Laserfiche WebLink
DAM NAME: San Luis Tailing Dam DATE OF REPORT: 08 25 20 <br /> TAILING DAM INSPECTION FORM <br /> ITEMS REQUIRING ACTION BY OWNER TO IMPROVE THE SAFETY OF THE DAM <br /> 1 MAINTENANCE • MINOR REPAIR • MONITORING <br /> 0(1)PROVIDE ADDITIONAL EROSION PROTECTION: Disturbed ground areas adjacent to the recently constructed South Diversion Ditch Drop <br /> Structure should be monitored and repaired as needed for erosion. It may be necessary to re-seed these areas. <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 /> 0(5)PROVIDE SURFACE DRAINAGE FOR:Modify the grading in the lower right groin area to direct surface runoff away from the downstream toe <br /> ' area. <br /> ❑(6)MONITOR: <br /> 0(7)OTHER: Perform jetting cleanout and camera inspection of accessible lengths of underdrain pipes. <br /> ' 0(8)OTHER:Protect toe drain area from disturbance by cattle. Fix leak in outfall pipe to prevent water ponding in this area. <br /> 0(9)OTHER:Consider installing a concrete structure for collection of drain discharges to facilitate access for cleanout and monitoring of the drains. <br /> ENGINEERING 0 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 /> ❑(16)OTHER: <br /> ❑(17)OTHER: <br /> ' Attachments: <br /> 1)Photo Log and map(Figure 1) <br /> 2)Recent piezometer(Figure 2)and under-drainage flow rate readings(Figure 3) <br /> 3)Conceptual design for toe drain collection manhole(Figure 4) <br /> 21 Photographs 21 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: 8 25 20 <br /> r I <br /> Reviewed by: Date: <br /> Owner/ ner's Representative <br /> i <br /> Page 3 of 4 <br />