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} <br />~Ya ge ? <br />~• Carol Pahlkc~ <br />Uctohcr ?, 1986 <br />rib thicknesses by increments of 2" until a stable thickness is determined. <br />3. The applicant's consultant should observe and report to the Division <br />the results of the experimental program. <br />~. As recommended i~ the Bureau of Mine's report, we should require the <br />applicant, durin.7 their proposed experimental program to determine rib <br />thickness, to carefully monitor the condition of the ribs with time. <br />Particu.Lar concern should be focused upon any ~;~idence or rib coal cracking <br />c_ sroili::g. Tn order to srnitor *h~r -ib condition, the initial auger <br />holes will have to remain unbackfilled for several weeks. This should <br />not, however, offend the thirty day prohibition included in Colorado <br />permanent regulatory section 4.23(4J. Furthermore, the applicant should <br />;mnitor, vi.a appropriatelu placed survey cross sections, tl~e slope <br />stability above the highwall within initial angering sections of the <br />pit. <br />5, rt should Le sti.oulated that prior to bond release the areas above the <br />highwall overlying auyering Loxes will be re-inspected to discern subsi?ante <br />effects. The applicant should Le respons-Lle for correcting any suba Bence <br />impoundments or other materially detrimental subsidence effects welch <br />occur, prior to bond release. <br />Ji m <br />/k <br />encl. <br />~'J <br />i <br />i <br />1 <br />1 <br />.~ 3 G <br />