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D. Acid-forming and Toxic-forming Spoil <br />The applicant has submitted analysis of the geochemical characteristics of the <br />overburden and interburden found in the Seneca II Mine permit area. The sample <br />parameters can be found in Volume 3, Tab 6. Acid and toxic-forming materials will <br />not constitute a problem in the Wedge mining areas. The applicant submitted <br />appropriate mitigation measures that will be utilized in the Wolf Creek mining area <br />whenever acid-forming spoil is encountered within the upper three feet of the graded <br />spoil. <br />All overburden of poor to unsuitable quality has been identified in Appendix 6-4, <br />Tables 5 through 13. The increments identified included poor to unsuitable zones of <br />clay, sodium, manganese, nickel, zinc, lead, cadmium, nitrate, pH, and acid-base <br />potential. All poor to unsuitable quality under burden will not be disturbed during <br />mining. These areas will be mitigate:'oy avoidance. Regraded spoil from the <br />tennox highwall reduction area will be sampled on a 300-foot grid and tested for <br />sodium. Exposed sodic strata will either be buried in the final pit or covered with <br />two to three feet of suitable spoil. Several of the poor to unsuitable zones represent <br />less than 15 percent of the overburden volume. These areas will be mitigated by <br />mixing. This includes all unsuitable clay, nickel, zinc, lead, cadmium, pH and acid- <br />base potential zones. <br />Spoil sampling is concentrated in the Wolf Creek reclamation area. Spoil will be <br />sampled on a 300-foot grid prior to soil redistribution and analyzed of pH, EC and <br />acid-base potential. A selectively handled suitable spoil top dressing or lime <br />application will be made where acid strata is encountered. Sampling will also focus <br />on the high clay areas. The spoil will be deeply ripped or chiseled plowed where <br />clay strata exist on the spoil surface. <br />Pursuant to 4.05.8(3), temporary storage of acid or toxic forming spoil may exceed <br />30 days if the operator demonsVates that burial or treatment is not feasible within 30 <br />days due to weather conditions or other specified factors, and will not result in <br />material risk of water pollution or other environmental damage. If deemed necessary <br />by the Division based on the quantity, location, and chemical characteristics of any <br />temporarily stored acid-forming or toxic-forming spoil, such spoil shall be placed on <br />impermeable material. <br />E. Surface and Ground Water Monitoring <br />Ground Water <br />Ground water hydrology information can be found in Volumes 4, 5, and 6, Tab 7 of <br />20 <br />