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0 RULE 2.04.7 <br />HYDROLOGY DESCRIPTION AND MONITORING PLAN <br />INTRODUCTION <br />In 2010, the Seneca II Mine permit boundary was significantly reduced. The new permit area now <br />includes only the Sediment Pond 008 basin. The following subjects are addressed: <br />- Potential Hydrologic Consequences <br />- Water Rights <br />- Alternative Water Supply <br />- Monitoring Plan <br />- Ground Water Points of Compliance <br />Reference is made to background/backup information in Tab 7 in the original PAP. <br />POTENTIAL HYDROLOGIC CONSEQUENCES <br />The probable surface water impacts of the Pond 008 basin are addressed in the Tab 7 beginning on <br />page 7 -247, and conclude on page 7 -254. On these pages, this basin is referred to as Bond Creek. <br />References to NPDES 007 are to a small reclaimed sediment pond that existed in the Pond 008 <br />basin. The most important prediction in this section is on page 7 -247, 1" paragraph, where it states: <br />"The result on this analysis, presented in Table 7 -73, show that in June, the TDS (total dissolved <br />solids) concentration of Fish Creek increases 76 mg/1, from 421 mg/1 at site 26 (now replaced by site <br />SW- S2 -11, a.k.a. SSF11) to 497 mg/1 (18% increase) below Bond Creek (at site SW- S2 -13, a.k.a. <br />SSF13). Similarly, in July, the TDS concentration of Fish Creek increases 74 xng/l, from 533 mg/1 at <br />site 26 to 607 mg/1(14% increase) below Bond Creek." <br />The items in parenthesis in the statement above were added now to provide clarity. Monitoring data <br />from 1987 to 2009 indicates that in May, the average TDS at site SSF11 was 296 mg/l, and was 322 <br />mg/1 at site SSF13, for an increase of 28 mg/1 (9% increase). In June, the average TDS at site <br />SSF11 was 485 mg/l, and was 510 mg/1 at site SSF13, for an increase of 25 mg/1 (5% increase). In <br />July, the average TDS at site SSFI 1 was 605 mg/l, and was 595 mg/l at site SSF13, fora decrease of <br />10 mg/1(2% decrease)! <br />These monitoring data indicate that Pond 008 (together with Pond 004, formerly with the Seneca II <br />Mine, now part of the Peabody Sage Creek Mine) have very little impact on the water quality of <br />Fish Creek. The monitoring data also indicates that impacts are below PHC predictions, and <br />therefore, the PHC need not be revised. <br />Impacts to the ground water system are discussed in below in the Ground Water Points of <br />Compliance section. <br />WATER RIGHTS <br />Water rights are discussed in Tab 7 beginning on page 7 -143. No water rights were identified in the <br />Pond 008 basin at that time. In the Permit Application Package for the Peabody Sage Creek Mine <br />(approved in 2010), water rights were again researched and discussed, beginning on page 2.04 -99. <br />PR -02 2.04.7 -1 6/10 <br />