HomeMy WebLinkAboutTask Order No. 0710a with Hydro Logic for Municipal Water Supply Well #20 Evaluation~~i~E IDIAN~--
Public ~ D A H O
Works Department
TO: Mayor Tammy de Weerd
Members of the City Council
FROM: Clint Worthington, P.E.
Staff Engineer
DATE: 10/21/2009
SUBJECT: WELL #20 EVALUATION
NOVEMBER 2.2009 CONSENT AGENDA
Mayor Tammy de Weerd
CIly Coaeail Meml~rfs
Keith Bird
Brad Hoaglun
Charles Rountree
David Zaremba
I. RECOMMENDED ACTION
A. Move to:
1. Approve the task order for Well #20 Evaluation with Hydro Logic, Inc. in an
amount not to exceed $11,583 and;
2. Authorize the Mayor to sign the agreement
II. DEPARTMENT CONTACT PERSONS
Clint Worthington, Staff Engineer (Project Manager)
Kyle Radek, Asst. City Engineer
Warren Stewart, PW Engineering Manager
Tom Barry, Director of Public Works
489-0349
489-0343
489-0350
489-0372
~~, ~ ~
Page 1 of 3
III. DESCRIPTION
A. Background
The City has recognized that the steel casing used in wells prior to 2002 is prone to corrosion and
associated water quality problems. In the last three years, Wells #17 and #14 have had to be
reconstructed and lined with PVC casing because of corrosive break-through of the steel casings
after as few as 9 years of use. The City is taking a preventative approach to steel casing wells
and evaluating their condition after 10 years of use. This evaluation aides in an earlier diagnosis
of corrosive breakthroughs which results in lower costs of reconstruction and increased water
quality.
Eight of the City's wells since 2002 have been constructed with PVC casing to eliminate the
problems due to corroding steel casings.
B. Proposed Project
This project is for the evaluation of Well #20. Well #20 was constructed with a steel casing 11
years ago and has been observed to have many of the same characteristics as Well #17 which had
to be reconstructed after 9 years.
IV. IMPACT
A. Strategic Impact:
This project meets our mission requirements to indentify and prioritize work to anticipate,
plan and provide public services and facilities that support the needs of our growing
community and ensure modern reliable facilities while maintaining financial stewardship.
This project is in line with our preventative approach of evaluating steel casing wells at ten year
intervals. These evaluations allow for the early diagnosis of corroded casings which in turn
limits service interruptions and reduction in capacity. Early diagnosis also decreases cost of
rehabilitation efforts.
B. Service/Delivery Impact:
Evaluation of Well #20 gives knowledge of its current condition and allows for rehabilitation
before potential breakdowns and reductions in capacity. Rehabilitation (if needed) reduces
service interruptions to customers and cost once breakdowns occur.
C. Fiscal Impact:
Project Costs
Consultant Agreement
$11,583
Project Funding
Enterprise Fund for Well Assessment $40,000
Page 2 of 3
V. ALTERNATIVES
A. The City could defer the evaluation of Well #20 and risk reductions in capacity,
service interruptions, and costly breakdowns
B. The City could choose not to evaluate Well #20 which would result in the same risk
of reductions in capacity, service interruptions, and costly breakdowns.
VI. TIME CONSTRAINTS
Council's approval will allow for the evaluation during the off peak demand season where the
well can be temporarily offline without service interruptions.
VII. LIST OF ATTACHMENTS
A. Consultant Agreement
Approved for Council Agenda:
f-=tA~ Tom Barry, Director of Public Works
~~ ~
Date
Page 3 of 3
TASK ORDER NO, 0710a
CITY OF MERIDIAN (OWNER)
AND
HYDRO LOGIC, INC. (HYDROGEOLOGIST)
This Task Order is issued by Owner and accepted by the Hydrogeologist pursuant to
the mutual promises, covenants and conditions contained in the Agreement between
the above named parties dated February 18, 2007.
CITY OF MERIDIAN
MUNICIPAL WATER SUPPLY WELL N0.20 EVALUATION
PURPOSE
The Hydrogeologist's scope of services, time of completion and compensation shall be
as set forth herein. Services shall generally be described as Hydrogeologic Consulting
Services per the Consultant's proposal dated October 8, 2009.
The City of Meridian recognized in 2002 that the steel casing used in its municipal
supply wells- was prone to corrosion and associated with water quality problems such as
staining and encrustation. City Well #19 was the first water well completed using PVC
plastic wel6 casing in July of 2002. Eight of the City's supply we{Is have now been
constructed wi#h PVC casing. Since the change in well casing materials, it has become
apparent that the City was correct in its assessment of the lowered quality of off-shore
steel and in the last three years, Wells #17 and #14 have had to be reconstructed and
lined with PVC casing because of corrosive break-through (holes) of the steel casings
after as few as 9 years of use, an expensive and difficult task.
Although the City took pre-emptive action to address the observation of premature
casing failure, it now needs to look back at its wells completed prior to the use of PVC to
evaluate for corrosion to take preventative actions if accelerated corrosion is observed.
Hydro Logic, Inc. has observed that Well #20 has many characteristics, such as drilling
method, bentonite seal material, and groundwater geochemistry,. as Well #17 which
recently had to be reconstructed. Additionally, Well #20 is only two years alder than
Well #17. The City has asked HLI to develop a scope of work to evaluate Well #20
during the fall of 2009 after the high water demand season is past.
TASK 1.1 -CITY WATER WELL NO.20 EVALUATION
Per the City's request, Hydrogeologist will: 1) conduct ashort-term hydraulic test of the
equipped well as baseline data for specific capacity and for comparison to the original
specific capacity, 2) review previous down hole television surveys of the well, 3) place
protective sheathing as needed vn the building and roof to prevent damage, 4) tarp
inside walls and protect well head plumbing as needed, 6) schedule and oversee
removal of the pumping plant and have it inspected for wear/corrosion, 6) clear the water
column and video inspect the 11-year-old well, 7) design cleaning program, 8) develop
bid schedule, obtain quotes,. and engage driller, 9) oversee and direct the contractor's
work, 10) video inspect the cleaned casings and well screens, and 11) develop a brief
technical memorandum to the City with conclusions and recommendations. Other
deliverables would be a copy of the well videos on compact disk and several down-hole
still photographs of the inside of the well showing before and after.
The Owner will provide all available information necessary to conduct the evaluations
and develop submittals.
Hydrogeologist will perform field surveys for evaluations and will serve as the liaison
between the drilling contractor and the City to obtain cost estimates from contractors and
to develop contractual agreements and technical specifications for the work.
Hydrogeologist will inspect all tools to be inserted in the well prior to insertion.
Hydrogeologist will ensure that all instruments, tools, cables, water tanks, hoses, and
equipment used in the well are disinfected and cleaned (including heating of pipe and
pumps that cannot be properly disinfected by other means. Hydrogeologist will develop
any necessary change orders to the work and keep the City regularly updated with
respect to the work. Hydrogeologist will also serve as inspector for the City with respect
to the work including review of contractor invoices. The Hydrogeologist's scope of work
and general approach to the project is described in detail in Attachment A.
Hydrogeologist will work closely with the City's Public Works Department and the City's
Water Department with regular a-mail updates.
TIME OF COMPLETION
Hydro Logic, Inc. can commence this work on the day after City approval. The
contractor portions of the work will require two-to-three weeks at the outside. A goal of
having the technical memorandum with recommendations completed within a month is
reasonable.
COMPENSATION
The Not-To-Exceed amount for this Task Order No. 0710a is eleven thousand, five
hundred and eighty-three dollars without any contingency fee ($11,583). The hourly
rates for services and direct expenses is attached (Geotechnical Services Spreadsheet -
Attachment B) and by this reference made a part hereof.
CITY OF MERIDIAN HYDROGEOLOGIST
BY:
a
TAMMY d EERD, MAYOR ED SQUIRES, YDRO LOGIC, INC.
Attest: ; ~ G~~ ~qy %,~
.,
\~G TFO
~E~~
J CEE OLMAN, CITY CLERK ~ ~a~ c
90 T ~s~ • ~,
~~
~~~hii~~~ ~~~~~~r~~~
.~o , I,~
1002 W. Franklin Street Boise, ID 83702 (208) 342-8369, (Fax) 342-3100, h dy rologicngwest.net
October 9, 2009
Attachment A.
Mr. Kyle Radek. P.E.
Public Works Department
City of Meridian
33 East Broadway Avenue
Suite 200
Meridian, Idaho 83642
Geotechnical Evaluation, Testing, and Inspection Services
for the City of Meridian's #20 Municipal Sapply Well
Dear Kyle:
I have developed a scope of work, and estimated costs to work with the City on the
evaluation and inspection of the City's #20 supply well. The well was constructed 11
years ago and has had the same pumping plant with no well maintenance over that time
period. Of especial concern to the City is the observed occurrence of severe corrosion of
steel well casings in the Meridian area and that at least two of the City's water supply
wells have required expensive reconstruction within the last two years that might have
been avoided (or at least made easier and less expensive) by an earlier diagnosis. In
particular, Well #20 shares many characteristics with Well #17 which was one of the wells
which has already required reconstrucrion. Beyond the primary reason for evaluation of
the City's steel cased wells, it is generally recognized that rehabilitative maintenance of
water supply wells is best carried out on a 5-to-10 year frequency owing to improved
redevelopment results and lower costs of redevelopment by not waiting until a significant
reduction in capacity does occur. Additionally, the City does not want to repeat the
interruption to major well production in an unplanned way during peak demand season
when most break downs occur and when it is more difficult to schedule contractors. It is
our experience that the encrustation that forms on the inside wall of the steel casing
promotes corrosive breakthrough if left alone. In any case, it behooves the City to
attempt to identify the contributing factors to this corrosion by study and detailed
observation and to take steps as necessary to avoid expensive reconstruction of wells.
It has been our continued experience that wells in service for this length of period will
have significant encrustation of the inside walls of the steel casing that will preclude
inspection for corrosion until the casings are cleaned. Indeed, it is under the thickest
nodules of encrustation that the most extensive corrosion appears to occur. Our general
approach is hands-on with concerted efforts to: 1) prevent damage to the existing
infrastructure, 2) to ensure disinfection of all tools, instruments and equipment to be used
in the well, 3} to prevent the occurrence of iron bacteria, 4) to secure and prevent down
hole damage to the well, 5) to document procedures, and 6) to obtain the best value for
the City from its contractors and consultants. By following these procedures for the last
15 years, we have not observed iron bacteria or any other bacterial problems in Meridian's
wells even though these problems are common in the other Valley municipal systems.
I have tabulated the costs to complete the work as a single project on the attached
spreadsheet. The cost estimates are considered maximum amounts and I would
recommend a 15~ercent continaency owing to the inherent unknowns of subsurface work
and older well construction.
We stand ready to commence the work right away and to proceed continuously to
completion of the project without interruption. The following narratives correlate with the
spreadsheet tasks to explain, in more detail, the scope of work.
1 Review Existing Data and Conduct Short Pumping Test
Existing hydrogeologic data, hydraulic test results, the details of well construction,
videotapes, field notes, and groundwater geochemistry will be reviewed and evaluated.
This task includes a site visit to conduct a short draw down test of the well, measure non-
pumping water level, and to document field-measured waxer chemistry parameters• These
data will be used as baseline data to compare to the original pump-testing and specific-
capacity of the well and, also, to gage the effectiveness of any recommended re-
development procedures. This pumping test will allow Performance evaluation of the
installed pumping plant. ($ 778)
2 Protect Building and Facilities
Over the years, we have realized that protecting the pump house buildings during well
maintenance and pulling/installing pumping plants is far more effective than having to
repair damages after the fact. The heavy and long well tools and inexact controls on well
rigs generally cause damage not too mention staining from lubricants, bailed materials, etc.
Because the tools must be inserted and withdrawn through the roof hatch, there is much
opportunity to damage the asphalt shingle roof, metal siding, and block exteriors. On the
inside of the building, the existing plumbing, wall Paint and controls are easily damaged
and soiled without basic preventative measures that are easy to effect. We have not had
any damages since itnpletnenting these procedures several years ago. Cost includes
removal of sheathing at the end of the project ($ 1,783)
3 Quote, Hire, Schedule, and Oversee Pumping Plant Removal and Inspection
A quotation will be obtained from pump contractor and arrangements made to remove,
transport, and store the existing pumping plant. Depending on the condition of the plant,
recommendations for sale, storage, or rebuilding/maintenance of the pump will be
developed. We feel it is important to have an inspector an site as the plant is removed to
directly inspect conditions/operations and to direct the contractor. ($ 658)
4 Conduct Video Inspection of the 11-Year Old Well
This includes a thorough underwater video inspection of the entire inside wall of the well
including casing and screens prior to any work on the well. Arrangemerns will be made to
clear the water column to ensure the best picture. The videotape will be reviewed, copied,
and submitted to the City with a complete set of field notes, down hole still photographs,
and a short one-to-two page memorandum of observations. Pre-inspection is an essential
task in any well evaluation that any consultant and/or cornractor should insist on prior to
any work to 1) be able to design the most appropriate cleaning program without damage
to the well, 2) to avoid any liability issues from pre-existing conditions, and 3) because
such an inspection is vital to understanding the down hole conditions for the long term
development of the City's well maintenance program ($1,008).
5 Design and Specify Cleaning Techniques.
Based on review of the video inspection and well construction, HLI will specify an
appropriate well cleaning program to convey to the well contractor and from which to
develop a bid schedule of work. ($ 415)
6 Develop Bid Schedule and Engage Drilling Contractor.
A bid schedule will be developed and quotes obtained from the appropriate experienced
contractors. Costs will be obtained from the mast qualified candidate for all possible
scenarios so that prices are not developed during the project. Sketches of effective and
non-damaging tools will be developed, discussed with the contractor, and inspected by
I-II.,I prior to insertion in the well. ($1,500)
7 Oversee and Direct the Field Work, Re-Testing, and Clean Up
HLI will remain in daily contact with the drilling contractor and make site visits as deemed
necessary. This task includes the scheduling, oversight, and documentarion of the
contractor's work including site visits, tool measurements and disinfection, documenting
materials and hours, and obtaining samples of scrapings from the well for potential
analysis. The cleaning program and/or down hole tools may be adjusted or changed based
on actual encountered conditions. Containment of bailing, mud, etc will be looked after
and the site kept as clean as possible. Final clean up to pre-existing conditions will occur
at the end of the project. Appropriate disinfection of all tools and equipment will be a
priority. Great attention will be given to the security of the open well and site throughout
the project. The disinfected pumping plant will be re-installed in the sterilized well and a
short pumping test conducted to compare to the baseline test data. Weekly project
updates will be made to the City by a-mail. ($ 2,938)
8 Conduct Video Inspection of the Cleaned Casing and Screens
Immediately following the cleaning, the water column in the well will be cleared and a
comprehensive side-viewing and axial-viewing vide inspection will be conducted.
Special attention will be paid to areas of juxtaposed dissimilar metals, welded joints, the
tailpipe and other areas of the well that have been shown over time to be vulnerable to
corrosion. Survey will verify nothing was dropped into the well and that no damage was
imparted to the well. Again, disinfection of all down hole equipment, cameras, well tapes,
and the well itself will be looked after as necessary. ($ 1,478)
9 Develop Technical Memorandum With Documentation
A short technical memorandum will be developed describing the accomplished work with
conclusions and recommendations. Deliverables include a compact disk of the vide
surveys, field notes, water level measurements and down hole still photographs for the
City's files. ($ 1,100)
Respectfixlly submitted by:
Edward Squires
Hydro Logic, Inc.
4
r
~~y
F~~~yyI
~1
y~
vMi M
n
v°°i 00
$
~ O
v OO
rn 00 O
F U ~ .. ~ ~-+ ~ p
^~ N ^" ~-' '~
~ cap ct3 t~s va rs3 ~
~i
~ O
v=
~ [+1
~
son
~ ~
~ M
~
°~
O
F
W '.
~ ..r
~!
~
~
~ ~
~ ~ ~ ~ N
ff9 ~ ~ b09 N
fR ~ ~
f/4
a a
b
a a
O ~
G ~
W
~ o v~
o
g
°
o~
o
°
~ 0
o
~
d ~ ~ ~ ~ o
o
~ se ~ ~ ~
~
~
o
~ ~ ~
~
~ o0
o
• ~
p
a.+
V ~ ~ ~ N N N N O O N N O N
~
A ~ c
~ ~ ~ ~
~ OS
O to
<f
~
~n
N
~ o
v~ 0
en
~ 0
~ ~
~.
y
S W H ~ ~ » ~ -~
~s ~i
~
~ ~
W ~
oA3N ~~ s
a ~
_a
~ GL y, _
o
b
~ ~
r.
o
0
o
N
o
v
r.
o
00
b O. k,
~
a ~ x
a ~
~ ~,
,o .9 ° ~
''a~~ ° g
~~
~
~
~ s
s
o
x ~ ~ ~ o ~ ~
~~~ ~~ ~ ~
+.~ pQ 0
L Q+ ~a
w
•
~
U
~ v o
N_
s
~
~
~
~"~ &
W
'O
CO ~ ~ p
p N N •--~ 00 ~O N o0
QQ
x
'~ ee ~"
W ~U '~ "'
y ;~' eu
~
~ H
..r
a C ~ ~ a
3 ~ ~
. a ~ ° $
~ ~ ~ ~ ~
A
~ ~ ~' .~
,..,
~r
3
E"" ~ tL ~ ~ ~ S
~ c ~ ~ ~ c ou
S ~
~ ~ ~
3 ~ ~
U ~ ~ ~
~ ~
5 '~ p
.y
~ NO ~ y~QO; W
O
R
' ~ ~ q
~ ~ ~ X
1
I
1
i
~-+ N t+f a' g
L-i ~ l~ 00 O~
Page 1 of 2
Ed Squires
From: Ed Squires
Sent: Friday, October 09, 2009 9:47 AM
To: Kyle Radek
Cc: Tom Barry; Warren Stewart
Subject: 10-9-2009 Task Order for Evaluation of Meridian Supply Well #20
Attachments: 10-9-2009 Task Order No. 0710a City Well #20 Evaluation.pdf
1002 W. Franklin St. Boise ID 83702 (208) 342-8369 Fax: (208) 342-3100 Cell: (208) 631-6781
Kyle,
Attached above is our proposed Task Order 1Vo. 0710a for the evaluation of City Well #20. I included a
brief description of our general approach to these types of projects based on our experience with the
redevelopment and evaluation of hundreds of wells including such work on virtually all of the City's
municipal wells.
Although we prefer to "open up" wells only when necessary (because of the potential for damage and
bacterial contamination that is always present), we are greatly concerned about our observations of steel
casing corrosion in the City's (and many other water system's) steel-constructed wells prior to switching
to PVC plastic wells. To better understand the causative factors, and to pre-empt expensive
reconstruction projects, we recommend an aggressive program to inspect and evaluate the newer steel
cased wells. We also advocate rehabilitative maintenance for wells on a revolving basis (rather than
reactive measures when production is impaired or interrupted during the high demand season) within a
5-to-10 year interval. The wells in question, here, are towards the end (or past) of this time frame.
Although the newer PVC wells are expected to have significantly less encrustation and no corrosion, the
steel cased wells completed within the last 15 years are, in our opinion, at high risk of corrosive break
through. It has also been show that pumping plants that are not run to failure can often be refurbished
for an extended life.
What sets our approach apart is ahands-on philosophy of active involvement. We have seen the spread
of iron bacteria in many water systems (mainly via unclean drilling tools and tanks of contractors) and
we are proud of our record with the City's wells where we have not observed such bacterial problems
over a great many years and a great many wells. We believe there is always room for improvement of
methods. Just because a drilling contractor has a long term record of well rehabilitation does not mean
to us that 1}they are qualified or 2) that they should be essentially unsupervised to accomplish the
work. The potential for damage to wells is high enough that an extra set of eyes (that are not focused on
the controls} is warranted. We also pride ourselves on good quality documentation for future and to ever
improving methods.
We could commence this work tomorrow with your approval and estimate the project would be
completed in one month from the start date. I have spoken with the Water Department and it appears
that taking Well #20 off line is not a problem at this time of year. Although we are hopeful that Well
#20 is in good condition, we recommend an early start for this project (now) given that we have the
possibility of having to do additional work to the well after inspection that could run into many months
if we would be so unfortunate to discover Well #17-type problems. Based on our on-going research and
observations of the current rash of casing corrosion problems in the Treasure Valley, we are very
10/9/2009
Page 2 of 2
interested by the fact that Well #20 does not have the typical VFD setup as many of the other wells and
whether this could result in a different corrosive environment.
In the event that we do discover corrosion, we feel well qualified to make recommendations for
preventative measures to arrest further corrosion and/or to effect some reconstructive work while
maintaining the productivity and yield of the well (we have actually improved yields on the
reconstructed wells so far). We also have the in house capability of down hole cameras and geophysical
probes that are necessary to such work without waiting and incurring additional expense.
I have attached a pdf-format version of the Task Order and Attachment (above) but I am sending the
originals to your attention by today's US mail.
Ed Squires
10/9/2009