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In summary, maintenance-related recommendations include: <br /> ' 1. Continue to maintain the surface erosion control measures (cross berms and rock-lined down <br /> drains) in the repaired area at the right downstream slope of the dam. <br /> 2. Monitor the disturbed areas around the South Diversion Ditch Drop Structure for signs of <br /> Ierosion. It may be necessary to re-seed and install erosion control measures on the steeper <br /> slopes in those areas if erosion becomes problematic. <br /> 3. Clean the underdrain pipes by jetting to remove accumulated sediment and precipitate buildup. <br /> Conduct a camera inspection after cleaning to evaluate the condition of accessible lengths of <br /> the pipes. <br /> 4. Modify the grading in the lower right groin area to direct surface runoff away from the <br /> downstream toe and to reduce erosion, sediment transport and accumulation of sediment at the <br /> toe of the dam which builds up around the under-drain pipe outlets. <br /> 5. Consider installing a toe drain collection well(manhole), such as the concept shown on Figure <br /> 4 to facilitate monitoring and maintenance of the toe drains. <br /> ' The overall condition of the dam is Satisfactory. Please feel free to contact me if you have any <br /> questions regarding this report. <br /> Regards, <br /> Debora J. Miller,Ph.D., P.E. <br /> MILLER GEOTECHNICAL CONSULTANTS, INC. <br /> 1 <br /> 1 <br /> 1 8 <br /> 2020 Dam Safety Inspection Report San Luis Tailings Dam <br />