2016-02-03_PERMIT FILE - C1981038A

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1_.C: ~..-__.,=._c01~ FO:. _EP_':I'P FO?: Si:i?'6CE O'. D},]TJ~Y.iiGvFU N.Ii:IRG 6Cl'IC_T__.: -- P:It~IM11M REQuIREME[.TS FOR OPERATION' ANA RECLAMATION PLAIiS. 2.05,6 Mitigation of Surface Coal Hining Operation Impacts. (Cont'd,) (6) (c) (i) (°_) Subsidence monitoring data will be su^- mitted to the Division annually with CivI's Hydrology-Subsidence keport. (F) The monitoring pzogram of both s[ruc- tures and monuments will continue until cessation is approved by the Division, in writing. (ii) For the location of monuments, see Maps 3-1 and 3-2, h`.ap 3-2 depicts monuments installed at present. (d) Ci) Although sit=_ specific subsidence data inclu- sive of draw angle, subsidence factor, and measured subsidence nrofiles will not be available until mid-1955, several observations supporting the predicted nature and character of subsidence at the Orchard Valley "fine have been obtained from the widely spaced monitor- ing network, It should be emphasized again . that C,.~I will not be undermining any structure or Renewable Resource Land in the initial per- - mit term. First, subsidence manifestations over develop- ment workings is undetectable under 4 present survey accuracy (+ 0,1 ft, vent,). *'onitor- ing stations 17, 18, and 12 have displayed negligible r:.ovement since eevelopment under- minin~ orer [forth iI, 8 East, and 8E-8h', ._- spettively (refer to A`.ap 3-1). Second, the e.`fec[s of total recovery are rel- atively quick and of short duration, Monitor- ing stations 9, 10, and 16 were emplaced and surveyed after total extraction in panels 4 East, 5 East, and 3 West, respectively, and have not undergone additional subsidence. Monitoring station 11, which overlies the rib- side of the SE-2S panel has followed several subsidence predictions. Initially surveyed on Revised 08/01/84 Revised 12/26(84 Revised 1OJ61/87 Revised 11/11/88 149