Laserfiche WebLink
2.04.9 Soils Resource Information <br />Four SCS soil mapping units occur within the permit area (Map 4-5). They are in <br />order of importance to soil salvage: I) the R8-CD Falfa clay loam, 3 to 8 percent <br />slopes, 2) the XE6-E Zyme-Rock outcrop complex, 12 to 65 percent slopes, 3) the <br />XTO-E Ustic Torriorthents-Ustollic Haplargids, 12 to 60 percent slopes, and 4) the <br />RL-Rock outcrop containing little soil. SCS soil descriptions are contained in <br />Appendix 4-5. Typical soil horizon depths for the permit area soils from pedon <br />descriptions are: <br />SCS Map Unit Soil Series Horizon Depths (inches) <br /> A B C <br />R8-CD Falfa clay loam 4 76 80 <br />XE6-E Zyme-Rock Outcrop <br /> Complex 6 0 0-14 <br /> (clay) <br />XTO-E Ustic Torriorthents 6-8" total <br /> Ustollic Haplargids <br />RL Rock Outcrop 3" total <br />Samples of each of the four soils were selected for analyses. The samples were <br />• collected with a shovel, placed in plastic bags and transported to CDS Labs in Durango <br />(See Map 4-5 for sample locations). Samples 12 and 13 were obtained with use of a <br />drill rig. Results of the analyses are contained in Appendix 4-5. The analyses indicate <br />that all soils sampled apparently possess characteristics suitable for stockpiling and <br />eventual redistribution with appropriate soil amendments. The clay percentage of these <br />soils is greater than desired. Additionally, the soils are uniformly deficient in <br />phosphorous and nitrogen. These problems will be overcome with mulch (to improve <br />soil structure) and fertilizer applications. The fertilizer application rate will be <br />determined from soil tests of redistributed soil during reclamation. <br />Soil material suitability for salvage and reclamation is shown on Table 4-7. Falfa clay <br />loam could be stripped to six feet based upon sample analyses 1, 5, ]0, 11, 12 and 13. <br />The Zyme-Rock outcrop complex could be stripped to 6 inches where possible based on <br />Samples 2 and 6. Salvaging any deeper in this soil will contaminate the thin A horizon <br />with clay and shale. The exception to this recommendation is considerable deposition <br />of this soil that has occurred in the Carbon Junction Canyon bottom for a width of 57 <br />feet. In this area, soil should be salvaged to a depth of 24 inches (Samples 4, 7, 8 and <br />9). Analysis of the Ustic Torriorthent -Ustollic Haplargids Series indicate 6 inches <br />should be salvaged (Sample 14). However, this soil occurs sporadically in pockets of <br />sandstone and is sandy, gravelly and cobbly. In addition, the Rock outcrop soil, 3 <br />inches total depth, cannot be practically salvaged with existing heavy equipment. <br />Therefore, soil stripping in the Ustic Torriorthents -Ustollic Haplargids and Rock <br />• outcrop soil mapping units is not recommended, as any soil retrieved will most likely <br />Technical Revision 09 (v 1.0) 415 Revised 3/1998 <br />