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APPENDIX 2.04.6-1 • OVERBURDEN APPRAISAL SUN COAL COMPANY - MEADOWS N0. 1 ROUTT COUNTY, COLORADO Cores were taken by Sun Coal Company, Inc., and transported to the Front Range Lab, Inc., where James R. Rogers randomly sampled each lithology, with the exception of major coal seams, for chemical and physical analyses. The samples were ground to pass a 2 mm sieve. Parameters determined were pH; electrical conductivity; percent saturation; water soluble cations (Ca, Mg, Na); Sodium Adsorption Ratio (SAR); nitrate- nitrogen; Olsen-Extractable phosphorus; available potassium; mechanical analyses (sand, silt, clay, and texture); and where the pH value was below 5, the acid- base potential was determined. If SAR values had been greater than 10, then exchangeable sodium percentage (ESP) would have been determined. Procedures • used were those described in the USDA Handbook 60 or proven by research at Colorado State University, amended only as necessary to utilize modern instru- mentation. The results for Drill Holes IC and 22C are given on Tables 2.04.6-1 and 2.04.6-2. Also, a drill log for lithologies sampled is given for each hole. Discussion of Results Each parameter determined is discussed separately below in respect to the rehabilitation of the mined area. ~. The pH is a measure of the hydrogen ion activity and is a useful indi- cator of the solubility of chemicals in the soil. It has a relationship to the nutrient status, salinity (or acidity), and trace elements of the soil. pH . values of pH 8.5 or greater may indicate a sodium problem (which will be indi- - 80 - (Rev. 5/86)