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Page 8of10 <br />INS7RUMENTA770N SITE PLAN <br />ARAWNG s, v 1.6 <br />NUMBER BOWE RESOL$= LLC <br />L.5 BOWE,#2 GOB PILE <br />o¢ra eounn. caoRaoa <br />P` <br />12- 101 -6EO vnx.fem9esze GeRISPo1N909�5 <br />PLACEMENT AND COMPACTION <br />Density <br />Quarterly reports indicate that the emplaced coal mine waste consistently meets the requisite <br />minimum level of compaction: 90% of the standard Proctor. In 2013, only 6 tests, out of 196 <br />failed this requirement and required reworking, and the average level of compaction was <br />approximately 94.5 %. This represents an improvement over 2012, when the average <br />compaction was 92.7% and reworking was required for 15% of the tests. <br />Moisture Content <br />The ability to achieve compaction is closely tied to the moisture content of a material. The <br />closer the material is to the "optimum" moisture content (OMC), as determined in the <br />laboratory, the easier it is to compact the material in the field. <br />Buckhorn's recommendations regarding moisture content include the following: <br />• Feb -2006 Section 7.0 <br />"It must be emphasized that pore pressures are a crucial component of the stability of the <br />gob stockpile. Due to the fines content of the gob material, pore pressure dissipation is <br />anticipated to be a slow process. Therefore, it is critical that gob materials are not placed <br />wet of the optimum moisture content." <br />