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Pond 016 Slide Remediation Plan <br />Page S <br />14. In the Typical Rock Underdrain section, the geotextile brand name is misspelled. Please <br />revise "Marif " to read "Mirafi ". <br />Response: The spelling has been corrected. <br />15. In the current version of the permit, Roads J and K are detailed on separate maps. Once <br />Road JIK 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 />Response: The as-built maps will be updated as required after construction. <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 of <br />the realigned PM-2 channel. A graphic depiction of this embankment is provided on the <br />attached map, a rough compilation of 20-D.1 contours and features onto the 20-D.2 map. <br />This embankment ranges in height from 10 to 25 feet, and is not discussed in the TR-73 <br />application. No source of fill material is identified. Please review the post mine contours <br />propose for this location, and revise or clarify as necessary. <br />Response: Please note that no "embankments" or "structural fills" are being constructed <br />anywhere with this remediation plan. The areas referred to by the Division are simply areas <br />where materials excavated during the slide remediation will be placed onto previously graded <br />spoils within areas previously mined. <br />17. 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 Pond 016 slide area would be counter- <br />productive. Please review the surface drainage patterns for this area and modify as <br />necessary. <br />Response: The entire watershed is <4 acres. SCC has revised the proposed PMT in this area <br />and will install an 18" culvert under Road J/K to drain any potential runoff away from the <br />reconstructed slide area. An 18" culvert is significantly oversized, but reduces the possibility of <br />plugging with trash during spring runoff. <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 />Response: Section A-A' has been revised. <br />19. On Section B-B', Please identify the location where Section A-A' intersects this section <br />Sta. 2+08). <br />Seneca Coal Company* P.O. Box 670 • Hayden, Colorado 81639 <br />Telephone (970) 276-5219 • FAX (970) 276-5222