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DAM NAME: San Luis Tailing Dam DATE OF REPORT: 06 21 16 <br /> GUIDELINES FOR DETERMINING CONDITIONS <br /> CONDITIONS OBSERVED-APPLIES TO UPSTREAM SLOPE,CREST,DOWNSTREAM SLOPE <br /> GOOD ACCEPTABLE POOR <br /> In general,this part of the structure has a Although general cross-section is maintained, Conditions observed in this area appear to threaten the safety of <br /> good appearance,and conditions observed in surfaces may be irregular,eroded,rutted, the dam. <br /> this area do not appear to threaten the safety spalled,or otherwise not in new condition. <br /> of the dam. Conditions in this area do not currently <br /> appear to threaten the safety of the dam. <br /> CONDITIONS OBSERVED-APPLIES TO SEEPAGE <br /> GOOD ACCEPTABLE POOR <br /> No evidence of uncontrolled seepage. No Some seepage exists at areas other than the Seepage conditions observed appear to threaten the safety of the <br /> unexplained increase in flows from designed drain outfalls,or other designed drains. No dam. Examples: <br /> drains. All seepage is clear. Seepage unexplained increase in seepage. All seepage 1)Designed drain or seepage flows have increased without <br /> conditions did not appear to threaten the is clear. Seepage conditions observed do not increases in pool level. <br /> safety of the dam. currently appear to threaten the safety of the 2)Drain or seepage flows contain sediment,i.e.,muddy water or <br /> dam. particles in jar samples. <br /> 3) Widespread seepage,concentrated seepage,or ponding <br /> appears to threaten the safety of the dam. <br /> CONDITIONS OBSERVED-APPUES TO MONITORING <br /> GOOD ACCEPTABLE POOR <br /> Monitoring includes movement surveys, Monitoring includes movement surveys and Instrumentation and monitoring described under"ACCEPTABLE" <br /> leakage measurements,and piezometer leakage measurements. Instrumentation is in here are not provided,or required periodic readings are not being <br /> readings. Instrumentation is in reliable, serviceable condition. A plan for monitoring made,or unexplained changes in readings are not reacted to by <br /> working condition. A plan for monitoring the instrumentation is in effect by owner. Owner. <br /> instrumentation and analyzing results by the Periodic inspections by Owner or <br /> owner's engineer is in effect. Periodic representative. <br /> CONDITIONS OBSERVED-APPLIES TO MAINTENANCE AND REPAIR <br /> GOOD ACCEPTABLE POOR <br /> Dam appears to receive effective on-going Dam appears to receive maintenance,but Dam does not appear to receive adequate maintenance. One or <br /> maintenance and repair,and only a few some maintenance items need to be more items needing maintenance or repair has begun to threaten <br /> minor items may need to be addressed. addressed. No major repairs are required. the safety of the dam. <br /> OVERALL CONDITIONS <br /> SATISFACTORY CONDITIONALLY SATISFACTORY UNSATISFACTORY <br /> The safety inspection indicates no The safety inspection indicates The safety inspection indicates definite signs of structural <br /> conditions that appear to threaten the symptoms of structural distress distress(excessive seepage,cracks,slides,sinkholes, <br /> safety of the dam,and the dam is (seepage,evidence of minor severe deterioration,etc.),which could lead to the failure <br /> expected to perform satisfactorily under displacements,etc.)which,if conditions ofthe dam if the reservoir is used to full capacity. The dam <br /> all design loading conditions. Most of worsen,could lead to the failure of the is judged unsafe for full storage of water. <br /> the required monitoring is being dam. Essential monitoring,inspection, <br /> performed. and maintenance must be performed as <br /> a requirement for continued full storage <br /> in the impoundment area. <br /> Page 4 of 4 <br />