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Although the overburden analyses from monitoring well WWCU-24 do not indicate this potential, it has <br />been conservatively assumed that the same ABP characteristics could also be present at II-W. <br />Contained within this report are evaluations of the chemical and physical data, locations and <br />extents of suitable and unsuitable overburden, and proposed methods of mitigation. Spoil <br />mixing phenomenon is discussed and core variability is documented. A sampling program <br />immediately after mining is proposed to investigate and evaluate mining methods, overburden <br />mixing, and reclamation success Isee Tab 21, Minesoil Reconstructionl. These investigations <br />will be conducted to assure adequate postmine vegetation growth and ground water aquifer <br />characteristics. <br />Conclusions and recommendations are based on the interpretation of laboratory data and <br />lithological descriptions developed during the original sample collection and analysis program. <br />Selection of Overburden Parameters. In 1974, an initial examination of Seneca II-W overburden <br />material was performed by Peabody Coal Company (Peabodyl. Because the analyses completed <br />on these overburden cores did not meet the 1980 State and Federal requirements, additional <br />analyses were requested (Starr, personal communication, 19801. In July 1980, a final list of <br />parameters was decided upon by the Colorado Mined Land Reclamation Division ICMLRDI. <br />Office of Surface Mining Reclamation and Enforcement (OSMREI, and Peabody. These <br />parameters are as follows: <br />- pH, paste <br />- Conductivity IECI mmhos/cm at 25°C <br />- Saturation Percentage ISPI <br />- Particle Size (% sand, clay, silt, and very fine sand) <br />- Texture Class <br />- Water Soluble Calcium (Cal, Magnesium IMgI, and Sodium INaI <br />- Sodium Adsorption Ratio (SARI <br />- Copper ICuI <br />- Zinc IZnI <br />- Boron IBI <br />- Molybdenum (Mol <br />- Selenium ISeI if the pH is less than 6.0 <br />- Aluminum IAI) <br />- Cadmium ICdI <br />- Iron IFe) <br />- Manganese IMnI <br />- Lead IPbI <br />During 1981, CMLRD drafted guidelines for collection of overburden geochemistry data. As a <br />result of discussion between Peabody and CMLRD personnel, four additional overburden cores <br />were deemed necessary to satisfy regulations regarding overburden analyses. These four cores <br />PR03 9 Revised 01/02 <br />