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• • Mr. Vern Pfannenstiel - 2 - April 24, 1986 In late June, the "004 Spring" should be sampled for full suite ground water quality parameters. Surface Water 1. The map which identifies surface water stations (Exhibit 7-2) was difficult to read on first inspection. All of the many ground water stations and potentiometric surface lines are presented on this plate as well. Because this is a black line enlargement of a section of a USGS quad, the streams were difficult to locate and names of some were missing. Station SW-S2-1 did not appear to be located on Grassy Creek as identified. The outflow channel from NPDES Pond 002 to Little Grassy Creek was not shown. These details could be shown more clearly on Exhibit 7-2. It is suggested that a map showing only the surface water system and permit boundary be included in future AHR'S. 2. It is recommended by the Division that, whenever possible, same day monitoring be done on individual streams, i.e. SW-52-5, SW-S2-I,NPDES 002, NPDES 003, and SW-S2-2 should be monitored during a single day. This would be very beneficial for comparative analyses of data. 3. The daily flow tables could be improved by also calculating an annual mean flow (in cfs) and an annual summation of flow volume (in acre-feet). This would supplement reporting of flow conditions year-to-year ir~quantitative terms and assist in the narrative discussion in the AHR. In addition, a symbol placed on the hydrographs which denotes water quality sampling dates would assist in the interpretation of water quality relating to flow conditions. 4. Page 7-77 of the Seneca II permit application states: "It is expected that as more flow data becomes available, verification of the (HYMO) model will be possible". PCC should update the model with the flow data obtained through the continuing monitoring program. 5. A cadmium concentration of 8 ug/1 is reported at surface water station SW-S2-6. This high concentration of cadmium exceeds the receiving stream standards of 1 ug/1. Furthermore, dissolved manganese exceedance is similarly as large. Peabody should discuss the sources and processes involved which may explain these high concentrations. If these exceedances continue, discussion is warranted in future AHR's. 6. On page 34 of the AHR, salinity is listed under the water-quality variable monitored at the NPDES discharges. A review of Appendix F shows that specific conductance (electrical conductivity) is being monitored. As a lab determination of "salinity" does exist (Method 209, APHA, 1975), the use of the term salinity should be omitted to avoid any confusion of terms. 7. A comparison of electrical conductivity (EC) values reported from field measurements and lab determinations shows considerable differences between the two.