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DAM NAME: San Luis Tailing Dam DATE OF REPORT: 06 21 16 <br /> TAILING DAM INSPECTION FORM <br /> ITEMS REQUIRING ACTION BY OWNER TO IMPROVE THE SAFETY OF THE DAM <br /> MAINTENANCE • MINOR REPAIR • MONITORING <br /> 0(1)PROVIDE ADDITIONAL EROSION PROTECTION: To improve right groin repair area erosion control <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 /> ❑(5)PROVIDE SURFACE DRAINAGE FOR: <br /> ❑(6)MONITOR: <br /> ❑(7)OTHER: <br /> 0(8)OTHER: Implementation of South Diversion Ditch Improvements per recent(2015-16)design will improve flood protection <br /> ❑(9)OTHER: <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 /> 0(16)OTHER: Implementation of South Diversion Ditch Improvements per recent(2015-16)design will improve flood protection <br /> ❑(17)OTHER: <br /> Recommended schedule for upgrades/implementation of recommendations(please prioritize and note importance of each): <br /> 1) Right groin erosion protection: modify contour berms and rock-lined downdrains to prevent short-circuiting <br /> 2)South Diversion Ditch Improvements per engineered plans and specifications prepared Dec 2015 <br /> Attachments:Piezometer readings,Photo Log <br /> E Photographs I1 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: 6/21/2016 <br /> Reviewed by: Date: <br /> Owner/Owner's Representative <br /> Page 3 of 4 <br />