Northwest Hillsborough County Northwest Hillsborough County Reclaimed Water SystemReclaimed Water System

Presented at thePresented at theSpring 2002 Quarterly Spring 2002 Quarterly Reuse Coordinating Reuse Coordinating Committee MeetingCommittee Meeting

Presented by:Presented by:Ed FoxEd FoxNick Nick LoPrestiLoPrestiBob HendersonBob HendersonMikeMike LehighLehighMark McNealMark McNeal

Hillsborough CountyHillsborough CountyDale Dale Mabry Mabry AWTPAWTPTampa, FLTampa, FL

May 15, 2002May 15, 2002

Presentation OverviewPresentation Overview

Background and Initial Planning ActivitiesBackground and Initial Planning ActivitiesReclaimed Water User ProfileReclaimed Water User ProfileReclaimed Water ASRReclaimed Water ASRFinal System PlanningFinal System PlanningSystem Design and ConstructionSystem Design and ConstructionReal Time Monitoring and Control SystemReal Time Monitoring and Control SystemSystem StartSystem Start--up Lessons Learnedup Lessons Learned

Major Objectives of the Reuse Major Objectives of the Reuse ProgramProgram

• Maximize conservation benefit• Don’t over commit the resource• Provide reliable service• Provide efficient maintenance of system

System StatisticsSystem Statistics

• WWTP Facilities

•6 Regional AWT Plants

• 1 Sub-Regional Advanced Secondary

• 35.4 MGD Permitted Capacity 2002

• Reclaimed Water Facilities

•80 miles of transmission mains

•100 miles of distribution mains

•115 MGD pumping capacity

•81 MG of above ground storage

•ASR system under development

Who are our customers ?

• Single Family Residential• Commercial • Golf Courses• Industrial• Agricultural

CountyCounty--wide Reclaimed Water Usage wide Reclaimed Water Usage by Customerby Customer

Commercial22%

Residential29%

Industrial23%

Agricultural1%

Golf Course25%

4.01 MGD

3 .11 MGD

3.47 MGD

3.05 MGD

August 2000 - August 2001

Total AADF Reuse - 13.79 MGD

CountyCounty--wide Customer Base and Reuse wide Customer Base and Reuse DemandsDemands

Table 1 – Customer BaseDemands in MGD

2000 2020Customer Category Number of

CustomersReuse

DemandNumber ofCustomers

ReuseDemand

Residential (single family) 6,336 3.27 25,960 14.40Commercial 102 2.33 277 7.45Golf Course 12 3.35 21 7.76Industrial 3 2.84 9 7.49Agricultural 2 0.08 4 0.15

Total: 6,503 11.87 26,271 37.25

Overall Water Conservation Success!Overall Water Conservation Success!HILLSBOROUGH COUNTY WATER DEPARTMENT POTABLE WATER DEMAND

0

10

20

30

40

50

60

1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004

CALENDAR YEAR

TOTA

L SY

STEM

PR

OD

UC

TIO

N (

mgd

)

12-Month Avg

No ConservationNO CONSERVATION(1989 PER CAPITA)

12.4 MGD12.4 MGDSAVINGSSAVINGS

Economic ConsiderationsEconomic Considerations

Cost analysis to select projectsCost analysis to select projectsFunding capital projectsFunding capital projects–– Approximately $116 million spent Approximately $116 million spent

since 1978since 1978–– SWFWMD funding contribution SWFWMD funding contribution

of $11 millionof $11 million

Current reclaimed water rates Current reclaimed water rates based primarily on old effluent based primarily on old effluent disposal mindsetdisposal mindset

Rate StructureRate Structure

Residential Residential -- $9.00 per month flat fee$9.00 per month flat fee

Commercial Commercial -- $9.00 base charge$9.00 base charge$.60/1000gal for the 1st 100,000 gallons

$.08/1000gal for the 2nd 29,900,000 gallons

$.06/1000gal over 30,000,000 gallons

Current

Proposed Changes for Spring 2002

Inclining Conservation Rate for Commercial and Industrial Customers

Metered rate for new residential customers not grandfathered in by BOCC

HillsboroughHillsboroughCounty County Reclaimed Reclaimed Water Water Service Service AreasAreas

Northwest Northwest Hillsborough Hillsborough County County Reclaimed Reclaimed Water Water Service Areas Service Areas

Background Background

Significant development in Northwest Significant development in Northwest Hillsborough County since the early 1990sHillsborough County since the early 1990sTampa Bay area droughtTampa Bay area drought--sensitive and sensitive and freshwater resources limitedfreshwater resources limitedObjective to expand beneficial use of Objective to expand beneficial use of reclaimed water in this area by interconnecting reclaimed water in this area by interconnecting four water reclamation facilities four water reclamation facilities Provide a tool to manage reclaimed water for Provide a tool to manage reclaimed water for the futurethe future

Reclaimed Water Use ProjectionsReclaimed Water Use Projections

Seasonal reclaimed water demand will outpace Seasonal reclaimed water demand will outpace dry weather reclaimed water availability dry weather reclaimed water availability Dry weather peak demands limit the Dry weather peak demands limit the connection of new customers connection of new customers –– Dry season Peak Day Flow = 2 x AADFDry season Peak Day Flow = 2 x AADF–– Dry season Peak Hour Flow = 4 x AADFDry season Peak Hour Flow = 4 x AADF–– Dry season supply 5 to 10 percent less as wellDry season supply 5 to 10 percent less as well

Reclaimed water service will be limited until Reclaimed water service will be limited until seasonal storage (ASR) can be implemented seasonal storage (ASR) can be implemented

Dry Season Reclaimed Water Availability Dry Season Reclaimed Water Availability With and Without ASR (NW Service Area)With and Without ASR (NW Service Area)

A phased ASR A phased ASR program would boost program would boost reclaimed water reclaimed water availability during the availability during the dry seasondry seasonASR will allow ASR will allow connection of >25% connection of >25% more customers more customers

0

5

10

15

20

25

30

1999 2000 2005 2010 2015 2020

W/O ASR

With ASR

MG

D

Water Conservation Benefits with ASR in Water Conservation Benefits with ASR in Average Daily Flow (NW Service Area)Average Daily Flow (NW Service Area)

0

1

2

3

4

5

6

7

2000 2005 2010 2015 2020

PotableGround

MG

D

4.57.8

9.410.1

10.4

New Transmission LineNew Transmission LineNew Transmission LineNew Transmission LineExisting Transmission Line

Proposed Transmission LineProposed Transmission LineProposed Transmission Line

Northwest Reuse Plan

Reuse Permitting BoundaryReuse SitesWellfield SiteWastewater Treatment PlantPump Station & Storage

Proposed Transmission LinePotential Transmission Line

System Design and ConstructionSystem Design and Construction

River Oaks 17 mgd effluent pumping stationRiver Oaks 17 mgd effluent pumping station3 high service reclaimed water pumping stations 3 high service reclaimed water pumping stations --total capacity of >20,000 total capacity of >20,000 gpmgpm and 5 mg of storageand 5 mg of storage14 miles of 1214 miles of 12--inch to 30inch to 30--inch transmission linesinch transmission linesInitial ASR pilot systemInitial ASR pilot system2 remote residential master metering sites2 remote residential master metering sites2 remote golf course metering sites2 remote golf course metering sitesA remote monitoring telemetry control systemA remote monitoring telemetry control system

River Oaks Effluent Pumping StationRiver Oaks Effluent Pumping Station

River Oaks Reclaimed Water River Oaks Reclaimed Water Storage and Pumping StationStorage and Pumping Station

River Oaks Reclaimed Water River Oaks Reclaimed Water Pumping StationPumping Station

Reclaimed Water ASR SystemReclaimed Water ASR System

ASR will allow optimizing the ASR will allow optimizing the seasonal use of reclaimed waterseasonal use of reclaimed waterInitial well constructed and testing Initial well constructed and testing underway for nearly one yearunderway for nearly one yearCycle testing of initial well will Cycle testing of initial well will lead to operational permitting and lead to operational permitting and provide design criteria for provide design criteria for construction of future ASR wellsconstruction of future ASR wells

ASR Site Compatible with Area ASR Site Compatible with Area Water ResourcesWater Resources

Suwannee Limestone

Avon Park Limestone

Alafia River

HillsboroughRiver

Tampa BypassCanal

Ocala Limestone

Tampa Limestone

ASR Well(typ.)

Construction of Initial ASR WellConstruction of Initial ASR Well

Hillsborough County has FloridaHillsborough County has Florida’’s first s first reclaimed water ASR wellreclaimed water ASR well

First to receive UIC First to receive UIC permit (Nov. permit (Nov. ‘‘97)97)First well constructed First well constructed (Spring (Spring ‘‘98)98)First to be granted First to be granted permission to cycle permission to cycle test (Fall test (Fall ‘‘98)98)First to begin cycle First to begin cycle testing (July 2001)testing (July 2001)First to place ASR First to place ASR water into reuse water into reuse system (Jan. 2002)system (Jan. 2002)

Significant issues addressed with Significant issues addressed with Hillsborough CountyHillsborough County’’s ASR Systems ASR System

Reclaimed water ASR Reclaimed water ASR permittabilitypermittability confirmedconfirmed22--Diethylhexyl Phthalate (DEHP) issue resolvedDiethylhexyl Phthalate (DEHP) issue resolvedNative groundwater characterization and definitionNative groundwater characterization and definition–– what defines an aquifer as less than 1,000 mg/L TDS?what defines an aquifer as less than 1,000 mg/L TDS?

DBPsDBPs successfully controlled using chloraminessuccessfully controlled using chloramines–– will likely seek a variance for the long haulwill likely seek a variance for the long haul

Total coliform presence in reuse system and Total coliform presence in reuse system and MWsMWs–– wet/dry cycles in open environmentswet/dry cycles in open environments–– transmission system is not a drinking water systemtransmission system is not a drinking water system–– monitoring wells are not monitoring wells are not ““sterilesterile””

Cycle testing discharges through Cycle testing discharges through permitted reclaimed water outfallspermitted reclaimed water outfalls

Hillsborough County Cycle Test No. 1Hillsborough County Cycle Test No. 130 MG successfully recharged and recovered30 MG successfully recharged and recoveredDBP control during rechargeDBP control during recharge–– ChloraminationChloramination system reduced THMs from about system reduced THMs from about

175 ppb to about 100 ppb175 ppb to about 100 ppb–– Ammonia addition followed chlorinationAmmonia addition followed chlorination

Recovered water quality met reuse standards Recovered water quality met reuse standards without further treatmentwithout further treatment–– TSS, BOD, and fecal coliform standards metTSS, BOD, and fecal coliform standards met

Presence of varying amounts of total coliform in Presence of varying amounts of total coliform in recharged and recovered waterrecharged and recovered waterSurface water discharge to waste Surface water discharge to waste

Additional Hillsborough County Additional Hillsborough County cycle testing is ongoingcycle testing is ongoing

Cycle No. 2 recharged 45 MG and recovered Cycle No. 2 recharged 45 MG and recovered approximately 13 MG to the reuse systemapproximately 13 MG to the reuse system–– TTHM control much improved during recharge by TTHM control much improved during recharge by

adding ammonia prior to chlorinationadding ammonia prior to chlorination–– Total coliform standards met in recharge waterTotal coliform standards met in recharge water–– Increasing TDS limited recovery to about 30%Increasing TDS limited recovery to about 30%

Cycle No. 3 recharged approximately 45 MGCycle No. 3 recharged approximately 45 MG–– BackBack--toto--back total coliform >4cfu/100ML caused back total coliform >4cfu/100ML caused

recharge operations to cease short of 90 mg targetrecharge operations to cease short of 90 mg target–– Recovery began May 6, 2002Recovery began May 6, 2002–– Alternative total coliform control consideredAlternative total coliform control considered–– Providing a beneficial use this yearProviding a beneficial use this year

Efficient Management and Operation of Efficient Management and Operation of System Required Innovative SolutionsSystem Required Innovative Solutions

County goal to merge operations of potable County goal to merge operations of potable and reclaimed water systemsand reclaimed water systemsThe system includes over 30 individual The system includes over 30 individual treatment, pumping, storage, or bulk user treatment, pumping, storage, or bulk user monitoring points monitoring points -- > 500 I/O points> 500 I/O pointsService area over 100 square milesService area over 100 square milesRemote telemetry monitoring control Remote telemetry monitoring control system (RTMC) requiredsystem (RTMC) required

RTMC Planning and Design CriteriaRTMC Planning and Design CriteriaCounty merged the management and operations of County merged the management and operations of potable and reuse systems to improve efficiencypotable and reuse systems to improve efficiencyFor the Northwest service area two central For the Northwest service area two central redundant sites were established for central control redundant sites were established for central control from two major water treatment plantsfrom two major water treatment plantsSystem architecture utilizes a variety of com links System architecture utilizes a variety of com links -- high speed PVC phone circuits, spread spectrum high speed PVC phone circuits, spread spectrum radio, dialradio, dial--up cell phone up cell phone Control system configured as a WAN with Control system configured as a WAN with Ethernet LAN segments at major facilitiesEthernet LAN segments at major facilities

RTMC RTMC System System MonitoringMonitoringand Control and Control ArchitectureArchitecture

County Wide WAN(Fawn Ridge Node)

Fawn RidgeWTP Server

Lake ParkWTP Server

ManorsUser

Phone 13 Phone 1 Phone 12 EaglesUser

River OaksEPS Source

Histo

rical

Phon

e 2

Phon

e 3

Fiber

5

Phon

e 4

Phon

e 5

NorthwestRegional RPS

Source

RiverOaks RPS

Source

Van Dyke RPS Source

DaleMabry RPS

Source

Radio 14

Radio 15

Radio 16

Radio 17

Radio 18

North Lakes RPS

Source

NorthdaleRPS

Source

(Repumped)

(Repumped)

NorthdaleGolf Course

User

CarrollwoodGolf Course

User

Radio 9

Old Memorial

User

Repeater

Radio 10

WestchaseGolf Course

User

Radio 11

Phon

e 6

Cell Phone 7

Cell Phone 8WestchaseWest User

WestchaseEast User

Abbreviations:Abbreviations:EPS = Effluent Pump StationEPS = Effluent Pump StationRPS = Reclaimed Pump StationRPS = Reclaimed Pump StationWAN = Wide Area NetworkWAN = Wide Area NetworkWTP = Water Treatment PlantWTP = Water Treatment Plant

General Notes:General Notes:All Radio Links Spread SpectrumAll Radio Links Spread Spectrum

NW Reclaimed Water RTMC NW Reclaimed Water RTMC WAN Block DiagramWAN Block Diagram

RTMC System Network CommunicationsRTMC System Network Communications

Key Operational Features and BenefitsKey Operational Features and BenefitsCentral monitoring and control possible from Central monitoring and control possible from two redundant sitestwo redundant sitesWater plant monitoring and control utilizes the Water plant monitoring and control utilizes the same software packages and screen systemssame software packages and screen systemsCounty reclaimed management and planning County reclaimed management and planning staff ability to remotely access real time staff ability to remotely access real time system operation through RAS connectionssystem operation through RAS connectionsHistorical data base being developed along Historical data base being developed along with potable water and reclaimed water reports with potable water and reclaimed water reports systemsystem

NW Reclaimed Water Overview Screen

Typical Pumping Station Screen

Remote Station Control Panel CPRemote Station Control Panel CP--2 2

System StartSystem Start--up Lessons Learnedup Lessons Learned

New linked regional system resulted in New linked regional system resulted in seasonally varying hydraulic conditionsseasonally varying hydraulic conditionsHigh speed phone line coordination High speed phone line coordination critical when working with 21st century critical when working with 21st century telecom providerstelecom providersPLC/field wiring PLC/field wiring -- check and double check and double checkcheckWorking as a team Working as a team -- issues do not issues do not become problemsbecome problems

Northwest Hillsborough County Northwest Hillsborough County Reclaimed Water SystemReclaimed Water System

Presented at thePresented at theSpring 2002 Quarterly Spring 2002 Quarterly Reuse Coordinating Reuse Coordinating Committee MeetingCommittee Meeting

Presented by:Presented by:Ed FoxEd FoxNick Nick LoPrestiLoPrestiBob HendersonBob HendersonMike LehighMike LehighMark McNealMark McNeal

Hillsborough CountyHillsborough CountyDale Mabry AWTPDale Mabry AWTPTampa, FLTampa, FL

May 15, 2002May 15, 2002