Laserfiche WebLink
for the parameters noted in Appendix 15-1 of the permit application package. The <br />total dissolved solids (TDS) plot provided for this site in the 2003 AHR <br />indicates an increasing trend. The PHC predicts an irrigation season average <br />TDS value of 1787 mg/1. For 2003, We observed value was 1110 mg/l. <br />FGl (Hubberson Gulch downstream of 006 Gulch confluence) is equipped with <br />a continuous flow recorder and water quality samples are obtained triannually for <br />the parameters listed in Appendix 15-1. The TDS plot in the 2003 AHR <br />indicates an increasing trend. The PHC predicts an irrigation season average <br />TDS value of 2193 mg/1 for this site, while a value of 1480 mg/1 was <br />reported in the 2003 AHR. <br />SG9, SG16 and SG17 were added to the monitoring program within PR-02. <br />SG16 and SG17 were the baseline sites for Ponds 016 and 017, respectively. <br />These sites have been replaced by Colorado Discharge Permit System (NPDES) <br />monitoring sites located at the Pond 016 and 017 outfalls. <br />Dry Creek <br />One site is monitored on Dry Creek, downstream of mining (SGS). Flow and field <br />parameters are measured monthly, and water quality samples for the parameters <br />listed in Appendix 15-1 are taken triannually. The TDS plot included in the <br />2003 AHR indicates an increasing trend. The Seneca II-W PHC predicts an <br />average irrigation season TDS value of 2451 mg/1 at this site, while a value <br />of 1825 mg/1 was observed in 2003. The ephemeral drainage tributary to Dry <br />Creek, which drains the "D" Pit reclamation area in the northern portion of <br />the original permit area, is monitored at the Pond 005 outfall NPDES site. <br />Sage Creek <br />SCC monitors one NPDES site on Sage Creek, at the Pond 009 outfall. Flow and <br />field parameters are recorded monthly upstream, and triannual samples are taken <br />for the parameters listed in Appendix 15-1. In addition, SCC monitors an <br />NPDES site at the Pond 015 outfall, located on a south tributary of Sage <br />Creek. <br />Seneca Coal Company has installed a sediment control system to divert, convey <br />and/or treat surface water runoff in and around the mine site. The sediment control <br />system includes seven sedimentation ponds (Ponds 005, 006, 009, 015, 016, 016A <br />and 017). A more complete discussion of this system is contained in Section III.C. <br />of this document. <br />Flow and water quality measurements are taken at all sedimentation ponds, in <br />accordance with the Colorado Discharge Permit System permit issued by the <br />Seneca II-w Findings Document 37 November 17, 2004 <br />Permit Revision No. 4 <br />