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iii iiiiiiiiiiiii iii <br />999 <br />Michael G. Altavilla <br />Seneca Coal Company <br />Page 2 <br />September 4, 1998 <br />18. Response accepted. <br />19. Response accepted. Based on culvert designs contained in the permit document, it <br />appears that existing culverts meet or exceed diameter requirements. <br />20.-21. Responses accepted. <br />The Division recommends that all reconstructed riprap channels be implemented with attention <br />to installation technique. Riprap should be keyed at channel inlet and outlet locations to avoid <br />channel undermining. Durable angulaz rock is preferable to rounded rock. Long-term channel <br />instability can result in enforcement actions and/or delays in bond release. <br />If you have any questions please contact me. <br />Sincerely, <br />M:u,~ ~' ~ <br />Michael P. Boulay <br />Environmental Protection Specialist <br />David Berry <br />