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HomeMy WebLinkAboutSouth Bend Potawatomi Pool Facilities Assessment-Final 22-11-reducedCounsilman-Hunsaker •50+ Years of Aquatic Engineering & Design •Core Services •Feasibility Studies •Facility Audits •Design Services •Aquatic Operations •Web-Apps •Market Sectors •K-12 & Higher Education •Parks & Recreation •Waterparks •Hospitality •Wellness •Office Locations •St. Louis, MO •Dallas, TX •Denver, CO •Ann Arbor, MI •San Diego, CA Architectural –Functionality & Support Spaces •ADA Accessibility •Family Changing •Finishes •Deck •Security Pool Structure & Finish •Dive Pool •Fair to satisfactory condition with no significant cracking or spalling •Liner delamination •Lap Pool •Very poor condition at base slab with widespread and extensive cracking •Cracks in the slab have extended up into the pool shell walls in approximately 7 locations •Cracking has continued to progress and interconnect, forming a spiderweb of cracks across nearly the entire bottom surface •Prior surface patches in the concrete base slab have failed with vertical separation/heaving noted at nearly all repairs. Existing concrete under failed surface patching was found to be heavily delaminated Field Documentation 9/26/22 Short-Term Repair Option Explored •Full / Partial slab removal with patching •Geofoam interstitial layer below partial new floor slab at 3.5-4.0 feet deep •Short-Term Repair Costs to Re-Open: $2.0m •Labor availability •Limited life expectancy compared to new construction •Long-Term Repairs for Total Renovation: $5.7m Pool Piping & Water Loss •14,000 gallons / day •Buried cast iron piping and fittings original to 1955 construction transitions to PVC once in the basement mechanical room •No visible signs of settling or subsurface issues •Piping undersized based on current code, especially for perimeter overflow Code & Safety Compliance •ADA passed in 2010 covers accessibility to new and existing pools •Virginia Graeme Baker Pool & Spa Safety Act passed in 2007 for drain covers •Minimum water depth for diving Pool Mechanical & Chemical Treatment Systems •Vertical sand filtration –1996 •Manufacturer no longer in business •Unaware of last media change •Filtration rate of 19.5 GPM/SF •No redundancy for pump recirculation with deteriorated pipe connections and strainer •Chemicals stored in office space •Chemical closet empty and lacks proper fire rating for storage enclosure R. JERRY FROST, PE, MS, MBA TROY A. MADLEM, PE, MLSE JACOB YODER, PE KEVIN Q. WALSH, PE, SE, PHD JACOB ALTHOUSE, PE RICHARD ESTES, PE MATT CHELBERG, PE, MS 201 Lincolnway W, Ste 200 Mishawaka, Indiana 46544 Phone: 574-344-5900 www.frosteng.net October 20, 2022 City of South Bend Board of Public Works 227 W. Jefferson Blvd., Ste. 1316 South Bend, Indiana 46601 RE: South Bend Potawatomi Pool Study Secondary Assessment of short-term repairs As requested, Frost Engineering & Consulting, in conjunction with TMP Architecture and Councilman Hunsaker, has performed a secondary assessment of the Potawatomi Pool complex to identify the feasibility, including ROM costs and schedule impacts, to bring the pool complex back into an operational state for a short-term duration while the City of South Bend works to complete a city-wide Aquatics Master Plan. This secondary assessment, presented as an addendum to our original Facility Assessment report of August 30, 2022, includes additional inspection findings of the concrete pool shells, identifies the minimum suggested repairs required to reopen the facility while targeting a remaining useful life of 5 years or less and re-assesses the Cost Summaries included in our original report based on the additional inspection findings. Should the City choose to proceed with such short-term repairs, it is important to note that ongoing maintenance and future repairs may be necessary as key portions of the existing pool mechanicals, piping and architectural elements will remain in service “as-is”. Additionally, the overall capacity and functionality of the facility will remain as the Bath House will receive only minor cosmetic repairs and surface updates. Key Findings of Additional Inspections On September 16th, 2022, Parks Department staff removed the failed pool liners in both the Dive and Lap pools at the facility to permit a thorough inspection of the existing underlying concrete pool shells. Additional site visits were performed by the Frost team on September 26 and October 5, 2022, during which the concrete pool shells were sounded to identify delaminated/spalled areas and areas of cracking, delaminating and spalling were documented. South Bend Potawatomi Pool Study Page 2 INTENTIONAL APPROACH | INNOVATIVE DESIGN | DRIVEN SOLUTIONS © Copyright 2005. All rights reserved. Findings of our visual and non-destructive inspection of the pool shells include: Summary of Diving Pool Inspection • In general, the diving pool shell was found to be in fair to satisfactory condition • No visible cracking of the concrete; existing bottom paint (multiple layers) has lost adhesion and is peeling away from bottom • Minor areas of delamination (primarily around embedded items in the shell) were noted • No signs of spalling were noted Diving Pool shell, looking west Diving pool base slab, multiple layers of paint w/ lost adhesion South Bend Potawatomi Pool Study Page 3 INTENTIONAL APPROACH | INNOVATIVE DESIGN | DRIVEN SOLUTIONS © Copyright 2005. All rights reserved. Diving pool shell well showing peeling paint & exposed concrete Summary of Lap Pool Inspection • In general, the lap pool shell was found to be in very poor condition overall, primarily based on the condition of the base slab • Widespread and extensive cracking of the concrete base slab was noted. o Cracks in the slab have extended up into the pool shell walls in approximately 7 locations o Cracking has continued to progress and interconnect, forming a spiderweb of cracks across nearly the entire bottom surface • Prior surface patches in the concrete base slab have failed with vertical separation/heaving noted at nearly all repairs. Existing concrete under failed surface patching was found to be heavily delaminated Lap Pool shell, looking east South Bend Potawatomi Pool Study Page 4 INTENTIONAL APPROACH | INNOVATIVE DESIGN | DRIVEN SOLUTIONS © Copyright 2005. All rights reserved. Lap pool, looking west “Typical” condition of prior patching: delaminated & spalling with vertical separation from base slab South Bend Potawatomi Pool Study Page 5 INTENTIONAL APPROACH | INNOVATIVE DESIGN | DRIVEN SOLUTIONS © Copyright 2005. All rights reserved. Prior patching with spalled patch removed; widespread delamination noted in existing concrete below prior patching Vertical heaving/separation of prior patching from existing base slab South Bend Potawatomi Pool Study Page 6 INTENTIONAL APPROACH | INNOVATIVE DESIGN | DRIVEN SOLUTIONS © Copyright 2005. All rights reserved. Field documentation of observed conditions on 9/26/22 South Bend Potawatomi Pool Study Page 7 INTENTIONAL APPROACH | INNOVATIVE DESIGN | DRIVEN SOLUTIONS © Copyright 2005. All rights reserved. Recommendations and feasibility: Short-term repair Diving Pool In general, the observed condition of the Diving Pool shell, including the walls and base slab, were as expected and therefore appear to be a viable candidate to undergo short-term repairs to allow re-opening of the Diving Pool on a temporary basis. Additionally, the diving pool remains a candidate for long-term repair using the Myrtha RenovAction system proposed in our original Facility Assessment. Lap Pool As noted above, the Lap Pool shell was found to be in poor condition with extensive deterioration noted throughout. As such the lap pool will require significant repairs to allow its re-opening on even a temporary basis. Based on our professional opinion, the base slab of the pool shell would require complete reconstruction to allow installation of a new pool liner and re-opening of the pool. As a more cost-effective measure, consideration can be given to a partial replacement of the base slab, in conjunction with localized patching of the remaining concrete, to create a revised pool profile (in cross-section) with a uniform depth of 3ft-6in. The Lap Pool is not a candidate for long-term repair with the Myrtha RenovAction system proposed in our original Facility Assessment without complete reconstruction of the base slab which has been incorporated into the revised Long-term repair costs that follow. Cross-section of modified pool Budgetary Costs & Schedule Given the additional findings on the condition of the lap pool shell, we’ve updated the Cost Summary for required repairs to address additional work on the lap pool related to the poor condition of the base slab in addition to completing the minimum selective repairs necessary to allow reopening of the pool. Short-term Repairs: Estimated cost of minimum repairs to reopen $2,000,000 Includes necessary repairs & mandatory safety upgrades necessary to re-open the pool with a targeted life span of 5 years or less. Budgeting for ongoing maintenance and future repairs should be considered Long-term Repairs: Total of Renovation and Enhancements (revised) $5,707,269 Includes the scope of work identified in the original Facility Assessment report in addition to the reconstruction of the lap pool base slab in its entirety South Bend Potawatomi Pool Study Page 8 INTENTIONAL APPROACH | INNOVATIVE DESIGN | DRIVEN SOLUTIONS © Copyright 2005. All rights reserved. In weighing the option of whether to proceed with short-term repairs to re-open the existing facility on a temporary basis, the Board should be aware that it is unlikely that such repairs can be accomplished prior to the start of the 2023 summer swimming season based on current project commitments of specialty, commercial pool contractors and ongoing pool mechanical system supply chain issues. Based on general contractor feedback, re-opening of the existing facility appears feasible for the 2024 swimming season whether the short-term or long-term repairs are undertaken. Similarly, a re-imagined, ground-up build of an entirely new Potawatomi Pool facility may be achievable for the 2024 swimming season should the City so chose. Conclusion In looking ahead, with the goal of making informed decisions, we suggest the City consider completing a Feasibility study as a follow-up to the Audit to best understand the needs of the community, research available seasonal and year-round aquatic recreation options that would best complement the adjacent Potawatomi Park and Zoo facilities and accurately forecast the functional, operational and financial impact of the pool facility/development. Through completion of key demographic studies, public meetings & comment periods and tours of multi-generation facilities, a final master plan that identifies the preferred facility type, key amenities, budgeting, staffing levels and expected revenues & expenses can be developed. If you have any questions, please feel free to contact me. Thank you. Sincerely, Troy A. Madlem, PE, MLSE President Submitted in cooperation with: David W. Larson, AIA Carl Nylander, PE R. JERRY FROST, PE, MS, MBA TROY A. MADLEM, PE, MLSE JACOB YODER, PE KEVIN Q. WALSH, PE, SE, PHD JACOB ALTHOUSE, PE RICHARD ESTES, PE MATT CHELBERG, PE, MS 201 Lincolnway W, Ste 200 Mishawaka, Indiana 46544 Phone: 574-344-5900 www.frosteng.net August 30, 2022 City of South Bend Board of Public Works 227 W. Jefferson Blvd., Ste. 1316 South Bend, Indiana 46601 RE: South Bend Potawatomi Pool Study Frost Engineering & Consulting, in conjunction with TMP Architecture and Councilman Hunsaker, are pleased to submit the attached study of the City of South Bend’s Potawatomi Community Pool in accordance with our Professional Services Agreement, as approved by the Board of Public Works on July 26, 2022. Constructed originally in 1955, the pool is currently closed because of multiple operational deficiencies that are outlined in this report. Our Team was commissioned by the City of South Bend to analyze the existing Potawatomi Pool, identify improvements necessary to make the pool complex operational again and provide an estimated cost of work. This report makes no recommendations about the future of the facility, rather, it lists items requiring repair and improvement as a tool for the decision-making process moving forward. In addition to numerous repairs and upgrades suggested for the aquatic systems, extensive renovation of the interior planning of the building is necessary to achieve appropriate functionality including barrier-free access, appropriate toilet fixture counts, improved user experience, and staff amenities in addition to maintenance and renovations of the exterior structure and surrounding pool deck surfaces. In considering the costs to repair existing deficiencies, further exploring options that would redefine and update the functionality and community appeal of the facility seems warranted given the extensive work being suggested. There are many exciting aquatic features that could be considered such as shallow entries, induced currents, lazy rivers, spray features, waterslides, etc. in addition to other community-focused elements that would allow use of the facility on a more year-round basis if desired. Our team welcomes the chance to help facilitate such a discussion and can show examples of such facilities and features at the City’s request. Thank you for your selection of our Team to assist the City’s efforts on this important local amenity. Sincerely, Troy A. Madlem, PE, MLSE President TABLE OF CONTENTS SOUTH BEND POTAWATOMI POOL STUDY Section 1 Architectural Overview Page 1 Section 2 Aquatics Assessment Page 5 Section 3 Cost Summaries Page 51 Section 4 Appendix Page 53 1 1TMP ARCHITECTURE ARCHITECTURAL OVERVIEW SOUTH BEND POTAWATOMI POOL STUDY BASE 1 BASE 4 BASE 2 BASE 5 BASE 3 BASE 6 See Councilman Hunsaker report for detailed analysis. 2TMP ARCHITECTURE ARCHITECTURAL OVERVIEW SOUTH BEND POTAWATOMI POOL STUDY MAIN 1 MAIN 6 MAIN 2 MAIN 7 MAIN 3 MAIN 8 MAIN 4 MAIN 9 MAIN 5 MAIN 10 New Welcome DeskLocker Room Expansion 1 25 4 6 7 10 9 83 3TMP ARCHITECTURE ARCHITECTURAL OVERVIEW SOUTH BEND POTAWATOMI POOL STUDY EXT 1 EXT 2 EXT 3 EXT 4 EXT 5 1 1 3 524 4TMP ARCHITECTURE ARCHITECTURAL OVERVIEW SOUTH BEND POTAWATOMI POOL STUDY SITE 1 SITE 2 SITE 3 SITE 4 SITE 5 SITE 6 See Councilman Hunsaker report for detailed analysis. 2 AQUATICS ASSESSMENT 5TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 Potawatomi Swimming Pool Assessment South Bend, IN AQUATICS ASSESSMENT 6TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 2 Potawatomi Pool Audit Table of Contents A. EXECUTIVE SUMMARY ........................................................................................................... 3 B. POOL INFORMATION** ............................................................................................................ 5 C. POOL ITEMS .............................................................................................................................. 6 1. Structure and Finish .......................................................................................................... 7 2. Main Drains .................................................................................................................... 11 3. Perimeter Overflow System ............................................................................................ 13 4. Inlets ................................................................................................................................ 15 5. Access & Anchors .......................................................................................................... 16 6. Markings & Signage ....................................................................................................... 18 7. Deck and Pool Safety Equipment ................................................................................... 20 D. POOL MECHANICAL ITEMS .................................................................................................. 25 1. Piping & Valves .............................................................................................................. 26 2. Filtration .......................................................................................................................... 30 3. Pumps .............................................................................................................................. 33 4. Chemical Treatment ........................................................................................................ 35 5. Chemical Controller ........................................................................................................ 38 6. Make-up Water & Heating ............................................................................................. 40 E. OPINION OF PROBABLE COST ............................................................................................ 42 APPENDIX A – NEW POOL STRUCTURES ................................................................................ 44 AQUATICS ASSESSMENT 7TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 3 Potawatomi Pool Audit A.EXECUTIVE SUMMARY The City of South Bend commissioned the team of Counsilman-Hunsaker (CH), TMP Architecture, and Frost Engineering (FE) to provide a comprehensive assessment of the Potawatomi pool facility. A site visit was conducted by Carl Nylander (CH), Dave Larson (TMP), Jennifer Madlem (FE), and Troy Madlem (FE) on June 23, 2022 along with representatives from the City. The purpose of this site visit was to evaluate the existing facility, pool conditions and systems in compliance with current building codes and regulations. This report is based on discussions with staff on site, the visual inspection during the site visit, the original pool drawings, the renovation drawings from 2001, and previous assessments from the City and outside consultants. Where information wasn’t able to be discerned during the site visit or documents, assumptions were made based on the date of construction and typical industry practices. The pools were originally constructed in 1955 with renovations to the bathhouse and the addition of the main waterslide taking place in 2001. The two main pools are combined mechanically on a common recirculation and chemical treatment system. The larger shallow water area is largely used for lap swimming and recreation. It is 82’-3” long and 50’-0” wide with water depths ranging between 3.5 feet and 5 feet deep. The fiberglass waterslide is approximately 21 feet tall and comes into the shallower end of the pool. There are no floor drains in this main pool area which likely leads to water quality issues, especially with the condition of the interior liner. The deep pool area is 40’- 0” long by 40’-0” wide and originally was designed to accommodate two 1-meter diving boards and a 3-meter “high dive”. The water depths range from 6 feet to 12 feet. The depth profile doesn’t meet current code requirements for either springboard elevation, though it’s assumed that a “grandfathered” exemption is provided by the local authorities given the date of the pool’s original construction. A single 1-meter diving board remains alongside two poly slides. The final pool is a shallow wading pool that is 35’-0” by 20’-0” in size with shallow water up to 1’-4” deep and a mushroom spray feature. Reported annual attendance was a little less than 10,000 people over the course of a summer season. Some modest repairs have taken place since the facility was originally constructed, most notably the 2001 renovation mentioned above that updated the bathhouse and added the main waterslide. Mechanically for the pool systems, the main pools are on their third filtration system that is at the end of its useful life. When the current filters were installed in the late 1990s, the recirculation pump was replaced, too. New chemical systems were installed in 1999 with controller replaced only a few years ago. The pool structure began to deteriorate about 20 years ago and in 2005 a Renosys interior liner was installed. Most pool liners have a life expectancy of 10 years before they need to replace. But due to the pool’s current condition, staff reported that no liner manufacturer will approve or warranty their product to be installed in the pools given their current condition. So staff has been replacing sections of the liner in-house, especially over the last 5 years, to keep the pool operational for the community. It was noted that some sections of the liner won’t last through a season, so repairs need to be made during the summer while the facility is in-use. The other main area of concern is the condition of the original cast iron piping that is buried below the pool deck. Cast iron piping was common for swimming pool construction prior to the 1980s; AQUATICS ASSESSMENT 8TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 4 Potawatomi Pool Audit however, it’s unsuitable for long-term use with chlorinated water. Since it’s a ferrous metal, the piping corrodes and fails and is likely the primary contributor to the daily water loss estimated to be more than 14,000 gallons when the pools are in operation. Additionally, two major pieces of federal legislation have been passed impacting swimming pool facilities since the facility was originally constructed that impact new pools and existing alike. The first was the passage of the Americans with Disabilities Act in 2010. The facility did appear to have one battery powered lift, but a second is required for the main pool’s compliance. Additionally, no approved means of access is provided at the wading pool. The second major regulation that was passed a few years earlier at the federal level was the Virginia Graeme Baker Pool and Spa Safety Act. This requires all suction outlets in commercial pools to have approved anti-entrapment covers. Approved anti-entrapment covers were observed in the pools; however, they were original to the law being passed and have since expired. And due to how the pool is piped, the gutter dropouts are technically suction outlets and would be subject to the anti-entrapment cover requirement, too. As a qualification, this assessment was completed when the pools were fully emptied. This inhibits the evaluation of equipment performance that can only be observed during operation. Counsilman- Hunsaker relied on the staff’s information and our internal experience evaluating similar commercial aquatic facilities to make educated assumptions. This report references the “administrative code” or “code” which is the State of Indiana’s Department of Health and the Environmental Public Health Divisions 410 IAC 6-2.1 and 675 IAC 20-2 for the rules governing public and semi-public swimming pools. As mentioned previously, other applicable federal codes and rulebooks referenced are the Americans with Disabilities Act (ADA), the Virginia Graeme Baker Pool and Spa Safety Act (VGB), and ASME/ANSI A112.19.81. The administrative code requirements must be satisfied if a major modification of the pools are undertaken or if an item or piece of equipment needs repair. The recommended repairs address all administrative code items identified in this report. AQUATICS ASSESSMENT 9TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 5 Potawatomi Pool Audit B. POOL INFORMATION** Deep Pool* Lap Pool* Wading Pool Length 40’-0” 82’-3” 35’-0” Width 40’-0” 50’-0” 20’-0” Surface Area 1,600 ft2 4,112.5 ft2 700 ft2 Perimeter 160’-0” 264’-6” 60’-0” Depth 6’-0” to 12’-0” 3’-6” to 5’-0” 6” to 1’-4” Volume 86,000 gallons 125,000 gallons 4,000 gallons Bather Load 163 bathers 514 bathers 87 bathers Turnover Rate 5.86 hours 5.86 hours 1 hour Design Flow Rate 600 GPM 600 GPM 67 GPM Filtration Method High Rate Sand High Rate Sand High Rate Sand Filtration Area 30.8 SF 30.8 SF 4.91 SF Filtration Rate 19.5 GPM/SF 19.5 GPM/SF 13.6 GPM/SF *The deep pool and lap pool are physically separated but on the same recirculation system. **All information approximated from field observations, record drawings, and reports provided by the Client. AQUATICS ASSESSMENT 10TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 6 Potawatomi Pool Audit C. POOL ITEMS 1. Structure and Finish 2. Main Drains 3. Perimeter Overflow System 4. Inlets 5. Access & Anchors 6. Markings & Signage 7. Deck & Pool Safety Equipment AQUATICS ASSESSMENT 11TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 7 Potawatomi Pool Audit CH Observations, Comments and Recommendations: 1.Structure and Finish Observations and Comments: a) The facility consists of two large primary pool areas that are on a commonrecirculation system. The lap pool is 82’-3” long x 50’-0” long based on the originaldrawings with water depths ranging from 3’-6” to 5’-0”. The deep pool was originally constructed with two 1-meter springboards and one 3-meter springboard with waterdepths ranging from 6’-0” to 12’-0” and a size of 40’-0” x 40’-0”. The depth profileat the deep pool has complex slopes from the four corners to the main drain trench and does not meet current code minimums for either 1-meter or 3-meter diving envelopes. It’s assumed that the health department has “grandfathered” the deep poolenvelope for use of the 1-meter board due to the date of the pool’s originalconstruction. It’s likely that the City incurs higher insurance premiums as a result. b)The wading pool is located within a separated space. It is 35’-0” x 20’-0” and has awater depth of 6” that slopes to a low point at 1’-4”. c)All three pool areas were originally designed as cast-in-place concrete tanks thatappear to have a rubber-based painted finish. Most of the substrate could not beobserved with the liner in place; however, there were sections where the liner could be peeled back to observe it delaminating from the concrete or portions of the concrete deteriorating. d)Staff noted significant daily water loss. The combined lap pool and deep pool reported to lose approximately 4” of water depth per day if the make-up water wasturned off. This results in a daily loss of nearly 14,250 gallons or 10 gallons perminute. No water loss was observed nor were tests completed since the pools wereempty during the assessment, and no water loss was noted at the wading pool specifically. But given that the wading pool is the same age with the same materialsand repairs since it was originally constructed, it’s assumed that similar levels of water is being continually lost proportionally from the wading pool. If the lap pool and deep pool were fully water-tight, then it would be expected to lose approximately 1,600 gallons per day due to evaporation and splash out. e) The liner segments are applied and patched by internal staff. Reportedly, sections need to be replaced in the middle of the summer season with some segments onlylasting 4 weeks. Staff has reached out to liner manufacturers and no one is willing torecommend or warranty a replacement liner installation. f)There did not appear to be a common circumstance for what is causing the linerfailures. Some areas where the liner or patches were delaminating appeared to becollecting debris and sediment which could be contributing to the adhesion issues.Management of heavy sediment is likely an issue in the lap pool area since there is no AQUATICS ASSESSMENT 12TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 8 Potawatomi Pool Audit active floor suction outlets in this part of the pool. The only way to clean the pool floor is using a pool vacuum which is likely challenging, if not impossible, in the current situation with the liner segments delaminating. In other areas where the liner has come off the pool wall, sheets of the old pool paint has delaminated, potentially being the reason for failing in those areas. g) Without the pools being filled, it is difficult to determine if some settling below the structure has resulted due to the extensive water loss. If void pockets have been created due to the substrate washing away, this can be detrimental to the pool operation and water chemistry/quality, and at worse catastrophic to the pool structures. Recommendations: a) When the pools are filled, it would be recommended to inspect the rim flow elevations of the water to determine if all areas of the pool lip are consistent. If it is determined that there may have been some settlement in the structure, it would be recommended to engage a firm to do a ground penetrating radar (GPR) scan. That can help determine if there are any void pockets that have been created with the water loss that could have washed away the substrate. Void pockets are often treated with high pressure grout injection to stabilize the pool and subgrade. b) Pool leaks can be identified using a colored dye test or sounding to help target areas of concern. And if buried piping is source of any leaks, then the piping system can be isolated via caps or balloons and pressurized. It’s recommended to always use water (hydraulic) pressure instead of pressurizing via air (pneumatic) means. It is assumed that all piping below the pool and deck is cast iron as indicated on the original drawings. Cast iron was common for pool construction prior to the 1970s and 80s; however, it is subject to failure over time due to it not being compatible with chlorinated water. Movement of the pool or changes in the subsurface could have damaged the pipes, too, as can improper winterization. It is recommended to plug the existing buried piping and placed under hydrostatic pressure to confirm integrity. If the pipe(s) don’t hold pressure due to corrosion or mineral build-up, a camera scope would be recommended to try and determine the point(s) of failure. Then the location(s) can be locally excavated and repaired. c) It’s recommended that a water meter be added to the potable water line serving as make-up to each pool. Readings on the totalizer should be documented infrequently (weekly or monthly). If higher water consumption is observed, it will be a clear indication that there is an unforeseen issue either with the pool structure or piping. d) Should the existing pool shells look to be repurposed, the most effective long-term solution will be to provide a new interior finish within the existing pool footprints that would be constructed of stainless steel pool walls with a PVC membrane within the AQUATICS ASSESSMENT 13TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 9 Potawatomi Pool Audit existing pool structures. A more in-depth description of this product and the installation process is included in Appendix A at the conclusion of this report. Image 1: Lap Pool & Deep Pool Image 2: Lap Pool Liner Wrinkling and Not Adhering Image 3: Lap Pool Liner Wrinkling and Not Adhering Image 4: Gutter Handhold and Fraying Fiberglass AQUATICS ASSESSMENT 14TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 10 Potawatomi Pool Audit Image 5: Pool Liner Delaminating from Painted Concrete Substrate Image 6: Liner Patch Image 7: Wading Pool Image 8: Jointed Stainless Steel Wall Panels Image 9: Debonding of Deep Pool Liner from Concrete Substrate Image 10: Vinyl Cement Adhesive Used for Pool Liner Repairs AQUATICS ASSESSMENT 15TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 11 Potawatomi Pool Audit Image 11: Spare Liner Sheets for Regular Pool Repairs 2. Main Drains Observations and Comments: a) The lap pool does not have any suction outlets on the bottom of the pool. Four (4) gravity flow-throughs connect the bottom of the lap area’s west wall to the east wall of the dive pool allowing for the pool areas to equalize with one another. The flow-though outlets lack proper covers. Originally, it’s believed that they had two or three steel bars covering the open ends of the pipes; however, several bars were missing and most were corroded. b) As noted in the previous section, management of heavy sediment is likely an issue in the lap pool area since there are no active floor suction outlets in this part of the pool. The only way to clean the pool floor is using a pool vacuum which is assumed to be a challenge. c) Since the waterslide feature was added in 2001 and not part of the pool’s original construction, no piping is buried and all is above the deck. The suction draw for the slide’s feature pump is in-board of the lap area wall and is covered with multiple Virginia Graeme Baker (VGB) anti-entrapment covers. VGB is a Federal standard that was enacted nearly 15 years ago. The plastic covers are all expired and are required by law to be replaced. d) The main drain outlets for the combined lap and deep pool are all located in a trench at the bottom of the deep end. VGB covers are provided, though similar to the slide, the drain covers are all expired. It appeared that twelve (12) 12”x12” Aquastar covers were provided over the original floor trench. Each outlet cover is rated by the AQUATICS ASSESSMENT 16TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 12 Potawatomi Pool Audit manufacturer for 323.1 GPM of flow at 1.5 ft/sec. Assuming that the pool’s recirculation rate is 600 GPM, the velocities are acceptable and compliant with code. e) None of the drain outlets in the wading pool had compliant VGB covers as required by Federal and State code. f) Each drain outlet should be provided with a hydrostatic relief valve. The purpose of hydrostats are to spring open and allow for ground water to enter into an empty pool through perforated piping when ground water levels are higher than the pool floor. If they are not in place or operational, empty pools risk the possibility of “floating” where hydrostatic pressures can exert an uplifting force to elevate the pool out of the ground. g) All main drains should also comply with ASME ANSI/APSP-16-2011 which requires a vertical separate between the top of the drain suction pipe to the underside of the drain cover of 1.5 times the suction pipe diameter. Recommendations: a) Federal law requires that all VGB drain covers be replaced on the intervals specified by the manufacturer. The Aquastar covers that were presumed to be installed following the passage of VGB into law 15 years ago, are only rated for five (5) years before they are required to be replaced. The attic stock covers observed in the wading pool’s mechanical area are also expired and should therefore not be installed as replacements. b) Based on limited information on the slide pump, it’s unclear what the designed flow rate is. Similar open flume body slides often require a water supply of around 800 GPM. With each drain cover being rated for 323.1 GPM, it’s possible that the flow rates at the covers are undersized. c) When the pool is drained and the covers removed, confirm there is proper separation between the drain suction lines and the underside of the VGB cover. d) Also, when the pool is fully drained, confirm that the hydrostatic relief valves are operational. e) Provide secure and safe outlet covers for the four (4) flow-through equalizer lines connecting the lap area and deep area. A PVC grate secured with stainless steel fasteners would be acceptable. AQUATICS ASSESSMENT 17TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 13 Potawatomi Pool Audit Image 12: Gravity Flow Through Outlet Connecting the Lap and Deep Pools Image 13: Suction Outlet for Waterslide Feature Image 14: Wading Pool Drain Outlets Image 15: Deep Pool Main Drain Outlets 3.Perimeter Overflow System Observations and Comments: AQUATICS ASSESSMENT 18TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 14 Potawatomi Pool Audit a) Of the debris that enters a pool either from swimmers or nature, approximately 75- 80% of it resides at the surface. It is for this reason that all health codes require particulate removal at a pool’s water surface. This can be done either with a series of skimmers with adjustable floating weirs spaced periodically around a pool, or with a continuous overflow gutter which should skim water around the full pool perimeter if the pool was constructed level and there has been no settlement over time. State code prohibits skimmers if a pool is wider than 30 feet. b) Within the gutter, the lap area has twenty-six (26) dropouts where the overflow water travels and returns to be recirculated through the filter and chemical treatment system before returning back to the pool through the wall inlet network. The deep pool has sixteen (16) dropouts which is proportional to the size of the pool in terms of volume and recirculation rate compared to the lap area. Assuming a recirculation rate of 600 GPM, each 2” dropout carries 14.3 GPM of water. c) The wading pool has a similar gutter as the lap/deep pool with two (2) dropouts, each carrying 33.5 GPM of water to its recirculation system assuming a recirculation rate of 67 GPM. d) Staff reported that the gutter is operated in a flooded condition. Typically, the pool water level in gutter pools is maintained at the top of the handhold so that particulate can be removed more effectively from the pool and not rebound back into the pool. Gutter pools require surge tanks that have a capacity of at least one gallon per square foot of the pool’s water surface area. This allows for displaced water from the body mass of swimmers to be captured in a separate tank and allow the pool to continue operating at the handhold or rim flow elevation for sanitary purposes whether one person is in the pool or several hundred. The gutter dropouts for all pools at Potawatomi are directly connected to the recirculation pump putting them under direct suction. While there shouldn’t be any risk of entrapment given the numerous outlets, any submerged suction outlet (main drains, vacuum port fittings, skimmer equalizers, or gutter returns that are under direct suction) require VGB anti-entrapment fittings per Federal code. Recommendations: a) Either a surge tank with minimum capacities of one gallon per square foot of water surface area is recommended for the pools, or anti-entrapment covers should be provided at the forty-four (44) dropout locations if they remain under direct suction. AQUATICS ASSESSMENT 19TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 15 Potawatomi Pool Audit Image 16: Perimeter Overflow Scum Gutter at the Lap Pool Image 17: Lap Pool Gutter Outlet 4. Inlets Observations and Comments: a) Filtered and treated water is introduced into the pool via wall returns. The returns in the lap and deep pool areas are roughly spaced at even intervals around the full pool perimeter. Sixteen (16) are provided in the lap area and eight (8) in the deep area. Based on the assumed recirculation rate and balancing between the two pool areas, approximately 21.7 GPM is provided at each lap area inlet and 29.9 GPM at each deep area inlet. With each fitting being supplied by a 2” pipe, velocities are 2.07 ft/sec and 2.86 ft/sec, respectively, and below the maximum code velocity of 10 ft/sec. b) Wall inlets can inhibit recirculated water in quiescent conditions to circulate treated water in the middle of the pool as velocities tend to “short cycle” to the perimeter gutter. Many codes do not allow them for pools as wide as the main lap/deep pool for this reason. Indiana requires floor inlets for any pool wider than 30 feet for better circulation and distribution of treated water. Recommendations: a) No action is recommended to the wall inlet system. AQUATICS ASSESSMENT 20TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 16 Potawatomi Pool Audit Image 18: Wading Pool Wall Returns Below the Gutter Trough Image 19: Deep Area Wall Inlets Below the Diving Board and Water Slides Image 20: Original Wall Return Fitting at the Lap Area 5. Access & Anchors Observations and Comments: a) Egress ladders with handrails were provided around both the lap pool and diving pool. The ladders were in storage since the facility wasn’t operational, but it appeared that there were sufficient number of anchors and ladders to exceed code minimum requirements which include either side of the pool and not more than 75 feet apart around each pool’s perimeter. Some discoloration was observed on some of the stainless steel. AQUATICS ASSESSMENT 21TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 17 Potawatomi Pool Audit b)The Americans with Disability Act (ADA) was passed into law for commercial poolsin 2010. Under the requirements of this law, even pools built prior to this date had to comply with the minimum accessibility requirements. For pools with perimeters lessthan 300 LF, only one means of access is required. This can be either a ramp entry ora lift. Only one (1) battery powered pool lift was observed in storage. c)For ADA compliance at a wading pool, a sloped entry is the most common means ofapproved access since the water depth is too shallow for a conventional lift. Unliketraditional pools, handrails are not required to comply with ADA at wading pool ramps. Recommendations: a)All stainless steel that is not fully submerged will exhibit signs of corrosion.Discoloration and corrosion are much less aggressive in an outdoor environment where any chloramines escape to the atmosphere. Spectra Clean or similar stainless steel cleaners for pool environments should be used to clean all stainless steel abovethe water level, such as ladders. b)A minimum of one means of approved ADA access is required at each pool. Thiswould mean a ramp entry within the wading pool and the purchase of a second lift foreither the deep pool or lap pool. Because the pool predates ADA enactment, aportable lift is acceptable. However, the lifts are required by law to remain at the side of each pool during all hours of operation. It cannot be kept in a storage room off thedeck and only available upon request. c)Any embeds within 5’-0” of the pool require bonding and grounding per NEC 680. It’s recommended that the pool bonding “grid” is tested for continuity. Image 21: Eyebolt Anchor for Lane Lines Image 22: ADA Lift Chair AQUATICS ASSESSMENT 22TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 18 Potawatomi Pool Audit Image 23: Battery-Powered Pool Lift Image 24: Egress Pool Ladders 6. Markings & Signage Observations and Comments: a) The depth markings and No Diving warning signs were provided around the perimeter of both the lap pool and deep pool. However, no vertical depth markings were provided on the back of the gutter curb or around the pools on the fence. No depth markings or warning signs were observed at the wading pool. Code requires horizontal depth markings on the deck and vertical depth markings on the pool walls at the same locations. Depths markings are necessary at any depth contour changes, vertical depth changes of 24”, and no more than 25 feet apart from one another around the pool’s perimeter. b) The posted maximum number of occupants was 213 for the lap pool, 83 people for the deep pool, and 36 for the wading pool. Since the deck area is more than twice the combined water surface area of the pools, a total of 764 people should be permissible. c) Some “No Entry” signs were observed, but there were not any “No Diving” warning signs. Code requires No Diving warning signs at areas where the water depth is less than five (5) feet and is recommended to be spaced at no more than 25 feet apart. Recommendations: a) Depth markings and warning signs should meet current code requirements, regardless of the original date of construction. Typically, depth markers and warning signs are not subject to grandfathered exemptive status. Vertical depth markings are recommended at all locations where horizontal depths are provided as code requires they be placed “on the vertical wall above the waterline as much as possible.” AQUATICS ASSESSMENT 23TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 19 Potawatomi Pool Audit b) “No Diving” warning signs are recommended around the pool at shallow water areas in similar size as the depth markers. This would apply to the entirety of the lap pool and wading pool c) Confirm if its acceptable with local officials to post and enforce a lower occupant capacity than what is calculated per code. d) To minimize staffing, it’s recommended to duplicate the minimum height requirement for the waterslide at the top of the tower. Then the lifeguard that dispatches the people going down the slide can confirm whether or not they are tall enough. Image 25: Posted Maximum Capacities Image 26: Waterslide Safety Signage Image 27: Pool Wall with No Depth Markings Image 28: Posted Wading Pool Capacity AQUATICS ASSESSMENT 24TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 20 Potawatomi Pool Audit 7. Deck and Pool Safety Equipment Observations and Comments: a) Since the site assessment took place during the offseason, little pool safety equipment was observed. b) The deck surrounding the pool was all concrete and had a significant number of cracks. Code requires that cracks in the pool deck with greater than 1/4” elevation difference to be remediated since they are a tripping hazard and can inhibit proper drainage. Only a handful of area drains were provided for deck drainage. Code requires at least one area drain per 400 SF of deck area. All deck area is required to slope between 1/8” and 1/2” per foot. c) The 21.5 foot tall open-flume body slide was installed in 2001 and was in good condition given its age. The fiberglass appeared well maintained. The slide terminus, where the fume stops upon entering the pool, projects from the wall and there isn’t a full shroud or end cap closing the space from the waterslide back to the pool wall. This is a requirement from some commercial slide manufacturers for safety purposes. d) No gate was provided at the bottom of the slide tower. Additionally, all openings at the facility enclosure are required per code to be self-closing and self-latching. e) A deck shower is between the deep pool and wading pool but reported to be not operable per staff. f) A robotic pool vacuum was observed in storage. As noted previously, the vacuum is likely not able to be used in the pool given the wrinkles and delaminating sections of the pool liner and patches. g) A single 1-meter diving board remains in the deep pool. Originally, two 1-meter boards and a single 3-meter board are indicated on the 1955 construction documents. Due to the deep pool’s depth profile and geometry, neither a 3-meter or 1-meter board are compliant with current code requirements. h) Wibit floatables were purchased by staff to offer some additional pool activities. It’s unclear which features are at the facility and how they are arranged and used, but it should be noted that the individual floatables have different depth and spacing requirements. Recommendations: a) Confirm that at least the minimum amount of safety equipment is provided and in good condition per code which include two (2) lifeguard stands for the lap pool and AQUATICS ASSESSMENT 25TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 21 Potawatomi Pool Audit one (1) for the deep pool, three (3) ring buoys, three (3) shepherd’s hooks with extension poles, and three (3) 24-unit first aid kits. b) Remediate cracks in the pool deck to comply with code, minimize trip hazards, and ensure adequate drainage. c) Should the deck be replaced, it should be sloped per current code requirements with at least one area drain per 400 SF of deck area. d) A gate is recommended at the bottom of the slide tower with a lock to discourage access during periods when the slide is closed. e) While the main waterslide is in good condition and should have many more years of life expectancy remaining, should the facility undergo a major renovation that would require the slide to be moved, it may prove difficult to repurpose it. In similar situations in the past, original slide manufacturers have cited issues with certification and liability. f) Perimeter fencing to be equipped with self-closing, positive self-latching closure mechanism at least forty-five (45) inches above the ground and provided with hardware for locking. Note that if the locking mechanisms are between 45-54 inches above the ground, there are several other code provisions that would be required for compliance. g) While the deck shower is reported to be inoperable, it is not required by code. However, all swimmers should be required to take a shower prior to entering the pool. Brief rinsing showers of at least 17 seconds have been proven to have a dramatic impact on the water quality and organic loading (sweat, dirt, skin cells, etc.) within a pool. h) The remaining 1-meter diving board should be “grandfathered” into acceptance by local officials given the original construction date of the pool. However, liability and the City’s insurance premiums are likely elevated based on non-compliance with current safety regulations. i) Based on which models and how the Wibit floatables are arranged, confirm they meet the manufacturer's minimum spacing and depth requirements. AQUATICS ASSESSMENT 26TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 22 Potawatomi Pool Audit Image 29: Waterslide Termination Image 30: Open Flume Body Slide Image 31: Waterslide Access Stair Missing Gate and Lock Image 32: Wading Pool Mushroom Spray Feature AQUATICS ASSESSMENT 27TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 23 Potawatomi Pool Audit Image 33: Pool Deck Image 34: Inoperable Shower and Barrier Fence for the Wading Pool Image 35: 1-Meter Diving Board Stand, Poly Slides, and Fixed Guard Station Image 36: Composite Diving Board Image 37: Wibit Inflatables Image 38: Robotic Pool Vacuum AQUATICS ASSESSMENT 28TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 24 Potawatomi Pool Audit Image 39: Cracks in the Concrete Pool Deck Image 40: Spot Drains for Deck Drainage AQUATICS ASSESSMENT 29TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 25 Potawatomi Pool Audit D. POOL MECHANICAL ITEMS 1. Piping & Valves 2. Filtration 3. Pumps 4. Chemical Treatment 5. Chemical Controller 6. Make-Up Water & Heating AQUATICS ASSESSMENT 30TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 26 Potawatomi Pool Audit CH Observations, Comments and Recommendations: 1. Piping & Valves Observations and Comments: a) The exposed piping in the pool mechanical room is a mix of cast iron, especially where it comes into the basement from underground, and PVC. It’s speculation on where the pools are losing water, but based on the facility’s original construction date and the amount of water being lost, the majority is almost certainly coming from compromises in the underground cast iron piping. All of the water loss can lead to significant issues if they wash away the subgrade or undermine either the pools or bathhouse footings. b) Much of the valve hardware and piping supports were corroded in the mechanical room. The valves were not manipulated to confirm range of operation. Any chemicals or chlorinated pool water allowed to off-gas within the mechanical areas will deteriorate equipment and any exposed, uncoated ferrous metals over time. c) A few poured concrete supports had cracked into multiple pieces. d) Both impact and digital flow meters are used for the pools. Their operating condition and accuracy was unable to be evaluated since the pools were not full and circulating at the time of the assessment. e) No flow meter was installed on the backwash piping discharging from filter system. f) The suction line from the deep pool main drains is 10” with 4” piping coming from the overflow troughs in the two main pools. With a recirculation rate of 586 GPM, the velocity in these pipes is 2.44 ft/sec and 15.1 ft/sec, respectively, assuming 100% of the return flow is through each. g) The filtered water supply piping leaves the pool mechanical area as two 6” Sch 80 PVC lines, each serving half of the inlets at the lap and dive pool. This results in an internal velocity of 3.25 ft/sec, well below the 10 ft/sec maximum allowed per code. h) It’s unclear what the suction pipe sizes are at the wading pool since the as-built drawings do not indicate the current shed where the wading pool equipment is located. At a recirculation rate of 67 GPM, any piping under suction should be 3”, minimum, to comply with code. For the filtered water return, a 2” pipe would be adequate at this flow rate. i) The original vacuum ports indicated on the drawings that were built into the pool walls were not evident and have likely been covered by the pool liner. AQUATICS ASSESSMENT 31TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 27 Potawatomi Pool Audit Recommendations: a) Digital flow meters with magmeters are recommended for the most accurate flow readings. They should be installed at least 10 pipe diameters downstream from the nearest fitting and 4 pipe diameters upstream from the next fitting. “K” factors might require adjustment based on the spacing to the nearest fittings, especially for the wading pool, which can result in turbulent flow and readings that are less accurate. b) Maximum pipe velocities per code are 6 feet per second for any suction piping which appears to be well exceeded for the gutter dropout piping. It’s recommended that all pool piping that remains as cast iron be replaced with Schedule 80 PVC and at velocities compliant with current regulations. c) Impact flow meters should be provided on the backwash piping for the filter discharge and on the pool drain down line. Impact flow meters should be spaced per manufacturer’s directions, typically 10 pipe diameters downstream from the nearest fitting and 4 pipe diameters upstream from the nearest fitting. d) All corroded valve hardware, hangers, and supports should be replaced with appropriate materials for the environment. Clevis hangers should be supported from the building structure, not from other piping systems. Image 41: Split Filtered Water Return Lines Serving the Lap Pool and Dive Pool Areas Image 42: Corroded Clevis Hanger and Threaded Rod AQUATICS ASSESSMENT 32TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 28 Potawatomi Pool Audit Image 43: Cast Iron Suction Piping Coming into the Pool Mechanical Room Image 44: Isolation Valves for Strainer Servicing Image 45: Piping Support for Above-Ground Waterslide Piping Image 46: Impact Flow Meter for Waterslide Pump Image 47: Broken Concrete Support Image 48: Suction Piping for Lap/Dive Pool AQUATICS ASSESSMENT 33TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 29 Potawatomi Pool Audit Image 49: Suction Piping for then Wading Pool Partially Disassembled Image 50: Digital Signet Flow Meter Display Image 51: Broken Concrete Piping Support Image 52: Filter Influent PVC Piping Image 53: Corroded Piping Supports AQUATICS ASSESSMENT 34TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 30 Potawatomi Pool Audit 2. Filtration Observations and Comments: a) The main lap / deep pool appears to be on its third filtration system since the facility was originally constructed in 1955. It appears that large cartridge filters were installed in 1976 followed by the current vertical sand filters around 1996. b) Vertical sand filtration is not common in current new pool design domestically. If a facility utilizes high-rate sand filtration, the tanks are nearly always horizontal in orientation which allows for more efficient installations. However, vertical sand filters have a greater sand bed depth and can offer superior filtration depending on the amount of gravel and location of the laterals. c) The filter appeared in fair condition given its age. The filter manufacturer, Eureka, is not one of the larger filter manufacturers in the aquatics industry today. The tanks are steel construction and often have an interior lining that deteriorates over time, especially over 25+ years of use. Once the lining is compromised, corrosion will ensue and often becomes visible on the exterior of the filter tank. d) When asked, staff was unsure when the last time the internal sand media was replaced in the filters. e) Each filter tank has 15.4 SF of filter area resulting in a total filter area of 30.8 SF. Based on the recirculation rate of 586 GPM, the filtration rate is 19.5 GPM/SF. While most sand filters are tested to a maximum filtration rate of 20 GPM/SF, most commercial filter manufacturers do not recommend them for filtration rates above 15 GPM/SF. f) Backwashing of the filters is done via linked valves to reverse the filter’s flow. Since there isn’t a VFD, it is assumed that the flow rate remains approximately 293 GPM through each filter tank. This is the same flow rate as is regularly recirculated back to the pool. This will result in a similar backwash rate to the filtration rate, 19 GPM/SF. Fluidization of the media bed is important for a thorough backwashing. Recommended bed expansions are typically obtained at backwash rates between 18-20 GPM/SF. g) Each sand filter is provided with a small tap in the top of the tank to bleed any trapped air. This should be done manually to get air out of the system if the purge valve isn’t automated. Recommendations: a) Given that the vertical sand filters are more than 25 years old, it’s unknown when the sand was last replaced or the interior lining or laterals were inspected, and has been AQUATICS ASSESSMENT 35TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 31 Potawatomi Pool Audit operating above the maximum filtration rate commonly accepted in the industry for this type of filtration, it’s recommended that the existing filters be replaced. High rate sand filters are historically replaced every 25-30 years. Fiberglass filters are recommended for replacement instead of lined steel tanks. Basement access may be a challenge for new equipment installation and existing equipment removal due to the narrow stairway on site. b) The installation of a VFD on the recirculation pump may be able to program for a slightly higher flow rate for backwashing purposes to improve on the media bed fluidization, should a comparable sand filter be installed at a lower filtration rate. c) Provide an impact flow meter on the backwash line with appropriate spacing from fittings and valves per manufacturer’s installation recommendations. Image 54: Drain Valve and Pit to Waste Image 55: Discharge Pit, Sump Pumps, and Backflow Preventer AQUATICS ASSESSMENT 36TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 32 Potawatomi Pool Audit Image 56: Wading Pool Sand Filter Image 57: Lap/Dive Pool Sand Filters Image 58: Filter Air Relief Image 59: Filter Connection and Gauge Panel Image 61: Linked Hardware for Valve Manipulation & Backwashing AQUATICS ASSESSMENT 37TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 33 Potawatomi Pool Audit 3. Pumps Observations and Comments: a) One vertical in-line, split coupled pump is installed in the basement mechanical room for recirculating the pool water. It’s advantageous to have the pump below the water level operationally. And since the mechanical equipment is in a lower level, the vertical in-line pump is a good choice since it’s compact and takes up the least amount of space. The specifications on the pump (flow rate, head, motor size) were not legible from the name plate. The pump was reported to have been installed over 25 years ago with the filtration system. It’s believed to have a recirculation rate of 600 GPM. It’s likely that the motor is 20-30 hp. b) At 25+ years of operation, the main pool’s recirculation pump has nearly doubled the typical life expectancy of pumps installed in similar applications. Even if the impeller and pump internals were installed with robust coatings to protect it from the chlorinated water, the routine winterization and processing the pool detritus and corrosion from the cast iron piping has likely taken its toll on the pump internals. c) The pump strainer was steel and the lid exhibited almost complete corrosion. Presumably, it is difficult during normal operation to remove the lid and service the internal basket. d) A conventional motor starter was provided for the main recirculation pump. It was reported that the motor starts hard and could be a reason for the concrete supports splitting. e) The recirculating and feature pumps for the wading pool were both self-priming with little information available. Generally speaking, self-priming pumps are not as robust as the flooded suction type that is used for the main pool. No pump gauges were observed and some of the piping was disassembled. f) The slide pump is also self-priming and is provided with a 15 hp motor. It appeared in fair condition but there were signs on the pump’s exterior of corrosion which is a condition often stemming from the inside. Recommendations: a) It is recommended that a back-up pump be provided for pool. While the main pump is assumed to have been well-maintained given its time in service, pumps like most equipment, are experiencing several month’s lead time with current supply chain delays. Should any pump fail, the pool will need to be shut down until a replacement can be purchased and installed and would likely jeopardize the remainder of the summer season. The failure of the wading pool’s feature pump wouldn’t be as catastrophic. AQUATICS ASSESSMENT 38TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 34 Potawatomi Pool Audit b) Operable vacuum/compound gauge should be provided on the suction side of all pumps and a proper pressure gauge on each pump’s discharge. These gauges should be located as close to the pump itself for the most accurate readings. c) The pump curve for all pumps is recommended to be laminated and wall-mounted for reference within the pool mechanical room. If flow meters fail in the future, pump performance and operational conditions can still be determined by referencing the curves. d) When any pumps require replacement, it is recommended to be provided with a fusion bonded epoxy coating, similar to Scotchkote 134, to protect against the chlorinated water. e) The hair and lint strainers are recommended to be replaced for the main pump and the slide pump. New strainers are recommended to be fiberglass to maximize longevity, instead of steel, and be provided with a spare basket so the dirty ones can be cleaned while the pool is still in operation. f) When the motor starters require replacement, a variable frequency drive is recommended. VFDs typically pay for themselves after approximately 2 years of service from the energy savings on year-round pools. Swimming pool recirculation systems have to be designed for fully-loaded filters which only happen about 5% of the time. During the other 95% of the time, the pumps operate at a less efficient point on the pump curve which is why VFDs are valuable for these installations. Recirculation pump VFDs are typically controlled via flow cells downstream of the recirculation pumps and filters. VFDs can also help with the hard starts that are currently experienced with the main pool pump. g) All recirculation components should be bonded and grounded per National Electric Code (NEC) 680. This includes pool shell reinforcement, deck embeds within 5’-0” of the pool, at least 3’-0” of deck reinforcement around the pool, all spray features, pumps, filters, heaters, chemical feed pumps, and controllers. AQUATICS ASSESSMENT 39TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 35 Potawatomi Pool Audit Image 63: Slide Pump Corrosion & Missing Gauge Image 64: Exterior Corrosion at Waterslide Pump Image 65: Recirculation and Feature Pump for the Wading Pool Image 66: Vertical In-Line Split Coupled Pump for the Lap/Dive Pool Recirculation 4. Chemical Treatment Observations and Comments: a) Calcium hypochlorite (solid chlorine) is the primary sanitizer for the pools. The Pulsar IV erosion feeder is located within the pool office above the mechanical space. It appeared to be in good condition despite being over 20 years old. The chemical piping is through a large sleeve in the office floor to the recirculation piping in the basement. b) Muriatic acid is used for pH control of the pool water. 15 gallon carboys are within plastic spill platforms and not located in dedicated chemical closets. AQUATICS ASSESSMENT 40TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 36 Potawatomi Pool Audit c) NFPA chemical hazard signage and material safety information was not observed where the primary chemicals were used and stored for the pools. An MSDS booklet was seen in the pool office. d) An open air closet appeared to be used off the pool deck for chlorine storage. Based on the room’s construction, the amount of chemicals that can be stored within this encloser is minimal. For most building codes, 200 lbs of calcium hypochlorite can be stored if the room has an H-2 rating and is sprinklered. Recommendations: a) The pool chemicals are recommended to be stored in dedicated chemical closets to be exhausted independently to the exterior, typically at rates around 15-20 air changes per hour, depending on specific code requirements. They should be under a negative pressure relative to adjacent spaces and enclosed with a proper fire rating. b) NFPA chemical hazard signage was not provided for the chemicals stored on site and material safety data information was not observed. These should be located on the chemical room doors per code. And each room should be provided with the relevant MSDS information in the event of a spill or accident. c) Erosion feeders and the acid carboys should be kept fully sealed to limit any off-gassing. d) An acid scrubber is recommended to be installed on the top of the carboy. Since acid is extremely corrosive if allowed to off-gas the scrubber helps to limit these gasses that escape to the atmosphere. e) At the point of injection for the chemicals into the recirculation piping, it’s recommended that they’re installed with threaded pipe saddles which will limit the chemical leaks. f) The amount of chemical stored on site should not exceed the fire rating for which the room was designed. For calcium hypochlorite, typically product that is in the hopper does not count towards storage quantities. But under H-2 occupancy, most jurisdictions don’t allow for more than 200 lbs to be stored in the same space. g) Poly tubing can become brittle and is subject to leaks and failure. It’s recommended to plumb the chemical injections with a short run of poly tubing off the feed pump which then can connect to a Sch 80 PVC pipe to route the supply into the main return line. AQUATICS ASSESSMENT 41TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 37 Potawatomi Pool Audit Image 67: Muriatic Acid Carboy and Spill Platform Image 68: Pool Office and Main Pool Chlorinator Image 69: Storage Hopper of the Main Pool’s Calcium Hypochlorite Feeder Image 70: Sleeve for Chlorine Feed Piping to the Basement AQUATICS ASSESSMENT 42TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 38 Potawatomi Pool Audit Image 71: Chlorine Storage Closet Image 72: Interior of Chlorine Storage Closet 5. Chemical Controller Observations and Comments: a) A BECSys 3 water chemistry controller is installed for both the main lap/deep pool and the wading pool. They are newer controllers with limited functionality as the model is one of the basic BECS controllers. It appears that it is only used for chlorine and pH management. b) Since the pools were not in operation at the time of the facility assessment, the performance of the controllers were not observed. c) No remote access appeared to be provided for the controller. AQUATICS ASSESSMENT 43TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 39 Potawatomi Pool Audit Recommendations: a)It is strongly recommended that regular cleaning protocols are maintained for thecontroller’s probes per manufacturer’s recommendations. Once the pool is inoperation, manual water chemistry readings should be done at the sample cell to confirm the controller’s readings and calibrate if needed. A photometric test kit, such as Palintest 6, provides the more accurate readings compared to a standard Taylor testkit, and is recommended for calibration purposes. b)Confirm that the pool recirculation systems are interlocked with that recirculationpumps so that if there is no power to the recirculation pump, there is no power to thatpool’s other recirculation components. c)If there is a need for remote alert to maintenance staff when chemistry parameters areout-of-range or in alarm, a wireless module can likely interface with the controller toprovide instant notifications via text or email. Image 73: Wading Pool Water Chemistry Controller Image 74: Lap/Deep Pool Water Chemistry Controller AQUATICS ASSESSMENT 44TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 40 Potawatomi Pool Audit 6. Make-up Water & Heating Observations and Comments: a) The water make-up appears to be controlled manually for the pools. For the main pool, the water is fed into an open tank in the mechanical room basement. Due to the amount of water lost each day (approximately 14,000 gallons), the make-up supply will need to run for a considerable amount of time each morning. b) As noted previously in the report, water is continually added until the gutter trough is flooded. Since the gutter dropouts are under direct suction, if the water level is allowed to drop below the handhold, air could get into the recirculation system and cause operational problems with the equipment systems. c) There is no heat for the swimming pools. The gas boilers in the pool mechanical room serve the showers and bathhouse hot water needs. However, the heaters are not operational. Recommendations: a) An automated water level controller should be installed for both pools, potentially with a low level sensor add-on feature to fill the pool more quickly should the water levels drop close to the gutter handhold so air doesn’t enter the recirculation system and cause operational issues for the equipment. b) Replace the boilers to provide heat to the bathhouse. As noted previously, it’s important for patrons to take a brief rinsing shower before entering the pool. If the water isn’t heated, then it will discourage this best practice. c) A dedicated water meter is recommended to be provided for each pool system so that regular water consumption can be monitored to more quickly alert staff if there is a future water loss due to a pipe break below grade or a compromise in the pool structures. AQUATICS ASSESSMENT 45TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 41 Potawatomi Pool Audit Image 75: Make-Up Water Supply for the Lap / Deep Pool Image 76: Make-Up Fill Tank and Float Image 77: Gas Boilers AQUATICS ASSESSMENT 46TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 42 Potawatomi Pool Audit E.OPINION OF PROBABLE COST The following opinion of probable cost addresses the items identified in this report needing repair, replacement or renovation. It is recommended that, when prudent, the renovation tasks should be bundled to be more cost effective. This efficiency may result in an overall savings in the project cost. Please note that several of the items may either be dependent on another item and some may be more or less intensive based on testing results. Additionally, some line items render other options not applicable. Table 1: Opinion of Probable Repair & Renovation Costs Item Unit Unit Cost Quantity Total Cost Perform a dye test to determine leak sources within the pool shells Lump Sum 3,500$ 1 3,500$ Perform a ground penetrating radar scan of the pool floors to determine condition of subgrade Lump Sum 4,500$ 1 4,500$ Provide new VGB drain covers Each 750$ 18 13,500$ Allowance for vertical and horizontal depth markings and No Diving warning signage Lump Sum 4,000$ 1 4,000$ Provide PVC covers for the flow-through openings between the lap pool and deep pool Each 150$ 4 600$ Allowance for replacing all buried cast iron piping between the pools and mechanical areas with Schedule 80 PVC Lump Sum 450,000$ 1 450,000$ Provide a second battery-powered portable pool lift Lump Sum 6,500$ 1 6,500$ Provide a concrete surge tank to allow the gutters to drain via gravity, manage the pool's water level, and allow for code required surge Lump Sum 27,500$ 1 27,500$ Provide a digital flow meter for each recirculation system Each 1,200$ 1 1,200$ Provide impact flow meter on the backwash and drain line piping Each 250$ 2 500$ Allowance for replacing corroded pipe hangers and supports as well as mechanical room piping repairs Lump Sum 7,500$ 1 7,500$ Provide a compound and pressure gauges for the new pool and spa pumps Each 115$ 10 1,150$ Provide new recirculation pumps for the main pool along with new hair and lint strainers Each 20,000$ 2 40,000$ Provide new 15 hp pump for the waterslide including new strainer Each 13,500$ 1 13,500$ Provide new self priming recirculation and feature pumps for the wading pool Each 4,000$ 2 8,000$ Provide automated water level controller and solenoids for potable water make-up supply Each 6,500$ 2 13,000$ Provide new high rate sand filtration system for the lap/deep pool with manual backwash Lump Sum 78,000$ 1 78,000$ Provide new sand within the wading pool filter Lump Sum 1,000$ 1 1,000$ AQUATICS ASSESSMENT 47TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 43 Potawatomi Pool Audit Table 1: Opinion of Probable Repair & Renovation Costs (cont.) Notes: 1) Repair costs do not account for draining, refilling, heating, or chemical treatment costs. 2) Refer to other disciplines for deck remediation and deck drainage, ejection pit and equipment, chemical storage areas, bathhouse modifications, perimeter facility enclosure, and domestic water heaters. 3) The engineer has no control over the cost of labor, materials, equipment, or over the contractor’s methods of determining prices or over competitive bidding or market conditions. Opinions of probable costs provided herein are based on the information known to the engineer at this time and represent only the engineer’s judgment as a design professional familiar with the construction industry. The engineer cannot and does not guarantee that proposals, bids, or actual construction costs will not vary from its opinions of probable costs. Item Unit Unit Cost Quantity Total Cost Provide variable frequency drives for the main pool recirculation pumps Each 11,000$ 1 11,000$ Provide variable frequency drives for the wading pool recirculation pump Each 5,750$ 1 5,750$ Provide acid scrubbers for the in-use carboys Each 1,000$ 2 2,000$ Provide NFPA signage and MSDS information for chemicals stored at the site.Lump Sum 135$ 1 135$ Provide a Palintest photometric test kit Each 1,000$ 1 1,000$ New wading pool concrete structure with ramp entry (structure and finishes only, not including mechanical systems) Square Foot 215$ 700 150,500$ Myrtha RenovAction for the lap pool Lump Sum 690,000$ 1 690,000$ Myrtha RenovAction for the dive pool Lump Sum 410,000$ 1 410,000$ AQUATICS ASSESSMENT 48TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 44 Potawatomi Pool Audit APPENDIX A – NEW POOL STRUCTURES Given the persistent challenges with the existing pool structure, finishes, and annual repairs, an option that may warrant consideration by the City of South Bend is the construction of new pool structures within the existing pool shells. Should the wading pool undergo a major renovation, it will be more cost effective to demo and provide a new concrete structure due to its size and depth. A “RenovAction” solution would give new life to the Potawatomi lap and dive pools for decades to come. This would be a proprietary system from Myrtha Pools. It has been implemented effectively on many similar existing pool shells that exhibit many of the same operational and performance issues that face problematic structural issues over decades of use. A RenovAction consists of thin rails that are mechanically secured to the existing structure for the installation of modular stainless steel panels and finished with a fiberglass reinforced composite membrane. Since the pool is not used for competitions and exact course lengths are not critical, it will likely be most cost effective to construct the RenovAction system within the existing pool tanks reducing the overall pool area minimally. The existing perimeter overflow gutters would be removed and new wall panel systems with perimeter overflow gutters would be provided. With the existing gutter profile, it should be relatively easy to accommodate a custom RenovAction rim-flow gutter on top of the existing trench, potentially with a little concrete demo to enlarge the space. With this approach, the water level would raise by 5-6 inches; just enough to pour a new floor and thus easily accommodate new floor inlets throughout the pools and new main drains. A marked-up cross section of the existing wall is included at the end of this appendix. This option would come with a 25-year warranty on the structure and 10-year warranty for waterproofing integrity. The panels and materials will come from Italy, so there is a measurable lead time that needs to be built into the timeline for approvals, fabrication, and shipment. To get a feeling for the procurement time needed, on a recent project for a 50 meter pool RenovAction, Myrtha requested 120 days from time of initial deposit until the materials were on site. Once on site, the actual installation could start and finish easily within one off-season. As mentioned, the RenovAction system would receive a new gutter around each pool’s full perimeter, as well new main drain sumps and return fittings. Below are before and after example images from some other RenovAction installations in the U.S. Before and After Images #1: Rochester Recreation Center – Rochester, MN AQUATICS ASSESSMENT 49TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 45 Potawatomi Pool Audit Before and After Images #2: Simpson Park – Lakeland, FL Before and After Images #3: Miami Dade College – Miami, FL Before and After Images #4: Memorial Pool – Pasco, WA The renovated pool would be provided with an “Evolution” flooring membrane finish. The total opinion of cost for the Myrtha RenovAction system is $1,100,000 and included as line items within the previous section of this report. Approximately 37% of this cost is for the deep pool and the remainder for the lap pool. AQUATICS ASSESSMENT 50TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY June 23, 2022 46 Potawatomi Pool Audit Other options are available, such as the Myrtha “Skin” which provides a complete steel pool solution as the product consists of the same Myrtha steel/PVC technology, but with a thickness of 0.5mm (25 Gauge) and is supplied in rolls. The installation follows a similar procedure as the Myrtha Evolution membrane, with expansion joints to allow for any future potential movement of the floor. Myrtha Skin: Stainless Steel Rolls & Installation Potential Myrtha Renovation Installation within the Existing Lap Pool 3 COST SUMMARIES 51TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY Potawatami Pool July 28, 2022WorkDescription Architectural, Mechanical and Electrical Work 1. Replace Roof and Deck Remove and replace 5728 sf of 2" wood deck and roofing.$250,600 2. Renovate entire interior of Bath House. Provide interior lobby, all gender neutral style changing rooms, public locker area and ADA accessible toilets and showers. Provide new mechanical and electrical systems including HVAC and new lighting. 3,200 sf of renovation $1,535,000 3. Addition to Bath House Add approximately 1000 sf to accommodate ADA needs and add code required minimum plumbing fixture counts per gender: 6 water closets, 3 sinks, and 5 showers $562,500 4. Repair Rotting Facia Remove 2x facia constructiona and replace, including new alumnium cladding $35,000 5. Replace concrete pool deck Remove and replace entire concrete pool deck surfaces. 17,500 sf of 4" concrete slabs $343,750 6. Replace exterior doors and frames with FRP Remove existing doors and frames. Install FRP doors and aluminum frames including new hardware - 11 leafs $50,000 Architectural Subtotal $2,776,850 Aquatic Components 1.Perform a dye test to determine leak sources within the pool shells $4,375 2.Perform a ground penetrating radar scan of pool floors to determine condition of subgrade $5,625 3.Provide new VGB drain covers (x18 units)$16,875 4.Allowance for vertical and horizontal depth markings and No Diving warning signage $5,000 5.Provide PVC covers for the flow-through openings between the lap pool & deep pool (x4 units)$750 6.Allowance for replacing all buried cast iron piping between the pools and mechanical areas with Schedule 80 PVC $562,500 7.Provide a second battery-powered portable pool lift $8,125 8.Provide a concrete surge tank to allow the gutters to drain via gravity, manage the pool's water level, and allow for code required surge $34,375 9.Provide a digital flow meter for each recirculation system $1,500 10.Provide impact flow meter on the backwash and drain line piping (x2 units)$625 mated Project Cost COST SUMMARIES 52TMP ARCHITECTURE SOUTH BEND POTAWATOMI POOL STUDY 11.Allowance for replacing corroded pipe hangers & supports as well as mechanical room piping repairs $9,375 12.Provide a compound and pressure gauges for the new pool and spa pumps (x10 units)$1,438 13.Provide new recirculation pumps for the main pool with new hair & lint strainers (x2 units)$50,000 14.Provide new 15 hp pump for the waterslide including new strainer $16,875 15.Provide new self priming recirculation and feature pumps for the wading pool (x2 units)$10,000 16.Provide automated water level controller & solenoids for potable water make-up supply (x2 units)$16,250 17.Provide new high rate sand filtration system for the lap/deep pool with manual backwash $97,500 18.Provide new sand within the wading pool filter $1,250 19.Provide variable frequency drives for the main pool recirculation pumps $13,750 20.Provide variable frequency drives for the wading pool recirculation pump $7,188 21.Provide acid scrubbers for the in-use carboys (x2 units)$2,500 22.Provide NFPA signage and MSDS information for chemicals stored at the site.$169 23.Provide a Palintest photometric test kit $1,250 24.New wading pool concrete structure with ramp entry (structure and finishes only, not including mechanical systems)$188,125 25.Myrtha RenovAction for the lap pool $862,500 26.Myrtha RenovAction for the dive pool $512,500 Pool Subtotal $2,430,419 Total for Renovation Work $5,207,269 Potential Enhancements to Existing Facility Provide exterior lighting for pools (night time use) Install New exterior light poles and LED lighting $250,000 Total of Renovation and Enhancements $5,457,269 4 APPENDIX SOUTH BEND POTAWATOMI POOL STUDY APPENDIX SOUTH BEND POTAWATOMI POOL STUDY APPENDIX SOUTH BEND POTAWATOMI POOL STUDY APPENDIX SOUTH BEND POTAWATOMI POOL STUDY APPENDIX SOUTH BEND POTAWATOMI POOL STUDY