HomeMy WebLinkAboutWTR2700371(2) W-371 HIGHLANDS 3/4 MG & MT. OLIVET 3 MG TANKS WTR-ll 1
#3 Maintenance
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11 June 1911
r � SO4.48
Mr. Warren C. Gonnaaon, P.E.
City Engineer - City of Renton
Municipal Building
Renton, WA 98055 F
c'
Dear Mr. Gonnason:
Subject: Cathodic Protection-water Storage Reservoirs
During the latter part of 1971, cathodic protection systems were
installed in the City's 3 mg Mt, plivet reservoir and 3/4 mg
Highlands elevated tank. (Please refer to C112M/Hill report dated
24 February 1972.)
Recommendations were made in our report for monthly rectifier
checks and an annual survey of both systems (see Chapter Iv of
report) . These monthly checks and annual surveys are quite
important and neeeisary to ensure efficient operation of the
cathodic protection systems. We trust that the morthly checks
have been harried out by City personnel as recommended, and
that the cathodic protection systems are functioning properly.
As fur as we know, there was no annual survey made of the
systems last year.
In order to determine that the cathodic protection .,,.yatems are
operating correctly and that the structures are receiving ade-
quate protection against corrosion, we would suggest that a
complete survey of both Systems be made this year.
This survey should include the. following:
1. A review of the monthly readings taken at both facilities
during the past 1-1/2 years.
2. Complete potential readings taken inside of each reser-
voir, to determine that all modes are discharging cur-
rent properly.
3. A visual inspection of anode assemblies in both reservoirs.
Mr. Warren C. Gonnason, P.E.
11 June 1973
page 2
4. Checking of rectifier voltmeters and amr^tern at both
locations, and calibrating as necessary.
S. Circuit resistance checks of botn systens and rectifier
efficiency checks of both rectifiers.
6. Adjusting of rectifiers as required, to provide correct
cathodic, protection potentials or. the structures.
Our corrosion engineering personnel will be available to make
this survey, if you so desire. It. will not be necessary to drain
either reservoir or interrupt water service in any way.
A complete report would be made or the survey and would include
recommendations concerning the continued operation of the cath-
odic protection systems.
With your approval we would perform the survey on the basis of
our standard engineering service rates. Pilling would be only
for the actual time spent on the project. The estimated cost for
this survey is as follows:
Survey of Systems (as itemized above) :
Corrosion Specialist (2 days) $250.00
Corrosion Technician f2 days) 160.00
Report and Recommendations
Corrosion Specialist (1/2 day) 62.50
Corrosion Engineer (1/2 day) 110.00
Office (typing) 25.00
Reproduction 5.00
Ex eensas
".Pavel 10.00
'rota l
We will be able to complete this survey within 30 days after
authorization to proceed is receivr*d from your office
If you have any questions concerning the proposed work, please
contact us. Thank you for the opportunity to be of service.
Mr, warren C Gonnason, Y.E.
11 June 1971
page 3
we •wou13 appreciate continuing our work with the City.
Sincerely,
George Silkwor'�N�'!
Manager, Corrosion Fnyineering
GIIS/'HFG;'lb
• INTER-OFFICE MEft •
TO• Warran Gunreaacn
DATEiLJ:P 15. 1:y.
FROM:
-'nsXd Hough tcn
RE:
In reqaiadi Lndica -a
tes tc the a- chen memo
ha c , raviewad this wit.$ X" Rr1dar and
we have kept Monthly records but he would suggeRt *hat
we autYinrire CH3M to
covered under items l a viuual ised.Mott and do the wrik through C es propesad.:
We have the money available in .cur Professional Services Areount to
havp said Work performed.
ACH:lmp
Attachment
c nu,. 15. 1971
C#2m will
V11AX1ehh :,,atlCtt bull8lsK±
'rsshibatm OW-01
#ttn Gtorq• H. ci Ikrbrth
pan t1®sr.•
;n rati:onts to ywxr letter cd dUltt 11. 1173 rsgtrdinj daatbodic pXy
teotixm, tAis lsttsr V%ll evth:xrits YOU to pra ood with the sotvey
co"Clog €two I !rxro"b d in your lettwr.
NO ha"s tsk n wonSly rsedlygv sna s rae.nrd cIt these Us bw kett
by WeM rt13er or b SiSpal h..iniryoa..
Ms vwdwrsund fiat the swtbheted Cent or this is &"4!mitttt44y
$W# orl.
Upon omr1•tian or vmr o1raty, pltlws nutmit t" A an itrwlsK
bi1'1inq. and .e st 11 rr *" rur ivrwent..
tman4 y»xx V+r yncsr €ntw-"t in thin suttex.
very truly y(O"O'
Werr'tn [. OrwlMsft. 1�'F'
Fub11C Worlto trirettox
Piah/rd C. dbeghtew
utilities Wginwr
♦arras Gonnasm .lnna is, 1973
Richard R.>ughtx,
In regard tc the attselwd m=7, reetared this with Kan wider and
t® indicstee we nave kept nnnthly racnrdl but he would Suggest that
wa authcrtre .'61M tc give us a visml L"P*etion and do the work
covered ,alder itaus I through 6 as propaled.
ve have the %- *v available In our lrctaaaimal services rccaant t,
-,ars said work pertormad.
RCH,}eq
attaohmen•
C@@NEIL M@WLAIM,MAVIS@ MER@rflEU
l i Y. Bmness R•.. ,nN 77'`60 Me N I CtAftw 4mtinpm-9PG34.To 2I7645$US0II Wry hrr�nd ornm
,wsac errn «rnosr
14 September 1973
Project No. S6537.2
Mr. Warren C. Gonrason, P.E.
Public Works Director
Citv of Renton
Renton, Washington 98055
Dear Mr. Gonnason:
Subject: Survey of Cathodic Protection Systems -
City of Renton Water Storage Reservoirs
In accordance with your letter of authorization dated 15 June 1973,
a complete survey was made of the cathodic protection systems
in the City of Renton's 3-mg Mt. Olivet reservoir and the 3/4-
mg Highlands elevated tank. This survey was carried out on 11
July 1973, as per arrangements made by Mr. Richard C. Houghton,
Utilities Engineer for the City of Renton.
The following is a summary of the survey, which was made as per
our letter dated 1.1 ,lure 1973=
1 . A review was made of the monthly readings taken at both
fa-Iliitie_since t.hev a_e rs�or3ginally iLaced in service.
The cathodic protection system at the Mt. Olivet reservoir
was placed in service on 8 November 1971. After the
system had Polarized, the structure-to-reference electrode
potential was set on 3 January 1972. The monthly readings
show that this pre-set potential has been maintained
satisfactorily since that time. The potential of the
Ht. Olivet reservoir was ad:i usted on 11 .July 1973. This
was done after a potential profile was run inside the
reservoit. The pre-set potential was increased in order
to provide more adeyua-e corrosion control. Data Sheet
No. l apuended to this report shows the readings taken
at this _acility on 11 July 1973 when first checked,
and the readings taken after the structure-to-reference
electrode potential was increased. Data Sheet No. 2
is a record of the current flow to the anode rings. These
readings were taken prior to increasing t,re output of
the rectifier. Also included on this sheet are resistivity
and off readings made of the water in the reservoir.
1 Mr. Warren C. Gonnason, P.E.
14 September 1973
Page -2-
1 The cathodic protection system at the Highlands tank was
placed in service on 29 October 1971. After the system
1 had polarized, the structure-to-reference electrode potential
was set on 7 January 1972. Since that time the rectifier
has maintained this potential within 10 to 30 millivolts.
Data Sheet No. 3 shows the readings taken at this location
1 on 11 July 1973.
2. Potential readin s were taken inside of each reservoir.
1 ese rea ings were to en p moving a copper-su p ate
reference electrode vertically along the wall of the
reservoirs and recording the resulting potential "profile."
1 The potential profile was made through the permanent zinc
reference electrode hole in the roof of the Mt. Olivet
reservoir. Data Sneet No. 4 is a record of this profile.
1 As was mentioned, the output of the recti Eier at this
location was changed to increase the potentials in the
tank following this profile.
1 The potential profile inside the Highlands elevated tank
was made along the inside steel ladder, through the
inspection hatch. It was not possible to reach the
1 reference electrode hole in the roof of the tank. This
Potential profile is shown on Data Sheet No. 5. Potentials
along the steel ladder are in good order and show the
current discharge from -tie anodes in the system.
3. A visual ins 'P ction wns made of anode assemblies in both
reservoirs. Two ano a assemb of were se ecte at ran on
1 i_n each tank and were pulled and checked. Pictures
No. 1 through 5 show some of the anodes which were inspected.
1
1
1
i ..
1
1
string removed from
1 Nth Olivet reservoir. fog inspection.
11 July 1973
' Mr. Warren C. Gonnason, P.E.
14 September 1973
Page -3-
`r
t
t
1 �IFaI
�losc u;. of an-,ees shown
inicture No. 1, anodes and cables in
excellent conditions. v.. ro 1;tt?.,.
loss in anode' .
1 -
i
Picture No. 3 - Anode string remov..r., iror+
high an s e evated tank for inspection.
11 .7uly 1971
Ar. Warren C. Gonnason, P.E.
/ 14 September 1973
Page -4-
1
1 A
' Picture No. 4 - Close up of anodes shown
in picture NoNo. 3. Anodes and cables in
excellent condition. Verv_ little metal
loss in anodes noted.
,
' icture No. 5 - Close up of
.. - node removcu from Highlands
icvated tank. .,nodes are in
t ay excellent condition, with
WK ILO ery little deterioration
e, wrw• :.oted.
a
t Mr. Warren. C. Gonnason, P.E.
14 Septeriher 1973
Page -. -
' 4. The voltmeter and ammeter in each rectifier were checked
tfor accuracy mac ca ibrate7as necessary.
The meters in the Mt. 31ivet rectifier were adjusted
to read correctly. The results of this check are shown
' on Data Sheet No. 6.
While checking the me�ers in the rectifier at the Highlands
tank, it was found that the rectifier could not be edjusted
above 11 volts and 8 amperes of current. It was suspected
that the potentiometer on the printed circuit board of
' the silicon-controlled rectifier (SCR) unit was faulty.
This was reported to rir. Ken Kriler of the Traffic Signal
Department, and arrangements were nade to have this
unit checked out later in the week mother check was
' made of this rectifier on 24 July 1973. This cheek was
made with :Mr. Cliff as is of the Traffic Signal Department.
Mr. Davis had been able to adjust the rectifier to 20
volts the previous week, but the maximun output possibl>
on 24 July 1973 was agai.•i approximately 11 volts and
8 amperes of current.
' A letter was written to the rectifier manufacturer requesting
a schewtic on the SCR so that. the Traffic Signal Depart-
ment might test the unit out anr9 )cssibly make repairs.
' Data Sheet No. 7 shows the mete: cieck as made on 11
.`uly 1373. The meters is this rectifier were also adjusted
to read correctly.
' - . N _ircuit resistance check was made of both systems.
Data Sheet No. 8 shows the results of the check at the
mt. Olivet system, and Data Sheet No. 9 shows the results
of the check at the highlands system. The circuit. resist-
ance in both systems has decreased slightly from when
' ,riginally planed in service. The lower circuit resistance:
utll result in more efficient operation of the systems.
6. The ststems were ad'ustad as necessary to provide adequate
cat is protection pot£ntsa s on the structures.
A? was mentioned under item (1) , the output of the cathodic
protection system at the It. ollvet reservoir was increased
to provide more satisfactory
fatory potentials inside the reser-
voir.
' changes were necessary at the Highlands tanks, since
•'he potentials were found to be satisfactory.
' Conclusions and Recommendations
Both cathodic protection systems were found to be operating correctly
■ during this survey. The recti£.i.ers have been properly maintaining
! the preset structure-to-reference electrode potentials. The anodes
in both systems are discharg-ing current properly and show very
' little deterioration or metal loss.
' Mr. Warren C. Gonnason, P.E.
14 September 1973
Page -6-
The only problem found during this survey was that of the inabilit;
' to increase the output of the rectifier at the Highlands tank
to its full capacity. A letter and Service Manual were recently
received from the rectifier manufacturer. These are enclosed
with this report. The manufacturer has suggested that one SCR
' is not firing and that only half voltage is being received.
Messrs. Krider and Davis should be ab.e to check this unit out
completely with the aid of the enclosed service manual. Repairs
' shaald be made to ensure that this rectifier is maintained in
proper working condition. if we can be of further assistance in
this matter, we will be glad to help in whatever way might be
t possible.
The monthly check of both systems should be continued and the records
of these checks should be maintained as in the past. A supply of
' new Cathodic Protection Rectifier Maintenance Record sheets are
enclosed with this report.
t The structure-to-reference electrode potential at th Nt. Olivet
reservoir should be maintained at -0.1.5 volts.
The structure-to-reference electrode potential at the Highlands
elevated tank should be maintained at -0.50 volts.
Another complete survey of both systems should be made in approxi-
mately 2 years. (An annual survey should not be necessary unless
problems arise.)
Thank you for the opportunity to serve you in this manner, if we
can be of further assistance with corrosion problems, please
contact us.
Rec>eotf uI lv subgm/igttpd,
V
3?orge H. Silkworth
Manager, Corrosion Control E.nginear r,g
{
r
Henry F. Galka
t Corrosion Concrol Engineeri.na,
Discipline Coordinator
Seattle Regional Office
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CH2MSMde Repo" Mm
HILL1500 1141h Aw"UC.SE,Bel}evw, MsJunE�<rn 4WN':
-1M,45 MOM
engineer,
planners
ecomm mts
s(Ientrsts
• • RECEIVED
� AUG 1 1 1978
G.kLKA ASSWIATES
k IVF,I NI N 1 tipV`x'lAW14
+rrnw.,rtl. .Ri rni Cen{ifti
Au: ust 10, :979
Mr. Konald I., J1sen
::tility cnaineer
City of Renton
200 Hill Avenu- bourn
Renton, 'Hashin„ton 1Ig055
bear Mr. Olsen:
Subject: Annual Ch:-ck of Cathodic Protection Systems
'It. Oliver Reservoir and
liirhlands tlevatad Reservoir
In accordance with our rece- it discussion, this letter is our
proposal to conduct the annual check of the cathodic protection
systems in the above-refer,.ncrd reservoirs.
This check will include re-energizing and adjusting the
cathodic protection system in the Mt. Olivet rebdrvoir, which
has been turned off for painting; of the exterior of the
reservoir.
Random stzinas of anodes and the zinc referen..a clectrodc in
each reservoir will be gulled and inspected. Thu potentials
of the reservoirs will be measured with respect to the
premanent zinc reference electrodes in each, and the ,ectitiers
will be adjusted as necessary to ensur,` adequate protection
levels.
A potential profile will be run along.; the inside wall of each
r,.r ervoir from rile rep to the bottom utilizin, :e copperlco er
sulfate reference electrode. This will be done to ascertain
that the protection levels area even and that no l•ij;h or low
spots exist.
The ammeter and voltmeter in each rectifier ,.ill be checked for
accuracy atainst a standard meter, and a circuit resistance
check will be -fade od each system.
r
`1r. Ronald L. Olsen
page -'-
August 10, 19'8
After the 'It. Olivet cathodic protection system is re-energized
and set, another check will be made in abuut 30 days, z.ivin;
the system sufficient time to polarize. Readjustment of the
system may be necessary at that t.im....
It is estimated ttat approximately two days will be required
m to perfor the services and field work as outlined. A written
repart covering; the testing accomplished will be prepared
and submitted. This report will contain the. data collected
and will 1nI.Iude recosenendati'Ins for future operation and
maintenance of the systems.
The t .>tal cost for making th, annual as d.,.acrio,-d herein
wili be $525.00. This inclu&., all labor, travel, office
work, and associated expenses.
We can be ready to perform these services within one week
after receivin', your authorization to proceed.
Thank you 'or the opportunity to discuss this tc,sti,n; and to
submit this proposal. We look forward to beinn of q:ervice
to you. Please do net hv�sitpte to call if you have anv_
questions or it we can be of service in any other way.
Very truly yours,
Henry Galka
Corrosion Engit,eer
ceg
YA I I
TO: Warreo Go o;:
,P* Dick Hcughttnn /X
---------------------------
For your signature..
For ywt approval,
for your iniurm Lt on•
REMAK5
i�ti RE.�
¢� # PUBLIC WORKS DEPARTMEN i
qq" �� ' "1�I ` ENGINEEHINl: 61Vi510N -1i =631
74 _ MUNICIPAL BUILDING M"LL AVE SO HENYON *ASI4 WES
Om P�
4'ro SE P'%�
04ARLES J DEt AURENT% iurust in, IUCN
MAYOR
Cali.a Ass0,1:1te5
CorToai.on Control Serv,c�'
P. 0. Box 405
Kirkland, NA 98013
Subject: Annual Check of i.:thcxlic PTutectiun Sy3t'
At, Olivet Reservoir and
High]ae�ds Elevated Seservoir
iewen:
1'h,s will be your, authorisation to conduct the annual check of the
cathodic protection �Vsteas in the Above-refe rcnced reservoirs par
your letter of Au,,ust 10, 19�5' the total cesT to he $525,00.
Very tjmlly yours,
public Works Pirectur
PMP
�-- FIHRi.\\ti P'dSI11S6TUY,HHHIH
V wi,,siitnll ant ndScr,wcs
November 30, i976
Mr. Ronald L. Olsen
Utility Engineer
City of Renton
200 ?fill Avenue South
Renton, Washington 98055
Dear Mr. Olsen:
Subject: Report on Annual Check of
Cathodic Protection Systems
Mt. Olivet Reservoir and
Highlands Elevated Reservoir
Pursuant to your authorization, the annual check of the
above-referenced cathodic protection systems was carried
out on August 26, 1978. This check was made in accordance
with our letter of proposal dated August 10, 1978.
The following is a summary of the testing and inspections
accompli+hed.
MT. OLIVET RESERVOIR
The cathodic protection system in the Mt. Oliver reservoir
was found to be operating. The rectifier output was
checked at:� the potential of the reservoir wall was
measured with respect to the permanent zinc reference
electrode inside the reservoir. The initial rectifier
readings and potential measurements are recorded on data
sheet No. 1 appended to this report.
The potential measurements showed very Food polarization
inside the reservoir, indicating that the system had been
Oil for sore time. (Before making the check, it was
anticipated that the system would have to be turned on
Mr. Ronald L. Olsen
oa5• -2-
November 30, 1978
and allowed to polarize for a couple of weeks before
:raking final measurements. This was anticipated because
ti:e cathodic protection system had been turned off
recently whiie the exterior of the .eservoir was being
painted. However, the system was apparently re-ener,.ized
by City personnel after the paintine was completed).
The current flow to the three rings of anodes inside the
reservoir way asured, as recorded on data sheet No. I .
1.is was dc.1, i measuring the IR drop across the shunts
in: ide the juu.tim box on top of the tank.
�t�i lc making these measurements, it was not.d Glat
several of the anode wire terminal-to-bus bar connections
were loose, and one of the bus bar studs was broken.
A11 connections were cleaned and ti.;ntened, and the
anode wire terminal on the broken stud was reinstalled
o.. a ;rood stud,
The output of the rectifier was main checked and the
current flow to the three anode rings was a_ain measured.
These readings and measurements are also shown on data
sheet No. 1 .
In order to ascertain that the entire interior surface
of the reservoir was receiving, adequate cathodic protection
current for control of corrosion, a vertical potential
profile of the reservoir wall was made. This was
accomplished by lowering a copper/copper-sulphate
iCu/CuSO4) rcfe.rence electrode into the water next
to the reservoir wall and recording the potential at:
the wall at 2-feet spacings as the reference electrode
was brought back u- to the surface of the water.
'nhe vertical potential profile, which is recorded on
data sheet N0.2, shows exeeilont potentials along the
wall of the reservoir, with no high or low potential
areas.
A visual inspection was made of two anode strings
seL cted at random anti pulled tram the •eservoir.
A three-anode string and a single anode string were
pulled and examined. The following pictures show
the anode strings tnat were. checked.
Mr. Ronald L. Olsen
pake -3-
November 30, 1978
1
O
Gicru.te No. 1 A thr,e-- ,Erill.
pulled from the Mt. 01, reservoir
on August 26, 1978 for inspection.
The anodes were found to by in vvn
Picture too. 2 ..
shown in Picture :
���
�K��:� _
� .,
� >
�a�;t�>
i..
. ��'
tt
S � ;
+�
��
t
1
1� >
Y.
. ..,. .... ... .. !i'�
,Sr. Ronald L. Olsen
Page -5-
Novcmbet 30, 19?1
In addition to nulling and checkinz the anode strings,
as shown in Picture No. :, the nenaanent zi,ic reference
electrode was also pulled from the reservoir and examined.
This e.<amination revealed that the reference electrode
lead wire had been oroken and the epoxy cap, whi,h
encapsulated_ and protected the lead wire-to-reference
electrode connection had been broken.
This damage probabl% occurred vh<n work was being done
inside the. reservoir late last vea:, oz during the
painting of the exterior of the reservoir this- year.
The broken wire had been repaired by splicin,; in another
piece of wi-e and soldering it to the re"erence electrod.,
:o- a rod, however, a piece of bare copper wire was
used and no repairs were made to protect the conmpction.
fhe bare copper wire and the exposed connection, in
contact with the water immediately adjacent to the
zinc reference electrode, were affect
tr._; the potential
measurement of the reservoir wall with respect to the
reference eiectrode.
Temporary repairs were made by wrapping the bare copper
wire and the .connection with several layers of high
voltage rubber electrical tape, cover,�d with several
layers of vinyl electrical tape.
The following pictures show the zinc reference electrode
it was found when pulled from the reservoir, and
after the temporary repairs were made.
Mr. Ronald L. 11sen
page -6-
November 30,1976
1'
➢lciurte No. 5 Zinc reference
electrode as removed from the
Mt. Olivet reservoir on August
26, 1979. Note the bare copier
wire spli::ed into the lead wir•±
where the lead wire had been
broken. Also, note the epoxy
cap missing;, w1r ch protected
tie wire-to-reference electrode
connection.
Mr. Ronald L. Olsen
page -7-
November 30, 197,.
P.icturte No. b Zinc reference electrode,
as shown in Picture No. 5, after temporary
repairs were made to the bare copper wire
nod the exposed wire-to-reference electrode
connection by wrapping with several layers
of electrical tape.
The rectifier voltmeter and ammeter were checked for
accuracy and a circuit resistance check of the cathodic
protection system was made. The voltmeter and ammeter
were cl -�cked against a set of standard meters with the
recti.fier operating at several different outputs. The
data from these checks are recorded on data sheet No. 3.
The rectifier voltmeter and ammeter were found to be
reading quite accurate, with very little adiustin, of
the meters required. The circuit resistance was low,
indicating that the entire system is in good condition.
While running the above checks, it was noted that the
rectifier transformer was quite noisy and that the
wires from t' e transfcriner to the terminal board inside
the rectifier were iuite hot. It is recommended that a
City electrician check out the transformer, the wires,
and the ac service to the rectifier for possible overloading.
Mr. Ronald L. Olsen
page -8-
November 30, 1978
HICH"NDS ELEVATED RESERVOIR
The cathodic: protection system in the highlands reservoir
was found to be operating. The output of the rectifier
was checked and the potential of the inside reservoir
wall was measured with respect to the permanent zinc
reference electrode inside the reservoir. These readings
are recorded on data sheet No. 4 appendec . ) this report.
As was done in the Mt. Olivet reservoir, a vertical potential
profile was made to ascertain that the interior surface
of the reservoir in contact with the water was receiving
adequate protection current for control of corrosion.
The results of this profile, which are recorded on data
sheet No. 5, showed excellent potentials along the
reservoir wall. The potentials are well above corrosion
control criterion, with no high or low potential areas.
The anode terminal junction box on top of the ilib�hlands
reservoir was checked. Several of the anode. cable-to-bus
bar connections were found loose, and two bus bar studs
were found broken. All connections were removed, cleaned,
replaced, and tightened. The anode cahie connections
on the broken studs were replaced on sound studs.
Cleaning and tightening these connections reduced the
circdit resistance of the system somewhat, and increased
the protective potential inside the reservoir, as
recorded on data sheet No. 4.
Several anode strings were pulled from the reservoir for
a visual inspection. All anodes were found to be in
excellent condition, as shown in the following picture.
Mr. Ronald L. Olsen
page -9-
November 30, 1918
Pictu.ae .4o. 7 Anode removed
from the highlands elevated
reservoir for inspection. This
anode is typical of several
chat were removed and examined.
All were found to be in excellent
condition, with considerable
servic life still left.
Mr. Ronald L. Olsen
page —10—
November 30, 1978
Following the inspection and repairs to the anode
junction box, the running of the vertical potential
profile inside the reservoir, and the examination of
several anodes pulled at random, a. check was made of
the rectifier voltmeter and ammeter, and a check was
made of the circuit resistance of the cathodic protection
system.
The rectifier meter check, as recorded on data sheet No. 6,
showed that both meters were reading quite accurately at
the normal operating level. The voltmeter was found to
be reading quite accurately at the higher operating
levels, while the ammeter was reading about 1 ampere low.
Since both meters were readin- quite. accurately at the
normal operating output, no adjustments wer, made to
either.
The circuit resistance of the cathodic protection system.
%I,s :alculated at 1 .29 ohms, as shown on data sheet No. 6.
this is somewhat lower than the �.ircuit resistance of
1 .40 chms, as r,caaured on July 11 , 1473, and shows
cxcell�nt system operation and polarization.
The rectifier output was left as found and as recorded
nn data sheet io. 4.
RECO%Di"DAT IONS
It is recommended that monthly checks and taonitorine,, of
Lite cathodic protection systems by City personnel be
continued. These checks are very important t., ensure
that the systems are functioning properly and that the
interiors of the reservoirs art, being well protected.
It is recomrcended that work be done in tLe anode cable
�unction boxes on each reservoir, to repair and replace
us bar studs and terminals as needed. With loose, dirty,
and broken centacts, cons'_;lerable efficiency and praroctive
power is last in cite systems.
It is recommended that consideration he given to kristallirg
new terminal blacks ie the junction boxes to replace the
rexistittg bus bars. It may be possible to eliminate rho
terminals on the ahudc cables through the use of new
tersmina. blocks, thus reducing loss of current through
louse and tarnished terminals..
Mr. Ronald L. Olsen
pae -11-
November 30, 1976
It is also recommended that a new zinc reference electrode
be purchased and installed in the Mt. Olivet reservoir to
replace the existing reference electrode which has been
damagei quite badly. Although temporary repairs have
been made to this reference electrode, the damage has
been such that the integrity of the reference electrode
is questionable. Since the proper operation and correct
output of the entire cathodic protection system depends
upon the integrity of this reference eiectrode, it is
recommended that the damaged one be replaced. The cost
of a new reference electrode will be about $40.
We will be pleased to assist you with the implementation
of these recommendations. If desired, we can make the
needed repairs to the anode ,junction boxes and replace
the damaged zinc reference electrode, or we can provid,
assistance to your personnel in making these repairs.
please do not hesitate to call if we can be of further
service, or if you have any questions concerning the
cathodic protection systems or this report.
Thank you for the opportunity afforded us to be of service
in this annual check.
Rcspectfully submitted,
GALKA ASSOCIATES
Corrosion Control�S�ervices
A
i!'nry 1`. Calka, P.E.
Currosior. Control En;;iaeerinn - - 4'e "J �'-
CATHODIC PROTECTION
�GALKA ASSOCIATES
STRUCTURE - TO - CU/CUSO4 POTENTIAL SURVEY
CLIENT—_S.-/TV OF a✓r0.✓ SHEET_- -OF 6
LOCATION_Mr. D4/✓E-T DATE_ /7
p TAKENRY L'H/
RECTIFIER LOCATION PUMJP KJ U.'C D/V�
RECTIFIER TAP SETTING f/S FOONQ VOLTS AMPS 'L'�94
RECTIFIER INTERRUPTED? yES
STRUCTURE TO CU/CUSO4 POTENTIAL REAOINC
TEST LOCATION
,�?7 RECT.OFF RECT ON VOLTAGE
SSE✓O<< -TO- ZiNL TEFEeBNCE -,0'67, ZS✓ -O. S'�O✓ I -(J.GSr
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TDT.fL
�.4'r'rE�'. LLGw.Vnl/5_ A•r0 .PEoq/A:/N/ -._ ___
-TE�'Mi�/A[J .�✓O .BUS B.4.Q_STyp7� ��
/PEG r/FiEQ GYrrour = 3Gr ,j(o,� F
OvrEe .t'iN4 = .30-S .4MOS `
CEN 7F< R/N!
INNEt' R/N!j S..S .1MOS
CATHODIC PROTECTION
�GALKA ASSOCIATES
— STRUCTURE - 70 - CUICUSOq POTENTIAL SURVEY
�f pp
CLIENT /�„ ^E'V�'p� SHEeT'Q OF G
LOCATION Mr OL/✓ET /C ESE[✓O/C DATE e126 7f
�Et°7/G/L Ab7EN7/./L Qe0P/GQ TAKEN 6V Nil• e7
RECTIFIER LOCATION SN PUHO •6'v/LD/�/e�
RECTIFIER TAP SETTING _ VOLTS —gJ'O✓—AMPS 447 p•4
RECTIFIER INTERRUPTED? NO
STRUCTURE TO CU/CUS04 POTENTIAL READING
TEST LOCATION RECT.OFF RECT. ON VOLTAGE
.B0�7Lk4 OF .PESE2✓O/•C —��'
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GALKA ASSOCIATES SHEET 3 OF 6
August 26, 1978
CITY OF RENTON
MT. OLIVET RESERVOIR
CATHODIC PROTECTION SYSTEM
RECTIFIER METER CHECK 6 CIRCUIT RESISTANCE CHECK
RECTIFIER METERS STANDARD METERS VOLTAGE RESISTANCE
VOLTS AMPS VOLTS AMPS RECT. OFF 4 V/I
10.0 10.0 11.0 12.2 2.2 0.72
17.5 20.0 18.5 23.0 2.2 0.71
25.0 30.0 25.5 33.0 2.3 0.72
35.5 45.0 35.0 47.0 2.4 0.69
TOTAL RESISTANCE 2.82 ,/L
AVERAGE RESISTANCE 0.71 Jh.
GALKA ASSOCIATES CATHODIC PROTECTION
STRUCTURE - TO - CU/CUSO4 POTENTIAL SURVEY
CLIENT /�T/y /SE/✓TUd SHEET—e._OF-�e-
LOCATION T„��KL A�✓OS_��SE.f✓O/.Q DATE-elullv
TAKEN BY—eo �Ir �A✓
RECTIFIER LOCATION QN ��/SEf✓0�4 LE(
RECTIFIER TAP SETTING_ �{S �/Foc dQ YOLK 9 f✓ AMPS `rG -f
(RECTIFIER INTERRUPTED?__ /ES
STRUCTURE TOCU/CUS04 POTENTIAL READI
TEST LOCATION RECT OFF RECT. ON Q VOLTAGE
E E4✓OK —TD- Z../C ,PEF��,,e-E — O - —O.3&r -O.3A✓7-0
�AF7t2! .PE�AiQ/Nr ANO Gc.c•.vN/.w .—
/I,IGGE lA pd LC TEYH�+/.ILS M� --
✓aNG 1J0 N �Li oK
_ I
,PESFXI/a/K—7Z�- Z.Nc /C�FE4EVCE -d,40✓
CATHODIC PROTECTION
�GALKA ASSOCIATES
STRUCTURE - TO - CUlCUS04 POTENTIAL SURVEY
l:ll ENi `-/ OF �ENTD.✓ SNEET .$- (;c-(p
LOCATION DATE
A-ler"C-IL f OTEVT/AL TAKEN BY
RECT FIER LOCATION G,/ /'csct✓p/.t r�S
RECTIFIER 'AP SETTING----VOLTS_ 2 ✓_AMPS 4• 97
RECTIFIER INTERRUPTED) Iva
STRUCTURE TO CUICUSOA, POTENTIAL READIN
pp TEST LOCATION RECT OFF RECT ON VOLTAGE
—U07/pH OF ✓E�ESEQ✓O�e �/,O(,✓
1.2
fro � I
o-/G - -- - --- -----F -/92✓.
/
0or
f z� � _ I -a.as✓
-
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—IT`
_^ GALKA ASSOCIATES SHLr f 6 OF 6
v C« - C�� August 26, 1978
CITY OF RENTON
HIGHLANDS RESERVOIR
CATHODIC PROTECTION SYSTEM
RECTIFIER METER CHECK 6 CIRCUIT RESISTANCE C1L:CK
RECTIFIER METERS STANDARU METERS VOLTAGE RESISTANCE
VOLTS A;mpi VOLTS AMPS RECT. OFF Q ViI
9.0 5.1 6.2 4.9 2.1 1.24
14.5 10.0 14.0 9.3 2.2 1 .27
21.0 15.0 21 .0 14.4 2.2 1.31
26.0 19.0 26.0 18.0 2.2 1.32
TOTAL RESISTANCE 5.14 an-
AVERAGE RESISTANCE 1 .29 +Jl-
I N E R C F F I C E _. _ F,
Pate-L. her ;t 197e
TC: Cliff Oavi �
FROM: Ronald Olsen
SVBA=
Attached herewith is a copy of the Annual Report of the Cathodic Prutrctiat
Systems Mt. Olivet Reservoir and Highlands Elevated Rc-servo Lr.
This is mycwly ,copy and i would like +t hack.
Pltvi,e review said report and flake note Of the on page 10.
If your section can handle the [rux.-;,cndatiuns please let nc snow and it you
can't we will then approach Caika Asscriatts to give us an rsLiea te.
Your eis"'e.,: atren[iw t„ Ellis matter would be greatly appreciated.
Kl 0.pmp
.0 E A D R A N D 4 N
DATE: October 23, 1979
70: Ron Olson
FROM: Cliff Davis, P,gnal/Comm Supervisor
$0BJECT. Repair to Cathodic Protection System
As per your request of December 26, 1978, the Annual Report of the Cathodic
Protection System by Calks Associates was reviewed and the following action
was taken:
Mt. Olivet Reservoir --
a. built and installed new terminal box for electrodes.
b. The referenced electrode was replaced.
c. A drain hole was drilled in the terminal box.
d. 411 connections were checked and repaired as required.
e. Inspected main power/control panel.
Pighlands Reservoir --
a. Replaced several broken studs in terminal box.
b. Checked, repaired (as required) and tightened connection in
terminal box.
c. Drilled drain hole in terminal box.
d. inspected main power/control panel.
Aft>r completion of work, both units were checked and found to be operating
normally. ]
GCD:ad
CH2M • •
IIHILU
�d.tnnri,
t•r unrnnnh
.t 4•nhd
February 17, 1982
9201.48
Mr. Ron Olsen
City of Renton
Municipal Building
200 Mill Avenue South
Renton, Washington 98055
Dear Ron:
A brief visual inspection of the interior of the Mt. Olivet
water storage tank was made on December 7, 1981. The tank
had been drained for maintenance work, and the internal coat-
ing and the cathodic protecton system were inspected in
cordance with your verbal request.
The coating on the tank wall below water has not deteriorated
significantly since the last inspection made by CH2M HILL in
1977. No active corrosion was noted. The calcareous deposits
are continuing to form on support columns and on portions of
the tank. wall. The coating on the overhead portions of the
tank does not appear to have deteriorated significantly since
the last inspection.
The cathodic protection system anode strings and reference
electrode are intact. Some deterioration of the anodes was
noted.
As we discussed, the cathodic protection systems on the
Mt. Olivet and Highlands water storage tanks should be checked
and adjusted. This letter includes our proposal to provide
corrosion engineering services in connection with a check :)f
both cathodic protection systems. The cathodic protection
system check would consist of the following:
i. Measurement of the reservoir wall-to-water potentials
2. Rectifier adjustment as required
3. Visual inspection of one anode string from each tank,
reference electrodes in both tanks, and the junction
boxes of both tanks
RECEIVED
FEB 2 21982
YNtk eeiw
1iA 1141h A11-11U1 91l1 vb 4s1 CM b a."
MUMS[XyW
Mr. Ron Olsen
Page 2
February 17, 1982
5201.48
4. Rectifier meter checks and calibration
5. Minor maintenance or repairs as required
6. Preparation of a written report summarizing the tests
with recommendations for continued effective corrosion:
control
We suggest a lump sum budget of $855 to complete the work
outlined above. We can begin this work within 3 weeks or
the City's notice to proceed. CH2M HILL will provide all
test equipment required to make the check. we will require
a ladder and keys from the City of Renton to gain access to
the reservoirs and rectifiers.
It should be noted that the coatings inside the Highlands
and Rolling Hills elevated tanks have not been inspected in
the last several years. We suggest these tanks be inspected
to determine the condition of the internal coatings. CHZM
HILL proposes to assist the City with this inspection by
providing the :ollowing services!
1. Visual inspection of the coating and tank walls
2. Coating film thickness measureme:ts
3. Coating adhesion checks
4. Pit depth measurements (if corrosion has occurred)
5. Preparation of a written report summarizing the inspec-
tion and including .ecommendations for coating repairs
or replacement and/or cathodic protection, as applicable
This inspection must be made when the tanks have been drained
and is best performed after the tanks have been cleaned.
To complete an inspection of the Highlands and Roiling Hills
interior coatings, a lump sum budget of $985 is suggested.
We can perform this work in conjunction with the cathodic
protection system check, if the City so desires.
Authorization for Professional services forms have been at-
tached to this letter. If the tasks in this proposal meet
your approval, please sign the Au•horization(s) and return
it to us. We will consider t) authorization for us to
proceed.
Mr. Ron Olsen
Page 3
February 17, 1982
S201.48
Thank you for the opportunity to present this proposal. we
look forward to bEing of continued service. if you have any
questions, please do not hesitate to call.
Sincerely,
Gerald P. 0uppong
Corrosion Control Engineering
Attachments
lslee
■Hl I CH2M HILL
AUTHORIZATION FOR
PROFESSIONAL SERVICES
CH}ta HILL OFFICE ADDRESS !SO') 114th Avtn Oate Febzuary 17, 1962
NAME Hater T ^a h
PAYE pdi p
'�—r«—+�3 F "h 4 .._vHQJ.CT 5201.68
Numsep —�
CLIENT.---Clty
of Penton _
ADDRESS Municipal Buildinor ZOO Mi 12 Avenue entons
Mrwv noun" and aothor,m CH2M HILL to perfrm me tohon,%
SCOPE:
Cathcdie protect:oa systes checr, and as
113taY2Lt in acrnraancg.wStn
T.,,__sco�+e of mark_outlined in_ptnC�+sn1 lettg 8ataa Flb .in y 7 1982
COMPENSATION to be on me bulE of
MISCELLANEUUS
Services covered by IME autl ontano. shag be DeHornrAd ;n aL[nrden<e w1h PROVISIONS shred _—
nn me bcl of thls farm.
ADprorwl for CLIENT
AdXYDIM for CM2M HILL
BvBY._.__,__..............- ._..._.__..__._..____...__.._
' TiNe_______
410 FORM!,an
PROVISIONS
1. Aotborhati to Proceed S. Termination
5gnpg this form shad be construed as Authorization Either CLIENT or CH2101 HILL may terminate fills
b� CLIENT for CH2M HILL to proceed on the work, AAhw.rzauon by gimp 3D days written notice to the
unHss otherwise broiled for n the aolholiZahon. other party In such event, CLIENT snail focthwitn pay
CH2M HILL in full for all work pravmusly authorized and
2. Sefary Cases performed prior to effective date of terminstiort If no notice
CH2M HILL'S Salary Costs shall be the amount of of lamination Is given, relationships and oblrgattom, created
salsnes pad CH2M WILL employees for work plebs m itf by this Authorization shall be terminated upon completion
on CLIENTS Project Pius a sbpuoted percentage of such of all applicable refounements of this Authorization.
salaries to cover all payrdl-rtlated texas, payfrwnis,
pernwms, and benefits, 0. Arbitration
All claims, disputes. and Mher matters in quell
3. Par Diem RaNs Arising out of, or relating to, this Autnorintron or This,
CH2M HILL'S Per Drem Rats are doss, fees published breach dyareof may be decided by afbibation .n accortlance
in each of CH2M HILL'S offices, which are hargi for with the ruin of the Amah, n Arbitration Association the
work performed on CLIENTS ProjeM by CH2M HILL obtasnirg. Esther CLIENT Or C142M HILL may initiate a
employees of the Iodinated classifications, request for such Arbitration, but consent of the other party
TO such procedure shall be mandalmv. No .rbltratom
g. Deraat Expamas arising our of or relating to this AudrOrintiorn may lit. _ice
CH2M HILL'S Doett Expenses shall be (hose costs By ;mroi,datsfn, joinder. or in any finer mlamer, a,
incurred on or dnechy for the CLIENT'S Prolect, inctoo. additional parry not a party to this Authorization.
1n9 but not limited to narkssary timspptatibn Webs
including mileage at CH2M HILL'S currant rate when 10,Lagel Expetlw
its auxiim lee s-e used, meals and lodging, laboratory In the event legal Achon is brought by CLIENT of
tests and analyses. computer se"ices, mapcard Ivpew itel CH2M HILL against the other to enforce any of the
services telephone pomp and rumiingomoges Rom. ob^getlons hereunder of along out of any dispute concbrn
bursement for these Expenses shall be on tf a basis of trg the terms and conditions haheby created, the losing
actual charges whin furnished by commai sources and Party shall pay The prevailing s rtv such reasonable amounts
On the basis of usual commercial changes when furnished lot fees, costs and expenses as may be set by the court.
by CH2M HILL
11, PeymerltIts CH2M Hill
5. outelde Saniws Monthly invoices will be issued by CH2M HILL for all work
when technical or Professional seryoas art fnrnishad performed under the terns of this agreement, invoices are
by a- outside source, when approved by CLIENT, an clue and payable On receipt. Fino""go.computed by a
additomm 5% shall be added to the cost of these sarvil.es 'Periodic Rate'of 1%per month,which is an annual percent
tin CH2M HILL'S administrative cen, ads rate of 12%(applied to the previous Vol balance after
deducting paymlm3 and credits for the co,rerrt monthl.will be
S. Cost Estimates charged on all past-due amounts umess otherwise pm.ded by
Any ever elhmaees prov-ded by CH2M HILL will be law or for contract.
on a bans of experience and judgment, but since it has
no csritrol over market conditions or bidding procedures
CH2M HILL cannot warrant that bids or ultimate consnuc. 12. limitation of Liability
lion costs will not very from That. cost estimates CH2et HILL's liahilny to the, CLIENT nor any cause
or combination of causes is.In the aggregate,limited to an
7. Prof ssynal Stsedeirds amount no Wester than;he fee earned under this agreement.
CH2M HILL shall he eesponsrble. tp the level of
mmpetemy presently maintained by other orachcmg
pofesS cost mrglnexs In the same type of work in
CLIENT'S community, for the poflulanal and technical
soundness, accuracy. and adequacy of all designs. draw
log;, fpevllicati om. and all.er work And matarWs futmsn
ad under tnn Authwitahon, CH214 HILL makes no Other
warranty, express or omplial.
�41LL CH2M HILL
AUTHORIZATION FOR
PROFESSIONAL SERVICES
Date rem- bn,a,y 17
CRgM WILL OFFICE AODRES6 1500_14th�averlue 8 .,.Ae11ea•b. aiA gBD.::e-__
PROJECT__internal Coating 7nspectien _ PFOJECT S201.48
NAME NUMBER �—
CLIENT, City,of Renton
ADDRESS Rw+icipal building, 200 Mill Avenue So., Penton, 87. 98055_
hereby requests and authpntes CH210 MILL to perfo,m the following services.
SCOPE:
coating inspection and r rt erenaration in accordance with letter_
_prxsal dated February 17.1982
CY
COMPENSATION to be on the bash of
< kJ
MISCELLANEOUS
S"u,covered by this auonwitebon Ihall be perfwr ecl in acco,dence with PROVISIom nano'
on the track of hi,, farm.
APtxoved to, CLIENT Ao-epted to, CH2M HILL
By____. __._.__—_—__..-.—.___.._ bv-....-___..____.
Title__
4 80 FORM 174A
rr"
CH2M • •
::HILL
cnku„ ri s FEB 7 N3
�ilanners
econornuts
suent,stn
February 4, 1983
5203.B0
Mr. Ron Olsen
City of Renton
Municipal Building
200 Mill Avenue South
Renton, Washington 98055
Dear Ron:
Pursuant to our recent telephone conversation, this letter
is our updated proposal for cathodic protection system checks
and coating inspections of City of Renton water tanks.
The cathodic protection system check on the Mt. Olivet and
Highlands water storage tanks will consist of the following;
1. Measurement of the reservoir wall-to-water poten-
tials
2. Rectifier adjustment as required
3. %,sual inspection of one anode strinc from each
tank, reference electrodes in both tanks, and the
;unction boxes of both tanks
4. Rectifier meter che:z,a and calibration
5. Minor maintenance or repairs as .required
6. Preparation of a written reiort summarizing the
tests with recommendations fer continued effective
corrosion central
We suggest a lump sum budcet of 5700 to complete the work
outlined above. We can t:c-�iin this , k within 3 weeks of
the City's notice to pruc:> d. CH2M HILL will provide aii
test ecuipment require:' t.c r:•:ake the check. We will require
a ladder and keys from the City of Renton to gain access to
the water tanks and re:_tifiers.
The coatings inside the Highlands and Rolling Hi...ls elevated
tanks have not been inspected for several years. Wt suggest
x.m<om e
,vknwo .�,.n„�a[ or!a•.a. .�,.:.,en, ,u,,u ;,r.,c :�x,n�
Mr. Ron Olson
Page 2
February 4, 1993
5203.B0
suggest these tanks be inspected to determine the condition
of the internal coatings. CH2M HILL proposes to assist the
City with this inspection by providing the following services:
I. visual inspection of The coating and tank walls
2. coating film thickness measurements
3. Coating adhesion checks
4. Pit depth measurements (if corrosion has necurredl
5. Preparation of a written report summarizing ie
inspection and including recommendations for coat-
ing repairs or replacement and/or cathodic pro-
tectinn, as applicable
This inspection must. be made when the tanks have been drained
and is best performed after the tanks have been cleaned.
To complete an, inspection of the Pighlands and Rolling Hills
interior coatings, a lump sum budget of 51,000 is suggested.
We can perform this work in conjunction with the cathodic
protection system check, if the amity so eepires.
Authorization for Professional Services forms have been
ttached to this letter. If the tasks in this proposal meet
,our approval, olease sign the Authorization (sl and return
it to us. We will consider this as authorization to proceed.
Thank you 'or the opportunity to present this proposal.. we
Look forward to being of continued service. If you
questions, please do not hesitate to call.
Sincerely,, /
Gerald P. 7uppong
Corrosion Control Engineering
1slkwla
Attachments
CH2M HILL
AUTHORIZATION FOR
PROFESSIONAL SERVICES
p,., tbruary_4, 1983. _.
c aM-ILLc<<,<E auoaEss1509_ _114th Avenue. SE, Bellevue_, WA 98004
rnaec, ,.Internal_Coating Ing_ct, gn o�.a�T 52Q1,42
NAME b-.✓eeF.A
CLIENT City of Renton
ADDRESS M!' is .ipal Building, 20,0 Mill Av,-lve so, RentoAl YA ..98055
heraSv raW.es4f Wkl auth M CH3M HILL W Wr Wl, me 1Wlow.np em.:iax
scoM
g __p_tion and report preparation i^ a:Cordance -.
lettar propos8l dated February 4e 1983
i
. ,
�.l CH2M HILL
AUTHORIZATION FOR
PROFESSIONAL SERVICES
pa,,.. February 4, 1983
C+Pn -IL: OFFICE >00PESS 1500_ 114th Avenue SE, Bellevue, wA 98004 __
.po,rcrWater Tank_Cathodic Proteciq� gysem h cg_ =F,c.,Ecr�y(�•aa_
4AUE
a+anBfa
CLIENT_ City of Renton
ADDRESS Municipal Building, 200 Mill Avenue so_, Renton, NA 99055
eer,o, ftq.-'as ImJ a.fhuq,tM CH2M HILL to Pr!ru.— I+,e fQuoa na arrv=ces
SCOPE
Cathodic protection system check and adjustment in accordance
with scope of work outlined in proposal letter dated
February 4 _..
COFMENSATWN m M on tt Wan oS ...__. ._._.__
$700 lump sum
M taeM+kFO=s j .=Inav!vuL+m.r .are Jure cnr6 C1+ -d:x t=x rr,,..4n aef I mel�. ;�1,, !ipre xfa+^d tq m"e.
of aM wfrirn.°a CH2M OIL I..I MMnnrat=M w hnr,
MISCELLANEOUS
Se+Ncn mwrM by th=e authl.c tanen mall I+s pprlr:rrvt; .n a+;+xyn,�nC.. alit PROMICINS
I Mr Wcti nJ p!,., fv=m
If CI_IE:%! At WWI taf CH24A HILL.
DATE April 7. 1983_ CITY OF RENTON P.O.No. b3 04 Z-
REOOISITION
DEPT. L'I,_,ility Eeaineerina
ACC'• 401/000/O1S 511 37 41 18___ S 700..�o VENDOR NO.
ACCT. __- 3 _ PHONE NO. 543-5000
VENDOR NAME AND ADDRESS VENDOR "REMITTANCE" ADDRESS
CH?M Hill Sam
Y. DESCRIPTION IN DETAIL AMOUNT.
gSEction �v� m rhark and ad_i_I •n �jn acc�rda.�r wj h c oDe of
_dated February 4 19R7 _—
]liyet Tank and
Highlands Elevarpfi Ro�ervoir
E ����
1 !"1 PURCHASINC TO ORDER AUTH. BY:
DATE_April 7. 1983_ C I T Y 0 F R E N T 0 N P,D.No. 3.3d4 J
RE9uISITION
DEPT. Uti1i X rnalneerinQ
ACCT. 401/QO()j015 507 3?,41,18 — $ I.000 00 VENDOR NO.
ACCT. _` _ _�_ _ PHONE NO. 543 —5000
—U&Y o4oaomu
VENDOR NAME AND ADDRESS VENDOR "REMITTANCE" ADDRESS
CH2M Hill
Y. DESCRIPTION IN DETAIL AMOUNT
a ing insoeLtiQn and report preparation in accordance with letter
proposal dated february 4, 19R3 to be inspected: _
Hiahlands Reservoir and Rolling Hills
1
,000.00
® PURCHASING TO ORDER AUTH. BY:�
WT7�- 10 stoaari, e Facto 11*4+'es
ENDING
F FIL
FILE TITHE
37 (
ca+i 0 A i C �12o'h2Cf r O N
4:P,3 Y11a; u-I� �ua �uce