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C-2010-089 <br />New Horizon North Mine <br />PARNos. I-IA-1B, 2-2A-2B1, 'I <br />Page 44 of 60 <br />10. The first paragraph of the Regraded Subsoil Backfill Material Monitoring Program <br />subsection (page 4) mentions inspecting for compaction and slippage potential. These <br />problems would seem to be unlikely, if ripping is conducted as described on page 6. Please <br />clarify whether the inspection will be done prior to, or following ripping. The last sentence <br />of this paragraph lists various parameters that will be analyzed. Please include a reference <br />to where in the permit the suitability criteria may be found. <br />.S'()il suitability critei-ictai-e,lc)itiicliii fable 2.05.4(2)(d)-l. Item resohWinDec-201.1 <br />resj)onsc;% <br />11. In the Unsuitable Subsoil Backfill Mitigation Plan (beginning on page 4), item 2 describes <br />scarification measures that will be undertaken when necessary. The list includes ripping and <br />chiseling. The second full paragraph on page 6 states that regraded backfill material will be <br />scarified prior to topsoil placement. These two statements appear to contradict one another; <br />in one case, scarification is optional, while in the other it is done as a matter of course. <br />Please review and revise for clarity, as warranted. <br />Item 2 on 1')c�ge 4 hcis, been reWsed: re,,grct(1e&V)oi1 malerial wiH bc sccirified Itent resolve(I <br />in Dee-2011 response. <br />12, In the last paragraph on page 5, the sixth line gives the overburden thickness (above LDx) as <br />60 to 65 feet. Comparison with the cross sections seems to indicate that the thickness ranges <br />from 60 to 90 feet. Please review, and revise the text if warranted. Additionally, please <br />describe the thickness of the two thin clay ("Bentonite") beds. <br />The over hur(len thickness was, revisect, and c/ay thickne,vses cn-e jn-oi4cled in �ection 2. 04 6 <br />beret resoh,ed in Dec-2011 response� <br />13. Soil Suitability is addressed beginning on page 9 of Section 2.05.4(2)(d). At the top of page <br />10 is a table, which purports to be reproduced from Table 2.04.9-2, (Rather than being <br />found in the NHN application, the table appears to have been derived from the New Horizon <br />Mine permit; the table should be numbered differently.) There appears to be some <br />confusion over the suitability parameters and criteria that will apply to replaced soil, subsoil, <br />and overburden. Appendix I of the WyDEQ guideline lists several parameters that are not <br />included in the table on page 10. Please review the suitability parameters and criteria, to <br />ensure that the application consistently presents the appropriate information. <br />bN <br />9 <br />14. Available topsoil resources, as established by the baseline soil survey, are depicted on Map <br />2.04.9-3 Topsoil Salvage Map. A table is presented in the lower right comer of this map, <br />showing salvage volumes by soil type and polygon. Soil Polygons are numbered I thm 45, <br />and are of varying sizes and soil types. Each polygon consists of a single soil type; the <br />volume of soil available is given for each polygon, in BCY (bank cubic yards). The <br />Division has additional requests regarding the data presented in the table on Map 2.04.9-3, <br />as follows: <br />a) Soil polygons 9 and 10 straddle the line between the Glasier and Meehan properties. <br />Please divide each of these polygons by landowner, e.g. 9A and I OA for Glasier, and <br />9B and I OB for Meehan. <br />