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Review Checklist for Subsidence Monitoring Report <br />Mine: West Elk Mine <br />Permit No.: C-80-007 <br />Report period: Spring 2010 <br />Date this review was completed: 12/29/10 171< <br />CDRMS reviewer: Tom Kaldenbach <br /> <br />Monitoring requirement <br />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 />Installed and surveyed monuments prior to 2.05.6(6)(c)( inspection was increased to semi-annually beginning in Fall 2007. The <br />undermining. i)(A) Yes only structures undermined since the previous subsidence report (Fall <br /> 2009) was the Horse Gulch USFS road near the west end of 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 />Submitted monitoring report at least semiannually. 2.05. E6)I(i) Yes <br />Conducted GPS baseline and postmining surveys in <br />either panel E-1 or E-2 for verifiying the predicted Yes <br />angle of draw for E-Seam mining, Permit <br />Inspected ground before and after mining. sections Yes <br />Evaluated structures of concern, e.g.: Dry Fork and its 2.05.6(6)(b) <br />thalweg, roads, well casings, culvert inverts, flumes, (ii), Yes <br />monuments at stock ponds, and buildings. (6)(c)(i), <br />Visually surveyed subsidence features. and Yes <br />Aerial or other photos of areas prior to, during, and (6)(e)(iii) <br />after mining for identifying landslides, rockfalls, Yes <br />vegetation, etc.