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FEB 04 '97 12~41PM PERHODY WSTN SENECR MINE 88NSCA COAL COMPANY $SNSCA II.9P MINB, PSRMIT C-83-057 T-3 STOCRTANR AS-BUILT RBPORT P.2 The T-2 stocktank was constructed in the fall of 1996. it is located at the outlet of HRC•A3, in the NW~i3WiG of Section 22, Township 5 North, Range 88 West. The location of T-2 stocktank is shown on Exhibit 13-2, Surface Hydrology Map. All of the stocktanks at the Seneca II-w Mine will be constructed following the guidelines contained in Attachment 13-11. An ae-built survey of this structure was conducted on October 6, 1996. This survey generated the following statistics for stocktank T-2. Bottom of Pond Elevation - 7286.5 Spillway Elevation - 7292.8 Average Spillway width - 21.7 feet Top of Embankment Elevation - 7293.4 Average Top of Embankment width 10.3 feet Upstream Embankment Slope - 3.3H:1v Downstream Embankment Slope - 2.3H:1V ELEVATION STAGE AREA CAPACITY DESCRIPTION (FT.-MSL) (FEET) (ACRES) (ACRE-FEET) 7286.5 0.00 0.00 0.00 BOTTOM OF POND 7288.0 1.50 0.05 0.02 7290.0 3.50 0.08 0.15 7292.0 5.50 0.13 0.36 7292.8 6.30 0.15 0.47 9PILLwAY 7293.4 6.90 0.17 0.56 TOP OF EMBANKMENT To the best of my knowledge and belief, based upon my professional expertise, and to the extent possible, stocktank T-2 at the Seneca II-W mine was constructed in accordance with prudent state-of-the- art earthen embankment construction. Further, the structure waa constructed in compliance with the approved guidelines ae specified in Attachment 13-11 of Seneca Coal Company~s approved mine permit. Seneca will inspect the stocktank quarterly to evaluate structural integrity, storage capacity conditions, and remedial work requirements. Therefore, pursuant to Rule 4.05.6(10), the above is the T-2 stocktank as-built certification report. JAN 31 1991 Colorado ~.~ 2a~~5 Date