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DAM NAME: San Luis Tailing Dam DATE OF REPORT: 06 04 19 <br /> TAILING DAM INSPECTION FORM <br /> ITEMS REQUIRING ACTION BY OWNER TO IMPROVE THE SAFETY OF THE DAM <br /> MAINTENANCE • MINOR REPAIR • MONITORING <br /> ❑(1)PROVIDE ADDITIONAL EROSION PROTECTION: <br /> ❑(2)CLEAR BRUSH FROM: <br /> ❑(3)INITIATE RODENT CONTROL PROGRAM AND PROPERLY BACKFILL EXISTING HOLES: <br /> ❑(4)GRADE CREST TO A UNIFORM ELEVATION WITH DRAINAGE TO THE UPSTREAM SLOPE: <br /> 0(5)PROVIDE SURFACE DRAINAGE FOR: Modify the grading in the lower right groin area to direct surface runoff away from the <br /> downstream toe area. <br /> M(6)MONITOR: Gullies that are forming on lower downstream slope may start to undermine left groin ditch liner. Maintain as needed. <br /> M(7)OTHER: Continue to maintain right downstream slope cross-berms and riprap-lined down drains until vegetation is established. <br /> 0(8)OTHER:Completion of South Diversion Ditch Improvements(underway)will improve flood protection <br /> 0(9)OTHER: Perform letting cleanout and camera inspection of accessible lengths of underdrain pipes. <br /> ENGINEERING• EMPLOY AN ENGINEER EXPERIENCED IN DESIGN AND CONSTRUCTION OF DAMS TO: <br /> (Plans and specifications to be approved by CDRMS prior to construction.) <br /> ❑(10)PREPARE PLANS AND SPECIFICATIONS FOR REHABILITATION OF THE DAM <br /> ❑(11)PREPARE AS-BUILT DRAWINGS OF: <br /> ❑(12)PERFORM A GEOTECHNICAL INVESTIGATION TO EVALUATE THE STABILITY OF THE DAM: <br /> ❑(13)PERFORM A HYDROLOGIC STUDY TO DETERMINE REQUIRED SIZE OF FLOOD BYPASS/SPILLWAY: <br /> ❑(14)PREPARE PLANS AND SPECIFICATIONS FOR AN ADEQUATE SPILLWAY <br /> ❑(15)SET UP OR IMPROVE MONITORING SYSTEM: <br /> ❑(16)OTHER: <br /> ❑(17)OTHER: <br /> Attachments: <br /> 1)Photo Log and map(Figure 1) <br /> 2)Recent piezometer(Figure 2)and under-drainage flow rate readings(Figure 3) <br /> [A Photographs 0 Attachments <br /> ENGINEER'S INSTRUCTION: Instructed owner on the safety concerns with the structure and how to monitor and inspect the dam and <br /> appurtenant works in the interim period between the regulatory annual inspections. 0 Yes ❑ No <br /> Comment: <br /> Professional Engineer's Signature: Date: 7 1 19 <br /> Reviewed by: Date: <br /> Owner/O ner's Representative <br /> Page 3 of 4 <br />