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.