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' DAM NAME: San Luis Tailing Dam DATE OF REPORT: 08 25 20 <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 good Although general cross-section is Conditions observed in this area appear to threaten the safety of <br /> appearance,and conditions observed in this maintained,surfaces may be irregular, the dam. <br /> area do not appear to threaten the safety of eroded,rutted,spalled,or otherwise not in <br /> ' the dam. new condition. Conditions in this area do <br /> not currently appear to threaten the safety <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 <br /> unexplained increase in flows from designed drain outfalls,or other designed drains. No the dam. Examples: <br /> drains. All seepage is clear. Seepage unexplained increase in seepage. All 1)Designed drain or seepage flows have increased without <br /> ' conditions did not appear to threaten the seepage is clear. Seepage conditions increases in pool level. <br /> safety of the dam. observed do not currently appear to 2)Drain or seepage flows contain sediment,i.e.,muddy water or <br /> threaten the safety of the 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-APPLIES 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 here are not provided,or required periodic readings are not <br /> readings. Instrumentation is in reliable, in serviceable condition. A plan for being made,or unexplained changes in readings are not reacted <br /> working condition. A plan for monitoring the monitoring instrumentation is in effect by to by Owner. <br /> 1 instrumentation and analyzing results by the owner. 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 minor some maintenance items need to be more items needing maintenance or repair has begun to threaten <br /> 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 ofthe dam if the reservoir is used to full capacity. The <br /> ' all design loading conditions. Most of the conditions worsen,could lead to the dam is judged unsafe for full storage of water. <br /> required monitoring is being performed. failure of the dam. Essential <br /> monitoring,inspection,and <br /> maintenance must be performed as a <br /> requirement for continued full storage <br /> in the impoundment area. <br /> i <br /> t <br /> ' Page 4 of 4 <br />