HomeMy WebLinkAbout1997-06-25-NORTH RESERVOIR INSPECTION AND REPAIR REPORT d.'.Om1rlaRial>a,�w ceraaa«�
June 25, 1997
Mr.Larry Woodward
Water Utility Division
City of Bozeman
P.O. Box 640
Bozeman,MT 59715
RE: North Reservoir Inspection and Repair Report
Dear Larry:
Enclosed are two copies of the inspection report on the North Reservoir. As we discussed, it
includes the following information:
• Written inspection report
• Color photographs of specific discrepancies
• Information respecting two possible structural roof alternatives
• Estimated costs associated with the two roof alternatives
• Estimated costs to engineer a foundation and footing system for a roof structure
If you have questions regarding any of the enclosed information, please feel free to give me a
call. In the mean time if it would be helpful for me to make a presentation to city management or
the council, let me know. We welcome the opportunity to assist you in any way possible.
Sincerely,
LIQUID ENGINEERING CORPORATION
Wayne Dykstra
President
WDleas
Enclosure
V
2484 Overland Avenue PO.Box 30027 Billings,MT 59107 800-438-2187-406-651-0105 Fax 406-651-0120
MEMBER: American Wale•r VMorks Assoeiaflon-National Aeaociatlon of Corroslon Engineers•Steed SaurxYre n 9 Painting Council•National Assoaaaan of Miumne Cordractors and Operators
American Welding Society•Assooation o/OiMng Ca 4—tors•Association 00 General Contractors•National Rural Water Associeaon
interoff ice
M E M O R A N D U M
to: Larry Woodward
from: Ray Hedglin
subject: Norhhside Useage
date: July 23, 1997
Larry, this is a memo on your request of the northside water useage for the summer
months of,June, July, , 1997.
June, 1997 199430 cult
July, 1997 370600 cuft
Aug. 1997 422780 cult
�S
interoffice RECEIVED JUN 3 0 19:
M E M O R A N D U M
to: Phill Forbes, Director of Public Works
from: Lam,Woodward, Superintendent of Water/Se
subject: North Reservoir Cover
date: June 27, 1997
Enclosed with this memo is:
1. Copy of memo from Dave Mel] dated 6/20/97
2. Copy- of detailed report from Liquid Engineering dated 6/25/97
3. Copy of Montana Drinking Water State Revolving Fund Loan Program.
I would like to meet with you at your earliest convenience to discuss future plans for repair and/or
replacement of Lyman Creek Cover. The enclosed memos and reports are quite lengthy and will
take some time to digest. The bottom line is that the cover is very near complete failure and
should it fail we will be faced with a contamination issue and probable boil order.
Liquid Engineering's report advises the Water Dept. to inspect and repair at a minimum interval
of 60 to 90 days. We have just completed cleaning and pumping operations 6/27/97, and have
identified approximately 6 more leaks, after only 30 days since Liquid Engineering's last repairs.
In my opinion the cover is no longer serviceable, and poses a real threat to the safety and welfare
of the public being served by the reservoir.
My recommendation is to take Lyman Creek Reservoir off line and feed the north side system
with south side water until a permanent solution can be reached. As a Certified Operator I feel
the potential for contamination due to algae growth and animal feces should dictate proactive
measures instead of reactive.
In addition to the contamination issue the controls at Lyman Creek are still not on-line, due to the
lightning storm_ Equipment has been ordered for repairs, but I question the validity of spending
more labor and material on something that has failed.
Preliminary numbers for an alternative cover are included in Liquid Engineering's report and do
not look very favorable, budgetary wise. It may be time to consider a new storage tank or
package treatment plant of some kind_ Should another tank or plant be considered, the State
Revolving Fund could possibly be a source of money for construction costs. I have enclosed
information with this memo on the Drinking Water State Revolving Fund.
I will look forward to meeting with you to discuss how we should proceed.
Thanks in advance.
cc: Dave Mell
THE CITY OF BOZEMAN
814 K BOZEMAN AVE. P.O. BOX 640 BOZEMAN, MONTANA 597-71.0640
# F t PHONE (406) 582-3200 FAX (406) 582-320I
CITY SHOP COMPLEX
88 j'
walk ca 0
To: Larry Woodward. Superintendent Water/Sewer
From: Dave Meil MEMOMHOUM
Subiect: North Reservoir Cover
Date: June 20, 1997
As a Ovate= operator for the City of Bozeman, 1 would like to bring the subject of the North
Reservoir cover to your attention, Th€s cover was installed un the last half of l9$9. 1 believe
this cover was installed improper y from the beginning. We have spent tens of thousands of
dollars paving Li id Engneerng bring the bade down to the floor where it belonged, and
making various other repairs to holes, tears, etc. I 'bel.eve the integrity of the material has
deteriorated to the point of failure anytir ne in the near future. Support tabs are tearir4g and
water is leaking up from the bottom hrough holes and tears and accumulating on top of it.
Snowfall and ra hall also accumulate on top, creating a ;harsh-like appearance. As a water
operator for this city, l would beeembarrassed for the general public to see it, rrot to mention
the State Departrnent of'nvironmental Quality.
This reservoir is rewired to be covered for common sense reasons as wall as regulatory
ones. I believe it would be in the city's best interest to aggressively look at some form of
replacernent for this cover. Fail�ijre of this cover may not be noticeable from the top given the
way water is continuously accumulating. in addition to the problem, it has turned into a
resort for ducks and geese year round because the water on too don't freeze in the winter
due to the water temperature u nde meath a, deedless to say, water fowl don't travel feces
free, nformi Gately 't is very conceivab`e that our Eac T testing in the distribr.-ber; system is
the way we would end out thaz it has failed, This could ve,7y realis`caliy create boil orders for
this CO-nmunity and h 3ea,,h hazards for its reside.
h`rn not sure of the exact rice we paid for Ns cover, blot it had to have breen several hundred
thousand at a minimum, For just over a seven-year life, I don't feel we goz a very good
return on our r noney. I believe that alternate options for a new cover should be reviewed
before we consider replacing it with the same.
As we all know, the public's trjst and confidence are very difficult to eon;. It would be a
shame to lose it over a situation that hopefully can be avoided. I hope t pis problem will
receive the anent=on it deserves.
T hank you for Iis'ening to my concerns regarding,his situation.
DM/cd
cc: Phi11 Fort-es, Director o=(Pubic Service
HOME OF MONTANA STATE UNIVERSITY
GATEWAY TO YELLOWSTONE PARK
+>-I0NTAJVA DRINKING TVA TER
WIN STATE REtVLl/f.VG FVAD L 0-4 N PR 0 GRA At
FACT SHEET
FLIGIBILITY: All community systems and nonprofit noncommunity systems are eligible for loan assistance.
House Bill �483 amended the Montana Drinking Water State Revoly.g Fund(DW SRF) (originated in
1995 legislature)and incorporated amendments made to the Federal Safe Drinking Water Act which was passed
in August, 1996_
TYPE OF ASSISTANCE: T�Ws of assistance currently provided are: direct loans and project refinancing.
TERINIS: The interest rate is estimated to be about 4.0% with payment schedules not to exceed 20 years-
Disadvantaged communities are, eligible for loan terms of up to 30}years and the loan term cannot exceed the
design life of the project_
APPLICATION: Applications l ill be available,from the Montana Department Environmental Quality- All
loan projects must be placed on the project priority list (PPL) %vhU ranks projects according to environmental
impacts or severity of public health hazard. The PPL is updated annually. Loans VVIII be offered an a first-come
basis unless demand exceeds available funds. Ultimately ranking will be based on water quality and/or public
health impacts and financial need. -
FUNDS AVAILABLE: The DW SRF loan program is capitalized-,vith federal assistance in 1997 iNith an
appropriation equaling 14.8 million dollars_ The state must provide a 20%match which'Will bring total available
funds to 17.76 million dollars_ The main difference between tl e existing wastewater SRF' and DW SRF is that
the DW SRF program has provisions for the state to provide a--ids to various"norf-project" activities or"set-
asides". These sct-asides include source water protection. source water assessment; capacity. development
(viability). wellhead protection, operator certification, small system techrn cal assistance and a loan subside
program far small,financially 6sadvantaged communities. The set-aside determinations hate)°et to be fmalized
and match provided for the set asides. All loan principal and interest pa.Nmcnts must be credited to the state
revolving Izand as well as interest eamings within the fund itself. The prob am is designed to provide a perpetual
source of financial assistance to Montana communities. Of the combined state and federal funds,
approximately 15 million dollars would be available for drinking water loan projects.
REGULATORY REQUIRE TENTS: Loan proiects are subject to both federal and state laws, including
federal labor standards;environmental reviews. and minority business requirements for loan projects funded with
federal funds. A facility. plan xith a detailed environmental assessment of the proposed project, plans and
specifications, adequate construction rnanagernenL and proper startup and operation of the facilities )VIll be
continual requirements of the progam.
I997-98 PROJECTS: If your Oornmunity anticipates that it u-ill need drir~.king water project funding and wants
to be eligible for DW SRF loan in 1997 or 1998,please send us a letter requesting that your project be added to
the 1997 Project Priority List. If a project is not on the. PPL. it is rtat eligible for funding.
CONTACT PERSQN: Barbara Neuiverth
Montana Dcparunent of Environmental Quality
State Revoll ing Fund Loan Program ;
1520 E. 6th Avenue. P.O. Box 200901
Helena. MT 59620-090I.
Phone(406)444-5 322: Fax (06) 44 4-68?6
�' iteviscd:-6g7
Repair and Inspection Report
of the
North Reservoir
for the
City of Bozeman, Montana
Repairs and Inspection Completed
by
Liquid Engineering Corporation
Billings, Montana
Job No. 1821
City of Bozeman
North Reservoir Inspection Report
INTRODUCTION
Follov.-ing is narrative and photographic summary of inspection and repair activities
undertaken on a 6,000,000 gallon potable water storage reservoir owned by the City of
Bozeman, Montana, and referred to as the North Reservoir. This inspection included a
visual and photographic record of findings and repairs undertaken from -May 30 to Tune
1, 1997, by Liquid Engineering Corporation (LEC) of Billings, Montana. (See Appendix
A for documentation)
The North Reservoir is a 250' x 156' rectangular in-ground concrete lined potable water
reservoir of conventional design, with a floating mernbrane cover constructed of high
Density Polyethylene (HDPE) and Hypalong. It is the installed floating cover that is the
primary focus of this report.
The repairs described in this report are a completion of work that began in the fall of
1996, and completed this year.
METHOIIOLGY
The reservoir interior was inspected by a surface-supplied commercial diver encapsulated
in a sealed dry suit mated to a sealed diver's hard hat. The diver was equipped with voice
communication as well as a real-time live color video feed to the surface support team.
All procedures were carried-out in accordance with Liquid Engineering's Standards and
Procedures. All inspection and repair operations (including pre-entry decontamination
and disinfection) were conducted in strict accordance with all applicable ANVWA, AINSI
and OSHA Standards and Recommendations,
This narrative report is part of a complete documentation package consisting of an
inspection video, 35mm still photographs, drawings and checklists. Copies y of the
inspection worksheets and video were provided to the City of Bozeman upon completion
of the repair operation. The balance of the inspection documentation, and associated
findings, are attached to this written report.
FINDINGS
Interior Examination
Interior Concrete Floor and WaUs--By dye testing the concrete floor and sloped walls,
a small number of pinhole-sized leafs were identified. All of these pinhole leaks were
repaired utilizing NSF 60 Certified underwater epoxy. After completing the epoxy
repairs, no further leaks were detected; this was subsequently confirmed by dye testing.
A detailed visual inspection of the condition of the concrete floor and associated
expansion and construction Joints was undertaken prior to beginning repair of the floating
cover. There is no visible settling; cracking, spalling or erosion to be found anywhere in
the floor structure or bermed (sloped) walls. Indeed, the floor appears to be in excellent
condition, with no noticeable deterioration over the past five years that LEC has been
regularly inspecting this reservoir.
HDPE Baffle & Installed Chlorine Diffuser — The baffle is in position and intact.
Overall condition appears to be excellent.. The chlorine diffuser pipe remains in proper
position and continues to operate in a normal manner.
Inlet, Outlet & Floor Drain — Both the inlet and the outlet appear to be in good
condition, with all guards intact. The floor drain appears to be in good condition,
including repairs previously undertaken.
Hatches — Both the north and south hatches are in good condition, including their
respective hinge bolts and gaskets. The hatch floats are in proper position and appear to
be in good condition.
Exterior Examination
_-- The reservoir floating membrane cover provides a pond of trapped water, which has
proven to be very attractive to waterfowl such as migratory ducks and geese.
At the beginning of our investigation we found an estimated 80,000— 100,000 gallons of
contaminated water, composed of a slurry of goose and duck feces, algae and water-
bome insects, trapped on the surface of the floating membrane cover. This disagreeable
"soup„ has covered all areas of the floating cover, and provides a significant source of
potential contamination.
It is important to note that Bozeman water department personnel had pumped the
membrane cover dry the day before L-EC arrived on site. We found, however, that upon
our arrival there were thousands of gallons of water floating on the surface of the cover.
Most importantly, there had been no rain since the cover had been pumped dry, a day
earlier.
The only possible source had to have been water from inside the reservoir that had
penetrated the floating cover, indicating a significant leak in the membrane cover itself:
With this in mind, LEC personnel began their preliminary investigation,
Exterior Membrane Cover - Initial exterior examination of the installed floating
membrane cover shoves a flexible floating cover of a conventional tension cable desia
and construction. The central portion of the cover is fabricated of High Density
Polyethylene, with a perimeter skirt fabricated of Hypalon@ (see attached sketch).
As described in previous inspections, the HypalonO portion of the floating cover is the
primary area of serious concern. Because of the dark color of the floating cover
membrane, it is impossible to locate holes or tears in the fabric from above. The only
way to locate any breach in membrane integrity is by underwater inspection. By visually
inspecting the underside of the opaque membrane in bright sunlight it is possible to
isolate the smallest hole in the membrane material.
HDP1✓ Cover Membrane Material — V4'hile underwater, and with direct overhead
sunlight, LEC's dive maintenance technicians found there were no visible penetrations of
the HDPE material, the HDPE portion of the floating cover appears to be intact.
HyTalon@ Membrane Cover Material (Skirt & Corner Panels) — While underwater,
and with direct overhead sunlight, our technicians found ten (10) visible penetrations
(boles) in the Hypalon.g fabric. While on site, all penetrations were repaired by the LEC
maintenance team. All previously repaired holes in the Hypalon® skirt material were
intact and required no additional repair.
As a result of LEC's inspection during last year's repairs, we advised that there appeared
to be a maximum remaining life span of the floating cover, of two to three years. Based
on our latest findings, Nve find that the rate of deterioration of the floating corer has
continued to accelerate—and at an alarming rate.
The Hypalon(D membrane cover is fabricated of numerous panels that were glued
together during fabrication and installation. During our preliminary inspection, we found
that the single largest source of leaking water (described above) was complete failure of
the four corner seams, located in the fabric of the HypalonG corner panels. These failed
seams were inflated underwater with air, dried, buffed and solvent prepped. The four
delaminated seams were then glued and sealed. During our inspection, LEC maintenance
personnel found that there are literally hundreds of linear feet of these glued seams that
have delaminated from 25% - 75% of their total seam width. As an important point of
interest we were unable to find a single seam in the entire cover which was not seriously
compromised by significant seam delamination.
In our opinion, complete failure of these searns is almost assured within the next 12 — 18
months. As a result of the sheer magnitude of the problem, repair of the floating cover is
not feasible (except in small isolated areas). This is because the actual fabric itself has
deteriorated—virtually beyond repair.
Of note, is the fact that essentially all of the visible seam delamination has occurred in the
past 10 months, most likely as a result of years of ultraviolet light and weather exposure
and most recently, the effects of this past winter, We would characterize this seam
delamination as an extremely critical issue.
With complete delamination, there would be catastrophic contamination of the reservoir
by tens of thousands of gallons of outside material, including dirt, goose and duck feces,
insects, algae and bacteria. This contamination would at the very least, result in a boil
order, as well as possible contarination of the entire water distribution system for that
portion of the City served by the North Resen oir.
With that in mind, it is our opinion that the City of Bozeman should begin immediately to
develop a long terra-solution to address the critical condition of the floating membrane
cover on the North Reservoir.
== REC€INIIb1ENIDATIONS
_ L As an interim solution, to prevent contamination of the reservoir by surface
contaminates, we recommend that the water utility department inspect the floating
--- cover membrane for leaks and tears no less frequently than every 60 —90 days. This
- -- will ensure that any serious leaks can be identified and repaired before significant
contamination should occur. This is at best, a stop-gap measure, not a permanent fix.
2. Undertake the necessary action needed to replace the existing floating cover with
either a replacement membrane cover or as an alternative, a structural roof system.
Based on expected life-cycle costs, it would be our recommendation to replace the -`
existing floating cover with an engineered structural roofing system. In accordance with
a request by Mr. Larry Woodward, we have provided estimates for the installation of two
typical engineered structural roofing systems. (See Appendix B)
Regardless of the choice selected, Liquid Engineering Corporation strongly urges
that the City of Bozeman make every effort to have installed on the North Reservoir,
no later than 1998, a permanent replacement membrane cover or structural roof
= system. In our opinion, it is highly unlikely that the existing floating membrane
__. ` cover will remain serviceable into 1999.
LIQUID ENGINEERING CORPORATION
r
WATER RESERVOIR WORKSHEET 49�
Job Number Z1 Water District C. + a 4e , N17 Date 7
Tanager a a Tank, /lam- !eese Va,r,, Maintenance Team 4.11 ;/
"fank: Diameter/Height Sq. Ft. . Gallons
f'vnstruction L. f w Bottom Contour 4-1,¢ Walls Water Depth �o
pediment: Type .vim Avg. Depth A- 4 Calculated Cu.Yds. Ali-
eV
r
_ �
Y.. Appendix A
Photographs of the Forth Reservoir floating membrane cover shoving specific
discrepancies described in the attached inspection report_ i
I I
IWO
maw
+► View of North Reservoir looking from Southwest to
Northeast. Floating membrane covers entire reservoir.
Access hatch is visible in right center of photo.
Southwest corner of reservoir with algae&bird feces clearly visible. Note algae,waterfowl feces and debris in the foreground.
Note badly weathered Hypalon®fabric which appears to be white and rough-textured. New fabric is shiny black in appearance,
y 7
Wr
MY Fast side of reservoir looking North.Note water which
has leaked through the membrane and flooded the membrane
L cover. Bird feces and algae are visible in the foreground.
_ I -
l•
t
.z
A
6
View of a stainless steel corner cable tensioning attachment point,
Notice the delarnination of the surrounding Hypalon®fabric—This is the area of one of the repairs � ;�.��•�.`;� ��'
' 1 ♦`�\
1
- ` r
lr �
jr 7
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JA-
Note severe seam delamination of Hypalon®fabric panels, as well as their severely weathered appearance Northeast corner of reservoir. Note potable water which has flooded membrane cover through failed seam.
Important to note three diagonal delaminating seams in Hypalon®fabric,
RITA
aro
_ - :i - _ ' _ -ram' �-r. ;=► �► i •i � �'•• � •
NY
low
Preparing diver to enter reservoir in order to locate and isolate damage to floating membrane cover. Northwest corner of reservoir. Algae,animal feces and debris are clearly visible,
Take particular note of the badly delaminated seam in the foreground,as well as the other six seams on the right hand side of the photo,
AOr
.1 • J
At
V/1 AO
After diver has inflated underside of membrane cover,LEC personnel pull fabric out LEC maintenance technician demonstrating total length of failed seam, which was subsequently repaired
of the water in order to dry it, in anticipation of preparing fabric for repair.
.fir. t " .
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if d
In preparation for repair and drying,the northeast corner of the I•Iypalonc&membrane cover LEC technician buffimg HypalonO fabric in preparation for re-gluing the failed seam.
is pulled from water, after diver located 28"tear in fabric
Appendix B
A permanent or rigid roof structural system is recommended as a replacement of the
existing floating membrane system. Two roof systems have been identified as a potential
reservoir cover; (1) an all-aluminum geodesic vault system and (2) a fabricated steel clear
span arch and roof system. Each of these systems utilizes a pre-engineered roof
structural system that requires a foundation system designed by the owner (City of
Bozeman),
Typical Engineered Structural Roof Systems
1_ Conservateck Clear Span Aluminum Roof System (See attached data sheet) —This
is a geodesic design self-supporting engineered roof system found throughout the
country. The company has advised us that they have been particularly successful in
providing a replacement alternative for owners looping to replace their floating
membrane covers. [Please note that the enclosed information reflects a waste water
application; unfortunately, we had no current potable water brochures in-house_ The
roofing systems are, however, identical]
Approximate frost to Construct $ 1,300,000
Benefit: Aluminum construction is highly resistant to corrosion
_. Major Considerations: Initially, more expensive than alternative materials;
requires specialized construction skills
2. Sutler Standing Seam Roof System No. MR24 (See attached data sheet) — This is
an engineered steel roofing and wall system which has been in production since 1969,
The manufacturer states that they have over ?00 million square feet of this roof
system in place.
Approximate Cost to Construct $ 1,050,000
Benefits: Lower initial cost, ease of construction
Major Consideration: Requires careful application of interior coating
- system in order to achieve maximum lifespan
Structural Roof System Engineering
Typically, the City would retain an engineer to provide design and construction
administration services. The engineer would research a minimum of 3 or 4 pre-
engineered roof structural systems and, based upon initial construction costs, warranties,
and demonstrated durability, recommend 1 or 2 roof systems to the owner. Plans and
specifications would be prepared for bidding and construction based upon the selected
roof system(s).
The basic services to be provided by the engineer would include the following:
I. Design Phase
1. Review reservoir drawings and obtain field measurements
2. Coordinate Geo-Technical foundation investigation and report
3. Investigate and select pre-engineered roof structural system
4. Prepare preliminary design and construction cost estimate
5. Review preliminary desia with owner
6. Prepare final design and drawings
7. Conduct design review with owner and governing agencies
II. Bid Assistance Phase
1. Assist with writing bid advertisement
2. Distribute drawings
3. Review bids, award recommendation
III. Construction Administration Phase
1. Process construction contract documents
2. Conduct pre-construction rneetig
3. Review submittals and shop drawings
4. Part-time construction obsmation
5. Coordinate and review materials testing
6. Process contractor's requests for payment
7. Project close-out
Structural Roof System Engineering Estimates
The cost of these basic rigid roof engineering services are estimated as follows:
Engineering Services
Design Phase $9,000
Bid Assistance Phase 1,500
Construction Administration Phase 6,000
Geo-Technical Investigation & Report 4,500
Construction Quality Control Testing 3.50
Estimated Total Engineering Cost $24,500
The scope of senrices to be provided would be refined, of course, to meet the specific
project needs of the owner.
L
Potential Alternative Solution
In discussions with water personnel, one passible alternative mentioned the construction
of an on-grade steel water reservoir at or near the current location of the North Reservoir.
At the present time, construction cast of a welded steel tank of comparable capacity (six
million gallons) would be approximately $0.40 per gallon (.40 x $6,000,000) or
_. $2,400,000.
With respect to this alternative, eve would offer the fallowing cornments:
1. This above estimate does not include the cost of site preparation (unknown), land cast
(if any) or any needed infrastructure modifications (piping, val��es, lif3ipump station
or chlorine injection system). It also does not include the engineering costs that
would be required for integration of the new steel reservoir into the City's existing
- water distribution system-
2. Comparing the ongoing maintenance expense associated with a steel reservoir versus
the maintenance expense of an in-ground concrete tank comes out squarely in favor
of the existing in-ground reservoir.
rese days municipal waste water Employing geodesic dome engineering
treatment facilities everywhere face many principles and lightweight aluminum
new, often daunting challenges. materials, our roof systems offer superior
Among them are the need to conform strength and design flexibility, giving
to a growing list of tough environmental CONSERVATEK a versatile product line
• • regulations, and the need to do so capable of meeting the most specialized
while maintaining tight control of demands of both new construction and
• operating costs. retrofit projects.
At CONSERVATEK, we design Our ALUMADOMP and ALti 4A-
' ' innovative clear-span aluminum VAULT°roof systems can be erected
to . roof systems that help waste water faster, cost less to build, are cheaper to
facility owners and operators meet maintain, and last longer than steel,fiber-
1 environmental and fiscal challenges. glass or other alternative .systems.
As a result, ALUMADOMEO Whether you want to keep odors in or
and ALUMAVAULT°roof systems the elements out,look to CONSERVATEK
are fast becoming the preferred choice to roof systems. We can help you meet fiscal
cover clarifier tanks, trickling filters and and regulatory challenges effectively and
aeration basins of all sizes and shapes. cost-efficiently.
Utilizing ALUMADOMEe and ALUMAVAULr covers of varying sizes and shapes,this state-of-the-art Mesa,Arizona
waste water treatment facility illustrates both the design flexibility and aesthetic benefits of CONSERVATEK products.
CONMRVANEK
- I
MANUFACTURERS OF CLEAR - SPAN ALUMINUM COVERS
%%W ALUMINUM?
When used in waste water environments,ALUMADOMP
covers offer a number of clear advantages over fiberglass or J �!
other alternatives. --
Easily installed,especially on basins larger than 100 • _
Low profile, minimal air volume design capability • '' Y2 47
Resistant to ultraviolet and ozone degradation • '
Resistant to corrosion from waste water processes • • _";
Resistant to unsightly biological growth
Require no periodic re-coating •
Easily customized to accommodate appurtenances
PP • l, ,
Drism N6 SOLUTION&.. b �~
1 -
- ` I7 BASIM
GMANNETT CO..GEORGIA - �
This;cuss-supported flat cover was custom-designed by our engineers to
cut odor control costs by minimizing the air volume within the covered
tank For comparable capital investment,this technology enables enormous
sovings in operating costs and demonstrates our commitment to improving _
both our product and our customers'bottom lines.
Conventional Dome -
flAW RATE 12,000 CTMAJR VOLUME-60,000 Cu.Ft. •
• • o
— -- --- - - -
Cost of Conventional Dome Cover..................$ 92,000 '
Cost of Air Treatment System' ........................$ 190,000 -
-Year Operating Costs` ...............................S 80,000
--
Total 5-Year Cost: $ 362,000
CONSERVATEWs Truss-Supported Flat Cover -
r - Row RATE:2,600 CFM • •• • •
5-Year Cost
ri Savings:
VOLUME-AIR S60,000
Cost of Truss-Supported Flat Cover .................$ 127,000 -
Cost of Air Treatment System'........................$ 150,000 - =_
5-Year Operating Costs' ...............................$ 25,000 _--:t,
Total 5-Year Cost: $ 302,000
•see Foie on bock ar�. NESSEE
07610.1 B UT
BUTLER _ BuyLine 3769
ButlerStandi'ng S
Roof S
Today there are more than 700 million square feet of the Since the introduction of the MR-24 roof in 1969, its
MR-24� roof system in place. Though originally designed performance has been unsurpassed by any roof system.
only for Butler Buildings-, in recent years Butler Builders2, In fact, according to recent surveys by U.S. Steel and
have installed millions of square feet on re-roof applications Architectural Record magazine, the MR-24 roof system by
and on new conventionally designed structures. Butler is specified by more architects than any other stand-
Now you can specify MR-24 or CMR-241` roofs for just ing seam roof on the market.
about any kind of building — a new conventional structure; Butler's most recent roof system introduction is the
a re-roof of almost any existing building; and of course, on a VSR, roof system...designed exclusively for architectural
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THE MR-24 THE CMR-24 THE VSR
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Every part of the exclusive MR-24 The CMR-24 roof system is the first The clean, bold lines of the VSR
roof system uses only the highest ever to combine most of the benefits standing seam roof lend themselves
quality materials to assure a weather- of a conventional built-up roof with the to accomplish the highest levels of
tight standing seam roof that acts like benefits of the MR-24 roof. appearance. Both a fluffed and non-
a single. monolithic steel membrane. Like a conventional built-up roof, flutted pan design are available.
the CMR-24 roof provides an interior The panel configuration easily
Roof panels are permanently steel liner that protects the insulation accommodates complex roof geomet-
seamed together with a full 360' and gives the building interior a fin- ries and simplifies flashing designs.
"Pittsburgh" double-lock seam to ished look. The popular architectural treatment of
keep moisture out and assure struc- a continuous roof-to-fascia design is
tural integrity. But unlike any built-up roof, the simply performed with the VSR roof
CMR-24 system is topped with the system.
Roof clips securely attach the roof MR-24 roof. Which means you'll find It is specifically designed for archi-
panels to the supporting structurals all the benefits of the MR-24 roof in tectural applications on roof slopes of
by stainless steel tabs which are roll the CMR-24 roof as well. 2.12 and greater.
formed into the panel seam. By utilizing the diaphragm capa- Concealed fixed clips are used to
Every connection is precisely pre- bilities of the CMR-24 roof system, it anchor the roof panels for panel
punched at the factor may be possible to economize on the spans of 40 feet or less. Moveable
p y-purlins, building's structural components. clips are furnished for longer spans.
eaves, end splices. ridges and flash- The moveable clips are capable of
ings—to ensure proper alignment The CMR-24 roof also offers excel- handling up to 2 inches of thermal
when the roof is erected. Proper lent energy savings, through a built-in movement. Both the clips and panels
alignment is critical to allow the fin- layer of Thermax- metal building have a factory installed sealant to
ished, seamed together roof to move board. provide that extra measure of protec-
as it expands and contracts with tem-
. Tax;sa,eg,5te.edTrace.rarKwtheCelotex tion to prevent the possibility of leaks
perature change. Corp from driving rains.
lYl(l-24� CM(S-24 VSR
7M
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Harry and David,Medford,Oregon Harry and David,Medford,Oregon
Slope Build-Up System for Re-Roof Installing insulation and MR-24 panels
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Mazza Cheese Company, Sumner,Washington Fort Drum,Watertown, New York
MR-24"' Roof System VSR" Roof System
NXELLY CONST Call: (816) 968-3322 for
r I$Ic Monad Road of
information and the name
of your local representative.
DESIGNER/SPECIFIER MANUAL
Ifyvu woM like a copy of Butler's roof
systems man ualkatalog,please write to
_ - Butler Roof Systems, on your company's
letterhead.
ill SUTLER
Butler Manufacturing Company
Butler Roof Systems
P.O. Box 419917, Dept. SW-4
Cover it up with a new MR-24 roof by Butler. Kansas City, Missouri 64141-0977
Form No.4768-8-90 91990 BUULt Mfg-Co.
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410 i • '�
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Nate bead of extruded sealing compound that has pulled away from stainless steel strip. Tensioning cable attachment patch. Note tears in Hypalon®reinforcement patch. It is impossible to determine if these tears pcnetrate
the underlying membrane cover as a result of tension on the mcmbrane fabric and the associated folds.
C.
14
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1
Note delamination of reinforcement and repair areas in Hypaloii@ skirt.
Note tearing and initial stages of delamination of tension cable attachment patch.
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Area of Hypalon®floating membrane cover seam delamination.
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Additional membrane seam delamination.
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Area of Hypalon®floating membrane cover scam delamination.
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Area of Hypalon®floating membrane cover seam delamination.
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Ahl
City of Bozeman
Addendum To
North Reservoir Inspection Report
Following is an addendum to an original inspection report of the 'North Reservoir owned by the City of
Bozeman, Montana. The original report as well as the findings described in this addendum are based on repair
and inspection activities conducted by Liquid Engineering Corporation (LEC) maintenance technicians on May
31 and June I, 1997.
In addition to the inspection findings presented in the original inspection report, LEC identified two other
significant findings that are described in this addendum.
Additional Discrepancies
I. The stainless steel strips which sandwich the perimeter mating edges of the HDPE and HypalonQ
membranes were originally sealed with a plasticized sealing compound. LEC technicians identified a
number of areas where this sealing compound has been extruded and shed as a result of the movement and
"working" of the stainless steel strips and attached membranes. (See attached photographs) Depending on
the extent of sealant extrusion that occurs, there is a potential for leaking in these areas. However, during
their inspection LEC technicians did not find any indications of leaking at these points.
1 In this style of floating membrane cover, there are tensioning cables installed around the entire perimeter of
the reservoir. These cables are used to maintain the proper amount of tension on the excess membrane
materi
al that is installed in order to allow the membrane cover to move up and downwithvariations the
reservoir's water level.
These tensioning cables are attached to the membrane cover with Iarge patches of reinforced Hypalon& that
are then glued to the actual floating membrane cover. LEC found that a number of these attachment
patches have begun to delaminate from the underlying membrane cover. Close inspection found that with
one notable exception, none of the delaminating patches appears to have damaged the membrane. The only
exception to this finding is shown in the attached photograph.
In addition to the discrepancies described above, we have taken the liberty of providing additional photographs
of areas demonstrating significant delamination and/or deterioration.