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Nitrate - Nitrogen <br />• <br />~ The range of values for nitrate-nitrogen are from 1 to <br />3 ppm with the weighted mean for both holes being less than 2 ppm. <br />These concentrations are extremely low and will not cause any <br />potential toxicity problems. <br />In summary, the chemical analyses of the overburden samples <br />demonstrate that there are really no potential toxicity problems <br />associated with any of the parameters tested except sodium. The <br />sodium absorption ratios are extremely high near the nose of the <br />anticline and tend to decrease rapidly northward up both flanks. <br />Because the sodium seems to be fairy! evenly distributed throughout <br />the stratigraphic section (especially near the vicinity of hole <br />LM1B-4), special handling of the overburden in general will not be <br />necessary as the random mixing of spoil in the backfill areas will <br />lower the overall sodium concentrations which are presently so high. <br />This will be especially true for the groundwater bearing zones <br />• immediately above the coal which presently are among the strata <br />exhibiting some of the highest S.A.R, values in the section. <br />Due to the high sodium concentrations in the overburden, Wyoming <br />Fuel Company does not intend to utilize any of the overburden as <br />a substitute for topsoil. <br />HYDROLOGY OF PIT 1 - FEDERAL COAL LEASE No. 27931 <br />Information necessary to address section 2.04.7 for the Pit <br />1 area was collected, interpreted and presented by the following <br />organization under contract by Wyoming Fuel Company: <br />Mr. Scott Medford, Project Geologist <br />Willard Owens Associates, Inc. <br />P. 0. Box 886 <br />wheat Ridge, Colorado 80033 <br />• <br />- 43- <br />