Laserfiche WebLink
• <br />or. the order of 10 cis not 1.3 -2 <br />cfs as estimated by WSC. <br />The OS`1 <br />staff <br /> ecama[ed that the total runoff <br />wc~cld be U. SS acre-feet. Since volume resulting Eton a 10-year, <br />an adequate demons[r:i[ion of the 24-hour storm <br />pond/pump <br /> cc~abilities was not made, OSM finds that a stil~nlation is necessary Eor <br /> approval of the sediment pond s ystem. <br />A :;tipulatlon is necessary with ruspect to the s~cbsidence monitoring program. <br />Pursuant to 30 CFR 784.20, when <br />"structures or renewable resource lands exist within the proposed permit <br />and adjacent area and ...subsidence 1` it occurred could cause material <br />damage or diminution of reasonably Foreseeable use of such structures or <br />renewable resource lands ...il the regulatory authority determines that <br />such damage or diminution could occur ...[he application shall include a <br />subsidence control plan..." <br />WSC has presented that a ventilation shaft, road and river exist within [he <br />prcposed permit and ad.jacen[ area, which establishes the presence of these as <br />structures or renewable resource lands, at a minimum (application, p. 45). In <br />[h~ judgement of OS?!, tlc~se features may bz materially damaged or suffer <br />di-inu[1on in value ur Eoreseeble use Sf subsidence occurs. (This assessment <br />of possible damage aad diisinu[ion is no[ Fresentnd by Id SC as part of the <br />73'..20 compliance, p. 45 of the applicatl.r..) The incl~isLon of a subsidenc^_ <br />• control plan is, therefore, required. <br />An nccep[able mrcit^ring nlaa hay be_n pr~po~~~~l by l•1SC. This plan fulfills 30 <br />CFi'. 784,20(b)(3)(v); however, the monitoring p1.3n alone does not provide full <br />c:omnliance with the four requirements Eor a sub~idenc~ control plan. <br />The firs[ requirement, pursuant to 30 CFR 784,20(x), is "a detailed <br />,ien.~ription of the Wining method and other rasocrces to he taken which mxy <br />af.f.~ct subsidence." in addition to prusent detic:riptiuns, a proposed <br />r.hr.;n-pillar rr:;overy sequence must be included, and a discussion of the <br />l+l;.ining and controlling of subsidence, if any, which is anticipated. <br />30 CFR 784,20(b) requires a detailed disc:iptiun <br />to :•revent damage and diminution. The itc.ns to <br />anticipated effects, if any, w:iich may require a <br />subsidence; me:iaures to raduue the li~culihond of <br />he 'aken to prevent caterial damagu or ie~;enir.F <br />~^ocitoring program, at this point). <br />of the measures to be taken <br />M covered include the <br />prediction of probahle <br />subsidence; and measures to <br />of value (Sncluding the <br />30 CFR 784,20(c) reyuires detailed description of measures to be taken to <br />mit'gate the damage or diminution uffects of subsidence. <br />Ficnlly, 30 CFR 784.^_0(d) requires detailed description of measures [o <br />del+•rmine degree of aaterial damagu or dininution. <br />• <br />....y.. . <br />o ~~, myna ~~-~ai - :.^,~':x i_ ~ ~ _....: ~. -:, -' :. _ .~-,..' : -..~~.. <br />