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u <br />Mr. Michael Boulay <br />April 8, 2014 <br />Page 2 <br />Response: Rock Drain refers only to the portion of Segment C running southeast from the solid <br />pipe entry. Trench Drain refers to the overall system. Rock Draw has been removed from the text to <br />avoid confusion. <br />DRMS Item 5. Please explain the basis, for selecting rock sizes shown on Details A and B on Map <br />2.05.3(3) -21. <br />Response: The rock sizes are selected based on engineering experience to insure the stability of the <br />installation. <br />DRMS Item 6. More detail is needed regarding the pipe connection at the lower ends of Segments <br />A and R Will a "T" connection be used.? Neither the text nor Detail C on Map 2.05.3(3) -21 <br />provides this information. Also, in Detail C why are there two colors of rock that appear to be the <br />same size? Please elaborate on this nexus. <br />Response: The three routes of rock will all drain to the same nexus point shown on Detail C in <br />magenta. This is the reason for the color difference. The solid pipe is placed on the north side of the <br />segment nexus, and located at the bottom of said nexus to facilitate the flow of water into the pipe. <br />A plan view has been added to Detail C to make this clearer. <br />DRMS Item 7. On Map 2.05.3(3) -21 a text box pointing to the nexus of segments states that "Rock <br />draw drains into perforated pipe. " Is this incorrect? <br />Response: This text now says "Rock drain'. <br />DRMS Item 8. On Map 2.05.3(3) -21, Segments A and B are shown approximately 15 feet from the <br />highwall. However, Detail A indicates that these features are located much closer. Please explain <br />this discrepancy. <br />Response: The mine highwall line has been moved to be adjacent to the trench drain to match <br />Detail A. <br />DRMS Item 9. The spoil spring is not shown on Map 2.05.3(3) -21, although the proposed text <br />indicates that this location is shown on the map. <br />Response: The spoil spring has been added to Map 2.05.3(3) -21. <br />DRMS Item 10. In the approved PAP, the surface water hydrology map showing post mine <br />drainage areas (Map 2.05.3(3) -1 -2) indicates that the area that reports to Pond 013 is 82.9 acres. <br />However, in the SEDCAD model documentation in the TR -63 submittal, the drainage area is 38.11 <br />acres. Please explain this discrepancy. In general, more detail is needed regarding any changes <br />(from the approved model) to the hydrology inputs. <br />AN EQUAL OPPORTUNITY / AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy`Cooperative ,: <br />