Laserfiche WebLink
REVISED MONITORING PROGRAM (2016 TR-11) <br /> The current (2005-2016) monitoring program consists of spring and fall full- <br /> suite water quality sampling of upstream and downstream surface and ground <br /> water sites. In addition, National Pollutant Discharge Elimination System <br /> (NPDES) monitoring occurs at two outfalls. The tipple area was fully <br /> reclaimed in 2011. The office area was fully reclaimed in 2013. Vegetation is <br /> coming back very well. Only the rail track remains. <br /> Since the tipple and office areas are fully reclaimed, the surface and ground <br /> water quality parameter lists were revised in TRll submitted in 2016. Surface <br /> water monitoring at sites HGSD1 and HGSD3 in the spring and fall will be <br /> retained. Ground water monitoring at wells HGDAL3 and HGDAL4 will be reduced <br /> from semiannual to annual (spring) , which is consistent with the monitoring <br /> programs for the adjacent Peabody Energy closed mines, Seneca II-W and Yoast. <br /> NPDES monitoring will be continued per the NPDES permit. <br /> Data from the upstream (HGSD1) and downstream (HGSD3) surface water sites for <br /> the last five years (2011 to 2015) were compared to the receiving stream <br /> standards for lower Dry Creek (Yampa Segment 13h, Regulation No. 33, June <br /> 2014) . Parameters that exceeded the standards were total recoverable (TR) <br /> iron, nitrites, and dissolved selenium. Those parameters will be analyzed as <br /> part of the new surface water parameter list, Table 13-3. In addition, to be <br /> consistent with Colorado Department of Reclamation, Mining, and Safety <br /> (CDRMS) requirements and surface water parameter lists from adjacent mining <br /> areas, the following parameters will also be monitored: flow, temperature, <br /> conductivity, pH, manganese, total dissolved solids (TDS) and total suspended <br /> solids (TSS) . <br /> Data from upgradient (HGDAL4) and downgradient (HGDAL3) wells for the last <br /> five years (2011 to 2015) were compared to Colorado Department of Public <br /> Health and Safety (CDPHE) ground water agricultural use standards (CDPHE, <br /> Reg. 41, 2008) . Parameters that exceeded the standards were boron and <br /> manganese. According to the CDPHE, the 750 ug/l boron standard is set for <br /> sensitive crops, and that the limit otherwise is 5000 ug/l. None of these <br /> sensitive plant species are grown commercially in this area. The highest <br /> boron value from a HGT well was 920 mg/l, therefore, boron monitoring will be <br /> discontinued. Manganese monitoring will be retained. To be consistent with <br /> CDRMS requirements and ground water parameter lists from adjacent mining <br /> areas, the following parameters will also be monitored: depth to water, <br /> temperature, conductivity, pH, iron and total dissolved solids (TDS) . All <br /> parameters will be analyzed as part of the new ground water parameter list, <br /> Table 13-4 . <br /> TR-11 13 Revised 07/16 <br />