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1, 1989 were temperature corrected to 25° C. The formula for correcting <br />non - corrected conductivity data may be found in the 1990 through 1992 <br />AHRs. <br />Peabody instituted in 1995 a new monitoring site numbering system for <br />its new ParadoxT" water quality database. This revised system is <br />detailed in Table A. For convenience sake, this table has been placed at <br />the end of the Table of Contents (see previous page). In addition, Table <br />3, Summary of Ground Water Monitoring Wells; Table 8, Summary of Surface <br />Water Monitoring Sites; and the Table of Contents of Appendices B <br />through D have all been revised to correlate the old site (and map) name <br />to the new (Paradox) computer name. The revised computer name will be <br />used throughout the following text. <br />In the 2013 water year PSCM completed an extensive, enhanced monitoring <br />effort to determine the sources of selenium in mine discharges, as well <br />as within the region generally. Monitoring consisted of sampling <br />conducted at the outfalls, at stream monitoring locations, spoil <br />springs, spoil wells, and natural springs. In addition, biological <br />monitoring at multiple sites was initiated in the spring of 2012, and <br />continued into the fall of 2012. Further seasonal biological surveys <br />were completed during 2013. These surveys included sampling of fish and <br />invertebrate populations, habitat quality, and tissue sampling for <br />selenium. <br />PSCM is in the process of evaluating the data collected and working with <br />CDRMS to create new site specific sampling plans. This AHR will only <br />discuss data from those sites that are required in the CDRMS permit. <br />The monitoring data collected is currently being assessed to better <br />understand the source and fate of selenium in order to evaluate <br />potential treatment options and techniques and to implement operational <br />modifications in order to produce effluent that meets CPDS effluent <br />limitations and does not result in non - attainment of the applicable <br />selenium standard in the respective receiving streams. <br />16 <br />