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• (greeter then 70 feet) overburden strata. Magnesium also becomes the more dominant cation es the overburden thickness increases. Potassium values ere about 50 percent higher in the Volf Creek underburden compared to the Wedge area. Xangenese end acid base potential values for Volf Creek underburden ere significantly less than the Wedge area. Mean physiochemical values for each overburden end underburden parameter ere summarized in Tables B and 9 for the entire Yoast study area. All mean values fall within the suitable and marginally suitable ranges es outlined by the assessment criteria listed in Table 5. Variability between the overburden end underburden sections is significant for the dominant cation, particle size, and iron. Xagnesium is the dominant cation in the underburden while calcium is dominant in the overburden. Sand content is 50 percent higher and clay 50 percent lower in the underburden. Iron values ere twice as high in the underburden compared to the overburden. Mixinc end Mitioetion of Unsuitable Overburden Material. Zones of unsuitable material were identified et all sample locations and are documented by parameter end sample interval in Appendix 6-3 Effective mitigation measures will include avoidance, • ameliorating reclamation techniques, coal ext raetion, blending, dilution, and/or burial by normal overburden handling, sample contamination, end Laborator y error. These mitigative measures are also Listed in Appendix 6-3 and are discussed in further detail in Tab 21, ~~ Minesoil Reconstruction. i ouelity Control and Duolicete Samples. quality control is an important part of the Yoast soil end spoil monitoring program. One aspect of this quality control program is to have the primary laboratory facility complete duplicate analyses on five to ten percent of the total samples and on field-split blind samples. IML completed duplicated analyses on 6 of the 58 Phase ]I samples. IML also completed duplicate analyses on four field-split blind Phase 1[ samples. The duplicate analyses, presented on the enclosed laboratory reports in Appendix b-2, were very comparable with the original samples. Variation between the original end duplicate analyses date was not significant enough to change the suitability classification of any sample. Conclusions • Overburden characteristics within the Yoast study area reflect the depositional environments of the coal-bearing strata of the Williams Fork Formation. There is minimal 31 Revised 03/01/95