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HomeMy WebLinkAbout5.a. Splash Pad Feasibility Report EXECUTIVE SUMMARY Utility Commission Meeting: June 20, 2016 AGENDA SECTION: AGENDA ITEM: Splash Pad Water Recirculation System PREPARED BY: AGENDA NO. Patrick Wrase, PE, Director of Public Works / City Engineer ATTACHMENTS: Update to Central Park Splash Pad Reuse APPROVED BY: Assessment – Recirculation Retrofit Option RECOMMENDED ACTION: Discussion ISSUE At the January 25, 2016 Utility Commission meeting, staff was directed to explore the feasibility of a recirculation system retrofit for the Central Park Splash Pad (splash pad). Staff wishes to update the Utility Commission on the results of the feasibility study. BACKGROUND Water use at the splash pad exceeded 11 million gallons in 2015. Because of the ongoing concerns with the groundwater supply throughout the metro area, re-use options have been explored for the splash pad. The attached Update to Central Park Splash Pad Reuse Assessment outlines the cost to retrofit the splash pad with a recirculating system that will reduce total City water usage by 1.1% annually, or approximately 9.2 million gallons per year. Per the feasibility study, the estimated cost to construct the recirculation system is $432,000. The Vermillion River Watershed Joint Powers Organization (VRWJPO) has applied for a $125,000 Metropolitan Council grant on behalf of the City. If that grant is approved, the VRWJPO will contribute an additional $40,000, reducing the City’s net cost to $267,000. Staff is expecting notification of the approval or denial of the grant money by the end of June 2016. Table 1 shows the estimated maintenance and operating costs for the both the current system and the recirculating system. As illustrated in Table 1, the annual net savings with the recirculating system is estimated to be $17,593. Table 1 – Estimated Annual Maintenance and Operating Costs Current System Recirculating System Water $28,894 $649 Sewer - $49 Maintenance (Labor) $4,240 $10,600 Parts $1,000 $2,000 Chemicals - $395 Electricity $300 $3,149 Total Operating Costs $34,434 $16,841 Net savings $17,593 C:\\Users\\caw\\AppData\\Local\\Temp\\5.a. Splash Pad Feasibility Report_362972\\5.a. Splash Pad Feasibility Report.docx Assuming an initial cost of $267,000 and annual savings of $17,593 (adjusted 3% annually), the return on investment is 12.5 years, as illustrated in Table 2. Without the additional grant money, the return on investment is 18.5 years. Table 2 $432,000 Initial Cost Without Grants $267,000 Initial Cost With Grants Estimated Cumulative Year Annual Savings Savings 1 $ 17,593 $ 17,593 2 $ 18,121 $ 35,714 3 $ 18,664 $ 54,378 4 $ 19,224 $ 73,603 5 $ 19,801 $ 93,404 6 $ 20,395 $ 113,799 7 $ 21,007 $ 134,806 8 $ 21,637 $ 156,443 9 $ 22,286 $ 178,729 10 $ 22,955 $ 201,684 11 $ 23,644 $ 225,328 12 $ 24,353 $ 249,680 13 $ 25,083 $ 274,764 14 $ 25,836 $ 300,600 15 $ 26,611 $ 327,211 16 $ 27,409 $ 354,620 17 $ 28,232 $ 382,852 18 $ 29,079 $ 411,930 19 $ 29,951 $ 441,881 20 $ 30,849 $ 472,730 21 $ 31,775 $ 504,505 22 $ 32,728 $ 537,234 23 $ 33,710 $ 570,944 24 $ 34,721 $ 605,665 25 $ 35,763 $ 641,428 26 $ 36,836 $ 678,264 27 $ 37,941 $ 716,205 SUMMARY The feasibility of this project is contingent upon the receipt of grant funds from the Met Council and VRWJPO. At this time, staff is seeking Utility Commission feedback regarding the proposed recirculating system for the splash pad. 2 Building a legacy – your legacy. 701 Xenia Avenue South Suite 300 Minneapolis, MN 55416 Tel: 763-541-4800 Fax: 763-541-1700 Equal Opportunity Employer wsbeng.com K:\02235-070\Admin\Docs\MEMO - Recirculation Splash Pad System_pwrase_052516.docx Memorandum To: Pat Wrase, City Engineer/Public Works Director - City of Rosemount From: Bill Alms, WSB & Associates Cc: Mitch Hatcher, WSB & Associates Jason Amberg, WSB & Associates Date: May 25, 2016 Re: Update to Central Park Splash Pad Reuse Assessment – Recirculation Retrofit Option WSB Project No. 02235-070 A splash pad water reuse assessment was completed for the City of Rosemount in February of 2014 as part of the design process for the Central Park Splash Pad. At that time, the decision was made to construct a flow-through system that drains water used in the Splash Pad to Erickson Pond via the existing storm sewer. In February 2016, the Rosemount Utility Commission requested an update of the Splash Pad Recirculation option (Option 1) from the “Central Park Splash Pad Reuse Assessment” to reflect the additional cost of a retrofit installation as well as provide any updates to the annual operation and maintenance cost. The updated cost information is outlined in the paragraphs below. Project Cost Update: As part of the data collection process, WSB contacted Commercial Recreations Specialist, the supplier of the existing splash pad equipment, and requested a scope of supply for the recirculation system and an estimate for the installation cost of the recirculation equipment. The retrofit layout exhibit shown below outlines the splash pad site modification required to install a recirculation system based on the manufacture’s recommendations. The splash pad recirculation retrofit would divert discharge water from the existing splash pad storm drain into an underground holding tank. Water from the tank would then be pumped through a filter and chemical sanitation system and recirculated into the splash pad distribution system. The existing water service connection would be used to provide make up water lost due to evaporation and swimmer usage. A new sanitary connection will be required to discharge the filter backwash. See Appendix A for additional vendor information and equipment drawings. Pat Wrase May 25, 2016 Page 2 All costs presented in the original reuse assessment were assumed to be part of the initial construction contract. Since the recirculation retrofit would now be a standalone project, the following additional cost have been included in the updated project cost located in table below and Appendix B: • Additional mobilization and instillation cost • Replacing existing splash pad manifold to be compatible with recirculation system • Modifying storm sewer routing to storage tank • Disconnecting and reconnection water service and numerous splash pad internal plumbing connections • Adding Sanitary sewer connection • Additional indirect cost – contract administration, plans, specifications, permitting, bidding, and construction observation. Splash Pad Recirculation Systems Cost Update Comparison Estimated Totals (2014 Reuse Study) Option 1 – Recirculation System Initial - $258,000 Annual2 - $ 16,600 (2016 Update) Option 1 – Recirculation System (See Appendix C for additional annual cost details) Initial1 - $432,000 Annual2 - $ 16,841 1 – See Appendix B for Opinion Cost Estimates and Vendor Scope of Supply. 2 – Annual cost includes estimated water, electricity, chemical usage charges along with projected maintenance costs. See certified Pool operator section for annual operator cost details. Pat Wrase May 25, 2016 Page 3 The updated long term cost analysis located in Appendix C, shows that after 15 years of operation the total cost of the recirculation system retrofit is about $168,000 more than the total cost of the existing flow-through system. This is because the initial and annual operating costs are so high compared to the annual savings in water usage. If at some point in the future the splash pad is not able to discharge effluent water into Erickson Pond either through regulatory changes or through degradation in infiltration performance of the wetland, this bias for the flow-through system could easily be eliminated. Annual Operating Cost - Certified Pool Operator Minnesota Department of Health requires that public pools with recirculation systems are required to have a certified pool operator (CPO). A trained CPO must successfully complete a recertification course at least once every five years. The initial qualification is a 2 day course and cost around $275. The CPO will need to be on call whenever the splash pad is in operation. Contract CPOs are available as an alternate to training City Staff or for weekend and holiday on call periods. Go Get Fred Pool Maintenance services out of Eden Prairie, MN is contracted with the City of Bloomington to run their splash pad on weekends and holidays for a rate of $90/day Additional services such as system start-up and winterization can also be contracted if desired. The estimated annual cost for City staff to operate the splash pad during the week with contracted CPO on weekends and holidays would be $10,600. This cost includes 90 days of operation, system start up, and winterization. Pat Wrase May 25, 2016 Page 4 APPENDIX A Splash Pad Retrofit Exhibit and Vendor Drawings Vortex Aquatic Structures International vortex-intl.com 1.877.586.7839 WATER AND ENERGY CONSERVATION BUILT-IN WATER QUALITY MANAGEMENT SYSTEM: DOMEPACK Vortex Water Quality Management Systems (WQMS) are specifically engineered and constructed to handle the heavy usage that Splashpad® need to endure. Vortex offers several WQMS models to accommodate various flow rates, heal and safety codes with special features that significantly reduce water and energy consump- tion. Vortex WQMS incorporate only high quality commercial grade components to ensure the most reliable system and backed by an industry leading warranty. Splashpad® Water Management System Distributes the water to the Water Features on the Splashpad®. Both flow and water pressure can be ad- justed to optimize the operation of each independent spray feature. The primary components of the WDS are: • Stainless steel manifold provides the structural backbone to resist water hammer and vibration. • Solenoid valves are connected to the system controller to create spray sequences. • Circulation pump provides the power to move the water through the system. • By-pass system protects the circulation pump from dead heading. Removes organic and/or inorganic suspended particles from the water. The filters used are commercial grade, high rate, sand media filters. Incorporating the Vortex Debris Control System will provide a primary screening of larger particles prior to entering the sand filters resulting in less backwashing, water use and maintenance. Provide play feature sequencing, operational time control, water flow and water quality monitoring and adjustment. The primary components consist of: • Smart Touch Logics Controller controls the operational hours, spray sequences and interfaces with the mot- tor starter and chemical controller to respond to any alarm conditions. • Water Chemistry Controller, see Sanitization system. • Variable frequency drives for pumps regulate water pressure, flow and reduce energy consumption. • Flow meters provide readings on filtration rates and circulation rates to ensure proper operation and man dated by most health regulations. B. Filtration System C. Automation and Control Systems The Vortex Domepack The Vortex Water Quality Management System (WQMS) consists of 5 sub-systems: A. Water Distribution System (WDS) A) Water Quality Management System (WQMS) B) Playsafe Drain C) Debris Control System (DCS) with Rain Control System (RCS) D) Water Containment System (WCS) B C D A Splashpad® Figure 1. IILUSTRATION OF WATER CIRCULATION AND SUBSYSTEMS OF THE WMS Vortex Aquatic Structures International vortex-intl.com 1.877.586.7839 Splashpad® Water Management System 168" (427cm) 41" (104cm) 29" (73cm) 72" (182cm) Contributes to providing healthy water conditions for the safe operation of Splashpad®. The main components consist of: • Water Chemistry Controller provides continuous monitoring and adjustments of chemical additions to prevent overdosing balanced chemistry. It is equipped with an alarm signal to indicate an imbalance or conditions outside of safe parameters. • Chemical Feed System comes with injection pumps and liquid chemicals or a chlorinator such as the Pulsar 3 systems. • Chemical containment, offered in a below-grade or above-grade option for liquid chlorine and muriatic acid system. • Utraviolet system, the optional UV light disinfection system provides added protection against nuisance microorganisms in water such as Cryptosporidium Parvuum. The system is integrated into the Vortex WQMS to provide proper compatibility and smooth operation. D. Sanitization System Industry Leading Warranty all standard Domepack and Skidpack systems are backed by a comprehensive warranty. Training and Start-up programs As with all recreational water treatment systems, the Vortex WQMS requires a daily maintenance by trained staff. Vortex offers training programs and system start-up services to ensure the successful implementation and operation of your system. Please inquire about these services with Vortex or our local representative. Vortex offers Optional Service Plans & Training • Vortex Premium Service Plan • Vortex Certified Maintenance Program • Vortex Certified Training Program Is an effective solution to place a Vortex WQMS in a public park or environment without a building to house the system. Its elegant low profile design coupled with robust construction and high resistant materials the Dome will discretely blend into the environment while resisting potential vandalism. E. Dome enclosure System equipment vault equipment vault • Durable self-enclosed below-grade enclosure to keep equipment out-of-sight • Aluminum access hatch and step-down grate for easy access • Stainless steel manifold • Easy access for solenoid valves maintenance • Drain access points for line winterization World leader in aquatic play solutions with over 6,000 installations worldwide vortex-intl.com • info@vortex-intl.com 1.877.586.7839 (free USA/CND) • +1.514.694.3868 (INTERNATIONAL) command center Pat Wrase May 25, 2016 Page 5 APPENDIX B Opinion Cost Estimate and Vendor Equipment Quote K:\02235-070\Admin\Docs\Memo\02235-070 - Feasibility City of Rosemount Feasibility Central Park Splash Pad Water Reuse Assessment WSB Project No. 02235-070 Cost Opinion Recirculation Retrofit Option Item Description Unit Quantity Unit Cost Extended Cost 1 MOBILIZATION LS 1.00 $25,000.00 $25,000.00 2 DISCONNECT WATER SERVICE EA 1.00 $100.00 $100.00 3 REMOVE SEWER PIPE (STORM)LF 10.00 $25.00 $250.00 4 SALVAGE AND REINSTALL LANDSCAPE LS 1.00 $500.00 $500.00 5 COMMON EXCAVATION CY 400.00 $18.00 $7,200.00 6 VORTEX DOMEPACK WQMS RETROFIT LS 1.00 $239,750.00 $239,750.00 7 CONNECT TO EXISTING SANITARY SEWER EA 1.00 $1,200.00 $1,200.00 8 CONNECT TO EXISTING STORM SEWER EA 1.00 $850.00 $850.00 9 15" HDPE PIPE SEWER LF 25.00 $30.00 $750.00 10 15" HDPE PIPE SEWER (DIRECTIONALLY DRILLED)LF 50.00 $150.00 $7,500.00 11 4" HDPE SANITARY SEWER (DIRECTIONAL DRILLED)LF 450.00 $75.00 $33,750.00 12 IRRIGATION SYSTEM REPAIR LS 1.00 $750.00 $750.00 13 RECONNECT WATER SERVICE EA 1.00 $1,000.00 $1,000.00 14 4" POLYSTYRENE INSULATION SY 20.00 $40.00 $800.00 15 CONST DRAINAGE STRUCTURE DES 48-4020 LF 5.00 $400.00 $2,000.00 16 CASTING ASSEMBLY EA 2.00 $600.00 $1,200.00 17 CONSTRUCT 48" DIAMETER SANITARY SEWER MANHOLE LF 5.00 $200.00 $1,000.00 18 SILT FENCE, TYPE MACHINE SLICED LF 250.00 $2.50 $625.00 19 STORM DRAIN INLET PROTECTION EA 3.00 $150.00 $450.00 20 SODDING TYPE LAWN SY 300.00 $5.00 $1,500.00 Subtotal $326,180.00 +15% Contingency $48,930.00 Subtotal $375,110.00 +15% Indirect Costs $56,270.00 Total Splash Pad Reuse Improvements $432,000.00 QUOTE NO: 20160307-JC2 DATE: QUANTITY UNIT PRICE EXT PRICE 1 138,931.49$ 138,931.49$ 1 3,000.00$ 3,000.00$ TERMS 30% Down SHIPPING TIME 10 Weeks A.R.O.SUBTOTAL 141,931.49$ THIS QUOTATION IS VALID FOR 30 DAYS.FREIGHT 2,976.00 TOTAL 144,907.49$ MN Office: (608) 333-1654 Toll Free Corp. Office: (877) 896-8442 Corp. Fax: (608) 848-8782 Corporate Office: 807 Liberty Drive, Suite 101, Verona, WI 53593 www.crs4rec.com VORTEX DOMEPACK WQMS RETROFIT TO INCLUDE: - DOMEPACK WQMS Double Loop System, 5HP Feature Pump, 3HP Filtration Pump 1 Sand Filter, 15 Solenoid Valves, Maestro Ctrl 32out/8in Becsys 3 Chemical Ctrl, 208-230V 3 Phase Power - CONICAL STRAINER BASKET PASSIVATION (PLAYSAFE DRAIN) - SKIMMER RETROFIT FOR HOLDING TANK - UV ECP-113-5SPV 260/176/100GPM DOME 230V 1-3PH, 4" PIPING - WATER CONTAINMENT SYSTEM 3000 GALLON - WATER DISTRIBUTION SYSTEM (VCC) Vault Command Center - Water-Recirculation Double 3" Inlet, Without Pressure Regulator; Backflow Preventer Not Included, Controller Remotely Located, Manifold - 10x 1-1/2" PVC Solenoid Valve Line w/ Ball-Valve to be provided by customer. WQMS Startup & Training by Vortex QUOTE March 7, 2016 DESCRIPTION Quotation prepared by: ____________________________________________ Jeff Corniea To accept this quotation, sign and return ________________________________ DATE ____________________ Central Park Splashpad WQMS SystemCity of Rosemount Dan Schultz 13885 South Robert Trail Rosemount, MN 55068 PROJECT:CUSTOMER: Pat Wrase May 25, 2016 Page 6 APPENDIX C Splash Pad Vendor Cost and Usage Estimates Commercial Recreation Specialist Developed for Central Park Splash Pad, Rosemount, MN 4130 SQFT 4130 SQFT FLOW THRU WQMS 220 GPM 254 GPM EQUIPMENT COSTS -$ 239,750$ ESTIMATED TOTAL PROJECT COSTS -$ 432,000$ WATER COSTS 28,894$ 649$ SEWER COSTS -$ 49$ MAINTENANCE COSTS (LABOR)4,240$ 10,600$ NORMAL PARTS COSTS 1,000$ 2,000$ CHEMICAL COSTS -$ 395$ ELECTRICAL COSTS 300$ 3,149$ TOTAL ANNUAL OPERATING COSTS 34,434$ 16,841$ ESTIMATED 10 YEAR OPERATING COSTS 344,338$ 168,412$ TOTAL 10 YEAR COST 344,338$ 600,412$ ESTIMATED 15 YEAR OPERATING COSTS 516,507$ 252,618.30$ TOTAL 15 YEAR COST 516,507$ 684,618$ PARAMETERS AND ASSUMPTIONS GALLONS PER DAY USED 123,478 2,773 COST OF WATER PER GALLON 0.0026 0.0026 COST OF SEWER PER GALLON 0.0000 0.0018 MAINTENANCE LABOR RATE PER HOUR 40 50 * DAILY MAINTENANCE TIME REQUIRED (IN MAN HOURS)1 2 SEASONAL MAINTENANCE HOURS 16 32 OPERATING HOURS PER DAY 10 10 10 DAYS IN SEASON 80 90 90 *$50/hour based on 80% City Staff Maint. / 20% Contract Maint SPLASHPAD LIFE CYCLE COSTS 10 AND 15 YEARS ESTIMATED SPLASHPAD CONSTRUCTION COSTS ESTIMATED ANNUAL MAINTENANCE AND OPERATING COSTS Flow Thru Cost Estimator Estimated Splashpad Drain Away System Imperial Total Play product Flow 317 Total Play based on piping and electrical diagram. Manifold Capacity 275 Manifold Capacity based on piping and electrical diagram. Use lesser amount 275 Average Sequence Flow Rate 220 Average Vortex Sequencing Program 80% System Flow after Downtime Between Activation Factor 198 Maximum Flow per hour 11880 Hours per Season 900 Consumption per Season (gallons)10692000 Average Daily Consumption (gpd)118800 Average Daily Consumption (cf)15884 Hundred Cubic Feet per Season (HCF)14295 Usage Estimate based on degree Days Temperature F/C Hours Per day Days per Season Hours of Use per Season 70-79 (21-26)10 61 608 80-90 (27-31)10 15 146 90-99 (32-37)10 11 113 100+ (38+)10 3 34 Total 90 900 Note: Days per season = 100 days - 20 days of rain within season Evaporation and bather load loss 0.00% Water meter cost per 1000 gal $2.600 Sewer cost per 1000 gal $0.00 Total Cost per season $27,799.20 Annulized Water Consumption gpd 29293 Additional municipal fees that may apply within Rosemount 6 Mth Fee Fixed Water Charge 80$ aporox. Fixed Sewer Charge -$ Sewer Usage -$ Cap Improvement Fund Fixed Charge 40$ aporox. Storm Water Charge -$ Pad Total Combined Seasonal Operation Cost 27,919.20$ Site Staffing ? Maintenance Staff ? Other ? Total Operating and Staffing Costs Page 3Central Park Splashpad Operating and Maintenance Costs Comparison_052316.xls WQMS Operating Cost Estimate 4130 SQFT @ 317 GPM Estimate is based on an operation season of 900 hours or 10 user available hours per day over 80 days Daily Energy Costs Estimate (kilowatt hours) Amps Voltage Watts Operating Hours Kilowatt Hours Average Electricity Vortex Controller 8 110 880 9 7.92 Cost per kWh Chemical Controller 1 110 110 22 2.376 Chemical Pump 0.7 110 77 5 0.3465 Circulation Pump 36 230 12190.174 9 109.7115623 Filtration Pumps 20.8 230 7043.2114 22 152.1333663 Total kWh 272.4874286 0.13$ Estimated Daily Energy Cost 35.42$ Notes: Seasonal Energy cost (900hrs of operation)3,148.74$ Single Phase Watts = Amps x Voltage Three Phase Watts = (Amps x Voltage) x 3^0.5 x .85PF Kilowatt Hours = (Watts x Hours of operation)/1000 Approximate Operating Costs* = Kilowatt hours x Average Cost per Kilowatt Hour * Does not include power factor penalty or demand charges which may be applicable in some areas Daily Chemical Consumption Estimate Due to varying operational conditions typical to a Splashpad instalation, variables such as bather loading, and environmental debris (grass clippings,leaves, etc.) may increase chemical consumption. Chemical Consumption Estimate GPD Season consumption Cost per gallon Chlorine (liquid) gallon per day 1 90 Gallons $3.00 Muriatic Acid gallon per day 0.33 29.7 Gallons $4.20 Total Seasonal Cost $394.74 Make Up Water Consumption Estimate WQMS Make Up Water Consumption Imperial Number of Users per day 300 Total Play product Flow 317 Average Sequence Flow Rate 253.6 Maximum Flow per hour 15216 Hours per Season 800 Spray Volume per Season (gallons)12172800 Fill volume (Gallons)3000 Bather Run Off Gallons Per Day (estimate 1/4g/bather)75 Environmental Loss (Percentage of Sprayed Water)2% Overflow loss (Gallons)2% Winterization sewer loss (Gallons)3000 Backwash (Gallons per month)1000 Page 4Central Park Splashpad Operating and Maintenance Costs Comparison_052316.xls Splashpad Usage Estimate based on degree Days Note: Days per season = 100 days Temperature F/C Hours Per day Days per Season Hours of Use per Season 70-79 (21-26)10 61 608 80-90 (27-31)10 15 146 90-99 (32-37)10 11 113 100+ (38+)10 3 34 Total 90 900 Total Fresh Water Make up (gallons)249591.00 Total Fresh Water Make up (1000 Gal)249.59 Total Sanitary Waste Water (gallons)30332.73 Total Sanitary Waste Water (1000 Gal)30.33 Water meter cost per 1000 Gal $2.60 Sewer cost per 1000 Gal $1.80 Total Cost per season $703.54 Combined Seasonal Operation Cost for Splashpad 4,247.02$ Fixed Water Charge 80.00$ Per 6 month Fixed Sewer Charge 47.00$ Per 6 month Cap Improvement Fund Fixed Charge 40.00$ Per 6 month Storm Water Charge 10.00$ Per 6 month TOTAL 4,424.02$ Will a bathhouse with restrooms and showers be required? If yes: What is the cost of the construction of these items. How much gpd of water will the showers/restrooms use and drain to sanitary sewer. Whats the cost associated with the utilities. What is the maintenance cost associated with a bathhouse Will addittional design fees and stamps be necessary? Will barrier fencing be required? Will additional staffing be required? If your state requires a Splashpad with a recirculation system to comply with local swimming pool codes you may need to consider construction and operational costs associated other infrastructure elements when planning.