Laserfiche WebLink
I~ <br />TAB 15 <br />HYDROLOGIC MONITORING PROGRAM <br />Introduction <br />A ground and surface water monitoring program has been developed to evaluate and assess the <br />existing ground and surface water system at the Seneca II-W Mine. Monitoring at Seneca II-W <br />provides two important aspects of hydrologic data that are essential in determining changes to the <br />environment caused by a coal mine operation. First, the program provides premining baseline data <br />for comparison to data collected at a future time, and second, monitoring provides during and after <br />mining data for the determination of potential mining-induced impacts, Monitoring data collected <br />during and following mining is used: 1) to evaluate the accuracy of impacts predicted in Tab 17, <br />Probable Hydrologic Consequences; 2)to determine when certain monitors may be discontinued or <br />added where they are needed (e.g., spoil wells); and 3) to determine when the frequency, number, <br />and type of parameters monitored in the program may be changed. Monitoring data are collected and <br />analyzed following standard procedures described in published literature produced by Federal <br />agencies such as the U.S. Geological Survey and the U.S. Environmental Protection Agency. <br />Surface Water Monitoring <br />Surface Water Monitoring Site Numbering System. An example of the format used to identify surface <br />water sites is "SW-S2W-SG3". The "SW" prefix indicates surface water; the "S2W" refers to the <br />Seneca II-W Mine; the "SG" means stream site with no instrumentation ("FG" =flume gage and "C G" <br />=crest stage gage); and the number "3" refers to the site number. For the sake of brevity in the <br />following text, the SW-S2W prefixes are usually omitted. Thus, for example, Sile SW-S2W-SG3 is <br />referred to as simply "Site SG3". Information on the updated naming scheme is provided in Tab 7 <br />(preface) and updated Appendices and Exhibits. <br />Surface Water Monitoring Site Description. Surface water sites with a SG prefix are not instrumented <br />and are marked by metal fence posts on the stream bank. Flow monitoring procedures vary with the <br />amount of Flow. During low flow, flow is measured with a bucket and stopwatch (O=8&S), or a <br />portable cutthroat flume at a small drop in the stream channel. High flows at both sites are computed <br />using measurements of the stream cross section and values of the stream velocities measured <br />with <br />1 <br />Revised 9/98 <br />