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SENECA COAL COMPANY <br />SSNECA II-W MINE, PERMIT C-82-057 <br />T-2 STOCRTANR AS-BUILT REPORT <br />The T-2 stocktank was constructed in the fall of 1996. It is <br />located at the outlet of HRC-A3, in the NWyeSW~ of Section 22, <br />Township 5 North, Range 88 west. The location of T-2 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 6, 1996. This survey <br />generated the following statistics for stocktank T-2. <br />Bottom of Pond Elevation - 7286.5 <br />Spillway Elevation - 7292.8 <br />Average Spillway Width - 21.7 feet <br />Top of Embankment Elevation - 7293.4 <br />Average Top of Embankment Width - 10.3 feet <br />Upstream Embankment Slope - 3.3H:1V <br />Downstream Embankment Slope - 2.3H:1v <br />Basin Elevation-Staae-Area-Caoacity Table <br />ELEVATION STAGE AREA CAPACITY DESCRIPTION <br />(FT.-MSL) (FEET) (ACRES) (ACRE-FEET) <br />7286.5 0.00 0.00 0.00 BOTTOM OF POND <br />7288.0 1.50 0.05 0.02 <br />7290.0 3.50 0.08 0.15 <br />7292.0 5.50 0.13 0.36 <br />7292.8 6.30 0.15 0.47 SPILLWAY <br />7293.4 6.90 0.17 0.56 TOP OF EMBANKMENT <br /> <br />y ~.3' <br /> <br />To the best of my knowledge and belief, based upon my professional <br />expertise, and to the extent possible, stocktank T-2 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-2 stocktank as-built certification report. <br />JAN 31 1997 <br />Michhel G. ,C~Fvilla`%~`o Date <br />Colorado P E:~28 y'. <br />