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COMPACTION TESTING PROGRAM <br />Introduction <br />The Southfield Mine coal refuse stockpile has been designed and is being constructed <br />as a permanent storage facility. Both stockpile design and the specific material <br />placement techniques being used in construction of the refuse pile reflect <br />consideration of long-term structural stability. Proper compaction of the refuse <br />materials following placement minimizes air flow through the pile and improves pile <br />stability. Refuse material will be placed and compacted to a minimum dry density <br />of 52 pcf. <br />Testing Procedures <br />A nuclear test gauge, sand cone, rubber balloon, or equivalent accepted testing <br />method will be used to determine in-place refuse densities. Testing procedures, <br />including calibration, adjustment, and actual testing, will be conducted in accordance <br />with the standardized testing methods (nuclear test gauge, ASTM D 2922-81(1990) or <br />equivalent; sand cone, ASTM D 1556-90 or equivalent; rubber balloon ,ASTM D <br />2167-84 or equivalent), and the recommendations of test equipment manufacturers. <br />A minimum of two compaction tests will be conducted at random locations on each <br />active fill bench. The tests will be performed on both the coarse and fine refuse <br />materials following compaction of the overlying coarse lift(s). If compaction values for <br />these test vary significantly EFCI may, at its discretion, conduct additional compaction <br />tests to determine the source of variance and assess compliance with compaction <br />requirements. If the results of periodic compaction testing indicate compaction values <br />which are consistently below design specifications, EFCI will discuss possible options <br />with the Division for addressing related concerns. Options may include additional in- <br />place testing (drive-hammer and spoon sampling) to evaluate the nature and to <br />assess sensitivity to variations in compaction, modification of placement and <br />compaction methods or equipment and more frequent compaction testing, or other <br />alternatives. <br /> <br />Revised 5/22/97 <br />Technipl Revision No. 27 <br />