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121'" ['states-TR to :\ licatiun 2 Juh' 9, 2t1fY.'. <br />The primary reason titr dte high Jcgrec oC dope stability at this pit, anJ the ability to s;d'rly entpluy ntinirnal <br />setback disutnres, is a result of the implied commitment in the. Ground report that the ptt Operator wtll <br />excavate the back cut to a ,lope nu .ch•c•/+c•r shun I .iFl: I V. \\'henever att :lpphram pn,poses tt, excavate at a <br />prescribed dope angle, it is imper;rtive Ih:n the U~1Ci cmphasite that the resttlt of the proposal will hr to <br />limit the pit Opcruur's 1~l`xlhlllh' In IhC progression of the excavation. tiincc the stability of valuable offsite <br />,trucwres depend on maintenance of the I .SI I: I \' workutg pil ,lope, this sloping would he :m enli,rccahle <br />cundiuun ul the mined land reclamation pcnnit. 'fhe b~1G would view any trau,gressiun of the sloping <br />requirentcnt, i.c. any slope, steeper than I SH;14' located within ~txl fcet of any uflsitc stntcutre, to he a very <br />serious viohttion to the terms o(the pernut and nr the ('uloradu L:uxl Rrclanuuion :\ct for the Gxtraruon of <br />C'unstntction Materials. Given the intportanee of the sloping reyuirentem to the prutecuun of offsite <br />structures, the I)MG h:u the following suggestions: <br />• l~hc Applicant should describe, in terms ol'the mechanics of earth moving, how the pit <)per:nor will <br />maintain the 1.511: I V working slopes over slope height. of between -00 and 5(I feel. 'I~ypirtlly. a pit is <br />excavated from the toe of the slope and the pit walk progressively c:nc into the pit leaving near vertical <br />pit walls :it the wurkutg face. At a small percemagc of gravol pits, the Operator will work Irtun the top uC <br />the hank and push m:nerial down inw the pit 17tk+r; using this mining method shallow ;miles ;it the <br />working face arc easily maintained. However. slulxs steel,er than 211:14' arc not sale tier the operation of <br />ciluipment. "1'he preceding discussion Icads to the I)MCi's inquiry :rs to hove the pit Opcr,uor will work <br />with ISH: I V slopes :ts required to he in a,mplianre. <br />• To increase the pit r)perator, flexibility in the methods employed to contplele the excavation, ltte <br />Applicant may want to consider an alternate ntethtxl fore>tahlishing and measuring the setbacks required <br />fur [he protection of o(tsite stntcturc,. l he ti,llovvutg diagram illustrates this Ixr. sibility and also slit+ves <br />the relationship between the easement lint and the I~ulnm Uitch hx~ation as discussed ahoy. <br />71te foregoing diagram illustrttes th:u establishment of the cnti,rceahle ecthack from the stntcturc to he <br />protected w the n+r• of the pit slope, rather than establishing the setback dist:utcc front the cast ul the slope, <br />