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DAM NAME: San Luis Tailing Dam DATE OF REPORT: May 5, 2017 <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: Drop structure outlet(Photo 19)and access road culvert inlet at left downstream groin(Photo 30) <br /> (see Item 65) <br /> 0(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 /> ❑(5)PROVIDE SURFACE DRAINAGE FOR: <br /> Z (6)MONITOR: Per Item 22,monitor rilling and gullying at right downstream groin(Photos 22,23). <br /> ® (7)OTHER: Per Item 29 at right downstream groin,repair cross berms and rock-lined down-drain channels where damaged by <br /> runoff(Photo 24). Repair and consider armoring the shallow gully at the base of the groin(Photo 25). <br /> ❑(8)OTHER: <br /> ❑(9)OTHER: <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 /> ❑(15)SET UP OR IMPROVE MONITORING SYSTEM: <br /> ❑(16)OTHER: <br /> 0(17)OTHER: <br /> Recommended schedule for upgrades/implementation of recommendations(please prioritize and note importance of each): <br /> - Item 29 to be completed in 2017:At right downstream groin,repair cross berms and rock-lined down-drain channels where <br /> damaged by runoff,and repair the shallow gully at the base of the groin. <br /> - Item 65 to be completed in 2017: Removal of sediment and brush/debris from drop structure outlet,and access road culvert inlet at <br /> left downstream groin). <br /> - Items 22 and 29:Monitor progression of rill and gulley formation,and potentially at other areas on downstream face in subsequent 2017 <br /> and 2018 inspections. <br /> ® Photographs ❑ 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. Z Yes 0 No <br /> Comment: <br /> Professional Engineer's Signature: Date: <br /> Reviewed by: Date: <br /> Owner/Owner's Representative <br /> Page 3 of 4 <br />