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State Reg. <br />• TAB 9 <br />ATTACHMENT 9-2 <br />SOIL SURVEY ADDITION - 4-40'S AREA <br />I. SURVEY HISTORY <br />Seneca Coals, Ltd. will disturb approximately 125 acres of native soils in the <br />4-40's area during 1981 through 1992. The disturbance schedule for the 4- <br />40's area is included as part of the Operations Plan (Exhibit 12-I). <br />Soils on the 4-40's property were previously surveyed by Texas Instruments, <br />Inc. in 1978 and by the U.S.D.A. Soil Conservation Service (S.C.S) in 1977 <br />and 1979. Numerous shallow pits (6-36 inches deep) were dug by Seneca <br />Coals, Ltd. in 1980 to assess the accuracy of the above mentioned surveys. <br />This latter reconnaissance aided map joinup techniques with the surrounding <br />• survey conducted by Claude Fly and Associates and also helped to predict <br />the quality and quantity of topsoil to be removed from this area. <br />II. DESCRIPTION OF THE AREA <br />The 41+0's Soil Survey Addition is located approximately 2.3 miles southeast <br />of the Seneca Mine Office in the Nf4 Nfi of Section I, Township 5 North, <br />Ronge 87 West in Routt County, Colorado. The field survey map boundary <br />joins soil mapping completed by Claude Fly and Associates, 1979. This <br />survey area is delineated on the Soil Type and Topsoil Salvage Isopach Maps <br />contained in Tab 9, Exhibits 9-I and 9-2. <br />111. SOIL FORMING FACTORS <br />Natural soils form under the influence of five soil-forming factors: parent <br />materials, organisms, climate, relief, and time. Differentiation of natural <br />soils into different taxonomic groupings therefore result from differences in <br />• one or more soil-forming factors. In this survey area, it appears that parent <br />material, vegetation, climate, relief, and soil age all vary gradually over the <br />landscape. <br />9-10 <br />