Laserfiche WebLink
EFCI contracted with Intermountain Environmental (IME) to evaluate and <br />compare the relative suitability of refuse and soil materials and based <br />upon the results, to review topsoil removal /replacement commitments and <br />refuse pile cover requirements. The results of IME's evaluation are <br />presented as Exhibit 9. Comparison of Refuse and Soil Suitabilities. <br />In order to evaluate coal refuse suitability. IME utilized all existing <br />available data on soils, overburden and refuse and completed additional <br />chemical and physical analyses on samples of fresh refuse, refuse three <br />(3), five (5), and seven (7) years old and samples from three (3) existing <br />refuse piles ranging between 24 and 52 years in age. <br />Using all available data, IME compared the suitability of refuse materials <br />with those soil materials which would normally be utilized under <br />applicable regulatory requirements to establish the minimum four (4) foot <br />cover depth of suitable material over stockpiled refuse materials. This <br />suitability comparison indicates that further testing to verify the <br />suitability of refuse materials may be justified. Refuse materials, based <br />is upon statistical comparisons, are superior with respect to rock fragments <br />less than three (3) inches in size, acid -base potential, NO3 - N, and Fe. <br />Soils are statistically superior with respect to SAR. Mean suitability <br />values for pH and other parameters are statistically comparable for refuse <br />and soils. Even though refuse SAR values are higher, available data <br />indicates that over a period of three (3) years, SAR levels will decline <br />to the point where they would be classified as "good" to "marginal" based <br />upon suitability guidelines for areas having similar climatic and <br />topographic characteristics published by the New Mexico Mining and <br />Minerals Division (NMMMD). <br />REV7R15.REV <br />11/15/93 1lam 4.06.2R Revised - November 1993 <br />