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• -w~ 6. Discharge Structures <br />Primary - Water flow at the outflow is approximately <br />one inch in depth. Riprap at the outflow is in good <br />condition, and there is no leakage around the pipe. <br />The riser is clear of debris and water inflow is <br />through the two lowest slots in the riser. Water level <br />inside the riser is at the base of the low level <br />outlet gate. <br />Emer¢ency Spillway - Spillway in good condition, free <br />and clear of debris and there is no indication that <br />it has functioned since the first quarter inspection. <br />7. Inaut Structures - There is no water flow in the lateral <br />that enters the pond area from the south, however, the <br />small alluvial fan at its foot appears slightly larger <br />than previously reported. The principal input ditch at <br />the upstream end of the pond is in acceptable condition. <br />Although an alluvial fan has been deposited at its foot, <br />the fan has little effect on the impoundment volume of <br />the pond. <br />Exalosive Storaee Area Sedimentation Pond <br />1. Structural Weakness - None. <br />2. Erosion and Vegetation - No rills or gullies on embank- <br />ment or pond slopes. Vegetation similar to development on <br />Ponds Nos. 1&2. <br />3. Hazardous and Potentially Hazardous Conditions - None. <br />4. Sediment Level - Water level in the pond is 0.3 feet <br />above the base of the riser on the primary dewatering <br />device, and the water depth is a maximum of 3.0 feet. <br />Thus, the sediment level is 2.7 feet below the riser <br />base. <br />5. Required Maintenance - None <br />6. Discharge Structures <br />Primary - Minor flow at output end of pipe where <br />riprap is in reasonable condition. input riser is <br />clear of debris, and water is entering the pipe <br />through one-half inch holes in the base of the pipe. <br />Emergency Spillway - The riprapped spillway is in <br />good condition, and shows no evidence of water flow <br />since the first quarter 1995 inspection. <br />7. Inaut Structures - A minor flow of muddy water enters the <br />pond from the ditch that connects the pond to the <br />Northwest Sedimentation Trap. The ditch is in good condi- <br />tion, and muddy water in the pond prevents observation of <br />any alluvial fan buildup. <br />