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C-1982-057 TR-73 <br />Engineering-Geotech PAR No. 2 <br />31-May-2011 <br />Page 4 of 5 <br />This item has been satisfactorily addressed in SCCs response. The Division observes <br />that there is a fairly abrupt grade transition at the beginning of the road alignment, to <br />10.1 %from the existing grade, and a similar sharp difference at the end. We <br />understand that certain elements of this project will be "field-fit", with final as-built <br />plans provided when construction is complete. <br />13. On the profile view, please incorporate the locations of cross sections B, C, and D; and <br />illustrate the proposed underdrains and culverts at their locations and elevations. <br />This item has been satisfactorily addressed in SCCs response. <br />14. In the Typical Rock Underdrain section, the geotextile brand name is misspelled. Please <br />revise "Marifl" to read "Miraff'. <br />This item has been satisfactorily addressed in SCCs response. <br />15. In the current version of the permit, Roads J and K are detailed on separate maps. Once <br />Road J/K has been reconstructed with TR-73, the as-built maps in the permit will need to <br />be updated to show the final configuration(s) of the road. <br />This item has been satisfactorily addressed in SCCs response. <br />16. A comparison of the existing topography (Exh. 20 -D.1) with the Post Mine topography <br />(Exh. 20-D.2) reveals that a large embankment is proposed for construction to the NNW <br />of the realigned PM-2 channel. A graphic depiction of this embankment is provided on <br />the attached map, a rough compilation of 20 -D.1 contours and features onto the 20-D.2 <br />map. This embankment ranges in height from 10 to 25 feet, and is not discussed in the <br />TR-73 application. No source of fill material is identified. Please review the post mine <br />contours proposed for this location, and revise or clarify as necessary. <br />SCC responds that this is simply an area where materials excavated during the slide <br />remediation will be placed onto previously graded spoils within areas previously mined. <br />Please describe the foundation preparation, methods of placement, and the type of <br />compactive effort that will be employed for these materials in order to guarantee <br />stability of the fill. <br />17. The post mine topography described in 16, above, would also appear to require the <br />construction of an additional channel, identified in green on the attached map <br />compilation. This drainage has not been addressed in the application, and the Division <br />observes that directing surface flow toward the Pond 016 slide area would be counter- <br />productive. Please review the surface drainage patterns for this area and modify as <br />necessary. <br />This item has been satisfactorily addressed in SCCs response. <br />18. On Section A-A', please identify the location where Section B-B' intersects this section <br />(— Sta. 2+30) and the locations of the proposed Underdrains. <br />This item has been satisfactorily addressed in SCCs response. <br />