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C-1982-057 TR-73 <br />Engineering-Geotech PAR <br />24-Mar-2011 <br />Page 4 of 5 <br />d. The profile view shows only the proposed road surface. Please add an additional line <br />depicting the existing ground surface. <br />e. 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 />f. In the Typical Rock Underdrain section, the geotextile brand name is misspelled. <br />Please revise "Marifi" to read "Mirafi". <br />g. 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 pen will need <br />to be updated to show the final configuration(s) of the road. <br />a. 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 />b. The post mine topography described in paragraph a, above, would also appear to require <br />the 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 />Exhibit 20-D.2 Sheet 2 Pond 016 Area Remediation Plan and Post Mine Cross Sections <br />Four cross sections (A, B, C and D) are provided at horizontal and vertical scales of 1"=20'. The <br />cross section locations are depicted in Plan view on Exhibit 20-D.2 Sheet 1. <br />S. DRMS comments on Cross Sections <br />a. 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 />b. On Section B-13', please identify the location where Section A-A' intersects this section <br />(—Sta. 2+08). <br />c. A comparison of Section B-B' with the plan view on Sheet I reveals that the centerline <br />of Road J/K is located at —Sta. 2+30 on this section. The Proposed Surface on this <br />section shows a continuous surface 60' in length at >8% slope (Sta. 2+20 to 2+80). The <br />location of Road J/K is not identified on this slope. Please modify this section to <br />accurately depict the proposed configuration (template) of Road J/K, including <br />elevation above the graded surface, roadside ditches, etc. <br />