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C-1982-057 TR-73 <br />Engineering-Geotech PAR No. 2 <br />3 1- May -2011 <br />Page 2 of 5 <br />Given the high clay content of the native materials, and the proposed relocation of Road <br />J/K across the Pond 0 1 6A fill, compaction should be a minimum of 95% Maximum Dry <br />Density (NWCC recommends 90%), with a moisture content between 0 and 4% above <br />Optimum Moisture Content (NWCC recommends OMC +/-4%). It is critical that Pond <br />0 1 6A be backfilled and compacted sufficient to prevent, to the extent possible, the <br />infiltration of additional moisture into the fill. Lift thicknesses of 12" to 18" proposed by <br />NWCC may be too great to achieve the desired densities. <br />The fifth full paragraph on NWCC page 5 indicates that channel PM-2 should be <br />excavated into "competent bedrock materials ". Test Holes 12 and 13, which are near to <br />the proposed realignment of PM-2, are logged on NWCC Figure #2. In these holes, <br />weathered claystone was encountered at —10 feet beneath the surface, and claystone <br />bedrock was present at 13 to 17 feet below the ground level. <br />This item has been satisfactorily addressed in SCCs response. <br />