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DAM NAME: San Luis Tailing Dam DATE OF REPORT: July 11,2024 <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. Per Items 42 and 49,begin preparing plans to repair erosional rilling. Mitigation <br /> should include constructing features along the slope to reduce runoff flow path <br /> lengths,followed by reseeding and installation of erosion control blankets <br /> 1 1(2)CLEAR BRUSH FROM: <br /> Li(3)INITIATE RODENT CONTROL PROGRAM AND PROPERLY BACKFILL EXISTING HOLES: <br /> [7(4)GRADE CREST TO A UNIFORM ELEVATION WITH DRAINAGE TO THE UPSTREAM SLOPE: <br /> N(5)Survey the top of internal casing and ground surface at each VWP and standpipe piezometer location <br /> 64 (6)MONITOR: Monitor slope along the south side of the south diversion channel drop structure. <br /> N(7)MONITOR: Continue underdrain jetting cleanout and camera inspection of accessible lengths of underdrain pipes. <br /> DI(8)OTHER: Per Steve Carino,the temporary access berm and culvert to left(south)of the drain outlets will be removed. Protect <br /> toe drain area from disturbance by cattle and wildlife. <br /> [-0 (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 /> O(10)PREPARE PLANS AND SPECIFICATIONS FOR REHABILITATION OF THE DAM: <br /> Cl(11)PREPARE AS-BUILT DRAWINGS OF: <br /> Cl(12)PERFORM A GEOTECHNICAL INVESTIGATION TO EVALUATE THE STABILITY OF THE DAM. <br /> 0(13)PERFORM A HYDROLOGIC STUDY TO DETERMINE REQUIRED SIZE OF FLOOD BYPASS/SPILLWAY: <br /> Cl(14)PREPARE PLANS AND SPECIFICATIONS FOR AN ADEQUATE SPILLWAY: <br /> C1(15)SET UP OR IMPROVE MONITORING SYSTEM <br /> [1(16)OTHER. <br /> Cl(17)OTHER <br /> Figure 1 Overall Site Plan and Photo Log <br /> Figure 2 2024 Annual Dam Safety Inspection <br /> Figure 3 Piezometer Levels <br /> Figure 4 Underdrain Flow <br /> Attachment 2 2024 Inspection Photos <br /> • <br /> �'SS.1SL1� <br /> Photographs (Photos 1-18) ® Atta•,� 1 d underdrain data) <br /> t .•S .0 ,9 1 <br /> ENGINEER'S INSTRUCTION: Instructed owner on the s-� o1'Olns witFi('h,LTru '.�e and how to monitor and inspect the dam and <br /> • <br /> appurtenant works in the interim period between the reg ',torp annual inspectioriS. j Yes O No <br /> • <br /> Comment: • 93 19 <br /> Professional Engineer's Signature: /, fp" dDate: 1///Z0ZZY <br /> Reviewed by: � Date: 7//.512.V <br /> Owner/Owner's Representative <br /> Page 3 of 4 <br />