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SENECA COAL COMPANY <br />SENECA II-W MINE, PERMIT C-82-057 <br />T-24 STOCRTANR AS-BUILT REPORT <br />The T-24 stocktank was constructed in the fall of 1996. it is <br />located near the outlet of HRC-G2, in the Swl/NE~ of Section 9, <br />Township 5 North, Range 88 west. The location of T-24 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 13-11. An as-built survey of <br />this structure was conducted on October 23, 1996. This survey <br />generated the following statistics for stocktank T-24. <br />Bottom of Pond Elevation - 6686.6 <br />Spillway Elevation - 6692.3 <br />Average Spillway Width - 14.5 feet <br />Top of Embankment Elevation - 6692.8 <br />Average Top of Embankment Width - 11.0 feet <br />Vertical Height of Dam (Upstream Toe to Spillway) - 4.3 feet <br />Upstream Embankment Slope - 3.9H:1V <br />Downstream Embankment Slope - 4.6H:1V <br />Basin Elevation-Stage-Area-Caoacity Table <br />ELEVATION STAGE AREA CAPACITY DESCRIPTION <br />(FT.-MSL) (FEET) (ACRES) (ACRE-FEET) <br />6686.6 0.00 0.00 0.00 BOTTOM OF POND <br />6688.0 1.40 0.01 0.01 <br />6689.0 2.40 0.02 0.02 <br />6690.0 3.40 0.03 0.05 <br />6691.0 4.40 0.05 0.09 <br />6692.0 5.40 0.06 0.15 <br />6692.3 5.70 0.07 0.17 SPILLWAY <br />6692.8 6.20 0.09 0.21 TOP OF EMBANKMENT <br />To the best of my knowledge and belief, based upon my professional <br />expertise, and to the extent possible, stocktank T-24 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-24 stocktank as-built certification report. <br />I~~:~~~i~HT.~'Fa~,, F E 6 2 4 1997 <br />Michael G. AL~avt4~~a <br />Colorado P `•.28455 <br />Date <br />l <br />