Laserfiche WebLink
Page 2 <br />l:ugcr PunsC.un <br />,Tune 11., 1980 <br />Emling's report presents an anlysis of potential subsidence based upon empirical <br />evidence from pnsC r_xtraCC:i.on wiChi.n the Sunland lea:;e boundaries, as well as <br />subsidence pco_jecC:ion Cechn~iques employing accepted methodology. Rock quality <br />designation coring rLZta nod rock mechanics experience are also utilized in <br />preparing the nna~lytica~L subsidence prediction. <br />'Che Sunl;md Co. applicac:i.oa proposes a subsidence control plan, based upon <br />Hinling's analysis, for Che proCection of the affected structures, stock pond and <br />renewable resource wands. The requirements fora subsidence control plan are <br />~,.nnuuo-a Crd in '30 C1'R 7fl4.20, and arc eFf:ecCivel.y idenCi.ca1 to the analytic section <br />of Colorado's proposed permanent regulaCions. As such, Che Apex 112 dine Subsi- <br />dence Contru~l. Plan appears to saCisfy aJ.l of. Che requirements except one. The <br />Subsidence ConCruL I'J.;ui is rr_qu~ired Lo con Cain; (30 CFR 784.20 ;c)) <br />"A Jetai.Led dr::cripC.i.on of Clue uicasures Co be Calceu Co meCi.gate Che atfecl's <br />of nny material dimnaturc or diminution of value or foreseeable use of <br />.Land wlricl~. in;iy occur, including one or more of Che following as required <br />by so cPl; s;17.124 - <br />(J) P,esCrirnLion m- rehab~il~LtaCion of: structures and features, including <br />npprr~:;ima tc I;ind-rurfacc r,uncou rs, Co prom Ln~inl; condiCion. <br />(2) I;cl~lncc•innni. of sLrucCures dc..^.troycrl by subsidcnr_c. <br />(3) I'urchnsc of structures prior Co mining and resCOration of Che ]and <br />a@CCr r;nhs irlence. Co cundi.C.irm capable of supporting and suitable <br />For Che sCrucCUrr_s and foreseeable land uses. <br />(=a) Purchase of non-cancellable insurance policies payable to the <br />;urFacc ocrncc i.n the f:ul.]. amount of: the possible material damage <br />toe other comparable measures." <br />The applicant, in order to fulfill the permanent regulation requirements, will <br />have to amend the application in order to respond to the requirements of sub- <br />section c. <br />The application also contains a proposed subsidence monitoring program. The <br />proposed system, with the addition of the monitoring of the location, elevation <br />and configuration of the affected structures and periodic surveying of all of <br />the installed monuments on a quarterly basis will suffice to fulfill the require- <br />ments of the proposed permanent Colorado subsidence regulation. <br />I'urCaL 6aclcf.i:LJ.ing <br />'Phe applicant proposes Co parCially backfill the portal bench by placing material <br />aC appror.~imatdLy n one to one sJ.ope, ]caving a 5' to 8' horizon Cal bench to act <br />as a protective debris cntrhing terrace to prevent boulders from rolling onto the <br />county road below the portal. A depth of fill above the coal seam would be 8' to <br />10', but the sJ.ope would be too steep to allow grading, topsoiling or revegetation. <br />