The URL can be used to link to this page

Home My WebLink AboutAGENDApacket__05-11-21_0955_225 NOTICE OF MEETING SPECIAL WORK SESSION FOUNTAIN HILLS TOWN COUNCIL Mayor Ginny Dickey Vice Mayor Mike Spelich Councilmember Gerry Friedel Councilmember Sharron Grzybowski Councilmember Alan Magazine Councilmember Peggy McMahon Councilmember Mike Scharnow TIME:5:30 P.M. – SPECIAL WORK SESSION WHEN:TUESDAY, MAY 11, 2021 WHERE:FOUNTAIN HILLS COUNCIL CHAMBERS 16705 E. AVENUE OF THE FOUNTAINS, FOUNTAIN HILLS, AZ Councilmembers of the Town of Fountain Hills will attend either in person or by telephone conference call; a quorum of the Town’s various Commission, Committee or Board members may be in attendance at the Council meeting. Notice is hereby given that pursuant to A.R.S. §1-602.A.9, subject to certain specified statutory exceptions, parents have a right to consent before the State or any of its political subdivisions make a video or audio recording of a minor child. Meetings of the Town Council are audio and/or video recorded and, as a result, proceedings in which children are present may be subject to such recording. Parents, in order to exercise their rights may either file written consent with the Town Clerk to such recording, or take personal action to ensure that their child or children are not present when a recording may be made. If a child is present at the time a recording is made, the Town will assume that the rights afforded parents pursuant to A.R.S. §1-602.A.9 have been waived. REQUEST TO COMMENT The public is welcome to attend Council work sessions; however, pursuant to Section 3.7 of the Town Council Rules of Procedure public comment is not taken. TO COMMENT ON AN AGENDA ITEM IN WRITING ONLY, please complete a Request to Comment card, indicating it is a written comment, and check the box on whether you are FOR or AGAINST and agenda item, and hand it to the Town Clerk prior to discussion, if possible. TO COMMENT IN WRITING ONLINE: Please feel free to provide your comments by visiting https://www.fh.az.gov/publiccomment and SUBMIT a Public Comment Card by 3:00 PM on the day of the meeting. These comments will be shared with the Town Council. AGENDA AGENDA NOTICE OF OPTION TO RECESS INTO EXECUTIVE SESSION Pursuant to A.R.S. §38-431.02, notice is hereby given to the members of the Town Council, and to the general public, that at this meeting, the Town Council may vote to go into executive session, which will not be open to the public, for legal advice and discussion with the Town's attorneys for legal advice on any item listed on the following agenda, pursuant to A.R.S. §38-431.03(A)(3). 1.CALL TO ORDER – Mayor Ginny Dickey 2.ROLL CALL – Mayor Dickey 3.REVIEW and DISCUSS the findings and recommendations from Black and Veatch's evaluation of the Fountain, Lake Liner, and other related systems at Fountain Park. 4.ADJOURNMENT CERTIFICATE OF POSTING OF NOTICE The undersigned hereby certifies that a copy of the foregoing notice was duly posted in accordance with the statement filed by the Town Council with the Town Clerk. Dated this ______ day of ____________________, 2021. _____________________________________________ Elizabeth A. Klein, MMC, Town Clerk The Town of Fountain Hills endeavors to make all public meetings accessible to persons with disabilities. Please call 480-816-5199 (voice) or 1-800-367-8939 (TDD) 48 hours prior to the meeting to request a reasonable accommodation to participate in the meeting or to obtain agenda information in large print format. Supporting documentation and staff reports furnished the Council with this agenda are available for review in the Clerk's Office. Town Council Special Work Session of May 11, 2021 2 of 2 ITEM 3. TOWN OF FOUNTAIN HILLS STAFF REPORT Meeting Date: 05/11/2021 Meeting Type: Town Council Special Work Session Agenda Type: Public Appearances/Presentations Submitting Department: Community Services Prepared by: Patti Lopuszanski, Executive Assistant Staff Contact Information: Rachael Goodwin, Community Services Director Discussion/Direction (Agenda Language): REVIEW and DISCUSS the findings and recommendations from Black and Veatch's evaluation of the Fountain, Lake Liner, and other related systems at Fountain Park. Staff Summary (Background): In April 2020 the Town Council approved a contract with Black and Veatch Engineering to conduct a comprehensive analysis of the fountain, lake, and related systems at Fountain Park. With the fountain reaching fifty years of age, this assessment was intended to determine the current condition of the facilities and potential repair and replacement needs for our community icon. Black and Veatch began its analysis in May 2020 and has performed multiple inspections and tests to benchmark the current condition of the fountain, lake liner, and supporting components. Divers took numerous sediment depth measurements and conducted visual inspections throughout the perimeter of the lake to determine the liner's current condition. The team also conducted an evaporation analysis of the lake over a 10-day period to test for evidence of leaks. Electrical component testing was also conducted, including an arc flash and short circuit analysis, as well as evaluating the feasibility of a variable frequency drive to control the pump system. Mechanical testing, including pressure testing, video scoping, and diver evaluations of submerged equipment were also conducted during this time The team also evaluated the current irrigation system with consideration of installing a double loop system and the possibility of a direct feed water source from the Fountain Hills Sanitary District, in order to improve irrigation water quality as a means to improve plant and turf health. The findings from the initial assessment were presented to the Town Council in October 2020 with a brief synopsis highlighted below. A visual inspection of the lake liner from underwater divers was conducted and identified no evidence of leaking, tearing or other compromises in the integrity of the lake liner. An additional evaporation test further confirms this finding. Pumps, valves and other mechanical equipment are showing wear and will require some maintenance and repair efforts. Irrigation output (reducing the watering window within park) will require additional flow capacity and an increase in mainline and pump sizing. Electrical systems including transformers, switchgear and controllers exceed manufactures life expectancy and do not pose immediate concern of failure Converting to a Variable Frequency Drive (VFD) for fountain pump operation is not recommended as the return on investment from energy savings is about 15-20 years which is the useful life of the equipment. Due to a potential safety issue and possible premature failure of the remaining fountain check valves, the town took the following steps before completion of the fountain study: Ordered properly engineered fountain check valves to prevent fountain failure and with a longer life cycle Installed arc flash labels on high voltage electrical cabinets to prevent serious injuries to employees and contractors An important part of the assessment includes identifying the logistics for the eventual removal and replacement of the laker liner, including options for water drainage, sediment removal, wildlife remediation, environmental impacts, and other related tasks. Estimated equipment costs and workflow options will be presented to the Town Council that will assist in formulating strategies to undertake the project. Attachments Black and Veatch Form Review Inbox Reviewed By Date Community Services Director Rachael Goodwin 04/29/2021 02:23 PM Town Attorney Aaron D. Arnson 04/30/2021 09:24 AM Town Manager Grady E. Miller 04/30/2021 11:41 PM Form Started By: Patti Lopuszanski Started On: 04/28/2021 09:34 AM Final Approval Date: 05/01/2021 www.fh.az.gov FOUNTAIN REHABILITATION STUDY TOWN COUNCIL PRESENTATION| MAY 11, 2021 www.fh.az.gov Agenda •Introduction •Black & Veatch Project Recap •Liner Replacement Decision Methodology / Logistics •Estimate of Probable Construction Cost •Conclusions •Council Feedback / Direction www.fh.az.gov 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 Irrigation Civil-Mechanical Electrical - I&C Likelihood of Failure Co n s e q u e n c e o f F a i l u r e Condition Assessment Scoring Recap www.fh.az.gov Project Recap Asset Evaluation Conclusions •Some equipment exceeds typical useful life but in good condition; extend life with additional specialized maintenance and testing •Immediate Recommendations: •Replace check valves (complete) •Repair pump house intake screen •Install arc flash labels on electrical equipment (complete) •Upgrade to PLC control www.fh.az.gov LINER REPLACEMENT DECISION METHODOLOGY / LOGISTICS www.fh.az.gov Liner Replacement Decision Methodology Fountain liner in good shape •Continued Periodic Evaluation … but what if ... •Known (potential) damage event •Future evaluation results show concern … need means of making logical decisions www.fh.az.gov Liner Replacement Decision Methodology: Short Term Can stay “above the line” for foreseeable future … www.fh.az.gov Liner Replacement Decision Methodology: Known Event www.fh.az.gov Lake Water Management: Known Event Sectional Dewatering Cofferdam •Size depends on severity of the damage Solution: Inflatable cofferdam Avoids other issuesPhoto credit: hydrologicalsolutions.com www.fh.az.gov Liner Replacement Decision Methodology: Deterioration www.fh.az.gov Future Liner Replacement Logistics Main issues for consideration: 1.Disposal of Fountain Lake Water 2.Removal of Aquatic Life 3.Disposal of Fountain Lake Sludge 4.Surrounding Vegetation Maintenance www.fh.az.gov Issue 1: Disposal of Fountain Lake Water Options reviewed: 1.1 Multi-stage liner replacement 1.2 Aquifer recharge of the water 1.3 Direct reuse for irrigation www.fh.az.gov 1.1 -Disposal of Fountain Lake Water Multi-Stage Liner Replacement Approach •Use cofferdams to divide the lake into sections •Dewater, relocate aquatic life, remove sludge, & reline single section •Re-introduce water, move the cofferdam(s), repeat •Inflatable cofferdam(s) www.fh.az.gov 1.1 -Disposal of Fountain Lake Water Multi-Stage Liner Replacement Advantages •Reduced volume of water to manage •Minimal management of aquatic life required •Independent of other entities (no permitting) Disadvantages •High purchase cost of inflatable dam sections •Number of reinstallations of dam segments unknown •Longer construction schedule www.fh.az.gov 1.2 -Disposal of Fountain Lake Water Aquifer Recharge Approach •Install recharge well •Lease pumping and skid-mounted treatment equipment •Pretreatment Filtration •Microfiltration Membrane •UV Disinfection •Full draw down of lake www.fh.az.gov 1.2 -Disposal of Fountain Lake Water Aquifer Recharge Advantages •Minimize construction schedule •Independent of other entities Disadvantages •Very high cost of well and equipment •Possible impacts to other wells •More technical and permitting challenges www.fh.az.gov 1.2 -Disposal of Fountain Lake Water Aquifer Recharge Why not let FHSD treat and recharge? •Minimal excess treatment capacity •Poor quality lake water requires additional pretreatment •Prefer to not recharge higher TDS lake water to their wells www.fh.az.gov 1.3 -Disposal of Fountain Lake Water Direct Reuse Approach •Lease pumping and treatment equipment (filtration skid) •Pump into ASR well recovery piping •Deliver blended AWT/Lake water to reusers •Full draw down of lake Photo credit: Aqua-Aerobic Systems, Inc. www.fh.az.gov 1.3 -Disposal of Fountain Lake Water Direct Reuse Blending AWT and Lake Water Lake TDS: 2,600 ppm AWT TDS: 1,180 ppm Two disposal scenarios evaluated: •Two-month duration •Three-month duration www.fh.az.gov 1.3 -Disposal of Fountain Lake Water Direct Reuse Two Month Duration •Average delivered TDS: 1,980 ppm Three Month Duration •Average delivered TDS: 1,690 ppm 2,000 ppm threshold for turf irrigation health www.fh.az.gov Issue 2: Management of Aquatic Life Regulatory concerns: •Public body of water •Invasive species Three management options: 2.1 Relocation (other municipal / private lakes) 2.2 Rescue (specialized species) 2.3 Euthanization (Invasive / Non-Native Species) www.fh.az.gov 2 -Management of Aquatic Life Regulatory Concerns Administrative Code •Considers capture and transport of species a violation •Defines restricted species invasive or endangered Solution: Coordination with AZGFD Area Manager Photo credit: azgfd.com www.fh.az.gov 2 -Management of Aquatic Life Regulatory Concerns AzG&FD Area Manager •May allow some flexibility regarding requirements •Sampling and identification of species at a minimum www.fh.az.gov 2 -Management of Aquatic Life Management Options Combination of all options may be necessary 2.1 Relocation 2.2 Rescue 2.3 Euthanization/Destruction Public to private transfer may have the least regulatory hurdles Temporary modification to Fountain Lake fishing ordinance www.fh.az.gov 3 -Disposal of Fountain Lake Sludge Approach •Pump liquid sludge from lake •Lease dewatering equipment •Haul dewatered sludge for landfill disposal Photo credit: msdenvironmental.com www.fh.az.gov 3 -Disposal of Fountain Lake Sludge Advantages •Relatively rapid removal of sludge to minimize odors and insects Solar evaporation not considered due to extended duration, odors & insects www.fh.az.gov 4 -Vegetation Maintenance Desire to maintain surrounding lake vegetation during liner replacement. Options 4.1 Maintain use of existing source (cofferdam) 4.2 New dedicated irrigation reservoir and pump station www.fh.az.gov 4.1 -Vegetation Maintenance Existing Lake Source Approach •Cofferdam isolating Pump House cove •Manage raw water delivery and pumping to maintain level www.fh.az.gov 4.2 -Vegetation Maintenance Dedicated Irrigation Reservoir/Pump Station Approach •Construct 500,000 gallon reservoir and new irrigation feed pumps •Source no longer connected to lake www.fh.az.gov 4.2 -Vegetation Maintenance Dedicated Irrigation Reservoir/Pump Station Other considerations •If removing irrigation draw, lake becomes a dead-end •Ever increasing TDS (dissolved solids) •Increased toxicity to aquatic life Solution: Pump lake to sanitary sewer at an equivalent rate (113gpm) to “turn over” the lake FHSD sewer line capacity coordination and low-flow periods www.fh.az.gov ESTIMATES OF PROBABLE CONSTRUCTION COST www.fh.az.gov Estimates of Probable Cost Lake Dewatering Options ONLY Task Option Estimated 2020 Cost Range Projected 2030 Cost Range Cofferdam Option $2,310,000 -$2,960,000 $3,420,000 –$4,380,000 Recharge Option $2,690,000 -$3,440,000 $3,980,000 -$5,090,000 Reuse Option $1,450,000 -$1,850,000 $2,150,000 -$2,740,000 Includes: •Aquatic life management •Sludge management and disposal •Cofferdam approach for vegetation maintenance Does Not Include: •Liner replacement www.fh.az.gov Estimates of Probable Cost Liner Replacement Assumes: •Replacement Bid in 2000 = $1.3 M •4% escalation rate Task Estimated 2020 Cost Projected 2030 Cost Liner Replacement $2,660,000 -$2,940,000 $3,990,000 -$4,410,000 www.fh.az.gov Estimates of Probable Cost Total Relining Project Costs Including: •Engineering •Construction Management •Town Contingency Task Option Estimated 2020 Cost Range Projected 2030 Cost Range Cofferdam + Relining + Engr/CM $5,930,000 -$7,020,000 $8,830,000 -$10,460,000 Recharge + Relining + Engr/CM $6,380,000 -$7,600,000 $9,520,000 -$11,320,000 Reuse + Relining + Engr/CM $4,880,000 -$5,700,000 $7,300,000 -$8,510,000 www.fh.az.gov Estimates of Probable Cost Dedicated Irrigation Reservoir / Pump Station Includes/Assumes: •1,500 gpm pump station per irrigation assessment •Subgrade reservoir located on Town property (no land purchase included) •Exterior CMU wall around pump station on top of reservoir Task Estimated 2020 Cost Projected 2030 Cost Reservoir/Pump Station $1,120,000 –$1,430,000 $1,660,000 –$2,120,000 www.fh.az.gov CONCLUSIONS www.fh.az.gov Conclusions •Use Decision Tree for liner replacement timing •Localized repair if liner damaged by known event •Plan for multi-faceted lake water reuse strategy •Additional coordination will be required (FHSD, ADEQ, etc.) •Re-users (golf course management) to understand temporary water quality impacts / aquatic life transfer •AZGFD Area Manager for aquatic life management / transfer details •Bring contractor into planning process as early as possible Photo credit: Mike Caruso www.fh.az.gov COUNCIL FEEDBACK / DIRECTION