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Pond Designs
<br />Historical Design Information and Update Pond Schedule — Exhibit 8P
<br />Pond A — Exhibit 8H
<br />Pond B — Exhibit 8F
<br />Pond C — Exhibit 8G
<br />Pond D — Exhibits 8H, 8H1, 8H2
<br />Pond E — Exhibits 8E, 8S
<br />Pond F — Exhibits 8I, 26
<br />Pond G — Exhibits 8H, 8J
<br />Pond T — Exhibit 8Q
<br />6MN Pad Pond — Exhibit 8X
<br />18LT Pad Pond — Exhibit 8DD
<br />Water Treatment Ponds — Exhibits 8A, 8C, 8C-1, 8K, Maps 26, 32
<br />Fish Creek Tipple Pond — Exhibit 8 Fish Creek Tipple Permit Supplement (Sediment Pond E)
<br />Area 1 Pit — Exhibit 8V
<br />Thickener Overflow Sump — Exhibits 8W, 81313
<br />6MN Reservoir — Exhibit 8CC
<br />Diversion, Ditch, and Culvert Designs (Note that designs for ditches and culverts associated with a specific
<br />pond may be included with the pond design information)
<br />Exhibits 8, 8D, 8M, 8N, 8R, 8Y, BAA, 8EE, 26a(1)
<br />Small Area Exemptions
<br />Exhibits 8B, 8C, 8E1, 8E1a, 8L, 8T, 8U,
<br />2.05.4 — Reclamation Plan
<br />47. Page 2.05-108 indicates the depth of topsoil placement is shown on Map 29. This information is not depicted
<br />on Map 29. Please update Map 29 to depict the depth topsoil will be placed over the reclaimed areas.
<br />Response: - As discussed in the previous response to Comment 36, soil depths can be highly variable, depending
<br />on a number of factors. The reality of soil removal/replacement operations in the field, is that TC attempts to
<br />recover all reasonably available and suitable soil material from new disturbance areas, and places these materials
<br />in stockpile for later replacement during the reclamation process. Soil replacement operations and depths are,
<br />therefore, limited to the stockpiled soil materials that are available. Table 49a, Topsoil Stockpile Summary,
<br />identifies soil stockpile designations and corresponding volumes. Generally, if the stockpiled soil materials are
<br />associated with a specific disturbance area, all available stockpiled material will be replaced on that area, with
<br />reasonable efforts to replace the soils at a uniform thickness. Where there are multiple stockpiles associated with
<br />a larger disturbance area (ie: the Mine Facilities Area), the overall stockpiled soil material volume will be
<br />allocated so as to provide a relatively uniform replacement depth over the entire area, with soil recovery from
<br />stockpile and replacement on reclaimed areas generally scheduled to minimize haul distances where feasible.
<br />Given these considerations, it is not practical or appropriate to show soil material replacement depths on Map 29,
<br />and the noted reference has been removed and replaced with a descriptive discussion outlining the practical
<br />considerations noted. Copies of any revised text pages accompany these responses for replacement in the PAP.
<br />TA2 — It is not clear from the provided information in the permit what the final topsoil depth will be after
<br />reclamation. In TC's March 27, 2018 response, they stated "if the stockpiled soil materials are associated with a
<br />specific disturbance area, all available stockpiled material will be replaced on that area, with reasonable efforts
<br />to replace the soils at a uniform thickness. " Please clarify the association of each stockpiled soil materials to a
<br />specific disturbance area as this information is not currently in the permit (this information was once provided on
<br />the 6/28/2006 version of Map 29). Also include what the uniform thickness is proposed to be for each disturbed
<br />area based on the stockpiled soil materials associated with that area.
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