NTMWD BOARD MEETING January 24, 2019 The Pledge of Allegiance to - - PowerPoint PPT Presentation

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NTMWD BOARD MEETING January 24, 2019 The Pledge of Allegiance to - - PowerPoint PPT Presentation

Jul 26, 2023 215 likes •690 views

Regional Service Through Unity Meeting our Regions Needs Today and Tomorrow NTMWD BOARD MEETING January 24, 2019 The Pledge of Allegiance to the Flag of the United States of America "I pledge allegiance to the Flag of the United

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Regional Service Through Unity… Meeting our Region’s Needs Today and Tomorrow

NTMWD BOARD MEETING

January 24, 2019

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The Pledge of Allegiance to the Flag of the United States of America

"I pledge allegiance to the Flag

  • f the United States of America,

and to the Republic for which it stands, one Nation under God, indivisible, with liberty and justice for all."

The Pledge of Allegiance to the Texas State Flag

"Honor the Texas flag; I pledge allegiance to thee, Texas, one state under God,

  • ne and indivisible."
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CLICK TO EDIT MASTER TITLE STYLE 2018 FREE CHLORINE MAINTENANCE PERIOD EXPERIENCE 2018 free chlorine maintenance period generated more interest than ever before

  • Coordinated with members/customers as in previous years
  • Continued pushing proactive monthly water quality information to

NTMWD webpage as in prior years

  • Pushed early public notices to internet/members & customers/media
  • Significant interest generated by activist group spurring formation of

local interest group

  • NTMWD responded swiftly to questions raised by and in the public
  • Anticipate some questions will surface again in 2019
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CLICK TO EDIT MASTER TITLE STYLE OVERVIEW OF RECENT WATER QUALITY EVENTS

TCEQ Investigation and Findings

  • Received 281 citizen complaints during March 2018
  • Taste and odor
  • Irritation of skin, eyes, nose, etc.
  • Respiratory and gastrointestinal issues
  • TCEQ collected 117 water quality samples in NTMWD and city

distribution systems during March

  • Results of investigation received in May 2018:
  • NTMWD had no violations
  • Chlorine and ammonia concentrations measured in water quality

samples not expected to cause adverse health effects

  • Chlorine and chloramine concentrations may have contributed to
  • bservation of odors
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Purpose & Introductions

Developed three scopes of work:

  • CDM Smith

― Water quality data review (2015-2018) ― Comprehensive look at transmission system quality program

  • Carollo

― BAF implementation schedule and outcomes ― Technical feasibility and costs of GAC

  • FNI

― Water quality sampling program ― Supplemental disinfection feasibility and costs ― Best practices document for cities (Please refer to Ad Memo No. 5186, 5187, 5188)

EVALUATIONS AND STUDIES

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Purpose & Introductions

GAC Analysis:

  • Full filter conversion is not feasible
  • Implementing post filtration contactors would

likely result in 35-45% increase in water rates

BAF Analysis:

  • Identified potential for phasing-in BAF at

Plants III and IV

  • However, it is not possible to significantly

accelerate conversion to BAF

Enhanced Sampling & Residual Adjustment Analysis:

  • Potential for additional online monitoring in

transmission system

  • Recommended maintaining current

chloramine operations

SUMMARY OF KEY FINDINGS

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Purpose & Introductions

Summary of data review:

  • Some chemical doses at the plant varied, but

finished water quality in 2018 was comparable to previous years

  • Chlorine residuals leaving Wylie WTP were

very similar to previous years, but slightly higher residuals were noted in some delivery reservoirs

  • Rainfall event at beginning of maintenance

period temporarily reduced demand

  • Difference between free and total residual

chlorine indicates probable speciation, which can impact taste and odor

  • Findings consistent with TCEQ report

2018 MAINTENANCE PERIOD DATA REVIEW

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Purpose & Introductions

2018 MAINTENANCE PERIOD DATA REVIEW Theory regarding 2018 free chlorine maintenance period complaints

  • Breakpoint chlorination resulting

in the formation of dichloramine and trichloramine species

  • Di- and trichloramine can

create taste and odor issues at low levels

  • The interface of the free

chlorine and chloraminated waters is where the highest potential for speciation and resultant taste/odor issues

  • ccur
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CLICK TO EDIT MASTER TITLE STYLE 2019 FREE CHLORINE LOOK AHEAD NTMWD is working in coordination with cities to minimize taste and

  • dor, and provide additional information to the public:
  • Have incorporated information from studies into new PR materials
  • Conducting additional water quality monitoring, providing technical

resources and coordinating operations with cities:

  • Best practices document
  • Minimizing system storage volumes
  • Monitoring free chlorine transition front
  • Additional disinfection byproduct sampling
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Best Practices During The Temporary Change In Disinfectant

NTMWD BMP Activities

  • Move the transition interface

through the system quickly

  • Reduce Wylie Complex

storage

  • Suggest temporarily operating

tank levels at the low levels as appropriate to meet system capacities

– Will want verification from cities to do this

  • Aggressively cycle tanks as

appropriate

  • Monitor disinfectant transition

in transmission system

Customer Activity Suggestions

  • Follow best practices guide
  • Move the disinfectant transition

through quickly

– Modify tank levels as appropriate in your distribution system to reduce storage – Cycle tanks aggressively – Flushing activities to assist in moving water

  • Monitor the disinfectant transition in

your system

– Measure Total, Free and Mono chloramine with field kits

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Best Practices Suggestion – Minimize System Storage Volumes Meet system demands and emergency fire flows.

Minimizing storage volumes helps mitigate the formation of

  • dorous di- and trichloramines

Wylie Complex:

  • Minimize storage

volumes in clearwells

  • Low level operation results

in 12 MG reduction Transmission System:

  • Coordinate with cities to

temporarily reduce storage volumes at delivery points

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TRANSMISSION SYSTEM MONITORING Temporary Change in Disinfectant Track free chlorine front:

  • 11 locations will be monitored for

the first week of conversion

  • Total chlorine, free chlorine,

monochloramine

  • Use hydraulic water age model in

conjunction with sampling data to coordinate with cities

  • Email sent 2x daily

Storage Tank

  • Avg. Water

Age (Days)

Wylie WTPs <1 East Fork #2 <1 Rockwall #1 <1 Shiloh 1-3 Plano #2 1-3 McKinney #1 1-3 Garland # 4 1-3 Farmersville 1-3 McKinney/Frisco PS 1-3 Princeton #1 3-5 Forney #1 7

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CLICK TO EDIT MASTER TITLE STYLE TRANSMISSION SYSTEM MONITORING

  • Began collecting monthly disinfection

byproduct data in late 2018 and will sample during temporary change

  • Working to enhance ability to monitor

water quality in the transmission system by installing online water quality instrumentation:

  • Currently have 6 instruments online measuring total

chlorine every 5 minutes

  • Another 16 instruments capable of monitoring chlorine

and ammonia will be installed by early 2020

  • Additional online instruments identified as part of FNI

recommendations for enhanced water quality monitoring

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CLICK TO EDIT MASTER TITLE STYLE COMMUNICATIONS TIMELINE

Date Activity

  • Jan. 16

Review with city communicators, receive final feedback

  • Jan. 21

New web pages on NTMWD.com with updated messages, materials posted online

  • Jan. 24

Communicate plans, provide packet of materials to Board of Directors

  • Jan. 28

Tom to present info to Member City Managers at monthly breakfast

(provide packets and extra copies of fact sheets for Council members)

  • Jan. 31

News release for 30-day notice requirement Week of Feb. 4 Media briefings for local community newspapers

  • Feb. 5 (1:30 pm)

Tour/briefing for County Health agency reps (asking to inform health providers) Notify local legislative staff Include notification and link to online info in News Stream eNewsletter Cities arm utility billing specialists/call center reps with info

Communications for Temporary Change in Disinfectant, March 4 – April 1

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CLICK TO EDIT MASTER TITLE STYLE COMMUNICATIONS TIMELINE

Date Activity

  • Feb. 15

Water Treatment Plant tour, briefing for city officials (focus on water quality) –

PLEASE HELP ENCOURAGE PARTICIPATION even if they’ve been before

  • Feb. 25

Second news advisory reminder – one week before start March (ongoing) Post test results online for chlorine levels: daily average from plant, weekly delivery points, plus DBP monthly data (starting with last December) Respond to emails, calls, social media comments, media questions (asking

for city assistance)

Third-party support: – TCEQ report from last year posted online – TCU Professor Becky Johnson (confirm, support process) – County Health Agency Reps (for medical questions) – Toxicologist Dr. Scott Phillips (videos addressing common medical concerns)

Communications for Temporary Change in Disinfectant, March 4 – April 1

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EXECUTIVE SESSION: DELIBERATION REGARDING REAL PROPERTY Section 551.072, Deliberation Regarding Real Property

  • Authorizes a government body to deliberate in Executive Session on

certain matters concerning real property.

  • It provides as follows:
  • A governmental body may conduct a closed meeting to deliberate

the purchase, exchange, lease, or value of real property if deliberation in an open meeting would have a detrimental effect on the position of the governmental body in negotiations with a third person.

  • Items discussed during consultation with the District’s attorney are

privileged and should remain confidential.

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BOARD OF DIRECTORS – DISCUSSION ITEM

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