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so for SAR). Further, the current and proposed overburden handling plan does require <br />placement of weathered material from upper overburden zones as the surface spoil layer. <br />Placement of this weathered surficial overburden as the surface spoil zone prior to topsoil <br />redistribution appears to be the only selective handling practice specified in the mine plan. <br />Please provide documentation or applicable study results supporting the contention <br />that homogenous mixing will sufficiently dilute overburden materials that represent <br />a considerable portion of the overburden (such as SAR and Saturation %). <br />Alternatively, please provide a more detailed response to the original request <br />(regarding separate stockpiling or other measures that will be used to segregate the <br />surface weathered overburden from deeper overburden until it will be used for final <br />reclamation). If selective handling measures other than the placement of weathered <br />sort-icial overburden as the surface spoil layer will be employed, please amend the <br />overburden handling plan as appropriate. <br />Rule 2.05.4(2][:dl Plan for Removal, Storage, and Redistribution of Plant Growth Medium; Rule <br />4.06 Topsoil <br />76. The operator response to this item discussed the future revision that is envisioned to <br />address variable topsoil replacement within the existing permit area as well as the South <br />Taylor project area. We concur that it would be appropriate to address the variable topsoil <br />replacement plan in the context of a comprehensive revegetation plan revision to be <br />submitted in the near future. <br />For the purposes of the present review, please provide the requested narrative update <br />to specify the average uniform replacement thickness. In addition, please include a <br />commitment to include a variable thickness topsoil replacement plan within a <br />complete technical revision to be submitted within 6 months of issuance of the PR-2 <br />proposed decision (see Item 79, below). <br />77. Section 2.05.3(5) of the revision application was properly amended to specify that the <br />annual topsoil balance reporting requirements in Volume 1, Section 2.05 of the approved <br />permit will also apply to the South Taylor project area. Item Resolved. <br />78. Various permit elements, including the annual soil balance reporting commitment, Table <br />2.04.9-6 description of limiting factors for soil horizons in the various map units, and <br />commitment in amended text to use staking as necessary to ensure soil replacement to <br />required depth, are responsive to this concern. Item Resolved. <br />Rule 2.05.4(~(e) Plan for Reve¢etation; Rule 4.15 Reveaetation <br />79. Colowyo amended section 4.15 language to delete the statement indicating that no <br />substantive changes are anticipated. Further substantive text amendments were not made, <br />but operator included discussion of anticipated reclamation plan changes that will be <br />pursued through a future revision to be implemented prior to initiation of South Taylor <br />project area reclamation. The revision would entail comprehensive modification of the <br />11 <br />