02/08/2023 - Packet
WATER ADVISORY BOARD AGENDA – February 8, 2023
City of Tigard | 13125 SW Hall Blvd., Tigard, OR 97223 | 503-718-2591 | www.tigard-or.gov | Page 1 of 2
City of Tigard Water Advisory Board Agenda
SERVING TIGARD WATER SERVICE AREA
MEETING DATE: Wednesday, February 8, 2023, 5:30 p.m.
MEETING LOCATION: 10 mil Conference Room
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 14, 2022
Action: Motion to approve the December 14, 2022, minutes.
3. Public Comments
Call for comments from the public.
4. Water Supply Update –Sammy Rico
5. WAB Meetings – Brian Rager
6. Consider Dedication of Street Right-of-Way to the Public Across TL300 at Reservoir 4.
– Joe Wisniewski
7. Non-Agenda Items
Call for non-agenda items from the board.
8. Next Meeting
April 12, 2023
Location: 10 mil
Time: 5:30 pm
WATER ADVISORY BOARD AGENDA – February 8, 2023
City of Tigard | 13125 SW Hall Blvd., Tigard, OR 97223 | 503-718-2591 | 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 Water Supply Update
December 2022 Update
Tigard Usage
Current
(Dec 22)
Prior Yr
(Dec 21)
Avg Daily Use (MGD)4.52 4.39
Avg Temp 43°46°
Peak Use (MGD)5.92 4.67
Peak Temp 55°54°
Tigard Storage
Stored Water (ASR)317.6 115.3
Days of Supply 173.6 53.4
4.52Average
4.08
0
1
2
3
4
5
Average Daily Demand (ADD)
0
20
40
60
80
100
120
140
0
2
4
6
8
10
12
14
Jul 2020Aug 2020Sep 2020Oct 2020Nov 2020Dec 2020Jan 2021Feb 2021Mar 2021Apr 2021May 2021Jun 2021Jul 2021Aug 2021Sep 2021Oct 2021Nov 2021Dec 2021Jan 2022Feb 2022Mar 2022Apr 2022May 2022Jun 2022Jul 2022Aug 2022Sep 2022Oct 2022Nov 2022Dec 2022TemperatureMillion Gallons Per Day (MGD)Tigard Usage and Air Temperature Over Time
Peak Temperature Average Temperature Average Daily Use (MGD)Peak Use (MGD)
December Usage
Average daily water use for the month of December was
4.52 million gallons per day (mgd). Peak daily use was 5.92
mgd. Last year, average daily water use was 4.39 mgd for the
same time period, with a peak day of 4.67 mgd. Both the
average daily use and peak demand for December were
above the historic averages of 4.08 mgd and 4.56 mgd
respectively.
5.92
Peak 4.56
0
1
2
3
4
5
6
7
Peak Daily Demand (PDD)
The chart above shows Tigard's average daily water 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 colored
area. This shows the seasonality of water consumption and the close relationship with temperature.
Water Advisory Board Water Supply Update
Stored Water (ASR)
Lake Oswego-Tigard Water Treatment Plant & Bonita Pump Station
Data Metrics
Current
(Dec 22)
Prior Yr
(Dec 21)
Chlorine Residual 1.14 1.10
Alkalinity 22.20 21.30
pH 7.80 7.90
Temperature 6.06 7.97
0
20
40
60
80
100
120
140
160
180
200
0
50
100
150
200
250
300
350
400
Jan 2021Feb 2021Mar 2021Apr 2021May 2021Jun 2021Jul 2021Aug 2021Sep 2021Oct 2021Nov 2021Dec 2021Jan 2022Feb 2022Mar 2022Apr 2022May 2022Jun 2022Jul 2022Aug 2022Sep 2022Oct 2022Nov 2022Dec 2022Days 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: 22.20 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: 7.80
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:6.06C
(43F)
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 July 2011 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).
4.9
Average, 5.7
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Temperature for Current Month
4,928
Average, 5,134
0
2,000
4,000
6,000
8,000
10,000
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Flow for Current Month
7.3Average, 7.3
6.6
6.8
7.0
7.2
7.4
7.6
7.8
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
pH for Current Month
6.6Average, 5.7
0.0
5.0
10.0
15.0
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Turbidity for Current Month
Water Advisory Board Water Supply Update
0
2
4
6
8
10
12
14
16
18
20
Jul
2011
Jan
2012
Jul
2012
Jan
2013
Jul
2013
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
Turbidity of Clackamas River (NTUs)
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
Jul
2011
Jan
2012
Jul
2012
Jan
2013
Jul
2013
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
pH of Clackamas River
0
2,000
4,000
6,000
8,000
10,000
12,000
Jul
2011
Jan
2012
Jul
2012
Jan
2013
Jul
2013
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
Discharge (Flow) of Clackamas River (cfs)
0
5
10
15
20
25
Jul
2011
Jan
2012
Jul
2012
Jan
2013
Jul
2013
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
Temperature of Clackamas River (c)
Water Advisory Board Water Supply Update
January 2023 Update
Tigard Usage
Current
(Jan 23)
Prior Yr
(Jan 22)
Avg Daily Use (MGD)4.38 4.44
Avg Temp 48°48°
Peak Use (MGD)4.74 5.01
Peak Temp 54°60°
Tigard Storage
Stored Water (ASR)319.3 135.3
Days of Supply 177.5 62.6
Average
4.06
4.38
3.4
3.6
3.8
4
4.2
4.4
4.6
Average Daily Demand (ADD)
0
20
40
60
80
100
120
140
0
2
4
6
8
10
12
14
Jul 2020Aug 2020Sep 2020Oct 2020Nov 2020Dec 2020Jan 2021Feb 2021Mar 2021Apr 2021May 2021Jun 2021Jul 2021Aug 2021Sep 2021Oct 2021Nov 2021Dec 2021Jan 2022Feb 2022Mar 2022Apr 2022May 2022Jun 2022Jul 2022Aug 2022Sep 2022Oct 2022Nov 2022Dec 2022Jan 2023TemperatureMillion Gallons Per Day (MGD)Tigard Usage and Air Temperature Over Time
Peak Temperature Average Temperature Average Daily Use (MGD)Peak Use (MGD)
January Usage
Average daily water use for the month of January was 4.38
million gallons per day (mgd). Peak daily use was 4.74 mgd.
Last year, average daily water use was 4.44 mgd for the same
time period, with a peak day of 5.01 mgd. Both the average
daily use and peak demand for January were above the
historic averages of 4.06 mgd and 4.43 mgd respectively.
Peak 4.43 4.74
0
1
2
3
4
5
6
Peak Daily Demand (PDD)
The chart above shows Tigard's average daily water 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 colored
area. This shows the seasonality of water consumption and the close relationship with temperature.
Water Advisory Board Water Supply Update
Stored Water (ASR)
Lake Oswego-Tigard Water Treatment Plant & Bonita Pump Station
Data Metrics
Current
(Jan 23)
Prior Yr
(Jan 22)
Chlorine Residual 1.15 1.14
Alkalinity 22.42 20.97
pH 7.81 7.84
Temperature 7.01 6.64
0
20
40
60
80
100
120
140
160
180
200
0
50
100
150
200
250
300
350
400
Jan 2021Feb 2021Mar 2021Apr 2021May 2021Jun 2021Jul 2021Aug 2021Sep 2021Oct 2021Nov 2021Dec 2021Jan 2022Feb 2022Mar 2022Apr 2022May 2022Jun 2022Jul 2022Aug 2022Sep 2022Oct 2022Nov 2022Dec 2022Jan 2023Days 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: 1.15 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: 22.42 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: 7.81
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:7.01C
(45F)
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 July 2011 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).
5.8Average, 5.3
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Temperature for Current Month
3720.8
Average, 5,332
0
2,000
4,000
6,000
8,000
10,000
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Flow for Current Month
7.2
6.8
6.9
7.0
7.1
7.2
7.3
7.4
7.5
7.6
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
pH for Current Month
3.4
Average, 5.7
0.0
5.0
10.0
15.0
20.0
25.0
2012 2013 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
Jul
2011
Jan
2012
Jul
2012
Jan
2013
Jul
2013
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
Turbidity of Clackamas River (NTUs)
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
Jul
2011
Jan
2012
Jul
2012
Jan
2013
Jul
2013
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
pH of Clackamas River
0
2,000
4,000
6,000
8,000
10,000
12,000
Jul
2011
Jan
2012
Jul
2012
Jan
2013
Jul
2013
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
Discharge (Flow) of Clackamas River (cfs)
0
5
10
15
20
25
Jul
2011
Jan
2012
Jul
2012
Jan
2013
Jul
2013
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
Temperature of Clackamas River (c)
RETURN RECORDED DOCUMENT TO:
CITY HALL RECORDS DEPARTMENT,
CITY OF TIGARD
13125 SW Hall Blvd.
Tigard, OR 97223
CORPORATION
File No.
DEDICATION DEED
FOR ROAD OR STREET PURPOSES
Space above reserved for Washington County Recording information
The Tigard Water District does hereby dedicate to the public a perpetual right-of-way for street, road, and utility purposes on,
over, across, under, along, and within the following described real properties in Washington County, Oregon:
Attached Exhibit "A"
To have and to hold the above-described and dedicated rights unto the public forever for uses and purposes hereinabove stated.
The grantors hereby covenant that they are the owner in fee simple and the property is free of all liens and encumbrances, they
have good and legal right to grant their right above-described, and they will pay all taxes and assessments due and owing on the
property.
The true consideration for this conveyance is $ 0.00 . However, the actual consideration consists of or includes other property or
value given or promised which is the whole consideration.
IN WITNESS WHEREOF, I hereunto set my hand on this day of , 20 .
Tigard Water District
Name of Corporation Signature
8777 SW Burnham St, Tigard, Oregon 97224
Address Title
Signature
Tax Statement Mailing Address (if different from above)
Title
STATE OF OREGON )
) ss.
County of Washington )
This instrument was acknowledged before me on (date) by
(name(s) of person (s)) as (type of authority, e.g., officer, trustee, etc.) of
(name of party on behalf of whom instrument was executed).
Notary's Signature
My Commission Expires:
Accepted on behalf of the City of Tigard this day of , 20 .
City Engineer
AKS Job #4959
EXHIBIT A
Right-of-Way Dedication
A tract of land located in the Southwest One-Quarter of Section 10, Township 2 South, Range 1
West, Willamette Meridian, Washington County, Oregon, and being more particularly described
as follows:
Commencing at the northeast corner of the plat “Turnagain Heights”, recorded as Document
Number 98070612, Washington County Records, also being on the west line of Document
Number 2021-132516, Washington County Records; thence along said west line, North
01°49’12” West 25.05 feet to the east northeasterly corner of Document Number 93-000160,
Washington County Records, and the Point of Beginning; thence along the northerly line of said
Deed, North 88°11’57” West 16.64 feet; thence leaving said northerly line on a non-tangent
curve to the right (with a radial bearing of South 54°00’56” East) with a Radius of 40.00 feet, a
Central Angle of 11°42’11”, an Arc Length of 8.17 feet, and a Chord of North 41°50’10” East
8.16 feet; thence along a compound curve to the right with a Radius of 58.50 feet, a Central
Angle of 12°59’30”, an Arc Length of 13.26 feet, and a Chord of North 54°11’00” East 13.24
feet to the west line of said Deed; thence along said west line, South 01°49’12” East 14.35 feet to
the Point of Beginning.
The above described tract of land contains 135 square feet, more or less.
The Basis of Bearings for this description is based on Survey Number 34130, Washington
County Survey Records.
9/12/2022
SW 122ND AVENUESW AUTUMNVIEW
STREET
RIGHT-OF-WAY DEDICATION
B
RETURN RECORDED DOCUMENT TO:
CITY HALL RECORDS DEPARTMENT,
CITY OF TIGARD
13125 SW Hall Blvd.
Tigard, OR 97223
CORPORATION
File No.
DEDICATION DEED
FOR ROAD OR STREET PURPOSES
Space above reserved for Washington County Recording information
The Tigard Water District does hereby dedicate to the public a perpetual right-of-way for street, road, and utility purposes on,
over, across, under, along, and within the following described real properties in Washington County, Oregon:
Attached Exhibit "A"
To have and to hold the above-described and dedicated rights unto the public forever for uses and purposes hereinabove stated.
The grantors hereby covenant that they are the owner in fee simple and the property is free of all liens and encumbrances, they
have good and legal right to grant their right above-described, and they will pay all taxes and assessments due and owing on the
property.
The true consideration for this conveyance is $ 0.00 . However, the actual consideration consists of or includes other property or
value given or promised which is the whole consideration.
IN WITNESS WHEREOF, I hereunto set my hand on this day of , 20 .
Tigard Water District
Name of Corporation Signature
8777 SW Burnham St, Tigard, Oregon 97224
Address Title
Signature
Tax Statement Mailing Address (if different from above)
Title
STATE OF OREGON )
) ss.
County of Washington )
This instrument was acknowledged before me on (date) by
(name(s) of person (s)) as (type of authority, e.g., officer, trustee, etc.) of
(name of party on behalf of whom instrument was executed).
Notary's Signature
My Commission Expires:
Accepted on behalf of the City of Tigard this day of , 20 .
City Engineer
City of Tigard
13125 SW Hall Blvd
Tigard, OR 97223
(503) 639-4171
www.tigard-or.gov
Map Created:
01/31/2023
City of Tigard, Oregon
Reservoir #4 -
Request for
Easement
Vicinity Map
Scale:
Data is derived from multiple sources. The City of Tigard
makes no warranty, representation, or guarantee as to
the content, accuracy, timeliness or completeness of any
of the data provided herein. The City of Tigard shall
assume no liability for any errors, omissions, or
inaccuracies in the information provided regardless of
how caused.
Miles0.04