INSPEC14035

• Permit No: M1977493
• IBM Index Class Name: Inspection
• Doc Date: 3/24/2004
• Doc Name: Description of Findings and State Engineers Rpt Regarding the Robinson Lake Outlet Works.
• From: Climax Molybdenum Company
• To: DMG
• Inspection Date: 9/8/2003
• Media Type: D
• Archive: No

clvc~iNEERS INSPECTION REPORT INSPECTOR: JGB
. OFFICE OF THE STATE ENGINEER - DMSION Of WATER RESOURCES -DAM SAFETY BRANCH 1313 SHERMAN STREET, RODM BIB, DENJER, CO 80203, (303) 8663581
DAM NAME: ROBINSON T: 070S R: 0790W S: 33 COUNTY: EAGLE DATE Of INSPECT{ON: 7(17!2003
DAM ID: 370107 YRCompl: 1936 DAM HEN3HT(FT): 103.0 SPILLWAY WIDTH(FT): 42.0 PREVIOUS INSPECTION: Jt2472002
CLASS: 1 DAM LENGTH(fT): 1455.0 SPN-LWAY CAPACiTI((CFS): 1575.0 CAPACfTY(AF): 2800.0
DN: 5 WD: 37 CRESTWIDTH(fTg 33.0 FREEBOARD (FT): 7.f SURFACE AREA(ACr 80.0
EPP; 8/112002 CRESTELEV(FT): 10895.0 DRAINAGE AREA (AC.g 762.0 OUTLET INSPECTED:
CURRENT RESTRICTION -NONE-
OWNER: CLIMAX MOLYBDENUM CO CONTACT NAME: TAVIS ROGERS - EXT 615
ADDRESS: HIGHWAY 91 - FREEMONT PASS CONTACT PHONE: [phone]
CLIMAX CO 80429
INSPECTION PARTY: BfII H2RInOt00 John G Blair
REPRESENTING: Clima% Div 5 Dam Safety Enoineer
CONDITIONS WAIER LEYEL: BELOW DAY CREST
~,N Y 43.2 Fr.
SO.9 FT. Bg(py( a
WGE RODREADING
1(1844.1
OBSERVED GROUND MOSNRE CONtl110N: DRY _~ WET _p_6NDWDDM9I ~_ OTKER
DIRECTIONS: MARK AN %FOR CONDRIONS FOUND AND UNDERLINE WORDS THAT APPLY Condition: ,
-ROBLEMS NOTED U(0)NONE ~ (1)RIPRAP- MISSING, SPARSE, DISPLACED, WEATHERED [] (2)WAVE EROSION- WITH SCARPS 3C
^(3)CRACKS WITH DISPLACEMENT ~(A)SINKHOLE ~ (5)MPEARS TOO STEEP ~(6) DEPRESSIONS OR BULGES ~ (7)SLRIES ° A I
O 0 O

Q(BI CONCRETE FACING- HOLES, CRACKS, DISPLACED, UNDERMINED ~ (9)OTHER - D c °
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Reservoir being drained (pump back to tailings pond) for outlet inspection and possible rehabilitation to fresh v
water reservoir. No problems noted. i
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PROBLEMS NOTED ~f10)NONE ~(1p RUTS OR PUDDLES Q(12)EROSION Q(13)CRACKS- WITH DISPLACEMENT ^p4)SINKHOLES 7C JC ,

~(15)NOT WIDE ENOUGH ~(16)LOW AREA ~(/7)MISALIGNMEM ~I18)IMPROPER SURFACE DRAINAGE ©n9)OTHER 0
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Crest recently regraded. (191: Large rocks under surface and old pipelinenear spillway inhibit regrading. See O
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PROBLEMS NOTED Q(2O)NONE ~j(21)LB/ESTOCKDAMAGE ^(22)EROSION OR GULLIES ~(23)CRACKS-WITH DISPLACEMENT ~(2d)SINKHOLE x
-
~(25)APPEARS TOO STEEP ~(26) DEPRESSIONS OR BULGES Q(27)SLIDE ~(28)SOFT AREAS ~(29)OTHER 0
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No problems noted O
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PROBLEMS NOTED ^(30)NONE ~(31)SATURATED EMBANKMENT AREA ~(32)SEEPAGE E%ITS ON EMBANKMENT ~ )('
Q(33) SEEPAGE EIOTS AT POINT SOURCE 0134) SEEPAGE AREA AT TOE O(35) FLOW ADJACEM TOOUTLET Q(36) SEEPAGE INCREASED !MUDDY ~ o ° o
DRAM OUTPALLS SEEN SNKY DCa6on o(dranE On 6kekh and iMiwN O7 o c o
~NO QVec ~j(37)FLOW INCREASED /MUDDY C(38)DRAIN DRY/ OBBiRUCTEO P E 0.
amwml and Sootily of disdlarga. ~
^(39)OTHER Y A
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Total general seepage in channel upstream from collection pond Is estimated to be 6 gam afloat method). Toe Y E
drain is drv due to low reservoir level. Seepage associated weith old outlet or valve leakage =1 gpm °
2
RROBLEMe NOTED ^(90)NONE ~(41)NO OUTLET FOUND ~(42)POOR OPERATING ACCESS ®(43)INOPERABLE 3t
~(a) UPSTREAM OR DOWNSTREAM STRUCTUREDEiER10RATE0 (45)OUTIETOPERATEDDURINGINSPECTION AYES ^NO ° " P
D c 0
INfERttfRINSPECTEO ^f/2o)NO ~p21)YES Q(46)CONDUn DETERIORATED OR COLLAPSED Q(47}JOINTS DISPLACED ~/(40)YNYE LEAKAGE D E B
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0(d9j OTHER Unknown condition of outlet T
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Old outlet & siphon has never been inspected or the valves operated in moon nears. It unknown condition and L
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. .
-ROBLEM9 NOTED [~(50l NONE U(51)NO EMERGENCY SPILLWAY FOUND U(51)EROSION WRN BACKCUTTING U(53)CMCK-WITH DISPLACEMENT N.
(57) FLOW OBSTRUCTED p 0 0
~(Sl) APPEARS TO BE STRUCTURALLY INADEWATE ~(55) APPEARS TOO SMALL ~ (SS) INADEQUATE FREEBOARD 0 A P
~(58)CONCRETE DETERIORATED !UNDERMINED ~159)OTHER D c 0
D E A
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No problems noted. A haul road may be Placed in front of the spillway totally blocking it temprarily to build ,T,
cofferdam for outlet inspection. This is OK because volume of reservoir above cofferdam eceeds total °
vnHlmn n/ Fn^/. PMP rninhii wF/h nn INCCPS E