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Peabody Sage Creek Mine <br />SL -3 Phase III Bond Release Request <br />July 2014 <br />http : / /www.mullalgineering.com.au /images /product /file /Problem of Hydrogen Sulphide <br />in Sewers.pdf(Refer to page 5, Table 1 on the website document). The results of those <br />calculations are presented in Tables 7 and 10. No sites exceeded the sulfide standard (0.002 mg /1) <br />in the past three years. The analytical method detects both dissolved sulfides and acid - soluble <br />metallic sulfides present in suspended matter. It is suspected that a large portion of any sulfides <br />detected is of the latter type, which would bias towards higher un- ionized results. Any dissolved <br />sulfides present in surface water should eventually oxidize to sulfates. <br />The aquatic life ammonia standard is dependent on pH and temperature. The detection limit for <br />ammonia is 0.05 mg /1. All values above the detection limit are compared to table standards, page <br />87, found on this website: http: / /www.el2a.gov /waterscience /criteria /ammonia /99ul2date.pdf. <br />No sites exceeded the ammonia standard in the past three years. <br />The drinking water standard for mercury is 2 ug /1. The aquatic life standard for mercury is 0.01 <br />ug /l which is set to protect the average human consumer of fish. PSCM's lab uses a method with <br />a detection limit of 0.2 ug /1. None of the stream samples collected in the past three years were <br />above the detection limit. During the last NPDES permit renewal, the CDPHE performed a <br />reasonable potential analysis on Outfalls 002 (NPDES2) and 004 (NPDES4), and determined <br />that there was no reasonable potential for these outfalls to exceed the mercury limit; therefore, <br />mercury monitoring is no longer required at these outfalls. <br />Table 11 provides a statistical summary of the water quality for the years 2011 to 2013 for Spoil <br />Springs 1, 2, 3, 4, 6 and 6A (SSSPGI, etc.). Spoil Springs 1 and 2 flow into the NPDES 004 <br />Pond, and Spoil Springs 3, 4, 6 and 6A flow into the NPDES 002 Pond. Table 12 provides a <br />comparison of those data with the CWQCC surface water agricultural standards (Reg. 31) <br />presented in Table 13. Comparisons of water quality data collected at Spoil Springs 1, 2, 3, 4, 6 <br />and 6A were compared to the agricultural standards because the post - mining land uses of the <br />reclaimed parcel in this Phase III bond release application as designated in the Seneca II and <br />PSCM Mines' Permit Application Package for the State Mining Permit are livestock grazing and <br />wildlife habitat. Table 12 is of the same format previously discussed for Table 10. <br />29 <br />