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/wnc 1991 Cyprur TCC • firh Crreh AVf Monitoring Program • 1 <br />1.0 INTRODUCTION <br />This report summarius monitoring recommendations for the Fish Creek Alluvial Valley Floor <br />Study. Subsidence and vegetation monitoring programs are outlined. Hydrologic monitoring <br />for the Fish Creek study area is discussed in Exhibit 14, Hydrologic Monitoring Plan. <br />2.0 SUBSIDENCE MONITORING PROGRAM <br />The proposed subsidence monitoring program is outlined below and shown on Map 1, <br />Subsidence Monitoring Plan. <br />2.1 LAYOUT <br />Survey lines will be established to monitor subsidence over Longavall Panels 5 and 6 due to both <br />Panel 5 and Panel 6 undermining. One transverse line will be established a[ 10,000E ex[ending <br />2700 feet from 500 feet north of Panel 5's tailgate to 500 feet south of Panel 7's tailgate (Survey <br />Line A-A'). Two transverse lines will be established to monitor the star profiles for Panel 5 <br />(Survey Line B-B') and Panel 6 (Survey Line C-C'). Survey line B-B' eztends approximately 1500 <br />feet from a point located 500 feet west of Panel 5's start room eazt to the [ransverse survey line. <br />Survey Line C-C' extends approximately 2400 feet from a point located 500 feet west of Panel <br />6's start room east to the transverse survey line. Monumen[s will be located at 100 feet intervals <br />along each survey line. ~ ;-o~.,.~ ~-{ ~ ~ d- ].SJ <br />uNO~g i <br />2.2 MONITORING <br />Monitoring will be carried out from one or more base stations using a total station instrument <br />which permits measurement of the coordinates (x,y, and z) of each monument to an accuracy <br />of 0.05 feet. In addition, baseline and final surveys will include a dosed level survey with a <br />closure accuracy of 0.02 feet. <br />2.3 MEASUREMENT FREnUENCY <br />Baseline data will be collected at least one month prior to starting longwall mining from each <br />star room. The frequenry of baseline and subsequent measuremenu will be az follows: <br />• Panel 5 (Survey Lines A-A' and B-B') <br />- Baseline measurements one month prior to Panel start <br />- Weekly from Panel start for two months <br />- Three months after Panel Stan <br />- At the end of Panel 5 mining, prior to the star of Panel 6 mining <br />• Panel 6 (Survey Lines A-A', B-B', and C-C') <br />- Baseline measurements one month prior [o Panel Start <br />- Weekly from Panel start for three months <br />. _ Four months after Panel start <br />Final survey at end of Panel 6 mining prior to Stan of Panel 7 mining. <br />ACZ Inc. ' P.O. Boz 7740!8 • StmmGoat Springs Colorado 80477 • (303J879d160 <br />