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3.1.2 IME Sampling Program (Sampling Program VI) <br />The sampling program conducted in 1988 by IME was completed to determine the suitability of <br />'~; overburden materials as a cover for the refuse pile. The subsequent report, completed in 1989, is on file <br />~+ with the Colorado Division of Minerals and Geology in association with the permit issued for this mine site. <br />~~ Twenty-four samples of overburden and bench materials were sampled and analyzed for a broad suite of <br />parameters. Table 3 depicts the ranges of analytical values for the samples collected . <br />`7. <br />~~ TABLE 3 <br />/~; SUMMARY OF LABORATORY ANALYSES-IME SAMPLING PROGRAM <br />(24 Samples, Excluding Parameters For Which No Suitability Criteria Exist) <br />Range of Range of <br />Parameter Values Parameter Values <br />(~!'?,A pH 5.6-7.8 B (ppm) -0.1-0.2 <br />'~`"~ Electrical conductive ) <br />ry (mmhos/cm 0.32-4.65 Cd (ppm) All -1.0 <br />~~r Percent organic matter 0.3-24.4 Cu (ppm) -1.0-6.0 <br />;y,~ Acid base potential (ABP) 1.4-47 Hg (ppm) All -0.01 <br />Texture Loamy sand-clay Mo (ppm) All -1.0 <br />.~~ Sodium adsorption ratio (SAR) 0.3-9.0 Pb (ppm) 0.2-2.4 <br />Saturation Percentage 28-68 Se (ppm) -0.01-0.06 <br />:~ NO3-N (ppm) 0.2-12.1 Zn (ppm) -1.0-16.0 <br />As (ppm) -0.01-0.29 <br />Values for all parameters listed above were found to tall into "suitable" ranges as per the guidelines <br />~ used to classify these materials (Schafer 1979, Sutton et al. 1981, Wyoming Department of Environmental <br />Y <br />Quality 1989) with the exception of percent organic matter and texture. Two samples had organic matter <br />~~^^,~~ percentages exceeding the recommended levels of 17.2 percent. These samples represented less than <br />i:?? 2 percent of the material sampled and it was postulated that dilution during grading would ameliorate this <br />h~ <br />condition. Two of the 24 samples collected exhibited clay textures which are considered to be unsuitable <br />according to the Wyoming guidelines used for this analysis (Wyoming Department of Environmental <br />~f Quality 1989 ). The textures of endemic soil materials, as shown by the results of sampling programs I <br />through V, are typified by clayey textures to a large degree. Based on this comparison, IME proposed that <br />'~3 the clayey textures of these samples not be considered a limitation to the use of this material as a cover <br />,' source. In addition, IME noted that the coarse fragment contents of the materials sampled was high, but <br />-~. that this was typical also of the soils in the area of the mine site. Given these data, it was proposed that this <br />I~j <br />7 <br />