02/15/2024 - Packet
WATER ADVISORY BOARD AGENDA – February 15, 2024
City of Tigard | 8777 SW Burnham St., Tigard, OR 97223 | 503-718-2688 | www.tigard-or.gov | Page 1 of 2
City of Tigard Water Advisory Board Agenda
SERVING TIGARD WATER SERVICE AREA
MEETING DATE: Thursday, February 15, 2024, 5:30 p.m.
MEETING LOCATION: 10 mil Conference Room - PW
Public Dial-in Number for listen-only phone bridge (971) 256-0577
When prompted enter Conference ID 13125
1. Call to Order, Roll Call, and Introductions
2. Approval of Minutes – December 13, 2023
Action: Motion to approve the December 13, 2023, minutes.
3. Introductions New Members – Brian Rager
4. Discussion Regarding Past Meetings & Member Positions – Brian Rager
5. Public Comments
Call for comments from the public.
6. Water Supply Update – Brian Rager
7. Non-Agenda Items
Call for non-agenda items from the board.
8. Next Meeting
April 10, 2024
Location: 10 mil PW
Time: 5:30 pm
WATER ADVISORY BOARD AGENDA – February 15, 2024
City of Tigard | 8777 SW Burnham St., Tigard, OR 97223 | 503-718-2688 | www.tigard-or.gov | Page 2 of 2
The City of Tigard tries to make all reasonable modifications to ensure that people with disabilities have an equal
opportunity to participate in all city meetings.
Upon request, the city will do its best to arrange for the following services/equipment:
Assistive listening devices.
Qualified sign language interpreters.
Qualified bilingual interpreters.
Because the city may need to hire outside service providers or arrange for specialized equipment, those requesting
services/equipment should do so as far in advance as possible, but no later than 3 city workdays prior to the meeting.
To make a request, call 503-718-2591 (voice) or 503-684-2772 (TDD - Telecommunications Devices for the Deaf).
9. Adjournment
Action: Motion for adjournment.
Executive Session
The Water Advisory Board may go into Executive Session. If an Executive Session is called to order, the
appropriate ORS citation will be announced identifying the applicable statute. All discussions are confidential
and those present may disclose nothing from the Session. Representatives of the news media are allowed to
attend Executive Sessions, as provided by ORS 192.660(4), but must not disclose any information discussed.
No Executive Session may be held for the purpose of taking any final action or making any final decision.
Executive Sessions are closed to the public.
Water Advisory Board (WAB) Minutes
SERVING TIGARD WATER SERVICE AREA
Page 1 of 4
MEETING DATE: Thursday, February 15, 2024, 5:30 p.m.
MEETING LOCATION: 10 mil – Public Works
Members Present:
Commissioner Marie Walkiewicz TWD (Term ends 2027)
Commissioner Ken Henschel WAB At-Large Member (Term ends 12/31/2028)
Commissioner Joshua Drake City of Durham (Terms ends 2028)
Commissioner Michael Brewin WAB At-Large Member (Term ends 12/31/2028)
Members Absent:
Councilor Jeanette Shaw City of Tigard (Term ends 12/31/2025)
Members of the Public Present:
City of Tigard Staff Present:
Brian Rager Public Works Director
Shauna Large WAB Coordinator/Recorder
COT Guests:
1.Call to Order, Roll Call, and Introductions
Commissioner Ken Henschel called the meeting to order at 5:30 p.m.
2.Approval of Minutes – December 13, 2023
Due to a procedural error Brian Rager asked the WAB members to Amend the October 11,
2023, minutes to reflect Ken Henschel as a guest, not a commissioner at that meeting. Ken
Henschel motioned to amend the minutes; Joshua Drake seconded the motion. The motion
passed with a 4-0 vote, with Commissioners Ken Henschel, Marie Walkiewicz, Joshua
Drake, and Michael Brewin voting yes.
Amended
Water Advisory Board (WAB) Minutes
SERVING TIGARD WATER SERVICE AREA
Page 2 of 4
The board discussed making a change to the December minutes showing Ken Henschel as a
guest at that meeting. The board will vote on those minutes at the next meeting.
3. Introductions – Brian Rager
Introductions proceeded with each member and staff member stating their names, where
they work and some background information.
4. Discussion regarding past meetings and member positions – Brian Rager
Brian Rager asked the members to vote on a new chair since Keith Jehnke will no longer be
the WAB Chair. The board discussed the annual election of officers (Chair and Vice Chair).
Ken Henschel proposed electing the Vice Chair first, he stated he would like to be the Vice
Chair. Ken Henschel made the motion, Michael Brewin seconded the motion, and the
motion passed 4-0 with Commissioners Ken Henschel, Marie Walkiewicz, Joshua Drake,
and Micheal Brewin voting yes. Then, Michel Brewin made a motion nominating Marie
Walkiewicz as Chair, and Joshua Drake seconded the motion, and the motion passed 4-0
with Commissioners Ken Henschel, Marie Walkiewicz, Joshua Drake, and Micheal Brewin
voting yes.
5. Public Comments
There were no Public Comments.
6. Water Supply Update – Brian Rager
Brian Rager briefly went over the December and January supply updates. In December and
January, the demand was quite high compared with other years. Michael Brewin noted the
turbidity goes up in January, it seems to be directly correlated to the precipitation, but the
stored water level went down with increased demand.
7. Non-Agenda Items
Marie Walkiewicz suggested that we choose a cut-off date for submitting Agenda items prior
to the next WAB meeting, which would be helpful. The decision was made to have all
Agenda items submitted three weeks prior to the next meeting. We want to give staff plenty
of time to prepare if asked to join one of our meetings unless something arises that is
considered an urgent matter.
Water Advisory Board (WAB) Minutes
SERVING TIGARD WATER SERVICE AREA
Page 3 of 4
Marie Walkiewicz asked if Shauna Large could create a spreadsheet tracker that would have
the agenda topics discussed during WAB meetings for future meeting discussions.
Marie Walkiewicz asked what the protocol was if there was a water emergency. Brian Rager
stated he wasn’t sure if there was an emergency procedure for Tigard Water but that there is
one for individual people. He mentioned that the Water District probably has a
responsibility in terms of communication.
Marie Walkiewicz Michael Brewin asked if sometime in May or June if there would be some
kind of annual water meter inspection. Are meter readers going around, particularly before
AMI kicks in, to take a casual look along the street to see who has a sprinkler system. Ken
Henschel he stated, there are so many that are unreported. Ken Henschel Michael Brewin
also stated there are some residents that have people installing them that aren’t registered
contractors, landscapers, or inspectors. There seems to be an issue with people not doing the
practical tests and not following the procedures correctly. Brian Rager stated he would chat
with Eric about the meter readers and what else they can do out there. Brian Rager
mentioned he could have one of the water supervisors come in and talk about this in a
future meeting.
It was suggested that we have a water conservation person talk to WAB about what
programs are available. Brian Rager stated that our water quality testing employee is Jennifer
Joe. We could have the water conservation person come to a future WAB meeting.
Brian Rager mentioned he received a packet from Epic Land Solutions regarding ODOT’’s
project on Hall Blvd. They are building wheelchair ramps at various locations. They need a
piece of our corner out here to provide that. There is a shared interest with Tigard, Durham
and the Tigard Water District so please watch out for that paperwork. They will need
signatures from all three parties.
Brian Rager informed the WAB that we have been looking for property for the new Public
Works and Police facility. We recently signed a purchase/sale agreement for 9.5 acres here
in Tigard over on Hunziker.
Water Advisory Board (WAB) Minutes
SERVING TIGARD WATER SERVICE AREA
Page 4 of 4
8.Next Meeting
June 12, 2024
Location: 10 mil – PW
Time: 5:30 pm
9.Adjournment
At 6:49 p.m., Commissioner Michael Brewin moved to adjourn the meeting, and
Commissioner Joshua Drake seconded the motion. The meeting adjourned by unanimous
vote of the commissioners present, with Commissioners Marie Walkiewicz, Ken Henschel,
Joshua Drake, and Michael Brewin voting yes.
____________________________ ____________________________
Marie Walkiewicz, WAB Chair Shauna Large, WAB Coordinator/Recorder
Date: _______________________ Date: ________________________ 4/24/2024
Water Advisory Board Water Supply Update
December 2023 Update
Tigard Usage
Current
(Dec 23)
Prior Yr
(Dec 22)
Avg Daily Use (MGD)4.43 4.52
Avg Temp 52°43°
Peak Use (MGD)4.70 5.92
Peak Temp 67°55°
Tigard Storage
Stored Water (ASR)324.1 317.6
Days of Supply 179.4 173.6
4.43
Average
4.08
0
2
4
6
8
10
Average Daily Demand (ADD)
December Usage
Average daily water use for the month of December was
4.43 million gallons per day (mgd). Peak daily use was 4.7
mgd. Last year, average daily water use was 4.52 mgd for the
same time period, with a peak day of 5.92 mgd. The average
daily and peak use for December were above the historic
averages of 4.08 mgd and 4.56 mgd respectively.
4.7Peak 4.56
0
2
4
6
8
10
Peak Daily Demand (PDD)
The chart above shows Tigard's average daily water use and peak use for the current fiscal year (YTD), as well as
two years prior. This usage is compared to the average and peak air temperatures during that time, displayed as
the shaded areas. The bar chart is displaying precipitation in inches (using left axis). The chart is intended to
display the seasonality of water usage and the close relationship with weather patterns.
0
20
40
60
80
100
120
0
2
4
6
8
10
12
14
Jul 2021Aug 2021Sep 2021Oct 2021Nov 2021Dec 2021Jan 2022Feb 2022Mar 2022Apr 2022May 2022Jun 2022Jul 2022Aug 2022Sep 2022Oct 2022Nov 2022Dec 2022Jan 2023Feb 2023Mar 2023Apr 2023May 2023Jun 2023Jul 2023Aug 2023Sep 2023Oct 2023Nov 2023Dec 2023TemperatureMillion Gallons Per Day (MGD)Tigard Water Usage Compared to Air Temperature and Precipitation
Peak Temperature Average Temperature Precipitation (In)Average Daily Use (MGD)Peak Use (MGD)
Water Advisory Board Water Supply Update
Stored Water (ASR)
Lake Oswego-Tigard Water Treatment Plant & Bonita Pump Station
Data Metrics
Current
(Dec 23)
Prior Yr
(Dec 22)
Chlorine Residual 1.14 1.14
Alkalinity 21.90 22.20
pH 7.77 7.80
Temperature 8.06 6.06
0
50
100
150
200
250
0
50
100
150
200
250
300
350
400
Jan
2021
Mar
2021
May
2021
Jul
2021
Sep
2021
Nov
2021
Jan
2022
Mar
2022
May
2022
Jul
2022
Sep
2022
Nov
2022
Jan
2023
Mar
2023
May
2023
Jul
2023
Sep
2023
Nov
2023 Days of SupplyStored Water (MG)Stored Water (ASR)
ASR #1 ASR #2 Days of Supply
The chart above shows Tigard's current stored water (ASR levels) as well as 12 months of prior histoy.
The storage levels of ASR #1 and ASR #2 are stacked to show total combined stored water. The days
of supply, based on the amount of stored water, is displayed on the right axis and as the gray line.
0
0.5
1
1.5
2
2.5
3
3.5
4
Chlorine Residual (0.2-4.0ppm boundary)Chlorine Residual: 1.14 ppm
Chlorine is a disinfectant used to
protect the public from virus,
bacteria, and other micro-
organisms. The maximum level
for chlorine in drinking water is 4
ppm and the minimum level
required is 0.2 ppm (indicated by
the yellow shaded area in the
chart above). The average
chlorine residual from July 2020
to current is 1.10 ppm.
Definitions:
LOTWTP: Lake Oswego-Tigard Water Treatment Plant
mg/L: millograms per liter, also expressed as ppm
ppm: parts per million, a measurement of the mass of a
chemical per unit volume of water.
cfs: cubic feet per second, measurement of rate of flow
Water Advisory Board Water Supply Update
0
10
20
30
40
50
60
70 Finished Water Alkalinity (ppm)
4
5
6
7
8
9
10
pH (Raw & Finished)
Clackamas River pH Bonita pH Neutral
0
5
10
15
20
25
Water Temperature C (Raw & Finished)
Clackamas River LOTWTP
Alkalinity: 21.9 ppm
Alkalinity is water's capacity
(buffering) to resist acidic
changes in pH or to neutralize
acid. A normal range for
alkalinity in finished drinking
water is 20-200 mg/L (indicated
by the blue shaded area). The
EPA Secondary Drinking Water
Regulations limit alkalinity only
in terms of total dissolved solids
not to exceed 500ppm.
pH: 7.77
pH is a numerical measure of
the acidity or alkalinity (base) of
a solution, measured on a scale
of 0 to 14. Neutral on the scale
is 7 (indicatd by the gray line in
the chart), below 7 is acidic and
above 7 is alkaline. For drinking
water, slighly base chemistry
(alkaline) provides anti-
corrosion properties to protect
water supply plumbing and
reduces the risks associated
with lead solder and copper
plumbing.
Water Temperature: 8.06C
(46F)
While water temperature can
have a major influence on
biological activity and organic
life in bodies of water, there is
not an EPA standard for the
temperature of finished
drinking water.
As you can see in the chart
above, the temperature of the
finished drinking water
fluctuates in tandem with the
temperature of the source water
(Clackamas River).
Water Advisory Board Water Supply Update
USGS Clackamas River Water Data
The following charts contain U.S. Geological Survey data collected from the Clackamas River. The charts on this
page show a comparison of the current month of data to that same month in the prior years, as well as an average
over those years. On the second page, those charts show the historical trends of each metric from January 2014
to current. Turbidity, a metric not yet defined in this report, is the relative clarity of a liquid. It is an optical
characteristic, measuring the amount of light scattered by material in the water, measured in nephelometric
turbidity units (NTU).
6.9Average
5.7
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Temperature for Current Month
5960.6Average
5133.9
0
2,000
4,000
6,000
8,000
10,000
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Flow for Current Month
7.3
Average
7.3
6.6
6.8
7.0
7.2
7.4
7.6
7.8
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
pH for Current Month
5.7
Average
5.7
0.0
5.0
10.0
15.0
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Turbidity for Current Month
Water Advisory Board Water Supply Update
0
2
4
6
8
10
12
14
16
18
20
Jan
2014
Jul
2014
Jan
2015
Jul
2015
Jan
2016
Jul
2016
Jan
2017
Jul
2017
Jan
2018
Jul
2018
Jan
2019
Jul
2019
Jan
2020
Jul
2020
Jan
2021
Jul
2021
Jan
2022
Jul
2022
Jan
2023
Jul
2023
Jan
2024
Turbidity of Clackamas River (NTUs)
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
Jan
2014
Jul
2014
Jan
2015
Jul
2015
Jan
2016
Jul
2016
Jan
2017
Jul
2017
Jan
2018
Jul
2018
Jan
2019
Jul
2019
Jan
2020
Jul
2020
Jan
2021
Jul
2021
Jan
2022
Jul
2022
Jan
2023
Jul
2023
Jan
2024
pH of Clackamas River
0
2,000
4,000
6,000
8,000
10,000
12,000
Jan
2014
Jul
2014
Jan
2015
Jul
2015
Jan
2016
Jul
2016
Jan
2017
Jul
2017
Jan
2018
Jul
2018
Jan
2019
Jul
2019
Jan
2020
Jul
2020
Jan
2021
Jul
2021
Jan
2022
Jul
2022
Jan
2023
Jul
2023
Jan
2024
Discharge (Flow) of Clackamas River (cfs)
0
5
10
15
20
25
Jan
2014
Jul
2014
Jan
2015
Jul
2015
Jan
2016
Jul
2016
Jan
2017
Jul
2017
Jan
2018
Jul
2018
Jan
2019
Jul
2019
Jan
2020
Jul
2020
Jan
2021
Jul
2021
Jan
2022
Jul
2022
Jan
2023
Jul
2023
Jan
2024
Temperature of Clackamas River (c)
Water Advisory Board Water Supply Update
January 2024 Update
Tigard Usage
Current
(Jan 24)
Prior Yr
(Jan 23)
Avg Daily Use (MGD)4.79 4.38
Avg Temp 45°48°
Peak Use (MGD)6.24 4.74
Peak Temp 58°54°
Tigard Storage
Stored Water (ASR)305.0 319.3
Days of Supply 168.5 177.5
Average
4.06 4.79
0
2
4
6
8
10
Average Daily Demand (ADD)
January Usage
Average daily water use for the month of January was 4.79
million gallons per day (mgd). Peak daily use was 6.24 mgd.
Last year, average daily water use was 4.38 mgd for the same
time period, with a peak day of 4.74 mgd. The average daily
and peak use for January were above the historic averages of
4.06 mgd and 4.43 mgd respectively.
6.24
Peak 4.43
0
2
4
6
8
10
Peak Daily Demand (PDD)
The chart above shows Tigard's average daily water use and peak use for the current fiscal year (YTD), as well as
two years prior. This usage is compared to the average and peak air temperatures during that time, displayed as
the shaded areas. The bar chart is displaying precipitation in inches (using left axis). The chart is intended to
display the seasonality of water usage and the close relationship with weather patterns.
0
20
40
60
80
100
120
0
2
4
6
8
10
12
14
Jul 2021Aug 2021Sep 2021Oct 2021Nov 2021Dec 2021Jan 2022Feb 2022Mar 2022Apr 2022May 2022Jun 2022Jul 2022Aug 2022Sep 2022Oct 2022Nov 2022Dec 2022Jan 2023Feb 2023Mar 2023Apr 2023May 2023Jun 2023Jul 2023Aug 2023Sep 2023Oct 2023Nov 2023Dec 2023Jan 2024TemperatureMillion Gallons Per Day (MGD)Tigard Water Usage Compared to Air Temperature and Precipitation
Peak Temperature Average Temperature Precipitation (In)Average Daily Use (MGD)Peak Use (MGD)
Water Advisory Board Water Supply Update
Stored Water (ASR)
Lake Oswego-Tigard Water Treatment Plant & Bonita Pump Station
Data Metrics
Current
(Jan 24)
Prior Yr
(Jan 23)
Chlorine Residual 1.14 1.15
Alkalinity 20.91 22.42
pH 7.79 7.81
Temperature 6.73 7.01
0
50
100
150
200
250
0
50
100
150
200
250
300
350
400
Jan
2021
Mar
2021
May
2021
Jul
2021
Sep
2021
Nov
2021
Jan
2022
Mar
2022
May
2022
Jul
2022
Sep
2022
Nov
2022
Jan
2023
Mar
2023
May
2023
Jul
2023
Sep
2023
Nov
2023
Jan
2024 Days of SupplyStored Water (MG)Stored Water (ASR)
ASR #1 ASR #2 Days of Supply
The chart above shows Tigard's current stored water (ASR levels) as well as 12 months of prior histoy.
The storage levels of ASR #1 and ASR #2 are stacked to show total combined stored water. The days
of supply, based on the amount of stored water, is displayed on the right axis and as the gray line.
0
0.5
1
1.5
2
2.5
3
3.5
4
Chlorine Residual (0.2-4.0ppm boundary)Chlorine Residual: 1.14 ppm
Chlorine is a disinfectant used to
protect the public from virus,
bacteria, and other micro-
organisms. The maximum level
for chlorine in drinking water is 4
ppm and the minimum level
required is 0.2 ppm (indicated by
the yellow shaded area in the
chart above). The average
chlorine residual from July 2020
to current is 1.10 ppm.
Definitions:
LOTWTP: Lake Oswego-Tigard Water Treatment Plant
mg/L: millograms per liter, also expressed as ppm
ppm: parts per million, a measurement of the mass of a
chemical per unit volume of water.
cfs: cubic feet per second, measurement of rate of flow
Water Advisory Board Water Supply Update
0
10
20
30
40
50
60
70 Finished Water Alkalinity (ppm)
4
5
6
7
8
9
10
pH (Raw & Finished)
Clackamas River pH Bonita pH Neutral
0
5
10
15
20
25
Water Temperature C (Raw & Finished)
Clackamas River LOTWTP
Alkalinity: 20.9 ppm
Alkalinity is water's capacity
(buffering) to resist acidic
changes in pH or to neutralize
acid. A normal range for
alkalinity in finished drinking
water is 20-200 mg/L (indicated
by the blue shaded area). The
EPA Secondary Drinking Water
Regulations limit alkalinity only
in terms of total dissolved solids
not to exceed 500ppm.
pH: 7.79
pH is a numerical measure of
the acidity or alkalinity (base) of
a solution, measured on a scale
of 0 to 14. Neutral on the scale
is 7 (indicatd by the gray line in
the chart), below 7 is acidic and
above 7 is alkaline. For drinking
water, slighly base chemistry
(alkaline) provides anti-
corrosion properties to protect
water supply plumbing and
reduces the risks associated
with lead solder and copper
plumbing.
Water Temperature: 6.73C
(44F)
While water temperature can
have a major influence on
biological activity and organic
life in bodies of water, there is
not an EPA standard for the
temperature of finished
drinking water.
As you can see in the chart
above, the temperature of the
finished drinking water
fluctuates in tandem with the
temperature of the source water
(Clackamas River).
Water Advisory Board Water Supply Update
USGS Clackamas River Water Data
The following charts contain U.S. Geological Survey data collected from the Clackamas River. The charts on this
page show a comparison of the current month of data to that same month in the prior years, as well as an average
over those years. On the second page, those charts show the historical trends of each metric from January 2014
to current. Turbidity, a metric not yet defined in this report, is the relative clarity of a liquid. It is an optical
characteristic, measuring the amount of light scattered by material in the water, measured in nephelometric
turbidity units (NTU).
5.5
Average
5.3
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Temperature for Current Month
8198.5
Average
5198.0
0
2,000
4,000
6,000
8,000
10,000
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Flow for Current Month
7.3
Average
7.3
6.8
6.9
7.0
7.1
7.2
7.3
7.4
7.5
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
pH for Current Month
7.4Average
5.5
0.0
2.0
4.0
6.0
8.0
10.0
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Turbidity for Current Month
Water Advisory Board Water Supply Update
0
2
4
6
8
10
12
14
16
18
20
Jan
2014
Jul
2014
Jan
2015
Jul
2015
Jan
2016
Jul
2016
Jan
2017
Jul
2017
Jan
2018
Jul
2018
Jan
2019
Jul
2019
Jan
2020
Jul
2020
Jan
2021
Jul
2021
Jan
2022
Jul
2022
Jan
2023
Jul
2023
Jan
2024
Turbidity of Clackamas River (NTUs)
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
Jan
2014
Jul
2014
Jan
2015
Jul
2015
Jan
2016
Jul
2016
Jan
2017
Jul
2017
Jan
2018
Jul
2018
Jan
2019
Jul
2019
Jan
2020
Jul
2020
Jan
2021
Jul
2021
Jan
2022
Jul
2022
Jan
2023
Jul
2023
Jan
2024
pH of Clackamas River
0
2,000
4,000
6,000
8,000
10,000
12,000
Jan
2014
Jul
2014
Jan
2015
Jul
2015
Jan
2016
Jul
2016
Jan
2017
Jul
2017
Jan
2018
Jul
2018
Jan
2019
Jul
2019
Jan
2020
Jul
2020
Jan
2021
Jul
2021
Jan
2022
Jul
2022
Jan
2023
Jul
2023
Jan
2024
Discharge (Flow) of Clackamas River (cfs)
0
5
10
15
20
25
Jan
2014
Jul
2014
Jan
2015
Jul
2015
Jan
2016
Jul
2016
Jan
2017
Jul
2017
Jan
2018
Jul
2018
Jan
2019
Jul
2019
Jan
2020
Jul
2020
Jan
2021
Jul
2021
Jan
2022
Jul
2022
Jan
2023
Jul
2023
Jan
2024
Temperature of Clackamas River (c)