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QUARTERLY SEDIMENTATION POND INSPECTION REPORT <br />CDMR Rule 4.05.9(17) <br />Mine: Lorencto <br />NPDES ID. No.: Pond ~9A (South) <br />Inspection Period: Third Quarter 2007 <br />Inspet~ion Dafie: 921/07 <br />General Description or Reference to Site Plan: <br />This pond is located south-east of the area of mining scheduled for 2001-02. 'The pond <br />is partially incised into bedrock and the embankment keyed into bedrock. Side slopes <br />are less than 2H:1 V. The primary. spilhnray discharges south irrto Jeff Canyon_ <br />EMBANKMENT <br />1). Adequacy of the vegetative Dover. Excellent ,~ode~ Few Poor <br />2). Erosion forming Gullies: Extensive Some einr` None <br />3). Is wave action causing erosion: <br />On the Upstream embankment? Yes No ~" <br />At the principal spillway inlet? Yes No ~-- <br />4). Erosion of the downstream toe of the embankment? Yes No ~--- <br />Cause of erosion can be attributed to: <br />5). is seepage okxurring through the dam? Yes No ~.- <br />Could this seepage cause potential instability? <br />PRINCIPAL SPILLWAY <br />1). Is the principal spiitway system in working order'? <br />2). !s the inlet free of debris and restrictive material? <br />3). Is the discharge outlet free of restrictive material? <br />4). Is erosion okxurring at the discharge outle#? <br />Evaluate the severity: Extensive Moderate <br />Yes ~-~--- No <br />Yes ~- <br />Yes L---- <br />No <br />No <br />Yes No l//`- <br />Just starting None <br />Page 1 of 2 <br />