 6-5 (Cont.) <br /> Table 6-5-2 (Cont.) <br /> Marginally Suitable to Unsuitable Quality Zones <br /> in Overburden, Interburden, and Underburden Material, <br /> Nucla East Study Area, Montrose County, Colorado <br /> Footnotes <br /> 1The following abbreviations apply to sample type: SH - shale, SS - sandstone, SNDY - <br /> sandy, SLTY - silty, SHLY - shaley, CL - clay, CARB - carbonaceous, and CO - coal . <br /> 2 <br /> Geologic strata includes: OBV - overburden (material above upper Dakota coal seam), INB <br /> - interburden (material between upper Dakota and lower Dakota coal seams), UNB - <br /> underburden (material below lower Dakota coal seam), and C - coal. Lithologic Units 1 <br /> through 6 are described in Attachment 6-1, Overburden-Interburden-Underburden <br /> Characteristics section. <br /> 3The percentage of marginally suitable to unsuitable strata is combined for the overburden <br /> and interburden sections. No percentage figures are included for the underburden since <br /> an incomplete section was sampled. <br /> 4Mitigative measures include: AV - avoidance, M - mixing, and SH - selective handling. <br /> 5The following abbreviations apply to texture: S - sand, and C - clay. <br /> 6-5-6 Revised 04/11/88 <br />