Laserfiche WebLink
DAM NAME: San Luis Tailing Dam DATE OF REPORT:August 5,2022 <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 <br /> good appearance,and conditions observed in surfaces may be irregular,eroded,rutted, safety of 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 <br /> unexplained increase in flows from designed drain outfalls,or other designed drams.No of the 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 orseepageflows contain sediment,i.e.,muddy <br /> dam. wateror particles i nJarsamples. <br /> 3) Widespread seepage,concentrated seepage,orponding <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 <br /> leakage measurements,and piezometer leakage measurements.Instrumentation is "ACCEPTABLE"here are not provided,or required periodic <br /> readings.Instrumentation is in reliable, in serviceable condition.A plan for readings are not being made,or unexplained changes in <br /> working condition.A plan for monitoring the monitoring instrumentation is in effect by readings are not reacted to by Owner. <br /> instrumentation and analyzing results by the owner.Periodic inspections by Owner or <br /> owner's engineer is in effect.Periodic representative. <br /> inspections by Owner's engineer. <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. <br /> maintenance and repair,and only a few some maintenance items need to be One or more items needing maintenance or repair has <br /> minor items may need to be addressed. addressed No major repairs are required. begun to threaten 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 <br /> conditions that appear to threaten the symptoms of structural distress structural distress(excessive seepage,cracks,slides, <br /> safety of the dam,and the dam is (seepage,evidence of minor sinkholes,severe deterioration,etc.),which could <br /> expected to perform satisfactorily under displacements,etc.)which,if conditions lead to the failure of the dam if the reservoir is used <br /> all design loading conditions. Most of worsen,could lead to the failure of the to full capacity. The dam is judged unsafe for full <br /> the required monitoring is being dam.Essential monitoring,inspection, storage of water. <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 />