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QUARTERLY SEDIMENTATION POND INSPECTION REPORT <br />CDMR Rule 4.05.9(17) <br />Mine: Lorencito <br />NPDES ID. No.: Pond #10A-Loadout <br />Inspection Period: Fourth Quarter 2007 <br />Inspection Date: 12/3/07 <br />General Description or Reference to Site Plan: <br />This pond is located east of the coal loadout facility and south of the railroad tracks <br />The pond is partially incised into alluvium and the embankment keyed into the <br />subsurtace strata. Side sopes are less than 2H:1 V. The pond discharges into Lorencito <br />Canyon Creek. <br />EMBANKMENT <br />1). Adequacy of the vegetative cover. Excellent odes Few Poor <br />2). Erosion forming Gullies: Extensive Some ew None <br />3). Is wave action causing erosion: <br />On the Upstream embankment? <br />At the principal spillway inlet? <br />4). Erosion of the downstream foe of the embankment? <br />Cause of erosion can be attributed to: <br />Yes <br />Yes <br />Yes <br />No l~ <br />No _~~ <br />No t~ <br />5). Is seepage occurring through the dam? <br />Could this seepage cause potential instability? <br />Yes ~ No l/~ <br />PRINCIPAL SPILLWAY <br />1). Is the principal spillway system in working order? Yes 1/' <br />2). is the inlet free of debris and restrictive material? Yes y <br />3). Is the discharge outlet free of restrictive material? Yes j/ <br />4), Is erosion occurring at the discharge outlet? Yes <br />Evaluate the severity: Extensive Moderate Just starting <br />No <br />No <br />No <br />No _~ <br />None <br />Page 1 of 2 <br />