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The proposed subsi~lcnce report fotm.~~ appcnrs`airly cnmp7e[e. However, in <br />order to facilitate data reduction :•n~: Snterpretation, [he company should <br />include the following items in each *~•pnr[ submitted; <br />• (1) The company should prepare graphic cross-sections along the subsidence <br />monument section lines above the toss panel, in order to assist in <br />l;raphically depicting progressive surface subsidence. I have attached <br />an example of such a cross-sec [ion fer [heir reference. Subsequent results <br />should be depicted on the same cross-section using different s}^rbols. <br />This should allow comparison of progressive subsidence occurrence. <br />(2) The company should include a map of the taor}sings within the potential <br />angle of draw and immediately adjaccn; areas of [ire mine. This map should <br />be updated with each data collection, in order to allow determination of the <br />angle of draw. Hopefully, this will allow comnarison of working boundaries <br />with exact surface response. The m:p should also indicate the location of <br />subsidence monuments on the surface shove the panel. <br />(3} The °monitoring station" data sheet should be amended to include horizontal <br />change columns for both the northerly and easterly coordinates. I e>:pect <br />both horizontal subsidence displacement and vertical movement in response to <br />undermining. <br />(4) The company should observe and record any inflow of water into the mine <br />workings within the area of the test Hanel and adjacent wor}sing areas. Reference <br />is contained with Stipulation No. 5, quoted above, to monitoring of any <br />mine inflow. Collection of this inflow data could potentially allow correlation <br />with any observed effects to springs and seeps or to the observation well »a ter <br />• levels above panel 8 east, 5 north. <br />(5) During the surveying of the subsidence monument network, the operator should <br />visually inspect the ground surface above the test panel and adjacent areas, <br />in order to determine what subsidence phenomena, if any, are occurring. A <br />record of any observed subsidence phenomena, such as ground cracking or <br />compresional heaving, should be made and the location of any observed features <br />should be indicated upon a map included in the report. The reap mentioned <br />in (2) above, if not to complicated, could also be utilized for this purpose. <br />In completing the subsidence monitoring reports, CWI should prepare a summary <br />of the implications of the data collected during the previous period. The <br />operator should attempt to correlate ~bsen•ations concerning physical <br />subsidence mov cmen[s with observa[i~ns concerning surface subsidence <br />phenomena, surface and ground water h.,drology, and nine inflow. Each <br />subsequent report should briefly sum.~.arize the applicant's understanding <br />of subsidence at the Orchard Valley mine site. Particular e:rphasis should <br />be placed u; on an}' observations which suggest variation from the applicants <br />original subsidence projections, included within the pern~iC documents in <br />response to the reouirts,ents of Rule '_.05.6(6). <br />yep <br />l At;ac',c,ent <br />J <br />• cc: I). Shelton <br />E. Bischoff <br /> <br /> <br />