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Ti lerrurl -�- ;eptemar 20, 1983 <br /> (3) The current ,ubsiaenwi- monitoring scheme will not at iow jeterrnination <br /> of an angle of draw sutf ic:ient to discern between the oiler atur's projected <br /> 150 from vertical and the inpusec 200 angle of drdW. Closer spaciny of <br /> subsidence monurnenvs wuu Id ue required in order to dcCOMpl i sh the necessary <br /> discrimination. <br /> The . .aerator' s pr•ipu„d mokitoriny plan aneWent requests "that ur ly thoa: <br /> Points in e_ lose pr)Ximit / Lu areas from which coal is being extracted oe <br /> rnoilitured at the fregiency now specified in thu approved plan (see map), and <br /> that those remote stations outside the area of raining influence (computed with <br /> a ardAl any le of 350) ue surveyed only in the last year of the permitted <br /> five-gear plan." The amended subsidence monitoring net map I'd-r-2 indicates <br /> cessation of monitoring of monllHents MC-1 and ML-b througn Pic;-9. Monuments <br /> Wn and MO-6 have demonstrated subsidence movement in Ooth AN and 1983 <br /> ooservations years. In order to determine whether additiundl subsidence <br /> adjustivants occur, and at what relative rates, these two monuments should be <br /> a-Wored until cessation of movement has been demonstrawd. Monitoring of <br /> "u,iu ;4nts and MIL•-7 ti,r•ouyh rllC-9 can be uvaneu unti I the final year of the <br /> peen i t tern. <br /> We sues i dunce reuort preuared by Mine subs iatnce E ng i nu ri ny Cowpany uuservas <br /> i nat -urrtrol point TOO, used to survey emnuments MC-1 , W-t anu HL-3, has <br /> `;un rued. The operator must reestablish c;,;Ural apprupr i :.te co cuntinue <br /> i,' oniturinj of those Lnrte monuments, in order to µlW cu"plutiin of next. <br /> s :s'n' s molitoring. <br /> The op-raror proposes tree insLalldtion or six Witionai monuments, ri;,AU <br /> tnr.djn how-15, indicated an the amended w5idenco monitoring net ;nap I'd-r=-i <br /> in •reen, not red as indicated in the lever requesON; a,ir`Mllent. These <br /> suiswence monitoring puiaLs should be installea ana surveyed for control as <br /> sain as possible this fall . Tnes:: munur�ants shall ne i ,,_.LAIM as depkLeo <br /> and described in "Gnaracteri zat ion of Suos iuence dvor A Vi[' N _ eft L_ongw i a 1 <br /> r'aneig" by Gol lin stewart. of Mine Subsiue ico_ iAgint •ring wnpa <br /> It is injerat ive that then proposed subsidence monument Antdl latiun and' <br /> reestdul i shment of surva cuntril be acLampi isileo as soon as ; ossiDle. it ig <br /> unfortunate that wv oiler ator did not submit a more app ropy iately timed <br /> request fur dmend„teoc. ine submission, dare, Septembur 12 36d roceived oy tO <br /> UivisWn September 14, K33, allows little We LO dc:compl ish the required <br /> WAS. the operut is revinued that c:omplianre with the approvA snusidenc'2 <br /> m; Woring plan rawatris I& rehuonsibility of the operator. f . lure. to <br /> complete the propissO suosidence monument in>tallation dW „_trvey ..:oArol <br /> rues: ao isMhL this fall ',ray result in lures of vaivaolu :iUtJAi.OWe Grata, <br /> which i ;trt by ex1royely 11!'..lortant in r"esolvin:f future wa nittiog-relatui <br /> /"r t <br /> cc: Brian Muns )n <br /> Poc. No. J009 <br />