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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 <br />the environment caused by a coal mine operation. first, the program provides premining <br />baseline data for comparison to data collected at a future time, and second, monitoring <br />provides during and after mining data for the determination of potential mining-induced <br />impacts. Monitoring data collected during and following mining is used: 11 to evaluate the <br />accuracy of impacts predicted in Tab 17, Probable Hydrologic Consequences; 21 to determine <br />when certain monitors may be discontinued or added where they are needed (e.g., spoil wellsl; <br />and 31 to determine when the frequency, number, and type of parameters monitored in the <br />program may be changed. Monitoring data are collected and analyzed following standard <br />procedures described in published literature produced by Federal agencies such as the U.S. <br />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 <br />surface water sites is "SW-S2W-SG3". The "SW" prefix indicates surface water; the "S2W" <br />refers to the Seneca II-W Mine; the "SG" means stream site with no instrumentation 1"FG" _ <br />flume gage and "CG" =crest stage Bagel; and the number "3" refers to the site number. For <br />the sake of brevity in the following text, the SW-S2W prefixes are usually omitted. Thus, for <br />example, Site SW-S2W-SG3 is referred to as simply "Site SG3". Information on the updated <br />naming scheme is provided in Tab 7 Iprefacel and updated Appendices and Exhibits. <br />Surface Water Monitoring Site Description. Surface water sites with a SG prefix are not <br />instrumented and are marked by metal fence posts on the stream bank. Flow monitoring <br />procedures vary with the amount of flow. During low flow, flow is measured with a bucket <br />and stopwatch 10=B&SI, or a portable cutthroat flume at a small drop in the stream channel. <br />High flows at both sites are computed using measurements of the stream cross section and <br />values of the stream velocities measured with <br />• <br />1 Revised 9/98 <br />