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

NTMWD BOARD MEETINGJanuary 24, 2019

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

America"I pledge allegiance to the Flag of 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, one and indivisible."

CLICK TO EDIT MASTER TITLE STYLE2018 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

CLICK TO EDIT MASTER TITLE STYLEOVERVIEW 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 citydistribution 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

observation of odors

Purpose & IntroductionsDeveloped 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

Purpose & IntroductionsGAC 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

Purpose & IntroductionsSummary of data review:

• Some chemical doses at the plant varied, butfinished water quality in 2018 was comparableto previous years

• Chlorine residuals leaving Wylie WTP werevery similar to previous years, but slightlyhigher residuals were noted in some deliveryreservoirs

• Rainfall event at beginning of maintenanceperiod temporarily reduced demand

• Difference between free and total residualchlorine indicates probable speciation, whichcan impact taste and odor

• Findings consistent with TCEQ report

2018 MAINTENANCE PERIOD DATA REVIEW

Purpose & Introductions2018 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 occur

CLICK TO EDIT MASTER TITLE STYLE2019 FREE CHLORINE LOOK AHEAD

NTMWD is working in coordination with cities to minimize taste andodor, and provide additional information to the public:

• Have incorporated information from studies into new PR materials

• Conducting additional water quality monitoring, providing technicalresources and coordinating operations with cities:

- Best practices document

- Minimizing system storage volumes

- Monitoring free chlorine transition front

- Additional disinfection byproduct sampling

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

Best Practices Suggestion – Minimize System Storage Volumes

Meet system demands and emergency fire flows.

Minimizing storage volumes helps mitigate the formation of odorous 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

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

CLICK TO EDIT MASTER TITLE STYLETRANSMISSION 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

CLICK TO EDIT MASTER TITLE STYLECOMMUNICATIONS 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

CLICK TO EDIT MASTER TITLE STYLECOMMUNICATIONS 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

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.

BOARD OF DIRECTORS – DISCUSSION ITEM