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Tests of the tunnel area ( 1979) indicated that the <br /> SAR of all materials is quite low, indicating very low <br /> sodium hazards . <br /> Particle Size Analysis : All of the samples taken <br /> in the permit area indicate, with two exceptions , sandy loam <br /> soil . The sandy loam contains coarse sandstone fragments <br /> which are variable in size . <br /> The exceptions are sample No . 9 (Dutch Creek <br /> No . 2) and Sample No . 10 (Dutch Creek No . 1) , which indicate <br /> sandy clay soil . <br /> For percentages of sand (coarse) , silt (fine) and <br /> clay (very fine) from each of the soil samples see Table <br /> III-G-6 . <br /> Overall , the soils support relatively great amounts <br /> of vegetation, indicating good quality soils . If disturbed , <br /> revegetation should be able to proceed with a minimum of <br /> effort and fertility amendments , provided that the Mancos <br /> shale portions of the profiles are not incorporated to any <br /> great degree into the overlying soils . <br /> Iron, manganese: DTPA-extractable iron and <br /> manganese levels range from medium to high. These high <br /> levels are probably due to the nature of the coal material <br /> found in abundance in many of the disturbed areas . <br /> Samples of the tunnel area (1979) indicated that <br /> iron content of the soils is sufficient to support vegeta- <br /> tive growth, except that the Mancos Shale samples showed low <br /> concentrations . <br /> -12- <br />