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• • III IIIIIIIIIIIII III <br />999 <br />8PON8E8 TO FINAL ADEQIIACY ISSIIES <br />SENECA II MINE PERMIT C-80-005 <br />Technical Revision 26 <br />December 9, 1993 <br />bw 1. Three copies of Exhibit 7-2B, certified by a registered <br />professional engineer, are enclosed with this response <br />package. <br />2. 1) PWCC presented plots of TDS values for all surface water <br />sites in Appendix 7-4B, submitted to CDMG December 12, 1992. <br />A discussion of the surface water TDS plots was also provided <br />~~- (see VIII.B.3.c., "Review of Surface Water TDS Values", Page <br />', {~ 7-324) . <br />~ 2) Plots of other parameters for surface water sites with <br />parameter values exceeding standards have been added to <br />Appendix 7-4B, and a discussion of these plots can be found in <br />VIII.B.3.b., "Comparison of Surface Water Parameters to Water <br />Use Standards", Page 7-318. <br />3. No response required since CDMG modeling results indicated the <br />~ current dimensions of the structures was acceptable. Also, <br />~, ~~for clarification, PWCC did not_agree_to__use CDMG_v_~lues based <br />~~~ ~~ ;gnu'. on total annual precipitati <br />rJ,'~ \ ~g~ ~;•~~4. Page 7-6-3-9 has been revised to contain the dimensions of the <br />~~,,~~ ~ , ~~ new boneyard ditch. <br />• .ti 5. As shown on Exhibit 7-7, the existing Wolf Creek fill <br />~ ~ downdrain diverts surface water runoff from the fill area. <br />~ See Appendix 7-6, Attachment 7-6-3 for design information. <br />~.i~ After mining is completed and once the haul road ramp is <br />.• - reclaimed, the proposed Wolf Creek fill downdrain will be <br />constructed (see Exhibit 12-9 for location) to convene surface <br />runoff around the fill area. Attachment 7-6-3 contains the <br />design information for the proposed diversion. <br />~ 6. Page 7-6-7-2 has been revised and Pages 7-6-7-2a and 7-6-7-2b <br />~'' added to address sample results, storm water routing, and <br />sediment control for the two boneyards and office area. <br />Additional Modification <br />Pages 12-12b through 12-15b and 12-49b to 12-60a have been re- <br />duplexed to conform with the approved page numbering in Tab 12 and <br />~ the revised pages submitted with TR27. <br />