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

DAM NAME: ROBINSON
Page 2 DAM I.D.: 370107 DATE. 7/772003
EXI6TING INSTRUMENTATION FOUND '~ p10)NONE ~J(11 tj GAGE ROD LJp12)PIEZOMETERS U(113)SEEPAGE WEIRS /FLUMES Xs
L,'j114)SURVEY MONUMENTS ^ (715)OTHER

•
MONITORING OF INSTRUMENTATION ^ (116)NO C(117)YES PERIODIC INSPECTION$BV: E%j(116)pWNER ~(119)ENGINEER 4
D ~ P
e O
O r O
Monuments need to be resurveyed and report submitted to our office. n ; R
• •
PROBLEMS NOTED: ^(60 NONE ^ (61)ACCESS ROAD NEEDS MAINTENANCE ^ (62)CATTLE DAMAGE X
• ^(63)BRUSH ON UPSTREAM SLOPE. CREST, DOWNSTREAM SLOPE, TOE ^(W)TREES ON UPSTREAM SLOPE. CREST, DOWNSTREAM SLOPE. TOE
c
~ P
~/ (66) RODENT ACTNITY ON UPSTREAM SLOPE, CREST, DOWNSTREAM SLOPE
^ 77PS~ ^(66)DETERIORATED CONCRETE- FACING. OUTLET SPILLWAY O
o a 0
e o

^(67)GATE AND OPERATING MECHANISM NEED MAINTENANCE ^(68)OTHER 0 i R
•
Usual rodent activity in area at the toe of the downstream slope between the spillway and maximum ,
e
' section of dam. See page 3.
Dam is in satisfactory condition, but unknown condition of old outlet. with its intake buried in silt, has been

;' neglected for many years warrants conditionally satisfactory rating. Also condition of siphon is unknown.
:.
• • Based on Dlis Safety Inspection and recent file review, the overell corWition is detemlined ro be:
^(71)SATISFACTORY O(72)CONOInONALIY SATISFACTORY ~ ^(73)UNSATISFACTORV
ITEMS REQUIRING ACTION BY OWNER
TO IMPROVE THE SAFETY OF THE DAM
O `p w
q
o IWNTENANCE-NNOR REPAIR•MONff01UNG
•
C G aYt ^(80) PROVIDE ADDITIONAL RIPRAP;
~ o = `O (B1) LUBRICATE AND OPERATE OUTLET GATES THROUGH FULL CYCLE
o •' `r a Ei (62) CLEAR TREES AND/OR BRUSH FROM: '
O w O • W
g + 63) INRIATE RODENT CONTROL PROGRAM AND PROPERLY BACNFILL EXISTING HOLES:
^`r( downstre
m
slo
e
&to
ov =
C u ~ u E _
p
_
e._...
a
IJ (BQ GRADE CREST TO A UNIFORM ELEVATION WRH DRAINAGE TO THE UPSTREAM SLOPE:

c • ~ r ..
D a • r ~
' Add TOI.2_fOBQ t12Se t0 l112ke It eaBlef [O maipla

^ ln_ _ _ _ _ _, _ _
= O • a
API •w c (e6) PROVIDE SURFACE DRAINAGE fOR:
c _a r, _...__........_............_._......_._....__ .............._............_....._.._.............._..._................_..
~(B7)OEVELOP AND SUBMIT AN EMERGENCY PREPAREDNESS PLAN: ...........
y~_'~9
o . 2 0 UpAat@J7~ar185 CI13I1gB5000Ur______ __________ ____________________
~(6s) orHER ___________

•^oN n?
E ~ ~ O ~ remove oldpipeline from dam crest near the spfNway to make crest regrading easfer,_,_
^
~
89
OTHER

$ ~ E a (
)
Uncover outlet Intake
qy ~ ~ ENGINEEWNG-EMROY AN ENGINEER EXPERIENCFDNDESIGN ANO CONS7RUC110X OF DAMS iO: (%a¢ad$pecificationa must ee approved by Stale Elpineer pdarMansVOCSOn.)
Y ^(90) PREPARE PLANS AND SPECIFICATIONS FOR REHABILITATION OF THE DAM:
o
e ^(97j PREPARE AS $UILT DRAWINGS OF:
'
li a
u~ e H E .___...... _._........._..-_
^(92) PERFORM AGEOTECHNICAL INVESTIGATION TO EVALUATE THE STABILITY OF THE DAM:
__. .... ___.

..
,
a
a4 ~ ~ ........_..__
.__......._... _.......... _._.._...
^(93) PERFORMAMYDROLOGIC STUDY TO DETERMINE REQUIRED SPILLWAY SIZE: .__
....
~
c c O (~) PREPARE PIAN$ AND SPECIFICATIONS FOR AN ADEQUATE SPILLWAY:
Y
+
c ii .", 3 3
(96) SET UPAMONITORING SYSTEM INCLUDING WORKSHEETS, REDUCED DATA AND GRAPHED RESULTS:
. ~(%)PERFORM AN INTERNAL INSPECTION OF THE OUTLET:
9 ~
CrU BOtll Old_pIpB S_SlpllOfl_J(2eJl US apli_58d Of lnspCttf_On B•SUbrlllt repOR,_. .____,._.,,
m = u `" _ ^(97) o7NER: For outlet inspection, epnstruet cofferdam as.planned under dire_cbo_n of_ e_ngineer _ __ __
_ _ __
..
...
........
L N • L Y
~ +C s o _
..
~
^
9e
THER
(
) O
: The su_bmittal_of plans and_specs for ltem.i97i are not required----------------------------------------------------------- ------------
^1991 OTHER:
SAFE STORAGE LEVEL RECOMMENDED AS A RESULT OF THIS INSPECTION
^(101) FULL STORAGE FT. BELOW DAM CREST
`j(102) CONDITIONAL FULL STORAGE
FT. BELOW SPILLWAY CREST
~ _
^(103) RECOMMENDED RESTRICTION FT. GAGE HEIGHT
~~~ ~ NO STORAGEJ•IAINTAIN OUTLET FULLY OPEN
^ (101) CONTW UE EXISTING RESTRICTION
REASON FOR RESTRICTION
ACTIONS REQUIRED FOR CONDITIONAL FULL STORAGE
terns 97 and 96
/
<
~(~(/ Dwnara
•
Engineers ~~ -
&9naMe ~ _ _Signatve DATE:
'
S REPRESENTATNE _
__ INSPECTED BY _ _ _ OWNER/OWNER 2A _