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Table 4. Amount and Suitability of Topsoil Materials for the Proposed Nucla Mine <br /> Expansion Area, Montrose County, Colorado, 1979.17 <br /> Mapping Caiposition Horizon Coiposiion Topsoil General Soil Consis- Fxosion Rating Limiting <br /> Unit of Area Avg. of Unit volume Texture Permeability tense Structure Factors for Factors Comments <br /> Acres 8 Depth Percent (acre Class Class K I Topsoil <br /> (inches) feet) <br /> 5810 66.1 56.98 AO-6 100 33.05 SCL Mod SH/VF wk gr .30 5 G thickness Shale depths <br /> 702 B6-12 100 33.05 SCL/SL Mod MII/VF msbk .35 5 F/G depth range from 18" <br /> C12-24 100 66.10 SCI,/SL Mod MH/FY msbk .24 5 F/P consistence to 36" under <br /> 5810 10.85 9.35 AO-6 100 5.42 SCL Mod SH/VF g .30 5 G thickness the Shavano <br /> 3B1 B6-12 100 5.42 SCL/SL Mod SH/Fr msbk . .20 5 G thickness soils. <br /> C12-24 100 10.85 SC7/SL Mod MI/Fr msbk .25 5 F/P consistence, <br /> depth <br /> 5810I 2.79 2.41 AO-12 100 2.79 SL/SCI. Mod SH/VF gr/wksbk .25 5 G/F thickness (Intermi.ttently <br /> 3B2 BC12-24 100 2.79 SCL Mod MH/Fr wksbk .25 5 F consistence wet) <br /> 5810I 1.75 1.51 ABO-12 100 1.75 SCL/SL Mod SH/FY gr/sbk .25 5 G/F depth Iintermi.ttently <br /> 7C1 C12-24 100 1.75 SCL Mod MH/Fr sbk .25 5 F consistence wet) <br /> 5810E 4.09 3.53 ABO-4 100 1.36 SCL Mod MH/Fr f.gr. .30 5 F consistence Steep, eroded <br /> D-2 BC4-18 100 4.77 SCL Mod If/Fr wksbk .30 5 P/F slope/depth <br /> shale <br /> 9904 10.55 9.09 AO-4 100 3.52 SCL Mod H/17'r s.gr. .30 5 F/P slope/thick- Several short <br /> D-1,2 C4-12 100 7.03 SCL Plod VII/fi cbl/m .30 5 P ness steep ridges <br /> stones/ and thin <br /> shale soils over <br /> consistence shale and sand- <br /> stone <br /> Usable 96.13 82.87 12-24 total = 179.65 <br /> Non- <br /> Usable 19.87 17.132/ Good to fair 87.38 <br /> 1/ See Appendix C Glossary of terms and key to abbreviations <br /> 2/ Stock-piles = 4.47 acres. See Quality data of stockpiles in Table 6. <br /> N <br /> r <br />