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Review Checklist for Subsidence Monitoring Report <br />Mine: West Elk Mine Date this review was completed: 7/22/10 <br />Permit No.: C-80-007 CDRMS reviewer: Tom Kaldenbach <br />Report period: Fall 2009, and quarterly summary reports Q4-08, Q1-09, Q4-09, and Q1-10 <br /> <br />Monitoring requirement Regulation/per <br />mit citation In <br />compliance: <br />Comment <br /> Yes/ no ? <br /> Prior to 2000, West Elk monitored subsidence in a monument grid <br /> installed over their first three longwall panels. This monitoring verified <br /> their subsidence predictions. From 2000 through Spring 2007, West Elk <br /> conducted an annual visual inspection of recently undermined areas and <br /> previously identified subsidence features. The frequency of this visual <br /> inspection was increased to semi-annually beginning in Fall 2007. The <br />Installed and surveyed monuments prior to 2.05.6(6)(c)( Yes only structures undermined since the previous subsidence report (Spring <br />undermining. i)(A) 2009) were USFS roads and stock ponds over Panel E-1. <br /> Sections 2.05.6(6)(b)(ii), (6)(c)(i), and (6)(e)(iii)of the permit application <br /> describe West Elk's subsidence monitoring plan. The plan is consistent <br /> with the existing level of need for verifying the subsidence prediction, as <br /> required b 2.05.6 c i F . <br />Located monuments to detect vertical subsidence and 2.05.6(6)I(i) Yes <br />horizontal displacement. B) <br />Monitored each structure's orientation, location, 2.05.6(6)I(i) Yes <br />elevation. I <br />Monitored each monument and structure at least 2.05.6(6)I(i) Yes <br />quarterly, D <br />Commenced monitoring of each monument and 2.05.6(6)I(i) Yes <br />structure at least one month prior to undermining. D <br /> The operator submitted summary reports for those calendar quarters in <br /> 2.05.6(6)I(i) which a semi-annual report was not prepared. The summary reports <br />Submitted monitoring report at least semiannually. (E) Yes fulfilled the requirement in the permit application that requires these <br /> reports. <br />Conducted GPS baseline and postmining surveys in <br />either panel E-1 or E-2 for verifiying the predicted Permit Yes <br />angle of draw for E-Seam mining, sections <br />Inspected ground before and after mining. 2.05.6(6)(b) Yes <br />Evaluated structures of concern, e.g.: Dry Fork and its (ii), <br />thalweg, roads, well casings, culvert inverts, flumes, (6)(c)(i), Yes <br />monuments at stock ponds, and buildings. and <br />Visually surveyed subsidence features. (6)(e)(iii) Yes <br />Aerial or other photos of areas prior to, during, and Yes