10/11/2023 - Packet
WATER ADVISORY BOARD AGENDA – October 11, 2023
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: Wednesday, October 11, 2023, 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 – August 9, 2023
Action: Motion to approve the August 9, 2023, minutes.
3. Public Comments
Call for comments from the public.
4. Water Supply Update – Sammy Rico
5. Police Services Levy Renewal – Kelsey Anderson
6. Reservoir 18 Update – Shasta Billings-Beck
7. Non-Agenda Items
Call for non-agenda items from the board.
8. Next Meeting
December 13, 2023
Location: 10 mil PW
Time: 5:30 pm
WATER ADVISORY BOARD AGENDA – October 11, 2023
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 Water Supply Update
August 2023 Update
Tigard Usage
Current
(Aug 23)
Prior Yr
(Aug 22)
Avg Daily Use (MGD)10.33 10.37
Avg Temp 87°87°
Peak Use (MGD)11.84 11.24
Peak Temp 108°100°
Tigard Storage
Stored Water (ASR)351.1 335.0
Days of Supply 193.5 183.2
10.33Average
9.49
0
2
4
6
8
10
12
Average Daily Demand (ADD)
0
20
40
60
80
100
120
0
2
4
6
8
10
12
14
TemperatureMillion Gallons Per Day (MGD)Tigard Usage and Air Temperature Over Time
Peak Temperature Average Temperature Average Daily Use (MGD)Peak Use (MGD)
August Usage
Average daily water use for the month of August was 10.33
million gallons per day (mgd). Peak daily use was 11.84 mgd.
Last year, average daily water use was 10.37 mgd for the
same time period, with a peak day of 11.24 mgd. Both the
average daily use and peak use for August were above the
historic averages of 9.49 mgd and 10.88 mgd respectively.
11.84Peak10.88
0
2
4
6
8
10
12
14
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
(Aug 23)
Prior Yr
(Aug 22)
Chlorine Residual 1.11 1.08
Alkalinity 33.24 32.06
pH 7.77 7.91
Temperature 21.71 21.46
0
50
100
150
200
250
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 2023Feb 2023Mar 2023Apr 2023May 2023Jun 2023Jul 2023Aug 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: 1.11 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: 33.24 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:21.7C
(71F)
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).
21.0
Average, 20.1
17.5
18.0
18.5
19.0
19.5
20.0
20.5
21.0
21.5
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Temperature for Current Month
717.5
Average, 869
0
200
400
600
800
1,000
1,200
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Flow for Current Month
7.8
7.6
7.7
7.7
7.8
7.8
7.9
7.9
8.0
8.0
8.1
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
pH for Current Month
0.7
Average, 0.8
0.0
0.5
1.0
1.5
2.0
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
Jul
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
Jul
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
Jul
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
Jul
2023
Temperature of Clackamas River (c)
Water Advisory Board Water Supply Update
September 2023 Update
Tigard Usage
Current
(Sep 23)
Prior Yr
(Sep 22)
Avg Daily Use (MGD)7.39 8.79
Avg Temp 76°81°
Peak Use (MGD)8.78 10.39
Peak Temp 95°93°
Tigard Storage
Stored Water (ASR)324.1 329.7
Days of Supply 179.4 180.4
7.39
Average
7.18
0
2
4
6
8
10
Average Daily Demand (ADD)
0
20
40
60
80
100
120
0
2
4
6
8
10
12
14
TemperatureMillion Gallons Per Day (MGD)Tigard Usage and Air Temperature Over Time
Peak Temperature Average Temperature Average Daily Use (MGD)Peak Use (MGD)
September Usage
Average daily water use for the month of September was
7.39 million gallons per day (mgd). Peak daily use was 8.78
mgd. Last year, average daily water use was 8.79 mgd for the
same time period, with a peak day of 10.39 mgd. The
average daily use for September was above the historic
average of 7.18 mgd, but the peak daily was below the
historic average of 9.32 mgd.
8.78
Peak 9.32
0
2
4
6
8
10
12
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
(Sep 23)
Prior Yr
(Sep 22)
Chlorine Residual 1.13 1.10
Alkalinity 32.89 32.95
pH 7.84 7.66
Temperature 17.73 18.26
0
50
100
150
200
250
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 2023Feb 2023Mar 2023Apr 2023May 2023Jun 2023Jul 2023Aug 2023Sep 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: 1.13 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: 32.89 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: 7.84
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:17.73C
(64F)
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).
16.8Average, 16.3
14.0
14.5
15.0
15.5
16.0
16.5
17.0
17.5
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Temperature for Current Month
830.4
Average, 1,027
0
500
1,000
1,500
2,000
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Flow for Current Month
7.9
7.7
7.7
7.8
7.8
7.9
7.9
8.0
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
pH for Current Month
0.9
Average, 1.5
0.0
0.5
1.0
1.5
2.0
2.5
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
Jul
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
Jul
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
Jul
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
Jul
2023
Temperature of Clackamas River (c)
Kelsey AndersonTigard Police Public Information OfficerTigard Police Services Renewal LevyMay 2024
Police Services Renewal LevyIn May 2024, the City of Tigard will ask the community to help preserve our investments in public safety by supporting the renewal levy.Maintain & Retain: -Maintains rate of 0.29 per $1,000 of assessed property value first passed by Tigard voters in 2020.-Retains critical public safety staffing & services we already have in place:•8 patrol officers•1 School Resource Officer•1 Property/Evidence Specialist•1 Records Specialist•Advanced Crisis Intervention & De-escalation Training
How Did We Get Here?Between 2012 and 2019:•Sworn staffing droppedfrom 72 to 69 FTE•During that same time, the City’s population grewby 14.5%7268 68 68 687372686965666768697071727374Pop:48,415Pop:54,520(Daytime population roughly doubles)
How Did We Get Here?•2019: An independent audit recommended adding 8 patrol officers, 1 SRO to “right size” the dept•2020: Tigard voters passed the levy•$0.29 per $1,000 of assessed property value•2020 – 2023: Need continues to grow•City population & calls for service both up•2022: 1,000 more dispatched calls than in 2021•Property taxes fall short of expenses
Current Challenges•Even with the levy, there are 3-5 patrol officers on duty at any given time•Since 2020: police calls are becoming increasingly complex, involving more people in mental health crisis•Staffing: vacancies, training, academy, light duty, military leave, FMLA•7 vacancies, 14people in other categories listed above (as of 10/10/23)•That leaves us 23officers to fill 3 shifts 24/7. Most are working OT to try to meet minimum staffing levels.Jail = 26 mile roundtrip to Hillsboro
Current Challenges:We consider 2018 to be the pre-pandemic peak for police calls and community needs. In the time since the 2020 levy passed, those figures have only grown. Violent crimes alone have nearly doubled from 2018 to 2022. 1121181001482062018 2019 2020 2021 2022VIOLENT CRIMES5074174364486022018 2019 2020 2021 2022CRIMES AGAINST PERSONS248121872316225828522018 2019 2020 2021 2022CRIMES AGAINST PROPERTY
Increased Calls from 2021-2022-3%-2%-1%0%1%2%3%4%5%6%% Dispatched Calls Change from 2021–2022TigardTualatinSherwoodBeavertonWash. Co.Hillsboro5%4%3%2%0%-2%From 2021 – 2022, Tigard saw a 5% increase in dispatched police calls.That’s the biggest increase out of all of our neighboring cities.
•Public education & outreach campaign underway through May.•“What information do you need to make an informed decision?”Next Steps
Learn more: www.tigard-or.gov/policeserviceslevyQuestions? Email AskTigardPolice@tigard-or.govThank you!
Reservoir 18 and Pump StationWater Advisory Board Update –October 11, 2023
Agenda1. Happenings since May 20232. What’s on the Horizon3. Schedule4. Communications Debrief5. General Q/A
May/June 2023•100% For Construction drawings received•1200‐C permit received from DEQ•Pre‐construction Open Houses completed for 3 main areas•East Piping Upgrades•Reservoir 18•West Piping Upgrades & Pump Station 13•Mass excavation activities began
July/Aug. 2023•Mass excavation activities continue•Neighborhood meeting for Major Modification for Reservoir 18 completed•Changes to pipe routing in NW corner of site and geometry of stormwater pond required per geotech engineer•Piping from Site 13 up to Sunrise Lane installed•First Coffee with a Contractor event
Sept./Oct. 2023•Mass excavation finished•Underdrain piping and drain rock installed•Vibration monitoring was set up at property lines of two homes with close proximity•Levels indicate no risk of damage to structures•Site prepared for wet weather•Access road rocked, storm drainage installed, exposed soil covered with straw, construction slopes covered with plastic sheeting•Marion (tank subcontractor) mobedto site•West piping upgrades construction began Oct. 9th
On the Horizon:Fall 2023/ Winter 2024•Tank construction•4 long slab‐on‐grade pours from end of October to end of November; noise variance request has been submitted•Sunrise Park will be re‐opened and have limited access•West Piping Upgrades slated for completion in Dec. 2023•East Piping Upgrades will be installed from Dec. 2023 to Oct. 2024
Current ScheduleReservoir 18•Tank Construction Oct. 2023 –Oct. 2024(Limited park access)•Testing & Tank Online Fall 2024(Limited park access)•Backfill & Landscaping Spring – Summer 2025(Sunrise closed)Pump Station 13•Construction June 2023 –Fall 2024•Pump Station Online Fall 2024Offsite Piping•West Upgrades Oct. 2023 –Dec. 2023•East Upgrades Dec. 2023 –Oct. 2024
Project‐specific Questions?
Communications Debrief•City webpage (https://www.tigard‐or.gov/Home/Components/FacilityDirectory/FacilityDirectory/33/384?npage=2)•General project info posted here, Engage page linked as well •Engage page (https://www.engage.tigard‐or.gov/reservoir)•Project updates and various information posted here•13 posts from Mar. 2021 –Sept. 2023•Tigard Public Works Facebook/Instagram•Citizen Advisory Committee for near‐term park amenities•8 members, 3 meetings completed so far
Communications Debrief•Public communication on this project has exceeded what is typical for CIP projects•9 Doorhangers to residents prior to various project activities•3 coordinated with Engage posts•3 neighborhood meetings for land use applications•1 online open house/survey•3 pre‐construction open houses•4 social media posts re: construction/park access•1 coffee with a contractor event•Emails and phone calls have been returned within 2 business days (barring PTO)
Communications Debrief•Perception of neighborhood’s position:•No one has relayed negative feedback or frustration regarding lack of information•Feedback that was given to City Engineer at a Pre‐construction Open House:•City project team has been wonderful to work with and they were quite pleased with how all their various questions have been answered•Question for the WAB:•Is there additional information anyone feels the public should be receiving that they aren’t currently?
Communications Questions?