2002-10-15_REVISION - M1983208 - Laserfiche WebLink

Home Browse Search

SMAVANO GRAVEL, EXN70lf D /~Mf/nwd~ Worked-out arras of finished excavation shall fx graded smooth and utilized &+r stockpiling and processing operations during the remainder of the extraction and production operations. Acreage not needed for such operuwns shall tk prcpurcx! li+r industrial yardsite post-permit use with revcgetatcd rcvcgctatcd sidcslopcs, per the Exhibit F. Rcxaantatatn 1'Imi', for release tiom the permt area. (cJ 'There are no water impoundments and diversions other than limited surl~ce rainfall runutl'. That runotT shall be directed to the lower elevations of the excavated gmvcl pit. 'the hydrologic balance shall rrnwin unchanged at the site, sink no gmwtJ water is to he encountered. l'he surface of tln mesa top shall be lowered by I ~ to 20 fret in the liven of a lowered finch, which is to be 'daylightcd' to tln rx+rth, norltnasl, and to the west in portions of the southwest perimeter Surface moisture shall fx retained ti>r utilization in the rc-vegetation cRort by flat grading and 3-toot retainment f><rms incorporated into the finch crest. (d J ;4fining shall continually proceed at the lull width and depth of tin rtnsu-top resYturce deposits fn,m the current highwall tuvc:ud the southeast end of the permit arc:t, with no particular "seyurncing" or "mining units" prcscribeJ. I{xcavatiun shall daylight out to tln nnsu dowroslope at the north, nurtite:ut, northwest, and portions ol'the southwest edge ol'thr permit area, except where prevented by proximity of tln pmpcrty fxwndary. The northeast, easterly, and southcyct txwndaric~s of the excavation shall tenninatc in a three-horizontal to one-vertical slope bank adjacent to the cemctary access road. eenntary, and cast wooded slope h:utk of tin nnsa. 1're-existing pit excavations aril overburden stockpiles cover atwut Ift acres of the 49.11-nc•rr proposed permit area. Continued extension of mining to the southeast shall add atx+ut 2?!4 acres of gntvcl rescttuce excavation" (eJ ,\'on-phu.+•rd openations shall resume in the fi,rnmr I IZ pcrntit area excavmion approximately in the winter or spring of the year 2002 and proceed to exhaustion of the available gravel deposit resources at the site at a rate of uppruxintately one acre per year. Cumplction of the ren>itinder of tfn excavation to the southeast excavation limit is exlx~cted u+ take I S or morn years depending upon needs of the County Road lkparunent within the region. Mining slutll proceed southeast in an exposed face approximately d00 lief wider h+rdcring a twenty-five tixn setfxmk at the eenntary and its access road at the northeast end, and Utc nmsa Jownslope or property boundary at the southwest ctx1. A sloped headwall face shall tie maintained throughout the mining operation. [fj Saul ~ gravel deposits to be mined are well rounded, well-graded, 10-inch-minus alluvial rock deposits lying in depths of tiflcen, up to shout twenty feet deep (fNil. judging hum excavated puniom of the site. "Pest pits dug in un-mined portions of the site revealed gntvcl resource as deep ac the backhoe could reach (16 feet). Clay, shale, ;trtd smxlstotm fads underlie the alluvial gravel deposits to tx mined. (txiil. Gravel depths and the surface ofthcir original deposition arc typically inconsistent. (gJ Sartd R grovel mined and processed is to be used as rock aggregate in local county roads highway comtructiwt and ntaintenatxe projects. (hJ 'I'hc only incidental product is rock rip rap derived from the Dakota Sandstorm Ixds encountered in the pit fxatom at the west rim of the rrns:r. Some stockpiles of that material are already stockpiled within the permit area. (iJ Nu explosives arc to be usexi in conjuctiun with any site operations. 'temporary stockpiling of grovel, sand, ruck rip-rap, and toputil arc to occur concurrently with resource mining and urLwnin~%crushing production opemtions at ttn pennited site. Operation of a hot asphalt mix plain. utilizing produced rock aggregate, shall also occur intennittantly on the site.