2013-04-18_PERMIT FILE - C2009087A

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RULE 2 - PERMITS • calcium - sodium and calcium- magnesium cations, with mixed anions similar to the other sites. There is somewhat more scatter in the data at SSG1 than at the other two Grassy Creek stations. Trilinear diagrams for surface impoundments (NPDES2, NPDES3, and NPDES4) are shown on Figure 2.04.7 -F19.2 through Figure 2.04.7- F19.4. Ponds NPDES2 and NPDES4 exhibited either calcium- sodium or calcium - magnesium cations, and either chloride - sulfate or mixed (chloride-sulfate - bicarbonate) anions. NDPES4 was more often calcium- magnesium than NPDES2. NPDES3 exhibited calcium - sodium cations, and mixed (chloride- sulfate - bicarbonate) anions. For those stations with corresponding alluvial wells (SSG1, YSGF5, and SSLG5; respectively corresponding to SGAL71, YGAL15, and SLGAL32), the surface water quality characteristics only inconsistently resemble those of the corresponding alluvial well. In Little Grassy Creek, the three samples at alluvial well SLGAL32 contained slightly higher magnesium, sodium, and sulfate; and correspondingly lower calcium and bicarbonate concentrations than the three surface water samples. While the surface water, characteristics at SSG1, YSGF5, and SSLG5 are consistently calcium- sodium with high magnesium (or calcium- magnesium at YSGF5) and mixed anions, the groundwater data at the two corresponding Grassy Creek alluvial wells only have those characteristics for a few samples. The other samples, including all of those at YGAL15 and most of those at SGAL71, can be characterized as sodium - potassium bicarbonate, or sodium - potassium with mixed bicarbonate - chloride- sulfate anions. Trends in the water quality of Grassy Creek appear to result from the influence of tributaries, rather streamwise changes in geology or soil conditions. Little Grassy Creek at SSLG5, upstream of the • influence of the reclaimed Seneca II Mine, exhibits similar sulfate- bicarbonate proportions as the two upper stations on Grassy Creek (SSG1 and YSGF5), but has higher sodium/potassium. Among the Grassy Creek stations (SSG2, SSGI, and YSGF5, listed from downstream to upstream), there is no clearly dominant streamwise trend in cation composition, though SSG2 has proportionally more magnesium and less calcium than the other two stations. Likewise, SSG2 has proportionally more sulfate and less bicarbonate, and considerably higher TDS than the other two stations. The differences appear to be due to the influence of spoil water from the reclaimed Seneca II Mine entering via Little Grassy Creek, which enters Grassy Creek between SSGI and SSG2. The discharge from Pond 002, on Little Grassy Creek downstream of the Seneca II Mine, is high in both TDS and sulfate, as discussed above. • PSCM Permit App. 2.04 -77 Revision 12/17/09