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Mr. Midxra' Baday Drcimat aJMurerals mr! Cmindy Jmsrmy 28, 1999 Page 4 nferet~ area data from the South Black mme arcs ortlj; as depicted on Map 10-3, rn asixdxr Jx South Black extendm'>r feretre auras ieoWld fx ~tddal at ° m tlx ameztly appratel permt aura extendal referat~ areas. Gh page 43, Sectiat 1 D.2, toiler Bac raorl, it u statal dtzt "all tottLsnrrl~l »atite xt~etatiot withvt tlx pn~osa~ Sena-a II-W Sowh Extension arm v~ll Ee tc~el m deta'op a -ttbeuuun drug set m !x usel for m~r8rnievt m the n~lamtel area stgetaziat data sec ° This would seen m irrtpfy that, for fzvtd release ompzasau, the South Extension area atadd le separately etr(uated fimt otlxr purlieu of tlxlrmvt aura, arrd tJaat tlx tuo pe~»rut area hGzks ucwld fx ludgaf against flea separate extotdal nfereue aura data seu. Horuu, nanatite of Tab 22 searu m imply that urtdisttrrlxl atgetaticn t}prs in the arrn~u pemit area and tlx South Extensiat asarld fx mrtlvtel irw a single exterttlel referer~ area, Ftur{~ at~age-39~a~?,s._~*~s an aner~e breakdou,: of tlp fact rrryor rtgetation ryprs" m lr usal rn dr extendel nferet~ arra cvrtpnisar srtrrylvtg. 71x Staff Mountain Brush atgetatian tylr is not vta4tclal as a major atgetanart type", and this wtuld appear m {x an otmtghL 71x cGsocssion aryl farrr¢rlas an page 39 arul the folloreotg pages uhid> >efer m fast zcbrtatiav: apes noel to fx trplruel m rt~t inmrprnatior of the South Extensiae Aura, and tlx ztgetaliot t}pp acrea~s meal m lr adlwted acm~datgfy. In stormtary, rrarratzte Hauls m be arrmadsl m darify the extendal refnaue aura cn'ymisat apprtwdi, and "maor ztgefattot ty/.e"listvrg and acmages earl m he rspaiual as appropriate First, the proposed southern extension of the Seneca II-W Permit Area is identified as the - "Seneca I]-W South Extension" of the cwTently approved II-W permit area and noc an "Expansion" as DMG has incorrectly labeled it. Second, Exhibit 10-3, Pre-mining Vegetation Types & Sample Location Map II-W South, is an extension of Exhibit 10-1, Pre-mining Vegetation Types and Sample Location Map, and was not presented to indicate a "separate" permit azea. However, for ultimate reclamation purposes the II-W South Extension area is proposed as a separate extended reference area and the future reclamation success of this area will be based on standards determined by the adjacent South Area extended reference areas and not by the II-W reference areas. Tab 22, Revegetation Plan, has been updated and revised to address the extension of the II-W area into the II-W South area and includes steep mountain bntsh vegetation types in the selection of II-W South reference areas for comparison sampling. Comment 14 - Bastrl on rrarratite of pale 48, Tab 10.2, and Tape IOG-4, it aplxan that sarrrp'e adelrtary caladatimt errtplo}el a tuo-tailel t atali+e wvh n-1 degrn?s of fim/crn ar 0.2 alpha error proGal~ility (80% ctmftdo7a? /eta'J. Dirnsian gtadela:es spxih' that pre-mere smrrple adeluacy etalawtim erTploy a tuo-tailed alpha earn prohsbrliry of 0.1 (90 % catfrdet~ fetal), urd~s a maxvraan samp'e srze of 50 is atravtaL C -~/( Although the sample adaluacy fomutla tcsel apparauly did not tmrpry with that spxifsl vz dx guulelcte, it appears that maxmaon smraple size of 50 aeas attumel for all praltariot sarrrp/es, acrd fleet sample adelttacy at tlx Cuo-tailel, 90 % letd wss met for inter far a!I Lyles, with tlx exmptian of uestem ulxatgrass/alkali sagrbncsh of jtcral inter, mtd steep ntaartain brush a~a-ref inter For tlx fom7e , 15 srmxpde obserrruic-u aeem made, arhiile srvrtple adequruy fomwla indirams 21 rrmtsctYS aeald hate ~ reluirai For Jx latter tylc, i 5 rrartsaYS zeee net, wish tle srartple aderjuucy frn»aJa axluatmg tlxu 22 vear/d herte bar nguireL In Enth rases, tefervt~ arra ester smrtple rr~im excarlaf tlx affmal area sample meat, and it is zery unlikely that nrne intoasirx smrtplmg aeould hate alteral dx devemrowtiot rtgardmg suital~rliry of tlx extatdel teferotm area