2018-09-10_INSPECTION - M1988112

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DAM NAME: San Luis Tailing Dam DATE OF REPORT: 06 20 18 TAILING DAM INSPECTION FORM Name of Professional Conducting Inspection: Colorado P.E.License No.: Debora J.Miller,Ph.D.,P.E. 25018 Company Name and Address: Phone No.: (970)581-8988(M) Miller Geotechnical Consultants,Inc. 2837 Skimmerhorn Street email: Deb.Miller@millergeotech.com Fort Collins CO 80526 INSPECTION PREPARATION: I have reviewed all pertinent technical documentation related to this dam and site in the Owner's files: 0 Yes ❑ No Comment: STATEMENT OF EXPERIENCE: I am experienced in the technical disciplines necessary to properly inspect this dam and appurtenant works, including civil and geotechnical engineering. 0 Yes ❑No Comment: YR COMPL 1990-91 Ph I T/R/Section COUNTY DATE OF INSPECTION: 06/20/18 1993 Ph It Raise 1 Not Applicable/ Costilla 1995 Ph II Raise 2 Sangre de Cristo Land Grant DAM HEIGHT(FT) DAM LENGTH(FT) CREST WIDTH(FT) PREVIOUS INSPECTION: 155 1,900 25 05 05 17 FREEBOARD(FT) DRAINAGE AREA(AC) CREST ELEV(FT) MAX.STORAGE(AF) MAX.SURFACE AREA(AC) ±12 1741 total;537 diverted +8620 1105(at dam crest) 136.7(at dam crest) BEACH LENGTH ABOVE POOL(FT):600 FT DIVERSION CHANNEL CAPACITY(CFS):0' Upgrade under construction OWNER: OWNER REPRESENTATIVE/CONTACT: Battle Mountain Resources,Inc. Julio Madrid OWNER ADDRESS: OWNER CONTACT PHONE NOS.: P.O.Box 310,San Luis,CO 81152 719-379-0538 Cell FIELD CONDITIONS WATER LEVEL BELOW DAM CREST: ±12 FT OBSERVED GROUND MOISTURE CONDITION: 0 DRY ❑WET ❑SNOW COVER ❑OTHER Directions: Mark an ✓ for conditions found and underline words that apply UPSTREAM SLOPE AND BEACH AREA PROBLEMS NOTED: ❑(0)NONE ❑(1)EROSION PROTECTION-Missing,Sparse ❑(2)BEACH AREA WAVE EROSION ❑(3)CRACKS WITH DISPLACEMENT ❑(4)SINKHOLE ❑(5)APPEARS TOO STEEP ❑(6)DEPRESSIONS OR BULGES ❑(7)SLIDES ❑(8)ANIMAL BURROWS 0(9)OTHER: Photos 3-4:Minor leakage from pump-back pipeline is saturating a limited zone of upstream beach area. Otherwise no problems noted. CONDITIONS OBSERVED: 0 GOOD ❑ACCEPTABLE ❑ POOR CREST PROBLEMS NOTED: 0(10)NONE ❑(11)RUTS OR PUDDLES ❑(12)EROSION ❑(13)CRACKS WITH DISPLACEMENT ❑(14)SINKHOLES ❑(15)NOT WIDE ENOUGH ❑(16)LOW AREA ❑(17)MISALIGNMENT ❑(18)IMPROPER SURFACE DRAINAGE ❑(19)OTHER CONDITIONS OBSERVED: 0 GOOD ❑ACCEPTABLE ❑POOR DOWNSTREAM SLOPE PROBLEMS NOTED: 0(20)NONE ❑(21)LIVESTOCK DAMAGE ❑(22)EROSION OR GULLIES ❑(23)CRACKS WITH DISPLACEMENT ❑(24)SINKHOLE ❑(25)APPEARS TOO STEEP ❑(26)DEPRESSIONS OR BULGES ❑(27)SLIDES ❑(28)SOFT AREAS ❑(9)OTHER: CONDITIONS OBSERVED: 0 GOOD ❑ACCEPTABLE ❑ POOR Photos 17-21: Slope appears stable and vegetation cover is in generally good condition on d/s slope. Right downstream groin area that was repaired in 2014 is in fair condition. Some minor rilling is occurring where erosion control contour berms are being short-circuited,and the rock-lined downspouts are losing rock which is slipping on the underlying geotextile. Photo 8: Minor gullying observed adjacent to access road on left abutment groin. Page 1 of 4