1. City of Sunrise Wastewater Reuse Program
Presented by:
Utilities Department
May 26, 2016

2. Introduction
Required by the FDEP and encouraged by the SFWMD - fulfills several goals:
Conserves a valuable resource which is currently being discharged through deep injection wells
Improves the City’s regulatory compliance
Provides potential for additional water from the Biscayne aquifer (BA)

3. Regulatory Implications
The SFWMD allows “credits” for additional water use allocation in exchange for reuse
Higher percentage of credit is provided when reuse occurs near well fields where utilities withdraw water from the Biscayne aquifer

4. Strategic Approach
Analyzed entire service area to maximize potential for BA credits while minimizing cost
Largest customers (irrigation demands) closest to the City’s BA well fields targeted
Preliminary meetings with customer, identified needs and developed initial considerations for future agreements
Designed wastewater treatment facilities and distribution pipelines for phased installation

6. Reuse System Delivery Planning started in 2011
Completion expected June 2018

7. Evaluated Sites for Highest Potential Reuse Credits
2 MGD demands to be connected in approximately four (4) project phases
Current maximum reuse demand is approximately 8 MGD

8. Centralized Conveyance System

9. Initial Max Capacity 4 MGD (max 16)
March 18, 2008
Initial Max Capacity 4 MGD (max 16) 9

10. Centralized Reuse Conveyance System
Utility Department considering recommending a Mandatory Reuse Area focusing large sites along transfer pipe (in corporate limits only)
Reuse Ordinance Update
Requiring reuse for all new development
Requires reuse for existing developments if service is provided by City to property line
Voluntary hook-ups outside of city limits

11. Infrastructure for Residential Reuse
City is replacing older community water systems, which provides an opportunity
Residential reuse infrastructure will be less expensive and logistically easier to install when water systems are being replaced
A cost benefit analysis was performed to better understand long term impacts

12. Infrastructure for Residential Reuse
March 18, 2008
Additional costs include piping extension from transmission main, the reuse system (mains, services and meters) and wider trenching
Residential reuse will also impact utility revenues, since those customers currently utilizing potable water for irrigation will no longer pay a wastewater charge for their irrigation demands

13. Cost-Benefit Analysis Performed for Residential Reuse
City’s meter data was reviewed (between years 2003 through 2012) for Sunrise Golf Village where the water system is to be replaced
Irrigation demands were calculated by analyzing seasonal and other differences in water consumption
The analysis concluded 25 to 30% of the water demands appear to be for irrigation

14. Cost/Benefit Analysis (Continued)
Capital Cost Analysis for Typical Residential Area
Cost/Benefit Analysis (Continued)
Capital Cost of reclaimed water system $2.4 M
Pipe extensions and meters $ 0.4 M
Pro rated share (HLD Treatment Costs)$ 0.3 M
Less Cost avoidance of potable trt $ 0.3 M
Net Capital Cost $ 2.8 M
Capital Cost/home ($2.8M/480 homes) $5,833/home

15. Operating Revenue & Expense Analysis for Typical Residential Area
Irrigational reuse revenue $3.34/1000
The potable water charge $3.34/1000
The wastewater charge $3.39/1000
Alt. Water Supply Savings $1.40/1000
Treat/pump water for irrigation $0.50/1000
Total Expense/residential unit $2.49/1000
Total annual expense per unit $59.76

16. Residential Reuse Payback Period Calculation for Reuse
Estimated cost to connect a single existing home to irrigational reuse = ($5,833/home)
Estimated Annual Operating Revenue/(Expense) per home from irrigational Reuse = ($59.76)
Payback Period (Years): No payback possible

17. Conclusions
Reuse in existing residential areas can be installed, but there is no payback possible
Application of reuse near water and wastewater plants and well fields maximizes potential for replacing potable water demands on BA

18. Cost-Benefit Analysis for Large Site Reuse
Average Reuse demand = 2 MGD (2,000 Tgal, Avg.)
Presuming a reuse commodity charge of $0.85/1000 gals
Estimated net revenue = = $1.75/1000 gals
Reuse revenue = $1.75 x 2,000 Tgal = $3,500/day
Revenue per customer = $3,500/40 custom. = $87.50/day
Annual Revenue per customer = $87.50 x 365 = $31,938/yr
Capital Cost for reuse = ($15.79M) Plant + ($32.75M) Piping - $19.68M (avoided cost for RO Plant) + ($0.080M) meters = 28.94
$28.94M/40 customers = $723,500/customer
Payback = $721,679/$31,938/year = 22.6 Years

19. Current Status of Reuse Program
New Sawgrass Reuse Plant soon under construction adding 4 MGD (HLD) Reuse capacity (max).
Sawgrass HLD Plant Improvements scheduled for completion in 2018
Southwest HLD nearly complete (0.99 MGD)
Distribution System projects currently slated to serve larger users in vicinity of plant wellfields, such as golf courses, parks, commercial properties
Initial Phase of distribution system to be completed in 2018.

20. Q&A

22. SFWMD Limiting Conditions

23. Cost/Benefit Analysis (Continued)
Residential Capital Cost Analysis (Continued)
Estimated cost for reuse treatment and pumping systems at the wastewater treatment plant is ($253,172) for this amount of demand
Cost avoidance or savings for additional potable water treatment relative to reduced demand at WTP estimated at $315,616

24. Cost/Benefit Analysis (Continued)
Capital Cost Analysis (Continued)
Resulting cost for service = ($2,400,000) + ($335,280) + ($72,000) + ($253,172) - $315,616 = $2,744,836
$2,744,836/480 homes = $5, cost to connect (each)

25. Operating Revenue and Expense Analysis (Continued)
Cost saved by avoiding Alternative Water Supply Treatment and Delivery is $1.40/Tgal
Estimated Additional cost to treat and pump reclaimed water for irrigation purposes is ($0.50/Tgal)
Estimated operating revenue/(expense) per Tgal for residential reuse = – 0.50 = ($2.49)

26. Operating Revenue and Expense Analysis (Continued)
Annual Irrigational Reuse Consumption per Home (Tgal) = 24 units
Estimated annual Operating Revenue/(Expense) per home from Irrigational Reuse = ($2.49) x 24 = ($59.76)