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FEB 04 '97 12~41PM PEABODY WSTN SENECA MIS p,3 <br />SENECA COAL COMPANY <br />98NECA II-W MINE, PBRMIT C-8Z-057 <br />T-3 STOCSTANB AS•BUILT REPORT <br />The T-3 stocktank was constructed in the fall of 1996. It is <br />located at the outlet of HRD-A5, in the NW~ySE); of Section 22, <br />Township 5 North, Range 88 west. The location of T-3 stocktank is <br />shown on Exhibit 13-2, Surface Hydrology Map. All of the stocktanks <br />at the Seneca II-w Mine will be constructed following the <br />guidelines contained in Attachment 13-1i. An as-built survey of <br />this structure was conducted on October 6, 1996. This survey <br />generated the followlnq statistics for stocktank T-3. <br />Bottom o£ Pond Elevation - 7402.2 <br />spillway Elevation - 7406.9 <br />Average Spillway Width - 16.0 feet <br />Top of Embankment Elevation - 7410.9 <br />Average Top of Embankment width - 10.3 feet <br />upstream Embankment Slope - 4.3H:iV <br />Downstream Embankment Slope - 2.9H:1V <br />Hsain Elevation-Stag -Ar a- a a + Table <br />ELEVATION STAGE AREA CAPACITY DESCRIPTION <br />(FT.-MSL) (FEET) (ACRES) (ACRE-FEET) <br />7402.2 0.00 0.00 0.00 BOTTOM OF POND <br />7404.0 1.80 0.03 0.02 <br />7406.0 3.80 0.06 0.11 <br />7406.9 4.70 0.08 0.17 ' SPILLWAY <br />7408.0 5.80 0.11 0.27 <br />7410.0 7,80 0.17 0.55 <br />7410.9 8.70 0.19 0.71 TOP OF EMBANIddENT <br />To the best of my knowledge and belief, based upon my professional <br />expertise, and to the extent possible, stocktank T-3 at the Seneca <br />II-w mine was constructed in accordance with prudent state-of-the- <br />art earthen embankment construction. Further, the structure was <br />constructed in compliance with the approved guidelines as specified <br />in Attachment 13-11 of Seneca Coal Company's approved mine permit. <br />Seneca will inspect the stocktank quarterly to evaluate structural <br />integrity, storage capacity conditions, and remedial work <br />requirements. Therefore, pursuant to Rule 4.05.6(10), the above is <br />the T-3 stocktank as-built certification report. <br />JAN 3 0 1991 <br />Michael ~rlte2r~~1 Date <br />Coloraflo YS. 28455 ;.¢ <br />