Loading...
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 �l 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 " . jr ' � f r 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 Butler building. applications. THE MR-24 THE CMR-24 THE VSR ROOF SYSTEM ROOF SYSTEM ROOF SYSTEM 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 �.>•1iWGl - ST .. -� 1"ftJSIWiI _ • �`�... �y� t "� { �y � � � sue.- ''. �Y - . _ Harry and David,Medford,Oregon Harry and David,Medford,Oregon Slope Build-Up System for Re-Roof Installing insulation and MR-24 panels ..t a J`A Y r 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. r. 410 i • '� •`'� .��....nv :~, � �~•1~ a + _ •f.. - i'• 4�. ♦. rJ� �,- / � 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 j 1 Note delamination of reinforcement and repair areas in Hypaloii@ skirt. Note tearing and initial stages of delamination of tension cable attachment patch. A► _ T � J 41 .Tl 1 _ � t Area of Hypalon®floating membrane cover seam delamination. i� ' f a� �t ti �J • r' _'. .H� a rat. 1 Additional membrane seam delamination. 1 O Po . ri. Area of Hypalon®floating membrane cover scam delamination. 'AWL.. .', •����. ..,�'� •, �:,.� ,�,, t ,� may. _ ,.. � �,-. wr �_ - �� : z �'�'ti. V �� � � -sue• � �,•�' •" hyM. " lr + y� "V 1• �1 r � �a .` w7 Lys it MAW A � �►� ..�.' :�'�•. .,.�.�-gym..::. ...� . Area of Hypalon®floating membrane cover seam delamination. ..,tee. --.1 '�• '',. ;' 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.