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3. The revegetation cost at the Yoast mine also needs to be updated. Please have the <br />operator update the revegetation cost with 1998 data. <br />4. Seneca states that topsoil replacement volumes were based on the volume of material in <br />stockpiles at [he end of 1997. Seneca estimated the volume in each stockpile based on <br />the topsoil salvage depth over a particular area. Seneca should update the reclamation <br />cost estimate with the actual volume of topsoil in the stockpiles used in reclamation of the <br />worst case disturbance. Please have the operator update the topsoil tables and <br />reclamation cost estimate. <br />5. It does not appeaz that a cost for rip-rap and underdrain material for the permanent <br />diversion was included in the original cost estimate. Please have Seneca update the <br />reclamation cost estimate to include rip-rap, and Mirafi 7700x armored erosion control, as <br />specified in the permit. <br />Let me know if you or the operator have any questions. <br />Enclosure(s) <br />c:\esc\misc\980211 <br />