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M.. Mid~xd BrnJay Onirzur of Mrurats aryl G®lody farWmy 28, 1999 Page 10 Comment 29 - On pate 116 q~Tab 17, SCC states that dx purlnse of ptrtds 015, 016, and 017 is to sajefy hratrtle gout treat rwroljfron a 100-3eirr, 24-lain storm ~2.6 vrdesJ. Elsererrxm in text (page 2, Tab 18J, SCC'states dirt eacfi pirnl Iws bit designel to cmtan mut treat rwtg f jron a 10-ysv, 24-horn storm etau Plazre ale th« ~Y met prottade reui~t pabe(sJ, if appropriate. Page 116 of Tab 17 has been revised to read a 10-year, 24hour stone (1.7 in). Comment 30 -Maps for dx II-W South ama show apre-nmarg stack ~rtd ct tlp dravtabe elute mtd to tlx east ojPond 016. It appems that the pit exanatiat will >e»ote this stork pond 7lx Drrnsicrt ravrvre~rts tlxrt SCL^ ®ssider rtrstahlisllirtg this stack potd at this kratiaz Please proct<ck a pltm for replamrou of the stork pond or provide art explmtatic~ if SCL"das not lxliete trestabttslnmrt of this pond is appropriate. 71tis pond is most likely a beaver pond, in which case, it wouldn't be replaced. It is too late in the 1996/1999 season to determine the type of structure. SCC will investigate once the snow has left in the spring. If indeed it is determined to be a stock pond, SCC will commit to replace it, per inforrnation contained in Attachment 13-11. z Comment 31 - Surja~ H3drology Map 13-2A induates that acLtitivtal disttsrEet area naroff jrom tlx /I- W South ama zaidl flate~ m exisrcrg Porn 006. This addttiar<d ~' dcrs eat appear to he aosxoual for in dx Pond 006 mata'vrg If appropriate, adjtcst tlx hldraHlic irtpru mcddirtg irtjrnmmcrt to Pond 006. 'Ilte phase N design model for Pond 006 is contained in Attachment 13-4C and depicted on Exhibit 13-6A. This model is considered to be the "worst case" disturbance scenario for the life- of-mine disturbance azea within the 006 watershed. When this modeling was conducted the "Pit and Pre-Stripped Areas" were considered to be at their maximum levels including the anticipated disturbance to the south. Since the time this model was approved, the amount of additional dimrrbed area runoff from the II-W South area would be offset by the amount of additional pit, spoils areas and reclamation work that has been conduced within the 006 watershed. SCC: is considering analyzing a new phase V design model later this summer or fall that would look at possibly reclaiming the area encompassed by the Pre-Settling Basin. We hope that additional reclamation effons over the next six months would allow for us to no longer utilize this Pre-Settling Basin as an additional sediment control measure. Comment 32 - Drairrabe $asor Pond 017 ama is shourt to Ee ater 955 acres 71ris is a uryy large ama wvh sigrrifrcmtt rtmyf uJione ~t m~npmiscvt to tlx mtrdt smaller ama ojdtsunfivtce assaeiatel wuh the prolnsat mar zoo3 pu excatxuimt. Has SCC ctrrsulera! odxr alterrrtttit es to tmatgtg rurtglf five such a /a>br ama? For exmnple, cadd I'vrd 017 he motet closer to d~ dtsturlal pit area eunide of tlp Hublrrxvr Guldi snwrtflartr? Please cartsider altematite to nr~avrg nmgf jrom des uvy tare ltxsvt, telndt prinumly crnsists of wulimrrbal grormd SCC did look at both options mentioned by the Division in this comment during the design phase for Pond 017. Unfortunately, these were not viable options. Pond 017 will be similaz to existing Pond 009 at Seneca II-W to the north and Pond 011 at the Yoast Mine. Due to the nanue of the surrounding terrain and accompanying watershed boundary, the pond was located in the best possible site available for construction purposes and still mee[ the applicable regulations set forth by the Division.