Pinellas County Water System Resiliency...

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Pinellas County Water System Resiliency Enhancement

Setting the Standard for

Public Service in America

Improving Quality of Life

Steve Soltau, MBAPinellas County Utilities [email protected]

Christopher Baggett, PEJones Edmunds & Associates, [email protected]

http://www.pinellascounty.org/utilities/default.htm



Outline

• Keller WTP Obsolete

• Flushing Increased• Nitrification

• Improvements Through

Modeling

• Collaborate Operations

Staff

• Use Model to be

Resilient

• Return on Investment

• Actual Savings


Drinking Water System

Pinellas County

• Population:

700,000+

• 2,000+ Miles

of Piping

• 6 Pumping

Stations

• 9 Ground

Storage Tanks

• 1 Standpipe


Drinking Water System

Before 2002 After 2002

Water Source Groundwater Groundwater

Surface Water,

Desalinated Water

Distribution

Residual Free Chlorine Chloramines


Drinking Water System(Before 2002)

Groundwater

Keller and NBPS

Average Hydraulic

Interface


Drinking Water System(After 2002)

Groundwater

Regional Blend

Water Quality

Interface

Keller and NBPS

Average Hydraulic Interface

Regional Blend


Nitrification and Impact on Water Quality

Loss of chlorine residuals

Release of free ammonia

Nitrite/Nitrate Production

Ammonia

Nitrite

Nitrate

Decreased pH & DO

Increased microbiological activity


Flushing Before Improvements

Annual Free

Chlorine Maintenance

Chloramine

Conversion

Unidirectional Flushing

(Conversion Prep)


Nitrification Control Study and Strategy

• Evaluate Historical Water Quality Data

• Hydraulic Model Update

• Water Quality Modeling

Scope

• Short / Long-term System Improvements

• Better Control of Nitrification

• Reduce System Flushing

Goals


Short-Term Improvements

Recommended System Improvements

1. Combine Keller WTP Finished Water with TBW Regional Water

2. Redirect Water Flow in Northern System

3. Install Active Mixers in GSTs

4. Remove Oakhurst Pump Station From Service

5. Perform Chlorine Maintenance Events Twice a Year

6. Perform Localized Unidirectional Flushing


Recommended System Improvements

1. Add Re-Circulation Station in Crystal Beach Area

2. Add Re-Circulation Station in North Beach Area

3. Provide TRC Boosting in North Beach Area

4. Provide TRC Boosting at Capri Isle Pump Station

5. Provide TRC Boosting at Gulf Beach Pump Station and Oakhurst Bypass

Long-Term Improvements


Estimated Return on Investment

ProjectsProject

Cost

ROI

(years)

Combine Keller WTP Finished Water with

TBW Regional Water$10M 20

Redirect Flow in Northern System $2M <5

Install Active Mixers in GSTs $0.4M <5

Provide TRC Boosting at Capri Isle Pump

Station$0.12M <3

Provide TRC Boosting at Gulf Beach Pump

Station and Oakhurst Bypass$0.23M <2

Hydraulic Re-Circulation, Additional TRC

Boosting$1.1M <10


What is Resiliency?

Bounce Back Rapidly

Ability to:

Limit Impacts

Anticipate Risks

Source: Community and Regional Resiliency Institute


System Performance Function

Source: EPA 600/R-14/383, January 2015

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Recovered State

Re~ilience Action

time


Hazards and Impacts

Potential Hazards

• Natural Disasters

• Terrorist Attacks

• Cyber Attacks

• Hazardous Materials Release

• Climate Change

Potential Impacts

• Pipe Breaks/Outages)

• Other Infrastructure Issues

• Power Outages

• Service Disruptions

• Pressure Loss

• Water Quality Changes

• Social Impacts

• Financial Impacts



Hazards and Impacts

Potential Hazards

• Natural Disasters

• Terrorist Attacks

• Cyber Attacks

• Hazardous Materials Release

• Climate Change

• Infrastructure Condition

• Accidents

Potential Impacts

• Pipe Breaks/Outages)

• Other Infrastructure Issues

• Power Outages

• Service Disruptions

• Pressure Loss

• Water Quality Changes

• Social Impacts

• Financial Impacts


Infrastructure ConditionAccidents


Resiliency Enhancement Cycle


Preparedness & Mitigation

Event

Response & Recover

Lessons Learned & Adaptation


Resiliency

Bounce Back Rapidly

Ability to:

Limit Impacts

Anticipate Risks



Pre-Event Mitigation Planning


• Water Transmission Main Disruptions

• Major Water Supply Facility Outages

Events

• Develop List of Events

• Model Events

• Develop Recommendations

• Operational

• Infrastructure

• Implement

Activities


Original Configuration(Schematic)

Eldridge Wilde

Wellfield

Regional

Supply

H2S Treatment

NBPS

Southern PCU

WS

Northern PCU

WS

Keller WTP

HSPS 2

Wholesale

Customers

Owned by TBW

Owned by PCU

Regional

TreatmentHSPS 1


New Configuration(Normal Mode)

Eldridge Wilde

Wellfield

Regional

Supply

H2S Treatment

Regional

Treatment

NBPS

Southern PCU

WS

Northern PCU

WS

Keller WTP

Wholesale

Customers

Owned by TBW

Owned by PCU

HSPS


New Configuration(Limited Regional Supply)

Eldridge Wilde

Wellfield

Regional

Supply

H2S Treatment

Regional

Treatment

NBPS

Southern PCU

WS

Northern PCU

WS

Keller WTP

Wholesale

Customers

Owned by TBW

Owned by PCU

HSPS


New Configuration(Low Pressure Northern System)

Eldridge Wilde

Wellfield

Regional

Supply

H2S Treatment

Regional

Treatment

NBPS

Southern PCU

WS

Northern PCU

WS

Keller WTP

Wholesale

Customers

Owned by TBW

Owned by PCU

HSPS


New Configuration(Regional Outage)

Eldridge Wilde

Wellfield

Regional

Supply

H2S Treatment

Regional

Treatment

NBPS

Southern PCU

WS

Northern PCU

WS

Keller WTP

Wholesale

Customers

Owned by TBW

Owned by PCU

HSPS


New Configuration(Keller WTP Outage)

Eldridge Wilde

Wellfield

Regional

Supply

H2S Treatment

Regional

Treatment

NBPS

Southern PCU

WS

Northern PCU

WS

Keller WTP

Wholesale

Customers

Owned by TBW

Owned by PCU

HSPS


New Configuration(North Booster Pump Station Outage)

Eldridge Wilde

Wellfield

Regional

Supply

H2S Treatment

Regional

Treatment

NBPS

Southern PCU

WS

Northern PCU

WS

Keller WTP

Wholesale

Customers

Owned by TBW

Owned by PCU

HSPS


New Configuration(Revert to Historical Configuration)

Eldridge Wilde

Wellfield

Regional

Supply

H2S Treatment

Regional

Treatment

NBPS

Southern PCU

WS

Northern PCU

WS

Keller WTP

Wholesale

Customers

Owned by TBW

Owned by PCU

HSPS


What is Resiliency?

Bounce Back Rapidly

Ability to:

Limit Impacts

Anticipate Risks



Event Response Plan

• Facility Outage/Large Main Break

Event

• Monitor Pressures and Flows

• Call Center (24/7)

Notification

• Water System Adjustments

• Valving

• Operations

• First Response Repair Crews

• Implement First Response SOPs

• PCU Notifies Customers

• Additional Modeling As Needed

Response


Event Response

• Water Quality

Event

• ~180 Monitoring Locations

• 8 Real Time SCADA

• Call Center (24/7)

Notification

• Chemical Dosing Adjustments

• First Response Water Quality Crews

• Implement First Response SOPs

• Directional Flushing EGIS



Response


Event Response Plan

• Hurricanes

Event

• County Emergency Management

• Weather Service

Notification

• Implement Emergency Response SOPs

• Water System Adjustments

• Valving

• Operations



Response


Before Short Term Improvements 1 and 2

Groundwater

Regional Blend

Water Quality

Interface

Keller and NBPS

Average Hydraulic Interface

Regional Blend

BEFORE


After Short Term Improvements 1 and 2

AFTER


COLD

WARM

Active Mixing

UNIFORM

TEMPERATURE AND

WATER QUALITY

Passive Mixing

(Inadequate Through-Flow)

Short Term Improvement 3

BEFORE AFTER



AFTERBEFORE



Developed Action Levels

TRC monitor for nitrification

Nitrite as primary indicator

of nitrification

Driver to take action

1. TRC > 3.5 mg/L

2. TRC < 3.0 mg/L

3. If Nitrite is < 0.025 mg/L

4. If Nitrite is ≥ 0.025 mg/L


Benefits So Far

(Energy Reduction KwH used)


Benefits So Far

(Energy Efficiency KwH per MG)


Benefits So Far

(Energy Cost Savings)


Benefits So Far

(Flushing Reduction)

Annual Free

Chlorine MaintenanceChloramine Conversion


(Conversion Prep)


Benefits So Far

(Flushing Reduction)

Annual Free



(Conversion Prep)

Begin Short Term

Improvements Implementation


Benefits So Far

(Flushing Cost Savings)

Annual Free



(Conversion Prep)

Begin Short Term

Improvements Implementation

$1.1M/Yr.

Savings


Benefits So Far

(Water Quality Improvements)


Benefits So Far

(Fewer Customer Complaints)


Summary

• Keller WTP Obsolete

• Flushing Increased• Nitrification

• Improvements Through

Modeling

• Collaborate Operations

Staff

• Use Model to be

Resilient

• Return on Investment

• Actual Savings


Acknowledgements

Pinellas County Utilities

Laboratory, Plant Operations,

Systems Maintenance, and

Water Quality Division

Robert Powell, Pinellas County

Utilities, Director (Retired)

Kevin Becotte, PE, Pinellas

County Utilities, Director of

Utilities Engineering

Steven Duranceau, PhD, the

University of Central Florida


Questions


Pinellas County Water System Resiliency Enhancement

Setting the Standard for

Public Service in America

Improving Quality of Life

Steve Soltau, MBAPinellas County Utilities [email protected]

Christopher Baggett, PEJones Edmunds & Associates, [email protected]



Pinellas County Water System Resiliency...

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