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DAM NAME: San Luis Tailing Dam DATE OF REPORT: May 5, 2017 <br /> TAILINGS DAM INSPECTION FORM <br /> Directions: Mark and X for conditions found and underline words that apply <br /> SEEPAGE AND DRAIN OUTFALL <br /> PROBLEMS NOTED: <br /> ❑ (30)NONE ❑(31)SATURATED EMBANKMENT AREA ❑(32)SEEPAGE EXITS ON DAM <br /> ❑ (33)SEEPAGE EXITS AT POINT SOURCE El(34)MINOR PONDING OF PIPE LEAKAGE <br /> AT TOE <br /> DRAIN OUTFALLSEEN: ®YES ❑ NO <br /> ❑ (35)FLOW ADJACENT TO DRAIN PIPE ❑(36)DRAIN OUTFLOW TURBID ❑(37)DRAIN DRY/OBSTRUCTED <br /> ❑ (38)OTHER <br /> SHOW LOCATION OF DRAIN ON SKETCH See Figure 1 <br /> AND INDICATE AMOUNT AND QUALITY OF SEEPAGE Approximately 30 gpm clear flow(See Photo 15). Previously noted seepage face at toe <br /> drain is dry. <br /> CONDITIONS OBSERVED: ❑ GOOD ❑Y ACCEPTABLE ❑ POOR <br /> STORM WATER MANAGEMENT SYSTEM <br /> PROBLEMS NOTED: <br /> ❑ (40)NONE ❑(41)NO EMERGENCY SPILLWAY ❑(42)EROSION AT DROP STRUCTURE <br /> ❑(43)CONCRETE DETERIORATED/UNDERMINED ❑(45)STRUCTURE MAY BETOO SMALL <br /> ❑ (46)DIVERSION CHANNEL EROSION ❑(47)INADEQUATECHANNEL FLOWCAPACITY ❑(48)CHANNEL FLOW OBSTRUCTED <br /> ❑ (49)OTHER The south diversion channel was widened in 2016 in preparation for 2018 construction of a new spillway. <br /> CONDITIONS OBSERVED: ❑ GOOD © ACCEPTABLE ❑ POOR <br /> MONITORING <br /> EXISTING INSTRUMENTATION FOUND: <br /> ❑(50)NONE ❑(51)GAGE ROD IN POOL AREA (52)PIEZOMETERS <br /> ❑(53)SEEPAGE WEIRS/FLUMES ❑(54)SURVEY MONUMENTS ❑(55)OTHER <br /> MONITORING OF INSTRUMENTATION: <br /> ❑ (56)NO WEIRS/FLUMES ®(57)YES <br /> PERIODIC INSPECTIONS BY: <br /> M (58)OWNER ❑ (59)ENGINEER <br /> CONDITIONS OBSERVED: ® GOOD ❑ ACCEPTABLE ❑ POOR <br /> MAINTENANCE AND REPAIRS <br /> PROBLEMS NOTED: <br /> ❑ (60)NONE Ell(61)ACCESS ROAD NEEDS MAINTENANCE ❑(62)CATTLE DAMAGE <br /> ❑(63)BRUSH ON:UPSTREAM SLOPE/BEACH,CREST,DOWNSTREAM SLOPE,TOE <br /> ❑(64)RODENT ACTIVITY ON:UPSTREAM SLOPE/BEACH,CREST,DOWNSTREAM SLOPE,TOE <br /> Z (65)OTHER Remove sediment and brush debris from drop structure outlet(Photo 19)and access road culvert inlet at left downstream <br /> groin(Photo 30). <br /> CONDITIONS OBSERVED: ❑ GOOD X ACCEPTABLE ❑ POOR <br /> OVERALL CONDITIONS <br /> Based on this inspection and recent file review,the overall surficial condition is determined to be: <br /> ❑ SATISFACTORY El CONDITIONALLY SATISFACTORY ❑ UNSATISFACTORY <br /> Page 2 of 4 <br />