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~= wes~nN <br />_ Fue~s-vrnx <br />INC. <br />A Sutuidrarv <br />of - <br />- WeYnr+ FueGs <br />_= Axwaulion. Irsc. <br />REPORT OF INVESTIGATION <br />DATE: 3/3/94 <br />SUBJECT: REFUSE PIT PILOT COMPACTION STUDY, REF. NOV C-93-156 <br />BY: WILLIAM C. LEPR~/ <br />This report will attempt to address the confusion and concern <br />associated with the methodology used to test for any compaction <br />bias caused by excavating test pits with the FD-30 bulldozer. The <br />question of pit compaction arose with the issuance of <br />NOV-C-93-156. This notice raised questions as to the percent of <br />proctor each lift was compacted to. This confusion was further <br />compounded by a basic misunderstanding of the operation of the <br />Troxler moisture-density gauge. <br />The operation of the Troxler meter will be clarified first, as the <br />rest of the testing and conclusions require confidence in the <br />results produced by the instrument. The Troxler model 3411 <br />moisture-density gauge is a device used to determine, by nuclear <br />methods, the moisture and density of most common soils and <br />foundation materials. The Troxler moisture-density gauge is <br />actually two different type types of detectors, connected by a <br />microprocessor, housed in one case with a common display. Two <br />different styles of nuclear detectors are used to gauge moisture <br />and density respectively. The Troxler meter when used according to <br />the instruction manual provides results in accordance with ASTM D- <br />3017-88 and ASTM D-2922-91. These standards are for the <br />determination, by nuclear methods, of soil moisture and density <br />respectively. The Troxler meter has many different modes of <br />operation. This report will only describe the methods used in <br />conducting testing on the refuse pits. <br />Deserado Mine <br />P.O. Box 1067 1 <br />Rangely Colorzdo 81648 <br />Telephone 303/675-8431 <br />7rJecopier303/675-5229 <br />