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SCC's NPDES permit expires on May 31, 1997. A permit [enewal was submitted to the Colorado Depar_ment of Health on November 27, 1996. When SCC receives the new NFDES • permr[, a copy will b= sent to [he CDMG to be included in Appendix 7-5. Hlsto ric water quality statistical summaries are provided for all natural and spoils springs, to be followed by irdi vidual analyses and milliequivalen.t reports. In addit!or., a TDS LOWESS plot rs provided for Spoils Spring M1 (the largest and most frequently mor.iiored spoils spring at Seneca II). 4. Surface Water Elow Hyd rographs Surface water flow pia to is provided along with water quality data discussed in the previous section. Ir. addition, surface xater flow hyd rographs for all stream and NPDES sites are pros er~t ed in Appendix 7-4B. 5. Pr ecipitatron Data Precipitation data is provided on Table 7-109. This table indicates the annual (by water year) total at the NOAA's Hayden Station, the departure from normal at that site, and the • precipitation as measured at the Seneca II precipitation gage. C. Probable Hyd nologic Consequences _. intrudLCt!On As i scussed in the Probable Hyc rc_ogic =onsequences (FY.C) presented dur ng the 1986 Pe rmlt Renewal (Section VILA), portions cf the oricinal PHC submitted in 1980 (Section ' II1) can no longer be considered valid. The 1986 PHC updated and modified many of the co..^.clusions made in the i9E0 FHC. Addittc nal ir.fcrmation in regards to the PHC was pro': _d ed during one '_592 Permit Renewa_ (Ser.: on VIII.S. tc E.1 Ttus i5P7 ?HC wiL limit itself to d'_scussions of total dissolved solids (TDS) trends and ' che:ni cat pa tame[ers that exceed water quality standards. Due to the fact that all Tema-Wing coal is scheduled to be removed from S eneca II by the end of 1997, additi onal modifrcat ions to the PHC are nc? necessary. Most of the conclusions made during the 1986 and 1992 PHCS still are valid. • I 7-358 Revised 02/05/97