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DAM NAME: San Luis Tailinq Dam DATE OF REPORT:July 5,2023 <br /> TAILING DAM INSPECTION FORM <br /> ITEMS REQUIRING ACTION BY OWNER TO IMPROVE THE SAFETY OF THE DAM <br /> MAINTENANCE • MINORREPAIR • MONITORING <br /> B(1)PROVIDE ADDITIONAL EROSION PROTECTION: Per Item 49,begin preparing plans to repair and mitigate erosional rilling. <br /> Mitigation should include cutting in shallow swales along the slope to reduce runoff <br /> flow path lengths,followed by reseeding and installation of erosion control blankets <br /> between the swales. <br /> ❑(2)CLEAR BRUSH FROM: <br /> ❑(3)INITIATE RODENT CONTROL PROGRAM AND PROPERLY BACKFILL EXISTING HOLES: T <br /> ❑(4)GRADE CREST TO A UNIFORM ELEVATION WITH DRAINAGE TO THE UPSTREAM SLOPE: <br /> ❑(5)PROVIDE SURFACE DRAINAGE FOR: <br /> O(6)MONITOR: <br /> N(7)MONITOR: Continue underdrain jetting cleanout and camera inspection of accessible lengths of underdrain pipes. <br /> N(8)OTHER: Per Item 48,Gear toe runoff channel culvert immediately south of toe drain outfall pipe.Protect toe drain area from <br /> disturbance by cattle and wildlife. <br /> N(9)OTHER: Per 2020 inspection,consider installing a concrete structure for collection of drain discharges to keep the area dry,to <br /> protect the pipes,and to facilitate access for 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 /> ❑(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 /> O(15)SET UP OR IMPROVE MONITORING SYSTEM: <br /> ❑(16)OTHER: <br /> ❑(17)OTHER: <br /> Figure 1 Overall Site Plan and Photo Log <br /> Figure 2 2023 Annual Dam Safety Inspection <br /> Figure 3 Piezometer Levels <br /> Figure 4 Underdrain Flow <br /> Attachment 2 2023 Inspection Photos <br /> (� Photographs (Photos 1-18) A �k and underdrain data) <br /> ENGINEER'S INSTRUCTION: Instructed owner on the s • r s ure and how to monitor and inspect the dam and <br /> . P 9 . <br /> appurtenant works in the interim period between the re latory48nnual insped6ns. N Yes C7 No <br /> Comment: <br /> i 3319 <br /> A9o.�••�V'z <br /> Professional Engineers Signature: ` •• Date: <br /> - _ 75 zai3 <br /> Reviewed by: / / <br /> Owner/Owners Representative ` ,le Date: T/7 7 l Zo z 3 <br /> Page 3 of 4 <br />