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DAM NAME: San Luis Tailing Dam DATE OF REPORT:August 23,2021 <br /> TAILING DAM INSPECTION FORM <br /> ITEMS REQUIRING ACTION BY OWNER TO IMPROVE THE SAFETY OF THE DAM <br /> MAINTENANCE 9 MINORREPAIR 0 MONITORING <br /> ❑(1)PROVIDE ADDITIONAL EROSION PROTECTION: <br /> 1-1(2)CLEAR BRUSH FROM: <br /> O(3)INITIATE RODFNT CONTROL PROGRAM AND PROPERLY BACKFILL EXISTING HOl ES <br /> 11(4)GRADE CREST TO A UNIFORM ELEVATION WITH DRAINAGE TO THE UPSTREAM SLOPE. <br /> ❑(5)PROVIDE SURFACE DRAINAGE FOR: <br /> M (6)MONITOR: Per Item 22,continue monitoring rifling and gullying at right downstream groin. <br /> 0(7)MONITOR: Continue underdrain jetting cleanout and camera inspection of accessible lengths of underdrani pipes. <br /> N(8)MONITOR: Per Item 49,continue monitoring erosion along the side slopes of the drop structure. Erosion will likely progress in the <br /> absence of vegetation. Mitigation may require erosion repair,erosion control blankets,revegetation,and/or cutting in <br /> shallow swales along the slope to reduce runoff flow path lengths <br /> N (9)OTHER Protect toe drain area from disturbance by cattle. Fix leak in outfall pipe to prevent water ponding in this area. <br /> (10)OTHER Per 2020 inspection,consider installing a concrete structure for collection of drain discharges to facilitate access for <br /> cleanout and monitoring of the drains <br /> ENGINEERING• EMPLOY AN ENGINEER EXPERIENCED IN DESIGN AND CONSTRUCTION OF DAMS TO: <br /> (Plans and specifications to be improved by CDRMS prior to construction.) <br /> (11)PREPARE PLANS AND SPECIFICATIONS FOR REHABILITATION OF THE DAM <br /> Ll(12)PREPARE AS-BUILT DRAWINGS OF: <br /> ❑(13)PERFORM A GEOTECHNICAL INVESTIGATION TO EVALUATE THE STABILITY OF THE DAM: <br /> (14)PERFORM A HYDROLOGIC STUDY TO DETERMINE REQUIRED SIZE OF FLOOD BYPASS/SPILLWAY: <br /> ❑(15)PREPARE PLANS AND SPECIFICATIONS FOR AN ADEQUATE SPILLWAY: <br /> (16)SET UP OR IMPROVE MONITORING SYSTEM. <br /> 17(17)OTHER <br /> O(18)OTHER. <br /> Figure 1 Overall Site Plan and Photo Log <br /> Figure 2 2021 Annual Dam Safety Inspection <br /> Figure 3 Piezometer Levels <br /> Figure 4 Underdrain Flow <br /> Attachment 2 2021 Inspection Photos <br /> ® Photographs (Photos 1-21) ® Attachments (Piezometer and underdrain data) <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. P^, Yes I I No <br /> Comment: <br /> Professional Engineers Signature - Date: <br /> Reviewed by: Date: _$ /_3 <br /> Owner/Owners Representative <br /> f_449�0 Tk"_ - <br /> Page 3 of 4 <br />