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HomeMy WebLinkAbout8.3 Motion to Accept Proposal for Booster Station 11 Reservoir Rehabilitation Construction Engineering and Observation Services5/12/2017 BoardDocs® Pro IN Agenda Item Details Meeting May 16, 2017 - REGULAR MEETING OF THE MOUNT PROSPECT VILLAGE BOARD - 7:00 p.m. Category 8. VILLAGE MANAGER'S REPORT Subject 8.3 Motion to accept proposal for Booster Station 11 Reservoir Rehabilitation Construction Engineering and Observation Services in an amount not to exceed $46,000. Access Public Type Action Preferred Date May 16, 2017 Absolute Date May 16, 2017 Fiscal Impact Yes Dollar Amount 46,000.00 Budgeted Yes Budget Source Water and Sewer Enterprise Fund Recommended Accept the proposal from Tank Industry Consultants of Indianapolis, IN for Tank 11 Construction Action Engineering and Observation Services in an amount not to exceed $46,000. Public Content Information The water storage tank at Booster Station 11 is a 1 -million gallon, ground -level, welded steel reservoir situated in the middle of the Mount Prospect Golf Course (600 See Gwun Avenue). This tank, in conjunction with its adjacent booster pumping station, helps satisfy peak water demand and fire flow requirements. The attached map depicts this location. This tank is one (1) of seven (7) in the Village -owned water distribution system. In total, these tanks provide 8.8 million gallons of water storage capacity. The Village's average daily demand for water is 3.5 million gallons. Each of these tanks is routinely inspected by a qualified engineer to assess, structural condition, corrosion control, coating adhesion, and safety compliance. Tank 11 was inspected in 2015 by engineers from Tank Industry Consultants (TIC) of Indianapolis, Indiana. TIC is an engineering consulting firm that specializes in the maintenance and repair of steel storage tanks. TIC's complete report is enclosed. In summary, the TIC report finds that both interior and exterior coatings are in good overall condition and should not require painting for another 5 to 7 years. However, repairs to the interior rafters of the tank are needed to maintain structural integrity of the roof. The rafter repair work primarily involves replacing the welded steel purlins that provide lateral support for the rafter system. After the repairs are made; touch-up coating of affected work areas is required. On May 2, 2017 the Village Board awarded a contract for rehabilitation of the water storage tank at Booster Station 11 to Jetco, Ltd., of Lake Zurich, Illinois in an amount not to exceed $201,715. The complexity and the specialized nature of the work requires the use of a consultant to provide construction engineering and observation services throughout the duration of the repairs. Staff asked three (3) area firms that perform this type of work to submit proposals to assist the Village with full-time, on-site construction observation for seven (7) weeks and general contract administration. The three firms which staff requested were Burns & McDonnell Engineering of Downers Grove, Illinois (Burns), Dixon Engineering of Hales Corner, Wisconsin (Dixon) and Tank Industry Consultants of Indianapolis, IN (TIC). All firms have experience in construction observation, welded tank repairs and with the Village water system. hftps://www.boarddocs.com/il/vomp/Board.nsf/Private?open&login 1/3 5/12/2017 BoardDocs® Pro Each firm was asked to submit as part of their proposal the following information: 1. Summary of the firm's approach to the project 2. Task estimate and cost proposal for the construction administration of the project and for the on-site observation of the work effort. Tasks that were identified to be performed included: Provide project layout Provide inspection and supervision Respond to Contractor Inquiries Interpret the specifications as they relate to the work Attend meetings Review and recommend approval on pay estimates and Prepare punch lists The consulting firms' proposals were reviewed on the basis of their understanding of our goals and their project methodology. They were rated (with a maximum score of 100 points) according to these specific categories: background of firm, capacity to perform work and understanding of project. Table 1 below summarizes this analysis: Table 1 Category Dixon Burns TIC Background of firm (Max 15 points) 15 15 15 Capacity to perform work (Max 15 points) 8 12 15 Understanding of project (Max 20 points) 10 15 20 Related project experience (Max 20 points) 12 8 15 Project schedule (Max 15 points) 14 14 14 Projected man-hours (Max 15 points) 15 15 15 Total Points: 74 79 94 The highest rated firm was Tank Industry Consultants. TIC has put together a strong project team with extensive experience working on welded steel tanks. They provided a thorough proposal that will meet the village's objectives. It is staff's opinion that TIC will provide the best product. A copy of TIC's proposal is enclosed. Cost proposals were also requested from all the consultants. Analysis of cost proposals is summarized in Table 2 below: Table 2 Consultant Tank Industry Consultant Proposal $41,000.00 Burns & McDonnell $39,767.00 Dixon Engineering $37,094.75 The lowest overall cost proposal was submitted by Dixon Engineering of Hales Corner, WI. The overall difference between the highest and lowest cost proposal was $3,905.25 or 9.5%. Dixon Engineering is similar to Tank Industry Consultants in that they only perform tank and reservoir repair, tank painting and tank construction work. However, it is the opinion of staff that TIC has a better understanding of the project stemming from their involvement in tank evaluation. hftps://www.boarddocs.com/il/vomp/Board.nsf/Private?open&login 2/3 5/12/2017 BoardDocs® Pro Furthermore, the firm has extensive local experience with this type of work including designing and monitoring the replacement of steel water storage tank roofs at Booster Station 17 in 2016 and Booster Station 16 in 2010. Both of these projects were completed successfully and under budget. Most notably, TIC's project team includes John Lieb who is a renowned steel storage tank expert with over 43 years of experience in the design, construction, repair, and maintenance of steel storage tanks. Mr. Lieb's experience also includes over 24 years as a tank engineer for Chicago Bridge & Iron, the firm that originally constructed Tank 11. As such, Mr. Lieb has a distinctive and comprehensive understanding of the tank design and structural elements. For reference, the project team's curricula vitae are attached. It is the conclusion of staff that TIC's proposal provides substantive qualitative value at relatively minimal additional financial cost ($3,905.25). Staff is recommending that a contingency of $5,000 be added to the award for any additional time or to offset any other unanticipated fees or costs incurred. If the funds are not used; they will not be spent. Also, if the work is completed sooner than the estimated seven (7) weeks then those on-site observation funds would not be spent. Alternatives 1. Accept proposal from Tank Industry Consultants for Reservoir 11 Construction Engineering and Observation. 2. Action at discretion of Village Board. Staff Recommendation Staff recommends the Village Board accept the proposal submitted by Tank Industry Consultants of Indianapolis, IN for Reservoir 11 construction engineering and observation in an amount not to exceed $46,000. Roof Rehab and Spot Coating of Tank Station 11 -TIC proposal.pdf (465 KB) Map Location of Station 11.pdf (985 KB) John_Lieb_011516.pdf (118 KB) Greg_Cannon_011516.pdf (113 KB) Station 11 Tank Evaluation Report 06-08-15.pdf (59,770 KB) Administrative Content Executive Content hftps://www.boarddocs.com/il/vomp/Board.nsf/Private?open&login 3/3 ic TANK INDUSTRY CONSULTANTS 7740 West New York Street Indianapolis, Indiana 46214 317 / 271-3100 - Phone 317 / 271-3300 — FAX Plainfield, Illinois 815 / 556-8335 Sacramento, California 916 / 717-3608 Houston, Texas 281/ 367-3511 El Paso, Texas 915 / 790-0790 Pittsburgh, Pennsylvania 412 / 262-1586 February 2, 2017 Mr. Matt Overeem Water and Sewer Superintendent Village of Mount Prospect 1700 West Central Road Mount Prospect, Illinois 60056-2229 RE: Professional Services associated with the Rehabilitation of the 1,000,000 Gallon Station 11 Standpipe TIC Project #H373.007 Dear Matt: As you requested, I am pleased to present the following proposal for construction phase services associated with the rehabilitation of the Station 11 Standpipe. Resident Project Representation: The resident observation of the contractor's workmanship is the most important part of this project. The best -written, most thorough specifications do not assure the project is completed correctly. TIC's technicians are experienced in tank repair, painting, and erection. They are not only familiar with proper coating application techniques, but also with the underlying reasons for tank painting standards. In addition, our entire staff of civil, structural, chemical, and mechanical engineers and support personnel, including our MACE Certified Field Services Manager, Field Supervisors, and Contract Administrator are available for supplemental technical support for any special problems that might occur. Daily Progress Reports: TIC's technician will furnish Mount Prospect and the contractor with a written report for each day's evaluation. The reports will address, at a minimum, the following items: • Temperature of steel • Weather conditions o Temperature o Wind velocity and direction o Relative humidity o Dew point • Location and quality of work performed and compliance with the project documents • Paint batch numbers • Surface profile • Wet and dry film thickness readings • Calibration record of dry mil thickness gauge • Measure of the paint cure • Number of men and equipment on the job • Recommendations made • Estimated completion date • Other pertinent data as required or requested The following equipment (at a minimum) will be utilized by TIC to monitor the work: Mr. Matt Overeem Page 2 Village of Mount Prospect, Illinois — Construction Phase Services Station 11 Tank February 2, 2017 • SSPC-Vis 1 Visual blasting standards • NACE Visual Standard TM -01-70 (available) • AWWA Standards D100-11 and D102-11 • Testex Press -O -Film Profile Measurement System • Surface Contamination Detection Device [soluble salts] (if required) • Wet Film Thickness Gauge (observe applicator's use) • Dry Film Thickness Gauge • Certified Thickness Calibration Standards • Steel Temperature Gauges • Sling Psychrometer and Psychometric Tables • Wet Sponge Holiday Detector [low voltage] (if required by TIC personnel) • Adhesive Force Measurement Device (if required) • Tooke Gage (if required) Atmospheric Conditions and Contaminants: Coatings are very sensitive to atmospheric conditions. Humidity, dew point, air, and steel temperatures must all be within acceptable ranges during application and curing for coating systems to achieve maximum life. Evidence of the application of the coating under adverse atmospheric conditions may be a premature failure two or three years later. In some environments, there is also the problem of contaminants being deposited on the steel and between coats of paint. Even small traces of contaminants beneath a coating system have been found to cause premature coating failure. Coating System Integrity: Numerous other situations may occur that can significantly reduce the life of the coating system. Causes for premature coating failure such as contaminants in the abrasive or on the steel, rust film forming on steel before priming, and improper surface profile cannot be found by an inexperienced technician. All of these situations require an experienced technician to identify not only the problems, but to make constructive suggestions to correct them. Our technicians will also observe a low -voltage holiday detection test on interior surfaces, including the roof. Environmental Impact: TIC is very concerned about the environmental impact of the tank rehabilitation project we are involved in, and is dedicated to complying with environmental regulations. If required, we will have TCLP tests be performed on the contractor on the blasting debris to determine if it is hazardous and requires special handling and disposal. Soil samples will be taken from carefully plotted locations on and around the tank site prior to the start of the cleaning and painting project. This testing will provide background samples that can be tested and compared with samples taken from the same locations at the project's conclusion. This before and after sampling and testing will help to gauge the impact the project had on the environment and neighboring property, and will help protect the Village from claims for pollution which existed before the project started. If requested, TIC will have a qualified laboratory perform the laboratory analysis. The actual cost of laboratory analysis will be determined by the number of samples that will be required. Contract Administration: Once a tank rehabilitation project begins, TIC will be available to consult with and advise the Village concerning any portion of the tank rehabilitation and repainting project. Included with this proposal as Exhibit A is a listing of Contract Administration services typically performed by TIC. Some of the contract administration could include: • Consultation on adequacy and compliance with the project specifications • Specification interpretation • Attend the pre -construction and subsequent meetings—supplying typed meeting notes • Review all contractors' submittals and shop drawings • Review construction schedule Mr. Matt Overeem Page 3 Village of Mount Prospect, Illinois — Construction Phase Services Station 11 Tank February 2, 2017 • Review and approval of materials • Prepare and assist in the negotiations of change orders and supplemental agreements • Review and approval of payment requests • Dispute settlement • Public relations The fees for the construction phase services will be billed on a time and expenses basis from the rate structure in effect at the time the services are performed. The current rate structure is attached for your review. The contractors' construction methodology and work force allotment will be the overall determining factor for inspection hours and costs for this project. Based on our experience with similar projects we estimate the following: Resident Project Representation*: 6 - 7 weeks @ approximately $5,000/week $30,000 - $35,000 Contract Administration: $4,000 Subcontract Laboratory Analysis: $2,000 *A minimal amount of time may be charged for the field technician's preparation of documentation in addition to on- site time. To proceed with this project, please sign the two copies of the enclosed Standard Agreement and forward one original to us. After receipt of this agreement, TIC will contact you to schedule the field work portion of this project. We look forward to working with you on this project. If you have any questions or comments, please contact me. Yours truly, Tank Industry Consultants Penni Snodgrass Sales and Marketing Manger Mr. Matt Overeem Page 4 Village of Mount Prospect, Illinois — Construction Phase Services Station 11 Tank February 2, 2017 Tank Industry Consultants 7740 West New York Street Indianapolis, Indiana 46214 Professional Services 2017 Rate Structure Effective January 1, 2017 through December 31, 2017 m uuum m�uu m�mmlfm mem uuum uum m uuuuu� i m�uu m Vuuum uuuu uum uuuu mem uu umIIIIIVu m m luuuuo u�Vu Technician (travel and on -job time) $71.25 per hour Overtime (over 40 hrs/week) $106.88 per hour Minimum 32 hours per week Per Diem $137.75 per day Technician (travel and on -job time) Per Diem Support Staff Field Services Manager/Contract Administrator Field Superintendent/NACE Certified Technician Overtime (over 40 hrs/week) Minimum 32 hours per week Project Manager Engineer - E.I. Professional Engineer Licensed Senior Professional Engineer Licensed Principal Engineer Licensed Senior Principal Engineer Safety Director Clerical $98.75 per hour $160.50 per day with lodging $59.50 per day without lodging Hourly Rates Shown Below $120.00 per hour $119.00 per hour $178.50 per hour $126.00 per hour $109.25 per hour $154.50 per hour $228.80 per hour $260.00 per hour $299.50 per hour $156.25 per hour $61.60 per hour A charge of $12.25 per hour is added for every office hour worked to cover copying, fax, mail, telephone, long distance, paging, cell phone, trucks, field equipment, and other miscellaneous costs. $0.85 per mile per vehicle from nearest office Indianapolis, IN + Pittsburgh, PA * Houston, TX * Plainfield, IL * El Paso, TX * Sacramento, CA • Travel by public transportation at cost, plus 10%. • All other reimbursable expenses (not otherwise listed on this rate structure) at cost plus 10%. • Total Lead in Samples by Atomic Absorption Spectroscopy $140.50 per sample • Total Metals (Cadmium, Chromium & Lead) in Samples by Atomic $286.50 per sample Absorption Spectroscopy • Leachable Lead in Samples by Toxicity Characteristic Leaching Procedure $592.50 per sample 07.22.2016 Mr. Matt Overeem Page 5 Village of Mount Prospect, Illinois — Construction Phase Services Station 11 Tank February 2, 2017 Prior to and at the Start of the Construction Phase * Tasks sometimes completed by Owner Assemble and distribute Contractor Agreements * Distribute signed agreements when received from Owner Issue Notice of Award Assemble field book Review project specifications and contractor submittals Review submittals, schedules, etc., and process and transmit to Field Observer and file Review and verify Contractor's certificate of insurance meets contract requirements Review bonds and agreements received from Contractor Schedule, draft agenda, and attend pre -construction meeting, either in person or via teleconference Prepare and distribute pre -construction meeting minutes Verify Field Observer has required equipment and that equipment is properly calibrated Assemble project work list (repairs) During Construction Phase Processes soil samples, track chains of custody, and prepare transmittal letters Communicate at least daily with Field Observer Issue equipment and supplies to Field Observer Draft weekly update on project status Prepare, review, and sign change orders Transmit change orders to Contractor, Owner, and Field Observer Receive, evaluation, and resolve Non -Compliance Reports (NCR) Receive, evaluate, and resolve Requests for Information (RFI) Receive and process Work in Process Observation Daily Forms Receive, resize, label, and process Work in Process photographs, and mail to Owner Review Work in Process photographs for correct labeling and quality of work Review daily field reports Attend progress meetings Review contractor pay applications Review project schedule and status Review Field Observer's weekly time sheet to verify accuracy and cross reference to WIP forms Review and approve Client invoicing Track project funds to assist Owner in meeting project budgets Review and comment on safety issues or concerns Make site administrative visits for quality control At Conclusion of Construction Phase Review/process punch lists Close out project when complete Conduct QP 5 quality audits 14402 West Lockport Street, Suite 223 Plainfield, Illinois 60544 815 /'.356.83'35 nnrgnrgnr 'Fan➢a Indu.str yr, coo l,ioNa l ank]riidusl::r-y cwri� Chief Engineer Tank Industry Consultants Education: B.S., Civil Engineering - Cleveland State University Professional Registrations • Registered Professional Engineer in 15 States • Canadian Provinces of Alberta, British Columbia and Newfoundland and Labrador Professional Certifications ANSI/API 653 Certified Aboveground Storage Tank Inspector License #51 STI Inspector AC 21310 API RP 579 Fitness -For -Service Training Course Certificate Professional Affiliations Member: American Petroleum Institute (API) Subcommittee on Aboveground Storage Tanks Member: American Society of Civil Engineers (ASCE) Member: The Society for Protective Coatings (SSPC) Award: James F. Lincoln Arc Welding Foundation Award - 1974 Years of Tank Experience: 43 John Lieb is a nationally recognized expert in the design of plate structures including specialty plate structures for petroleum, chemical, and granular industries throughout the world. Mr. Lieb has over 40 years' experience as an Engineer, including 24 years with Chicago Bridge and Iron Company (CBI). Most of his experience has been in the design and detailing of complex ground level and elevated plate structures and their associated structural, mechanical, and environmental systems. These structures have included tanks certified to API 650 and API 620, stamped and non -stamped ASME pressure vessels, AWWA water storage tanks, granular storage and handling systems, and a wide variety of plate structures and structural systems designed in accordance with various international codes and standards. Prior to joining Tank Industry Consultants, Mr. Lieb served as a Product Design Manager in his company's Plate Structures Engineering Group. In this capacity, he was responsible for technical supervision and management of a group of graduate engineers and technicians performing contract and pre -contract design engineering for a wide variety of specialty plate structures for the petroleum, chemical, water, natural gas, and granular industries. An important focus in this role was the development of cost-effective, reliable storage and process equipment design based on customer -specified performance requirements. He was also responsible for the preparation and maintenance of company technical standards related to these product lines. Mr. Lieb also served as the company's representative to the American Petroleum Institute (API) and is active as TIC's representative on the API Subcommittee on Aboveground Storage Tanks and several Special Task Forces. Mr. Lieb is an ANSI/API 653 and STI Certified Aboveground Storage Tank Inspector. He was a primary contributor to the initial publication of API Standard 653 in 1991 and has remained directly involved in its maintenance ever since. He also contributed to the development of STI Standard SP031. Early in his career, Mr. Lieb served as a project engineer, design engineer, and field engineer on numerous shop and field erected metal plate structures. 7740 West New York Street infflanapolis, llndd airy 46214 317/271 .3100 www.Tanikindustr•y.c om Field Superintendent Tank Industry Consultants Certifications • NACE Coating Inspection Technician #10339 • Certified Commercial Diver • Rope Rescue Operations/Technician • 30 -hour OHSA Training • Internal Auditing Basics • Red Cross First Aid B.C. Workplace Emergency First Aid — CPR Level A • DAN Diving Emergency Management Provider • Basic First Aid and Adult/Child/Infant CPR • Panametrics Ultrasonic Non -Destructive Testing Levels I and II • New Jersey Lead Certification Permit Industry Activities • SSPC: The Society for Protective Coatings • NACE International Years of Tank Experience: 36 Introduction: Greg Cannon has been a member of TIC Field Services Department for twenty-one years. As a senior member of the field department, Greg inspects many of TIC's tank construction projects observing concrete pours, welding, and general construction. He performs evaluations of existing tanks and observes cleaning and coating projects. Greg serves as Crew Lead on a large number of TIC tank evaluations each year. In this capacity, he is responsible for all work activities of TIC personnel on the site, and the quality of the data collected. Greg also performs ROV and dive evaluations of tank interiors. Prior to joining Tank Industry Consultants, Greg spent a number of years in the shipyard industry, cleaning and painting ship tanks in the Pacific Northwest. There he gained invaluable experience in confined space procedures, welding and construction, as well as proper coatings application and abrasive blast cleaning. Greg also performs Job Evaluations of field personnel to help assure our clients of the very best in resident inspection of tank cleaning and painting projects. r EVALUATION OF THE 1,000,000 GALLON STEEL GROUND STORAGE TANK "STATION 11 TANK" MOUNT PROSPECT, ILLINOIS .am VILLAGE OF MOUNT PROSPECT MOUNT PROSPECT, ILLINOIS July 8, 2015 15.119.H373.007 I C TANK July 20, 2015 INDUSTRY CONSULTANTS INC. SUBJECT: 7740 West New York Street The subject of this report is the field evaluation of the 1,000,000 gallon steel Indianapolis, Indiana 46214 ground storage tank in Mow -it Prospect, Illinois. The tank was owned by the 317 / 271-31.00 - Phone Village of Mount Prospect and was known as the "Station I I Tank." The field 317 / 271-3300 - FAX evaluation was performed on July 8, 2015 by James A. Peyer, Kyle M. Spaulding, and Anthony R. Turpin of Tank Industry Consultants. The Owner's representative on the site at the time of the field evaluation was Dan Murphy. The sphericon, knuckle roof tank was of welded steel construction. According infon-nation on the tank nameplate, the tank was built in 1.968 by Chicago Plainfield, Illinois Bridge and Iron Company under contract number 68-3225. The tank Bridge 915 / 556-8335 nameplate also stated that the tank diameter was 98 ft, and the high water level Pittsbut-gh, Pennsylvania was 18 ft2In. 412 / 262-1586 El Paso, Texas OBJECTIVE: 915 / 790-0790 The purpose of this washout and evaluation was to determine the condition of Houston, Texas 281 367-3511 the tank interior, exterior, exposed. foundation, and accessories. The purpose of this report is to present the findings of the evaluation and to make recommendations for recoating, repairing, corrosion protection, and maintenance. Budget estimates for the work, anticipated life of the coating and the structure, and the replacement cost of the tank are also included. AUTHORIZATION: This washout, evaluation, disinfection, and report were authorized in P.O. No. 2015-00000428 dated April 30, 2015. EXECUTIVE SUMMARY: The coating on the interior and exterior of this tank were in good overall condition and should not require repainting within the next 5 to 7 years. The tank should be re-evaluated in 3 to 5 years as recommended by AWWA. Structural calculations should be performed to determine if the purlins in the interior roof support structure are required, and if so, how many are Deeded. The deteriorated purlins should be removed and replaced. Until such time as the purlins can be removed or replaced, personnel should not access the tank interior due to the potential for the purlins to fall. An Employee -Owned Company 1, 000, 000 Gallon Ground ,Storage Tank, "Station 11 Tank" Page 2 Village of Mount Prospect, Illinois 15.119.H373.007 ANSUOSHA and Safety -Related Deficiencies: There were OSHA and safety-related deficiencies on this tank. These deficiencies included: ♦ the purlins on the interior roof support structure were deteriorated and in danger of falling, and ♦ the roof safety railings were not equipped with toe bars (29 CFR 1910.23(e)(4)). If the Owner wishes to fully comply with OSHA and safety-related standards, it is recommended that these deficiencies be rectified. The deficiencies listed above are not intended to be a complete list of deficiencies on this tank. The Owner should refer to the complete report text and accompanying photographs for a complete account of all observed deficiencies. This evaluation and the reporting of the condition of this tank do not warrant the original structural condition of the tank or any of the original design for seismic loadings. Likewise, recommendations for this tank do not include modifications which may be required for compliance with present structural codes. PHOTOGRAPHS: Color photographs were taken of the visible portions of the foundation, the tank interior and exterior and are included as a part of this report. The significant photographs are keyed to the observations. NOMENCLATURE: The terms used in describing the various components of water tanks are unique to the industry. In fact, the terms vary from firm to firm and from person to person. In an attempt to define the terms used in this report, a sketch of the general type of tank covered is included at the end of the narrative portion of this report. Each horizontal row of steel plates on the tank is referred to as a "shell ring" or "ring." To aid in referencing the shell rings, the bottom ring is referred to as shell ring 1 and the top ring is shell ring 2. Warning: Some appurtenances on this tank may be referred to as erection or rigging attachments, lugs, or brackets. This does not mean that they are safe for rigging. Each attachment for each tank should be evaluated on an individual basis by a structural engineer or an experienced rigger before being used. These devices may have been intended for only the original erectors and painters to use with specialized equipment. ADHESION TESTS: All adhesion tests performed during this evaluation were done in general accordance with ASTM D3359. The results are reported herein using the ASTM scale. The ASTM scale is a relative scale to rate adhesion from 0 to 5 with 5 being the best. A table of adhesion test results classification is included with this report following the sketch of the tank. 1, 000, 000 Gallon Ground ,Storage Tank, ",Station 11 Tank" Page 3 Village of Mount Prospect, Illinois 15.119.H373.007 HEAVY METALS TESTS: Samples of the exterior and interior coating systems were sent to a laboratory for inductively coupled plasma -atomic emission spectrometry analyses. The test results were as follows: Cadmium mg/kg percent Chromium mg/kg percent Lead mg/kg percent Exterior <25 <0.0025% <250 <0.025% 806 0.0806% Interior <25 <0.0025% <250 <0.025% <250 <0.025% Tank Industry Consultants performs this test only to determine if there is lead, cadmium, or chromium present in the coating samples. To limit damage to the existing coating, only small areas were tested. The small number of samples taken and the difficulty of retrieving all primer from the steel profile may cause the tests performed to not accurately represent the total coating system. Variations in thickness, types of coatings applied, and the interim cleaning and painting operations will also affect the actual readings. The reliability of the results is also dependent on the amount of primer included in the sample. Additional testing to determine the amount of leachable contaminants present in the spent cleaning debris will need to be performed following cleaning operations at the time of repainting. Results from the laboratory analysis are included following the adhesion tables. ULTRASONIC THICKNESS MEASUREMENTS: Roof Plates: Sheets: Knuckle Shell: Ring #2: Ring #1: Bottom Plate: (all readings were taken through coating) 0.247 in. to 0.265 in. 0.304 in. to 0.329 in. 0.291 in. to 0.298 in. 0.464 in. to 0.468 in., bottom 0.243 in. to 0.261 in. OBSERVATIONS: A. Foundation and Site SITE: Size: undefined Fence: none Nearest Strictures: Type: pump house Direction: south Distance: approx. 7 ft 4 in. 1, 000, 000 Gallon Ground ,Storage Tank, "Station 11 Tank" Page 4 Village of Mount Prospect, Illinois 15.119.H373.007 Type: building Direction: east Distance: approx. 29 ft Nearest Overhead Power Lines: none near FOUNDATION: Type: concrete ringwall Projection Above Grade: North: 3 in. to 4 in. South: 5 in. to 6 in. East: 5 in. to 10 in. West: 10 in. to 11 in. Grout: none visible Sealant: polyurethane Fiberboard: approx. 3/8 in. thick VALVE VAULT: Location: south of tank Size: 6 ft 8 in. deep Access: Size: 30 in. square Locked: yes Ladder: none 1. Site Location: The tank was located on the grounds of the Mount Prospect Golf Course at 600 South See Gwun Avenue in Mount Prospect, Illinois. There no residences within the vicinity of the tank. Access to the site was via an 8 ft wide asphalt drive. (See photos 1-7) 2. Site Conditions: The tank site was covered with grass and was graded to provide adequate drainage away from the foundation. On the east side of the tank, the perimeter was asphalt, and on the west side of the tank the perimeter of the tank was grass. The site was not fenced. There was a pump house on the site, and several poles were adjacent to the site. A cathodic protection control cabinet for the tank was located in the pump house, and it housed the system's rectifier. Piping extended from tank into pump house. The pipe was supported by concrete blocks. Trailers, landscaping equipment, stone/rock barriers, brush piles, and gravel mounds were located within 3 ft of the tank on the north and east sides. A cellular antenna tower was located north of the tank on the site on the opposite site of a building. (See photos 1-8, 13, 22-23, 25-26, 29) 3. Foundation: The tank foundation appeared to be a concrete ringwall with a beveled edge. Except for minor cracking and some spalled areas, the exposed surface of the foundation appeared to be in nearly its original structural condition at the time of this field evaluation. The foundation did not consistently exhibit the AWWA recommended 6 in. to 12 in. projection above grade. White coating was visible on the exposed concrete surfaces at the time of this field evaluation. The ground was eroded on the west side of the tank directly at the foundation. (See photos 1, 8, 13-21, 24-26) 4. Fiberboard and Sealant: There was a sealant located around the bottom plate -to - foundation interface. The sealant had randomly disbonded from both the foundation and the baseplate. 1, 000, 000 Gallon Ground ,Storage Tank, ",Station 11 Tank" Page S Village of Mount Prospect, Illinois 15.119.H373.007 Fiberboard was observed between the bottom plate and the concrete foundation. Vegetation had grown at voids in the fiberboard and sealant. (See photos 16-20) 5. Valve Vault: There was a valve vault located approximately 1 ft south of the tank. The valve vault was part of the pump house basement. The exterior access into the valve vault was locked prior to or after this field evaluation. There was a 16 in. diameter outlet pipe and a 10 in. diameter inlet pipe were located in the vault. The coating on the riser pipes at the penetration to the tank floor had peeled, and corrosion was noted. (See photos 8-11) B. Exterior Surfaces DESCRIPTION: Construction: welded steel Diameter: approx. 98 ft Shell Height: approx. 16 ft Shell Rings: 2 Roof Type: sphericon knuckle NAMEPLATES: Number: 2 Location: above shell manhole HORTON TANK 68-3225 1968 CONTRACT NO YEAR 98-0� X 18'-2" H.W.L. RESERVOIR CHICAGO BRIDGE & IRON COMPANY STEEL TREATED BY HORTON PICKLING PROCESS BOTTOM PLATE PROJECTION: 1-3/4 in. to 3 in. from shell SHELL MANHOLES: Number: 2 Location: southeast and northwest sides of shell ring 41 Type: flanged and bolted Size: 36 in. diameter Neck: 7-5/8 in. to 7-7/8 in. projection from shell x 1/2 in. thick Flange: 3-3/4 in. x 1/2 in. thick Bolts: Number: 42 Size: 3/4 in. diameter x 2 in. long Cover Plate: Size: 44-1/2 in. x 1/2 in. thick Hinged: yes 1, 000, 000 Gallon Ground ,Storage Tank, ",Station 11 Tank" Page 6 Village of Mount Prospect, Illinois 15.119.H373.007 OVERFLOW PIPE: Size: 10 in. diameter Visible Air Break: yes Protective Screen: elastomeric check valve Brackets: Size: 4 in. x 5 in. x 3/8 in., flat bar Spacing: approx. 5 ft 2 in. SHELL, KNUCKLE, AND ROOF LADDER: Number of Rungs: Shell: 8 Knuckle: 6 Roof: 4 Distance From Ground to Lowest Rung: 9 ft 4 in. Width: 16 in. Side Rails: 2-1/2 in. x 3/8 in., flat bar Rung Size: 3/4 in. diameter Spacing: 12 in. on center Toe Room: 9-3/4 in. Brackets: Construction: welded Size: 3 in. x 3/8 in., flat bar x 81/2 in. long Spacing: approx. 8 ft 2 in. Safe -Climbing Device: none Vandal Deterrent: Size: 32 in. wide x 8 ft high aluminum Locked: yes ROOF SAFETY RAILING: Location: at roof access Handrail: Height: 42 in. Size: 2-1/2 in. x 2-1/2 in. x 3/8 in., angle Uprights: 2-1/2 in. x 2-1/2 in. x 3/8 in., angle Mid -Rail: Number: 2 Size: 2-1/2 in. x 3/8 in., flat bar Toe Bar: none Access Opening: Width: 19-1/2 in Closure Chains: yes 1, 000, 000 Gallon Ground ,Storage Tank, ",Station 11 Tank" Page 7 Village of Mount Prospect, Illinois 15.119.H373.007 Location: at two other roof manholes Handrail: Height: 42 in. Size: 2-1/2 in. x 2-1/2 in. x 3/8 in., angle Uprights: 2-1/2 in. x 2-1/2 in. x 3/8 in., angle Mid -Rail: Number: 2 Size: 2-1/2 in. x 3/8 in., flat bar Toe Bar: none ROOF OPENINGS: Manhole 41: Location: south side of roof Size: 24 in. diameter Type: hinged Curb: 4 in. x 3/16 in. thick Welded: exterior only Overlap: 2 in. x 3/16 in. thick Locked: yes Manhole 42 and 43: Location: east and west sides of roof Size: 30 in. diameter Type: hinged Curb: 6 in. x 1/4 in. thick Welded: interior and exterior Overlap: 2 in. x 1/4 in. thick Locked: yes Roof Vent: Type: clog -resistant Neck Height: 5 in. Neck Diameter: 24 in. Cover: 55 in. diameter 1, 000, 000 Gallon Ground ,Storage Tank, "Station 11 Tank" Page 8 Village of Mount Prospect, Illinois 15.119.H373.007 EXTERIOR COATING AND METAL CONDITION: Key to Table Adhesion 5 (very good) T = Topcoat to Underlying Coating Neg. = negligible 4 (good) 3 (fair) S = Primer to Steel 2 (poor) 1 (very poor) 0 (very poor) 1. Exterior Coating Condition: The beige coating on the exterior of the tank appeared to be in good condition and was providing adequate protection from corrosion to most of the steel. The exterior coating exhibited very good adhesion to the underlying steel. The coating appeared to be a polyurethane coating system. The Owner reported that the tank had been repainted in 2011. 2. Bottom Plate: The tank bottom plate extension appeared to be in nearly its original condition at the time of the field evaluation. Light debris and minor coating failures were observed on the bottom plate projection. Previous metal loss was observed on the bottom plate edge. The bottom plate overhung the beveled edge of the foundation in areas. Grass clippings were observed on the bottom plate projection. (See photos 13-21, 23-25, 29) 3. Shell Condition: The contour of the tank shell was good with significant discontinuities observed at the time of this field evaluation. The coating appeared to be in good overall condition as no significant coating failure and corrosion were observed. The coating exhibited very good adhesion to the steel. Small stone nicks and grass clippings were observed on the shell. Two tank nameplates were located on the southeast side of shell ring Al above the shell manhole. There was a 2 in. diameter cathodic protection coupling on shell ring 41. Two boxes and associated conduit and brackets were attached to the shell. (See photos 1-3, 8, 13-21, 23-27, 29-38) 4. Shell Manholes: The tank was equipped with two flanged and bolted circular manholes. One of the manholes was located on the southeast side of the tank, and the other manhole was located on the northwest side of the tank. The shell plate around each of the manholes was equipped with a reinforcing plate. There were open weep holes in the reinforcing plates. The manhole covers were equipped with davit arms. The bolts on the manhole covers appeared to be stainless steel. (See photos 1,30-33) 5. Overflow Pipe: The overflow pipe exited through the top shell ring and extended down the shell and discharged above a drainage catch basin. The discharge end was equipped with an elastomeric check valve. The pipe was equipped with welded steel brackets that appeared to be in their original structural condition at the time of this field evaluation. No significant coating failure was observed on the overflow pipe. The concrete block overflow catch basin was spalled and in poor condition. (See photos 25-28) Coating Thickness Approx. % Failure to Adhesion Metal Loss Range Typical Underlying Coating Rust Typical Deepest Shell 13.3 mils to 27.3 mils 17.5 mils Neg. Neg. 5S Neg. Neg. Roof 14.4 mils to 25.2 mils 20 mils Neg. Neg. 5S Neg. Neg. Key to Table Adhesion 5 (very good) T = Topcoat to Underlying Coating Neg. = negligible 4 (good) 3 (fair) S = Primer to Steel 2 (poor) 1 (very poor) 0 (very poor) 1. Exterior Coating Condition: The beige coating on the exterior of the tank appeared to be in good condition and was providing adequate protection from corrosion to most of the steel. The exterior coating exhibited very good adhesion to the underlying steel. The coating appeared to be a polyurethane coating system. The Owner reported that the tank had been repainted in 2011. 2. Bottom Plate: The tank bottom plate extension appeared to be in nearly its original condition at the time of the field evaluation. Light debris and minor coating failures were observed on the bottom plate projection. Previous metal loss was observed on the bottom plate edge. The bottom plate overhung the beveled edge of the foundation in areas. Grass clippings were observed on the bottom plate projection. (See photos 13-21, 23-25, 29) 3. Shell Condition: The contour of the tank shell was good with significant discontinuities observed at the time of this field evaluation. The coating appeared to be in good overall condition as no significant coating failure and corrosion were observed. The coating exhibited very good adhesion to the steel. Small stone nicks and grass clippings were observed on the shell. Two tank nameplates were located on the southeast side of shell ring Al above the shell manhole. There was a 2 in. diameter cathodic protection coupling on shell ring 41. Two boxes and associated conduit and brackets were attached to the shell. (See photos 1-3, 8, 13-21, 23-27, 29-38) 4. Shell Manholes: The tank was equipped with two flanged and bolted circular manholes. One of the manholes was located on the southeast side of the tank, and the other manhole was located on the northwest side of the tank. The shell plate around each of the manholes was equipped with a reinforcing plate. There were open weep holes in the reinforcing plates. The manhole covers were equipped with davit arms. The bolts on the manhole covers appeared to be stainless steel. (See photos 1,30-33) 5. Overflow Pipe: The overflow pipe exited through the top shell ring and extended down the shell and discharged above a drainage catch basin. The discharge end was equipped with an elastomeric check valve. The pipe was equipped with welded steel brackets that appeared to be in their original structural condition at the time of this field evaluation. No significant coating failure was observed on the overflow pipe. The concrete block overflow catch basin was spalled and in poor condition. (See photos 25-28) 1, 000, 000 Gallon Ground ,Storage Tank, "Station 11 Tank" Page 9 Village of Mount Prospect, Illinois 15.119.H373.007 6. Exterior Ladder: The exterior ladder was welded to brackets on the shell. The brackets appeared to be in good overall structural condition. The ladder side rails at the shell -to -knuckle were bolted, and one of the bolts was loose. The ladder was equipped with an aluminum hinged vandal deterrent that was locked. (See photos 30, 35-38, 40-42) 7. Roof Safety Railing: There was a safety-related deficiency noted: the roof safety railings were not equipped with toe bars. The roof was equipped with a safety railing at the roof access adjacent to the roof manholes. The safety railing was constructed from welded angle and flat bar members. The safety railing opening at the roof access was equipped with a closure chain. The closing mechanism in the closure chain had deteriorated. (See photos 1, 3, 30, 40-43, 46-49) S. Roof Condition: The contour of the roof was adequate at the time of this evaluation. The coating on the roof had very good adhesion to the steel. There were no significant areas of coating failure observed at the time of this field evaluation. Three or four minor rust spots and a few small areas of peeled coating were observed. (See photos 39-56) 9. Roof Manholes: The roof was equipped with three manholes. All of the manholes were equipped with hinged and locked covers. Previous metal loss was observed on the interior of the neck of one of the manholes. The roof manhole at the roof access was welded on the exterior only, but the other two manholes appeared to be welded on the interior and exterior. An interior rafter partially obstructed one of the manhole openings. (See photos 40-42, 44-49) 10. Roof Vent: The roof was equipped with a clog -resistant vent. The vent was equipped with pallets that would facilitate ventilation during filling or draining of the tank. The proper operation or design of the pallets was not verified during this evaluation. The vent pallets and screen appeared to be in good condition at the time of this evaluation. (See photos 54, 56-59) C. Interior Surfaces ROOF SUPPORT SYSTEM: Main Rafters: Number: 45 Size: 12 in. x 4 in. I-beam Purlins: approx. 1-1/2 in. x 1-1/2 in., angle Center Hub: Size: approx. 8 ft diameter Spokes: Number: 8 Size: approx. 12 in. x 3 in., channel Center Column: Size: 14 in. diameter pipe Base: Length: 12 in. x 2-7/8 in. x 6 ft 6 in. Width: 15 in. x 3 in. x 4 ft x 9 in. Guides: 5 in. x 1/2 in. x 6 in. long 1, 000, 000 Gallon Ground ,Storage Tank, ",Station 11 Tank" Page 10 Village of Mount Prospect, Illinois 15.119.H373.007 KNUCKLE PERIMETER ANGLE: 5 in. x 2-1/2 in. x 1/4 in. CATHODIC PROTECTION: Anodes: submerged wire w/ floats Manufacturer: Harco Model Number: TASCA 30-082 Serial Number: C-96507 Brackets: Number: 12 Size: 3/8 in. diameter Reference Electrodes: near tank center at column base OVERFLOW: Inlet Type: funnel Location: above bottom of rafters BAFFLE WALL: Height: 5 ft x 1/4 in., plate Length: approx. 45 ft Vertical Braces: Number: 10 Size: 3 in. x 1/2 in., channels Diagonal Braces: Number: 4 Size: 3 in. x 3 in. x 1/4 in., angles INTERIOR PIPING: Inlet/Outlet Pipe: Size: 16 in. diameter Projection: 5-1/2 in. above floor Protective Cover: none Recirculating Pipe: Size: 10 in. diameter Projection: 47 in. above floor 1, 000, 000 Gallon Ground ,Storage Tank, "Station 11 Tank" Page 11 Village of Mount Prospect, Illinois 15.119.H373.007 INTERIOR COATING AND METAL CONDITION: Key to Table Adhesion 5 (very good) T = Topcoat to Underlying Coating Neg. = negligible 4 (good) 3 (fair) S = Primer to Steel 2 (poor) 1 (very poor) 0 (very poor) 1. Interior Coating Condition: The white coating on the interior surfaces of the tank appeared to be in good condition and was providing adequate protection from corrosion to most of the underlying steel. Coating adhesion tests were only performed on the roof to avoid destructive testing of the coating below the water level. 2. Roof Condition: The coating on the roof plates appeared to be in good to fair overall condition. Rust staining was noted along the tops of the roof rafters, along the roof plate lap seams, along the rafter edges. The interior roof support structure consisted of radial roof rafters, a center column spokes, two sets of purlins, and a knuckle perimeter angle. The inner ends of the roof rafters rested on a center hub that was located at the top of the center column. The outer ends of the rafters were equipped with clips at the knuckle perimeter angle. The clips appeared to be approximately 4 in x 3 in., flat bar. Previous pitting was observed on the rafter clips. Some of the purlins were larger than the others, approximately 2-1/2 in. x 2-1/2 in., and some of the purlins were oriented diagonally. Some of the purlins were in poor condition and in danger of falling. The center hub was equipped with eight radial spokes and 2 ft square top plates under an approximately 3 ft diameter ring. The knuckle perimeter angle was intermittently welded to the knuckle. Thick caulking was observed on some of the rafters, and it appeared that the caulking was trapping moisture against the steel. Corrosion was observed on the tops of the roof support members, and corrosion and previous metal loss were observed on the roof surfaces. It is the opinion of Tank Industry Consultants that personnel should not access the tank until the roof purlins have been secured. (See photos 60-82, 85-90) 3. Shell Condition: The coating on the shell interior appeared to be in very good overall condition. There was no significant coating failure or corrosion observed on the interior shell surface at the time of this field evaluation. (See photos 62, 65-66, 85-86, 91-95, 97, 99, 10 1) 4. Overflow Pipe: The overflow pipe was equipped with a fiunnel-type inlet. The location of the overflow inlet was such that the top capacity level was above the bottoms of the roof rafters; however, it did not appear that the tank was operated at full capacity and the typical water level was approximately 6 in. below the bottoms of the rafters. (See photos 82-84) 5. Baffle Wall: The tank was equipped with an interior baffle wall adjacent to the shell manhole. The wall extended approximately 30 ft out from shell, and then angled and extended an additional 15 ft. The baffle wall was approximately 5 ft tall and equipped with vertical and diagonal Coating Thickness Range Typical % Failure to Primer Rust Adhesion Metal Loss Typical Deepest Roof 8 mils to 15 mils - Neg. < 1/2% 5S Neg. Neg. Shell 13.7 mils to 19.7 mils 17 mils Neg. Neg. - Neg. Neg. Floor 16.1 mils to 19.3 mils 16.5 mils Neg. Neg. - Neg. Neg. Key to Table Adhesion 5 (very good) T = Topcoat to Underlying Coating Neg. = negligible 4 (good) 3 (fair) S = Primer to Steel 2 (poor) 1 (very poor) 0 (very poor) 1. Interior Coating Condition: The white coating on the interior surfaces of the tank appeared to be in good condition and was providing adequate protection from corrosion to most of the underlying steel. Coating adhesion tests were only performed on the roof to avoid destructive testing of the coating below the water level. 2. Roof Condition: The coating on the roof plates appeared to be in good to fair overall condition. Rust staining was noted along the tops of the roof rafters, along the roof plate lap seams, along the rafter edges. The interior roof support structure consisted of radial roof rafters, a center column spokes, two sets of purlins, and a knuckle perimeter angle. The inner ends of the roof rafters rested on a center hub that was located at the top of the center column. The outer ends of the rafters were equipped with clips at the knuckle perimeter angle. The clips appeared to be approximately 4 in x 3 in., flat bar. Previous pitting was observed on the rafter clips. Some of the purlins were larger than the others, approximately 2-1/2 in. x 2-1/2 in., and some of the purlins were oriented diagonally. Some of the purlins were in poor condition and in danger of falling. The center hub was equipped with eight radial spokes and 2 ft square top plates under an approximately 3 ft diameter ring. The knuckle perimeter angle was intermittently welded to the knuckle. Thick caulking was observed on some of the rafters, and it appeared that the caulking was trapping moisture against the steel. Corrosion was observed on the tops of the roof support members, and corrosion and previous metal loss were observed on the roof surfaces. It is the opinion of Tank Industry Consultants that personnel should not access the tank until the roof purlins have been secured. (See photos 60-82, 85-90) 3. Shell Condition: The coating on the shell interior appeared to be in very good overall condition. There was no significant coating failure or corrosion observed on the interior shell surface at the time of this field evaluation. (See photos 62, 65-66, 85-86, 91-95, 97, 99, 10 1) 4. Overflow Pipe: The overflow pipe was equipped with a fiunnel-type inlet. The location of the overflow inlet was such that the top capacity level was above the bottoms of the roof rafters; however, it did not appear that the tank was operated at full capacity and the typical water level was approximately 6 in. below the bottoms of the rafters. (See photos 82-84) 5. Baffle Wall: The tank was equipped with an interior baffle wall adjacent to the shell manhole. The wall extended approximately 30 ft out from shell, and then angled and extended an additional 15 ft. The baffle wall was approximately 5 ft tall and equipped with vertical and diagonal 1, 000, 000 Gallon Ground ,Storage Tank, "Station 11 Tank" Page 12 Village of Mount Prospect, Illinois 15.119.H373.007 braces. There was a 20 in. wide sliding gate access adjacent to the shell wall. The coating on the baffle wall and braces was in good overall condition. (See photos 91-96) 6. Bottom Plate Condition: The coating on the tank bottom appeared to be in good overall condition. Previous pitting up to 0.08 in. deep was observed. (See photos 85-87, 89, 91-98, 100-107) 7. Interior Piping: The inlet/outlet pipe was located in the tank floor. The inlet/outlet pipe projected approximately 5-1/2 in. above the bottom plates. The inlet/outlet pipe was not equipped with a protective cover. The tank was equipped with dished drain sumps at each of the shell manholes, approximately 3 ft from the shell. The sumps were 32 in. in diameter and the center depth was approximately 8-1/2 in. The tank was equipped with a recirculating pipe. The recirculating pipe was approximately 39 ft from the tank shell, projected approximately 47 in. above the bottom plate, and was equipped with an elbow. The tank was also equipped with a pressure sensor pipe that projected approximately 5 in. above the bottom plate. The inlet/outlet pipe, the recirculating pipe, and the pressure sensor pipe were all equipped with a reinforcing pad. (See photos 94, 103-107) 8. Cathodic Protection: The tank was equipped with a cathodic protection system. The system consisted of a wire anode and floats. The cathodic protection anode system anchored from the lower portions of the shell. The wiring appeared to be intact. It appeared as though the cathodic protection system was operating properly as no significant corrosion was observed at the areas of coating failure below the high water line. The reference anode was located near the center of the tank adjacent to the center column base. The cathodic protection equipment cabinet was located in the pump house which housed an automatically controlled potential rectifier. (See photos 12, 85-86, 91- 94,97-104) RECOMMENDATIONS: A. Foundation and Site I. Site Maintenance: The site should be regraded so that the top of the foundation projects a minimum of 6 in. to a maximum of 12 in. above grade and so that proper drainage away from the foundation occurs. Site maintenance should be performed with the mower discharge directed away from the base of the tank to prevent rock chips in the coating and the accumulation of grass on the bottom plate. Vegetation on the bottom plate and on or near the shell should be removed and should not be allowed to encroach on the foundation or steel in the future. The equipment and debris around the tank should be removed to prevent it from coming in contact with the tank or foundation and causing damage. 2. Site Access and Restoration: Provisions should be included in the specifications for the restoration of any paving, curbing, sidewalks, fences, sod, or other surfaces and structures disturbed by the contractor's work. 3. Tank and Site Security: Water tanks have been defined by some courts under certain circumstances as attractive nuisances. As such, there may be a significant potential liability to the Owner for injury to persons on the tank and tank site, even if access is not authorized. Recent events have prompted the entire water industry to consider measures that inhibit intentional acts that could threaten the water supply. A review of the security requirements for the tank and site is recommended 1, 000, 000 Gallon Ground ,Storage Tank, "Station 11 Tank" Page 13 Village of Mount Prospect, Illinois 15.119.H373.007 to confirm that the existing measures are consistent with the Owner's security requirements for their water system. Primary tank and site security should be focused on eliminating, preventing, and detecting unauthorized access to the tank. Such security measures might include routinely and periodically verifying all manholes and the ladder vandal deterrent are locked. Other security measures might include installing no -trespass signs, cutting the vegetation away from the tank to improve visibility, or installing a fence, installing barbed wire, upgrading the existing site lighting, adding motion detectors on the site, installing surveillance cameras, installing alarms on tank manholes, and arranging more frequent site visits by law enforcement agencies. 4. Foundation: If the foundation should deteriorate prior to performing other tank rehabilitation operations, any unsound concrete should be chipped to sound material and the concrete should be brush-off blasted. Any deteriorated areas or voids found should have a bonding agent and a vinyl emollient modified concrete patching mortar applied to build up the surface to its original contour. The concrete should then be painted with a concrete sealer. 5. Sealant Maintenance: When the exterior repainting is performed, the existing sealant and any vegetation located between the bottom plate and the foundation should be removed and replaced with a flexible polyurethane sealant. 6. Valve Vault: The piping and valves located in the valve vault should be cleaned and painted in accordance with the interior coating recommendations at the time of the tank cleaning and coating. The exterior concrete surfaces should be cleaned to the equivalent of a brush-off blast cleaning and painted with a concrete sealer. The valve vault access should continue to be locked at all times in order to limit liability to the Owner and to protect water system security. Freeze protection should be provided for on all control piping and static water lines. B. Exterior Surfaces 1. Life of the Exterior Coating: The exterior coating system appeared to be providing good protection to the majority of the steel surfaces. Tank Industry Consultants believes that the exterior of the tank should not need to be painted within the next 5 to 7 years from a corrosion standpoint. However the exterior should be reevaluated in 3 to 5 years, in accordance with AWWA recommendations, to determine a more precise recoating schedule. The exterior coating system should be evaluated immediately prior to preparing specifications to determine if the coating adhesion is still adequate to accept a topcoat. 2. Coating Testing: Prior to preparation of specifications for the cleaning and coating of the exterior of the tank, samples of the exterior coating system should be subjected to laboratory analysis to test for ingredients which may at that time be subject to regulations concerning their handling and disposal. 3. Cleaning: When the exterior is to be cleaned, all varieties of containment should be investigated. Containment of the wind-blown debris will be required, and containment of paint droplets will be required due to the proximity of the adjacent golf course and buildings. 4. Recommended Coating System: 1, 000, 000 Gallon Ground ,Storage Tank, "Station 11 Tank" Page 14 Village of Mount Prospect, Illinois 15.119.H373.007 a. Spot Clean and Topcoat: If the exterior is to be repainted within the next few years, then spot cleaning and topcoating the tank appears to be the recommended option. The typical life of a spot cleaned and topcoated system is approximately 7 to 8 years, but is highly dependent on previous surface preparation and the condition of the underlying coating system. b. Coating Application: The entire exterior surfaces of the tank should be high- pressure washed to remove chalked coating, mildew, and contaminants. After washing, the damaged and rusted areas should be spot cleaned to the equivalent of an SSPC-SP 6, Commercial Blast Cleaning, or SSPC-SP 11, Power Tool Cleaning to Bare Metal. All areas of excessive coating thickness and runs in the coating should be cleaned to the equivalent of an SSPC-SP 7, Brush -Off Blast Cleaning, to remove the excessive mils. The spot cleaned areas should receive a spot prime coat compatible with the present coating system. The entire exterior surfaces should then be topcoated with a compatible coating system. 5. Alternative Coating System: a. Complete Cleaning and Repainting: The optimum long -life coating system presently available for this site is an epoxy -polyurethane coating system. Properly formulated and applied polyurethanes have good resistance to condensation, mildew, and chipping. The polyurethanes also have excellent color and gloss retention and the longest expected service life of any of the common exterior tank coatings. The typical life of a properly applied [zinc -]epoxy - polyurethane coating system is approximately 15 to 20 years. These coatings are also presently manufactured to meet current VOC requirements. b. Coating Application: The entire tank exterior should be cleaned to the equivalent of an SSPC-SP 6, Commercial Blast Cleaning and have an epoxy -primed, epoxy intermediate and polyurethane finish coating system applied. However, care must be taken during the application of this particular coating system because this coating does have poor dry -fall characteristics, and potential damage to the surrounding property must be taken into consideration. The polyurethane coatings also require close monitoring of temperature and humidity during application. 6. Effective Service Life: Tank Industry Consultants defines the life of a coating as the amount of time before repainting becomes necessary due to coating failure and corrosion. During the coating life the Owner should expect the coating to lose its gloss, start to chalk, show signs of weathering, and possibly some rust staining. Future touch-up may be required on isolated coating failures. If aesthetics are a concern, the Owner may have to topcoat the repainted tank prior to the end of the expected service life. However, future topcoating would be less expensive than complete cleaning and recoating and could delay the next complete cleaning and repainting for many years. 7. Other Systems: With air emission volatile organic compounds (VOC) restrictions being put in place around the nation, alternative coating systems may become available which would be viable options for this tank. The Owner should review the available systems prior to preparing specifications for the recoating project. S. Coating Curing: It would be more economical to paint the tank exterior at the same time the interior is painted, since the tank must be drained while the exterior is painted, and the applied coatings cure. This will also reduce mobilization and observation costs. 1, 000, 000 Gallon Ground ,Storage Tank, "Station 11 Tank" Page 15 Village of Mount Prospect, Illinois 15.119.H373.007 9. Rehabilitation Schedule: To obtain the lowest possible prices for the work outlined in the recommendations, the Owner should have the specifications prepared and the work bid in the spring, with the work scheduled to start in early summer (if possible). 10. Grinding and Bracket Removal: Any unused brackets or erection hugs should be removed prior to the exterior repainting. Any weld burrs, weld spatter, or erection scars should be ground off to provide a smooth surface for the application of the coating. 11. Nameplates: The tank nameplates should be removed for the cleaning and coating of the tank. The nameplates should be cleaned and reattached to the tank using the existing brackets. 12. Electrical Apparatus: All unused electrical conduit, antennas, fixtures, electrical metering equipment, cathodic protection apparatus, and control cabinets should be removed from the tank and tank site. All required equipment should be repaired and maintained in accordance with the National Electric Code (NEC). 13. Shell Manholes: The weep holes in the shell manhole reinforcing plates should be tapped and plugged. 14. Overflow Pipe: The overflow pipe catch basin should be repaired or replaced. 15. Exterior Ladder: The bolted connection between the shell ladder and roof knuckle ladder should be removed and the ladder side rails welded together. 16. Roof Safety Railing: The existing safety railings should be equipped with toe bars. The deteriorated closing mechanism on the closure chain should be replaced. 17. Clog -Resistant Vent: The proper operation of the vacuum and pressure relief pallets should be routinely verified. C. Interior Surfaces 1. Life of the Interior Coating: The interior coating system appeared to be in generally good condition and providing adequate corrosion protection. Tank Industry Consultants recommends that the interior surfaces of this tank should not need to be recoated in 5 to 7 years. However, the interior recoating schedule will be dictated by the coating failure observed above the top capacity level. It is recommended that when the interior is completely cleaned and repainted, an epoxy coating system should be used. 2. Coating Testing: Prior to preparation of specifications for the cleaning and coating of the interior of the tank, samples of the interior coating system should be subjected to laboratory analysis to test for ingredients which may at that time be subject to regulations concerning their handling and disposal. 3. Recommended Interior Coating System: a. Epoxy Coating System: The optimum long -life coating system presently available for the interior of water tanks is a two -component epoxy coating system. A three -coat epoxy 1, 000, 000 Gallon Ground ,Storage Tank, "Station 11 Tank" Page 16 Village of Mount Prospect, Illinois 15.119.H373.007 system is recommended for the interior of this tank. This coating system should meet the certification criteria of ANSVNSF 61 and state department of health regulations. b. Coating Application: When the interior is to be repainted, the entire tank interior should be cleaned to the equivalent of an SSPC-SP 10, Near -White Blast Cleaning and an epoxy coating system applied. C. Service Life: The typical life of a properly formulated and applied epoxy coating system is approximately 12 to 15 years in immersion service. Tank Industry Consultants defines the life of a coating as the expected service life before repainting becomes necessary due to coating failure and corrosion. The Owner could extend the service life of the coating by installing, properly maintaining and operating a cathodic protection system to help protect the steel surfaces in areas which have experienced coating failure. 4. Roof Support Structure: The deteriorated purlins should be removed from the roof and replaced. At the time of the interior cleaning and painting, the tops of the roof rafters should be carefully cleaned and coated. 5. Cathodic Protection: Cathodic protection, if used and maintained properly, will control active corrosion below the water level and extend the useful life of a coating system. It should be noted that maintenance as recommended by the cathodic protection manufacturer is required for the cathodic protection system to work properly. Without proper monitoring, the cathodic protection system may operate too high and cause the coating to blister, or the system may operate too low and not adequately protect the exposed steel surfaces. 6. Pit Welding and Pit Filling: After initial cleaning, all significant pitting which is found should be welded, and all pitting with rough edges that would make the pitting difficult to coat properly should be filled with a solventless epoxy seam sealer. 7. Seam Sealing: The existing roof manhole and existing roof vent intersections should be sealed with an epoxy seam sealer at the time of the interior recoating. S. Flexible Sealant: The perimeter ring -to -roof interface and the unwelded lapped roof seams should be sealed with a flexible sealant at the time of the interior recoating. 9. Rough Edges: All unused brackets should be removed from the interior and exterior surfaces at the time of the next recoating. Any weld burrs, spatter, scars or rough edges in the steel should be ground smooth to provide a better surface for coating. 10. Overflow Inlet: The overflow inlet should be lowered so that the high water line is below the bottom of the rafter ends. 1, 000, 000 Gallon Ground ,Storage Tank, "Station 11 Tank" Page 17 Village of Mount Prospect, Illinois 15.119.H373.007 ECONOMIC FACTORS: Item Replacement of tank with a new one Cost Life in Years $ 1,600,000' 75+ The following is a complete list of repairs and estimated costs for their respective recommendations found in the RECOMMENDATION section of this report. Item Sanitary & Safety Scheduled Maintenance Repairs Clean and Paint Exterior: Fowidation Repair 3,000 Spot Repair and Topcoat 2,000 $ 150,000 Containment Lower Overflow Inlet 90,000 SP 6, Complete Clean, Epoxy/Polyurethane System 60,000 225,000 Containment Total of Engineer's Recommendations 120,000 Clean and Paint Interior: SP 10, 3 -Coat Epoxy System 420,000 Miscellaneous Chipping and Grinding 2,000 Seam Sealing 20,000 Foundation Repair 3,000 Replace Deteriorated Roof Purlins $ 50,000 Repair Shell -to -Roof Knuckle Ladder Connection 2,000 Install Toe Bars on Roof Safety Railing (3) 8,000 Lower Overflow Inlet 2,000 Contingency Items 8,000 10,000 Estimates are believed to be a high average of bids that would be received in 2015. I The replacement estimate includes costs associated with new tank fabrication and erection, foundation, painting, and engineering. The budget estimate given does not include costs associated with tank demolition, site acquisition, and distribution interruptions. The following economic factors include only those work items that the Engineer believes to be the minimum to properly maintain this tank from an operational standpoint. Other items related to safety and risk management should be evaluated by the Owner. Item Cost Replace Deteriorated Roof Purlins $ 50,000 Fowidation Repair 3,000 Repair Shell -to -Roof Knuckle Ladder Connection 2,000 Install Toe Bars on Roof Safety Railing (3) 8,000 Lower Overflow Inlet 2,000 Contingency Items and Touch -Up Coating Damaged by These Items 60,000 Total of Engineer's Recommendations $ 125,000 Tank Industry Consultants has no control over the cost of labor, materials, or equipment, or over the contractors' methods of determining prices, or over competitive bidding, or the market conditions. Opinions of probable cost, as provided for herein, are to be made on the basis of our experience and qualifications and represent our best judgment as design professionals familiar with the design, 1, 000, 000 Gallon Ground ,Storage Tank, "Station 11 Tank" Page 18 Village of Mount Prospect, Illinois 15.119.H373.007 maintenance, and construction of concrete and steel plate structures. However, Tank Industry Consultants cannot and does not guarantee that proposals, bids, or the construction cost will not vary from opinions of probable cost prepared for the Owner. Due to the numerous potential scopes of work which exist, the Owner should obtain an updated budget estimate once the final scope of work has been determined. This would enable the Owner to accurately budget monies for additional mobilization costs and damaged coating rehabilitation costs. Engineering and resident observation costs are not included in the Total of the Engineer's Recommendations because these fees are dependent upon the scope of work to be performed. Tank Industry Consultants performs all facets of the engineering services which would be required for this project. Estimated fees for engineering and resident observation will be furnished upon request. CLOSURE: Brief Summation: The Village of Mount Prospect, Illinois owns and operates a 1,000,000 gallon ground storage tank that was in good overall condition at the time of this evaluation with the exception of deteriorated purlins in the interior roof support structure. Proper maintenance after completing the recommendations herein would include periodic washouts and evaluations approximately every 3 to 5 years in accordance with AWWA recommendations, and the proper maintenance of the existing ice - resistant cathodic protection system with long -life anodes. Contractor Selection: The work should be performed by a competent bonded contractor, chosen from competitive bids taken on complete and concise specifications. The coatings used should be furnished by an experienced water tank coating manufacturer, supplying the field service required for application of technical coatings. Standards for Repairs and Coatings: All work done and coatings applied should be applied in accordance with NACE, ANSI/NSF Standard 61, the manufacturer's recommendation, AWWA D100 and AWWA D102 (latest revisions), and the SSPC: The Society for Protective Coatings. Observation of Work: Observation of the work in progress by experienced personnel will offer additional assurance of quality protective coating application. Observations can be performed on a continuous basis or spot (critical phase) basis. The actual cost of observation may be less using spot as opposed to full-time resident observation; however, with spot observation it is often necessary for work to be redone to comply with the specifications. This somewhat lowers the quality of the finished product, lengthens the job, and is frequently a cause of conflict between the contractor, Owner, and field technician. Resident full-time observation minimizes the amount of "rework" required. Anniversary and Maintenance Evaluations: An anniversary evaluation should be conducted prior to the end of the one year bonded guarantee. Washouts and coating, structural, sanitary, safety, and corrosion evaluations should be conducted not less than every three years. Time Frame: If the work is not performed within the next 6 months, the structure should be reevaluated prior to the preparation of specifications and solicitation of bids. 1,000,000 Gallon Ground Storage Tank-, "Station 11 Tank Page 19 Village of Mount Prospect, 15.119,H373.007 Specifications and Bidding Documents: The recommendations in this report are not intended to be specifications on which a contractor can bid. Complete bidding documents must include general and special conditions, detailed technical specifications, and other information necessary for the competitive bidding process. To properly protect the interests of the Owner, Contractor, and Engineer; the initial evaluation, the technical specifications, legal portions of the contract documents, and the observation should be perl-brmed by the same firm or with close coordination of all parties involved. Limitations of Evaluation: It is believed that the conditions reported herein reflect the condition of the tank as observed on the date of the evaluation, using reasonable care in making the observations, and safety in gaining access to the tank. Should latent defects be discovered during the cleaning of the structure, they should be brought to the attention of the Owner and the Engineer. Seismic and Wind Loadings: This tank is located in or near a region of low seismic activity. This evaluation and the reporting of the condition of this tank do not warrant the structural condition of the tank or any of the original design for seismic loadings. Likewise, recommendations for this tank do not include modifications which may be required for compliance with present structural codes. It is possible the tank was erected in compliance with pre-existing industry standards which have since been replaced by more restrictive standards. Hazardous Materials in Coatings: It should be taken into consideration that Federal, State, and local environmental agencies have placed stricter controls on the removal of lead-based and other heavy- metal based coatings from steel structures by the use of conventional abrasive blasting techniques. The paint and blast residue may be considered to be hazardous waste depending on the concentration of lead or other particles in residue. Please contact Tank Industry Consultants if you have any questions or comments. Respectfully submitted, Tank Industry Consultants Penni Snodgrass Technical Editor Gregory R. "Chip" Stein, P.E. Managing Principal R 0 �, Copyright @ 2015, Tank Industry Consultants All Rights Reserved Of w F- Z O_ H U- Q O J d J W d z `t O O O Ll F- 0 1-1 af O O J Y Z Q LL O O Z H � Z 7 Ca 0 O QO C)G w � w � w Q Z � � � � o Ld o J J 2 V) C p�p C O U T L J a � bi O 2 Y 47 W V) J LL O LL O J w � �m O FY O 2 aL t0) e Classification of Adhesion Test Results Method A — X Cut Tape Test Surface Clossl-tication Approx. 1.5 in. long cuts at 30 deg. to 45 deg. apart The edges of tho cuts are completely smooth; No Fallure 5 No peelirig or removal. X5 Small flakes of the coating are detached at Trace peeling or removal along incisions. 4 Jagged removal along incisions up to 1/16 in. 3 (1.6mm) on either We. HULL Jagged removal along most of incisions up to 1/8 in. 2 (3.2mm) on either side_ Removal from most of the area of the X under the A LULL70 Ery -F 1 tape. 2 - to 35% of the lattice. to Removal beyond the area of the X. O Method 5 — Lattice Cut Tape Test Surface Classlfcation Six parallel cuts at 2mm apart The edges of tho cuts are completely smooth; No Fallure 5 none of the squares of the lattice are detached_ Small flakes of the coating are detached at intersections; less than 5% of the lattice is 4 affected. Small flakes of the coating are detached along HULL edges and at intersections of cuts. The area 3 affected Is 'S% to 15% of the lattice_ The coating has flaked along the edges and on A LULL70 Ery -F parts of the squares. The area affected is 15% 2 - to 35% of the lattice. to The coating has -faked along the edges of cuts in large ribbons and whole squares have detached_ � The area affected is 35% to 65% of the lattice. Flaking and detachment worse than grade 1. d ASTM 3359 Standard Test Methods for Measuring Adhesion by Tope Test Tank Industry Consultants 7740 West New York Street Indianapolis, Indiana 46214 Telephone — 317/271-3100 FAX -- .317/271-3300 - CERTIFICATE OF ANALYSIS - Client ID: TANK INDUST Tank Industry Consultants 7740 West New York Street Indianapolis, Indiana 46214 Attn: Julie White Our Lab # 15009958-001 Your Project # 15.119.H373.007 Your Project Name: Paint Samples Sample Type: Paint Chips Report Date: 14 -Jul -15 06.16 PM Phone: (317) 271-3100 FAX: (317) 271-3300 Your Sample ID: Exterior Shell Sample Composition: Grab Collection Date: 07/08/15 Collected By: Client Receipt Date: 07/10/15 10:30 Total Metals, ICP -AES Analytical Method Prep Method Prep Date By SW846 6010B SW846 3050B 7/13/2015 amyers Quant. Analysis Parameter Result Units Qual Limit CAS # Date By Cadmium, Cd < 25.0 mg/kg 25.0 7440-43-9 07/13/15 spotts Chromium, Cr < 250 mg/kg 250 7440-47-3 07/13/15 spotts Lead, Pb 806 mg/kg iiiiiiiiiiiiiiiiiiiiilillillillillillilI 11 250 7439-92-1 07/13/15 MEN= spotts Our Lab # 15009958-002 Your Project # 15.119.H373.007 Your Project Name: Paint Samples Sample Type: Paint Chips Your Sample ID: Interior Manhole Neck Sample Composition: Grab Collection Date: 07/08/15 Collected By: Client Receipt Date: 07/10/15 10:30 ICP-AESTotal Metals, Date By SW846 6010B SW846 3050B7/13/2015 amyers Quant. Analysis Parameter Result Units Qual Limit CAS # Date By Cadmium,. < 25.0 mg/kg 25.0 1 1spotts Chromium, Cr < 1 mg/kg 250 1 1spotts Lead, Pb < 250 mg/kg 250 1spotts Lab 4 15009958-002 Sample 1 ' • •1 - Laboratories -1471 FAX (317) 290-1670 1 WEST RAYMOND... . - -how,INDIANAPOLIS, 7/14/2015 Lab Manager Date Lab # 15009958-002 Sample ID: Interior Manhole Neck ESG Laboratories 5940 WEST RAYMOND STREET INDIANAPOLIS, INDIANA 46241 Page 2 (?f2 PHONE (317) 290-1471 FAX (317) 290-1670 www.ESGLaboratories.com 1. Tank, pump house, and site. In 2. Brush pile and gravel mound on tank site. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 3. Equipment and debris stored on site. 4. Antenna pole adjacent to tank. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 5. Buildings adjacent to tank. 6. Poles adjacent to tank. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 7. Wooded area adjacent to tank. Valve vault cover. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 9. Interior of valve vault. 10. Piping and valves in vault. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 11. Vault pipe penetration. 12. Cathodic protection rectifier cabinet. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 13. Equipment stored near tank. 14. Vegetation growing between bottom plate and foundation. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 15. Corrosion on bottom plate edge. 16. Sealant and voids at bottom plate -to -foundation. Note dried vegetation clippings on foundation and shell. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 17. Bottom plate overhangs beveled foundation. 18. Corrosion and metal loss on bottom plate edge. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 bW'IV�VI ""'vwn 19. Voids in sealant. 20. Voids in sealant and corrosion on bottom plate edge. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 21. Corrosion on bottom plate edge. 22. Water being discharged from tank. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 23. Tank shell. 24. Conduit and boxes attached to tank shell. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 25. Overflow pipe and catch basin. 26. Elastomeric check valve on overflow discharge. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 27. Overflow pipe bracket. 28. Interior of overflow catch basin. Village ofMount Prospect "Station llTank" Mount Prospect, Illinois 29. Piping between tank and pump house. 30. Tank shell, shell manhole, ladder, and roof safety railing. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 31. Shell manhole, cover, and tank nameplates. 32. Tank nameplates. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 33. Shell manhole and cover. 34. Spot coating failure and corrosion on shell. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 35. Shell ladder vandal deterrent. 36. Shell ladder and hinged vandal deterrent. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 37. Shell ladder bracket and rung. 38. Loose bolt on shell -to -knuckle ladder connection. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 39. Roof knuckle. 40. Roof access, ladder, safety railing, and roof manhole. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 41. Roof ladder. 42. Closure chain on roof safety railing. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 43. Corroded closing mechanism on safety railing closure chain. 44. Roof manhole and cover. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 45. Previous pitting on roof manhole neck. 46. Roof manhole, cover, and safety railing. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 47. Roof manhole and ladder. Note interior rafter limits access opening. 48. Roof manhole, cover, and safety railing. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 49. Roof manhole and cover. 50. Roof exterior coating. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 51. Roof exterior coating. 52. Spot coating failure and corrosion on roof exterior. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 53. Spot coating failure to underlying coating on roof exterior. 54. Roof and roof vent. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 55. Irregular roof contour. 56. Clog -resistant roof vent. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.H373.007 57. Vent cover. 58. Vent pallets. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 59. Vent screen. 60. Interior roof support structure. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 61. Rust staining on interior roof support structure. 62. Interior roof support structure. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 63. Interior roof support structure. 64. Rust staining on roof rafters and purlins. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 65. Rust staining on roof knuckle and perimeter ring. 66. Roof perimeter ring, rafters, and purlins. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 67. Rust staining on roof plate edges, rafters, and purlins. 68. Surface rust on roof plate edges and rafters. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 69. Surface rust on roof plate edges and rafters. 70. Surface rust on roof plate edges and rafters. Note intermittent caulking at roof -to -rafter junction. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 71. Corrosion on top of roof rafter. 72. Corrosion on top of roof rafter and perimeter ring. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 73. Corrosion on top of roof rafter and perimeter ring. 74. Corrosion on top of roof rafter and perimeter ring. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 75. Corrosion on top of roof rafter. 76. Previous metal oss on rafter edge. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 77. Cracked coating and corrosion on rafter. 78. Corrosion on roof plates and purlin. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 79. Corrosion on top of roof rafters and purlin. 80. Corrosion on top of roof rafters and purlin. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 81. Corrosion on top of roof rafters and purlin. 82. Overflow funnel. Note that overflow level is above bottom edge of roof rafter. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 iir(( A' r14 83. Overflow pipe penetration and funnel. 84. Overflow pipe penetration and funnel. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 85. Cathodic protection system on tank interior. 86. Interior shell, floor, and base of center column. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 87. Center column base. 88. Corrosion and rust staining on center column base. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 89. Corrosion and rust staining on center column base at floor. 90. Corrosion on center column at base. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 91. Baffle wall on tank interior. 92. Baffle wall on tank interior. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 93. Cathodic protection equipment in tank. 94. Shell manhole opening. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 95. Sediment being removed from tank floor. 96. Sliding gate access door at base of baffle wall. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 97. Cathodic protection reference anode in tank. 98. Cathodic protection equipment in tank. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 99. Cathodic protection system bracket on shell wall. 100. Cathodic protection reference anode in tank. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 1r/ ii i ii� vo i „moi r 1 %% %�>J�f�rGi�r�iisw%rt... 10 1. Tank floor. 102. Sediment on tank floor. Village of Mount Prospect "Station I I Tank" Mount Prospect, Illinois 15.119.1-1373.007 103. Recirculating pipe penetration in tank floor. 104. Recirculating pipe. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007 105. Pressure sensor pipe in floor. 106. Inlet/outlet pipe penetration in floor. Village of Mount Prospect "Station 11 Tank" Mount Prospect, Illinois 15.119.1-1373.007