Greater Vernon Water 2012 Annual Report

Transcription

Greater Vernon Water
2012 Annual Report
Greater Vernon Water
9848 Aberdeen Road
Coldstream, BC
V1B 2K9
Prepared for: Interior Health and RDNO
Prepared by: Renee Clark, Water Quality Manager, RDNO
Contributors: RDNO Engineering Department
June 30, 2013
TABLE OF CONTENTS
INTRODUCTION ....................................................................................................................... 1
BACKGROUND ......................................................................................................................... 1
WATER SYSTEM OVERVIEW .................................................................................................. 1
Sources and Treatment.............................................................................................................. 2
Seasonal/ Agriculture water sources .......................................................................................... 4
Distribution System .................................................................................................................... 5
System Control – Supervisory Control And Data Acquisition software (SCADA) ........................ 5
Pressure-Reducing Valve Stations (PRV) .................................................................................. 5
WATER SYSTEM VALUE .......................................................................................................... 6
CAPITAL WORKS PROJECTS.................................................................................................. 8
Water Supply and Distribution System Upgrading ...................................................................... 8
WATERMAINS........................................................................................................................... 8
Water Main Breaks .................................................................................................................... 8
New Water Mains ....................................................................................................................... 9
STAFFING ................................................................................................................................. 9
RDNO Engineering Staff Overview ............................................................................................ 9
Operators Overview ..................................................................................................................10
SOURCE ASSESSMENTS AND SOURCE RESPONSE PLANS .............................................11
MONITORING PROGRAM .......................................................................................................13
Source and treatment testing parameters .................................................................................14
Turbidity ....................................................................................................................................14
Chemical Analysis .....................................................................................................................15
Treatment testing parameters ...................................................................................................15
Distribution testing program ......................................................................................................16
Bacterial test results ..................................................................................................................18
EMERGENCY RESPONSE / NOTIFICATION ..........................................................................19
Water Quality Notification ..........................................................................................................19
CUSTOMER CALLS AND RESPONSE ....................................................................................20
CROSS CONNECTION CONTROL PROGRAM .......................................................................20
WATER CONSUMPTION .........................................................................................................21
WATER SUSTAINABILITY AND DEMAND SIDE MANAGEMENT ...........................................23
Water Consumption Data Analysis ............................................................................................23
Domestic Tiered Water Rates ...................................................................................................23
i
Education Programs .................................................................................................................23
Communication .........................................................................................................................24
Long Term Improvements .........................................................................................................24
CONCLUSION ..........................................................................................................................24
APPENDIX 1 .............................................................................................................................25
SOURCE (RAW) WATER COMPREHENSIVE ANALYSIS .......................................................25
Kalamalka Lake Raw Water Summary ......................................................................................28
Duteau Creek Water Quality Summary .....................................................................................34
APPENDIX 2 .............................................................................................................................37
WATER TREATMENT ..............................................................................................................37
Turbidity Index and Statics ........................................................................................................38
Notification Targets ...................................................................................................................38
Mission Hill Water Treatment Plant (UV Disinfection) ................................................................38
Duteau Creek Water Treatment Plant .......................................................................................39
APPENDIX 3 .............................................................................................................................42
TREATED WATER DISTRIBUTION SYSTEM ..........................................................................42
GVW Distribution Summary ......................................................................................................46
Kalamalka / Mission Hill Water Treatment Plant ........................................................................46
Duteau Creek Water Treatment Plant .......................................................................................46
ii
INTRODUCTION
As required by the British Columbia Drinking Water Protection Act, the Regional District of North
Okanagan (RDNO), Greater Vernon Water (GVW) provides the following water system and
water quality annual report.
This report provides an overview of annual consumption data, updates on Water Source
Assessments and Response Plans, Water Monitoring Plan, Emergency Response Plan, Cross
Connection Control Program, Environmental Operators Certification Program and a Summary of
the 2012 Water Quality Analysis.
This report outlines where water comes from in the Greater Vernon Water service area, how it is
distributed, and how it is treated to ensure it is safe to drink. Drinking water can be a complex
issue and much of the information provided in the report is technical in nature. Please contact
GVW (phone: 250-550-3700 or email: [email protected]) should you have any questions.
BACKGROUND
GVW is a regional water system that supplies and delivers water to customers in the City of
Vernon (CoV), the District of Coldstream (DoC), and Electoral Areas “B” and “C”. GVW also
supplies and delivers water to customers in Electoral Area “D”, and bulk water to the Township
of Spallumcheen.
The RDNO owns and manages the GVW water system, and the CoV and DoC are contracted
for the operations and maintenance of the system. In British Columbia a community water
system must hold a “Permit to Operate” as directed in the Drinking Water Protection Act and
Drinking Water Protection Regulations passed May 16, 2003 by the Province of B.C. and follow
the Guidelines for Canadian Drinking Water Quality, 6th edition.
Interior Health (IH) has advised GVW that “Under the legislation, the province has increased the
basic expectations around assessing water systems, certifying operators and suppliers, and
monitoring and reporting on water quality. The legislation gives provincial drinking water officers
(i.e. Interior Health) increased powers to protect water sources from contamination by a
drinking-water health hazard. In addition, the drinking-water officers will oversee a source-totap assessment of every drinking-water system in the province to address all potential risks to
human health.”
This report outlines the programs and projects that GVW has developed and implemented to
meet the aforementioned policies and legislation.
WATER SYSTEM OVERVIEW
GVW holds eighty-three (83) water licences and supplies water for domestic purposes via five
(5) surface water intakes and one (1) groundwater well. Duteau Creek provides the largest
volume of water supply to the GVW service area. Kalamalka Lake intake is the second largest
water supply, and two intakes on Okanagan Lake service two small water systems, the Outback
and Delcliffe. Goose Lake functions as an open-balancing reservoir for the Duteau Creek
distribution system.
1
Sources and Treatment
Duteau Creek
Duteau Creek is a controlled watershed with seven (7)
earthen dams forming the Aberdeen Plateau
Reservoirs comprised of: Grizzly, Aberdeen and
Haddo Lakes. The Duteau Creek watershed covers
an area of approximately 21,275 ha (213 km2)
between Grizzly Hills summit (1,800 meters) on the
Aberdeen Plateau and the Headgates Diversion Dam
(intake) at an elevation of 660 meters.
Duteau Creek flows approximately 13 km before
entering a small retention reservoir (Lake Harvey).
This intake is referred to as Headgates. Rotating
screens remove large to medium particles and debris
before entering a 1.2 m diameter transmission pipe to
the Duteau Creek Water Treatment Plant (DCWTP).
Figure 1: Aberdeen Plateau Reservoirs
GVW commissioned the DCWTP in 2010. The DCWTP Phase 1 was built to provide consistent
safe drinking water for the growing population in the Greater Vernon service area and to assist
in meeting potable water regulations. The DCWTP clarifies water by separating suspended
solids from the water. A coagulant is added which causes particles suspended in the water to
aggregate into clumps or masses called flocculent (floc). Air is then injected at the base of the
floc tanks; the rising air bubbles attach to the floc and float it to the surface where skimmers
remove the floc particles. This process is called Dissolved Air Flotation (DAF) and removes the
yellow colour (True Color Units (TCU) 34-94) characteristic of the water from the Duteau Creek
water source.
Clear water is then drawn from the bottom of the basin, chlorinated and discharged to a 10
Megalitres (ML) covered reservoir. The design capacity of the plant is 160 Megalitres/day
(ML/d), the maximum day demand in 2012 was 122 ML/d.
Figure 2: Duteau Creek Water Treatment Plant (Phase 1)
2
Kalamalka Lake
Kalamalka Lake has been used as the primary source of drinking water for the Greater Vernon
urban area for many decades. The Kalamalka Lake Pump Station is located on West Kal Road
in Coldstream. The existing 900 millimetre (mm) intake is at 20 meters (m) deep and extends
252 m from the shoreline. The pump station is equipped with:
4 - Vertical Turbine Pumps:
- 2 - 138 Litres per second (L/sec), 200HP, fixed speed
- 2 - 235 L/sec, 400HP, Variable Frequency Drive (VFD)
Figure 3: Kalamalka Lake - The pump station is located at the north-end of the lake
The water is pumped from Kalamalka Lake to the Mission Hill Water Treatment Plant (MHWTP)
for disinfection treatment using a Trojan Ultra Violet reactor at a 40 mega joules per square
centimetre (mJ/cm2) dose, and chlorine generated on site. The plant has a design capacity of 60
ML/d at 89% Ultra Violet Transmissivity (UVT). The UVT percentage is a measure of the UV
that is able to pass through the water. The maximum day demand at this plant in 2012 was 42.6
ML/d.
Figure 4: Mission Hill Water Treatment Plant - UV Disinfection Process
3
Seasonal/ Agriculture water sources
Goose Lake
Goose Lake is located west of Swan Lake. In the past, it has been used as a combined
domestic and irrigation source. It is used to reduce pressure loss and meet peak demand during
the irrigation season. During 2012, the peak demand was not high enough to warrant using
Goose Lake (for the first time in 40 years), GVW avoided the need to have Water Quality
Advisories as had been done in the past. Following completion of the West Swan Lake
Separation project in 2013, Goose Lake storage water will only be used for irrigation purposes.
At this time, the Goose Lake reservoir is still filled with treated water from the DCWTP, with an
RP device installed to ensure no cross connection with the potable water system. It is planned
to chlorinate the irrigation water when it is first turned on each year, but then once demands pick
up, not to chlorinate as the velocities will flush the pipes of any accumulated sediments or
organics.
Coldstream Ranch Well #1
Coldstream Ranch Well #1 is 50 metres (162 feet) deep with a pumping capacity of 76 L/sec
(1200 US Gallons per minute (USGPM)). This Well has a confining clay layer and has been
reconstructed to improve capacity.
As of 2012, the majority of agricultural water demand is supplied by potable water. Some
separation work has occurred over the past four years to develop a non-potable water supply
distribution system to meet agricultural water demands, and this supply is sourced primarily
from Duteau Creek and seasonally by Goose Lake and King Edward Lake/ Deer Creek.
1. Bella Vista agricultural separation project was completed in 2009. This system is still
fed by potable water; however, starting in 2013, the system will be served by Goose
Lake.
2. The Von Keyserlingk area east of Learmouth Road in Coldstream was completed in
2010. This system has been fed by raw Duteau Creek water since completion.
3. The King Edward Reservoir / Deer Creek and Coldstream Ranch Well #2 were
separated from the domestic supply in 2011. These untreated sources now supply
irrigation water to parts of the Coldstream Ranch. In 2012, an RP device was set up at
Ranch Well #1 to feed into either the potable or the non-potable systems.
4. The first phase of the West Swan Lake Separation project was completed in 2012. This
area is still fed by potable water however starting in 2013, this system should be served
by Goose Lake. This separation project is expected to be completed in 2013.
5. In conjunction with the Highway 6 realignment project, the Binns Separation project was
commenced. Design of new water mains along the highway was completed, and MoTI
tendered the project in 2012. Construction is planned for 2013 and will tie this system
into the King Edward / Ranch Well #2 system, removing it from the domestic system.
6. The pre-design of the Springfield Separation commenced in 2012, with design and
construction scheduled for 2013. This system will tie into the Von Keyserlingk area and
be fed by raw Duteau Creek water.
4
Distribution System
The GVW distribution system has over 600 km of pipeline, 43 pump stations, 83 pressure
reducing stations and 20 balancing concrete reservoirs delivering approximately 22,900 ML of
water to customers annually. This volume of water is equivalent to a square kilometre 22.9
meters deep, or enough to fill BC Place Stadium 8.7 times a year.
Table 1: GVW Water Mains
Pipe Material
Length In Service
Comments
Cast Iron
Ductile Iron
58 km
95 km
PVC
206 km
Concrete
Asbestos Cement
High Density Polyethylene
Steel
Unknown
25 km
204 km
2 km
6 km
54 km
Majority installed prior to 1978
Ductile iron is still used in some
applications
Most pipe installed since 1979 has
been PVC
Used for specialized applications
Used for specialized applications
Materials for some older sections are
not known
All of the water in the MHWTP distribution system is pumped from Kalamalka Lake. There are
over 30 pressure zones including 17 booster pump zones. The storage reservoir in the highest
pressure zone is at an elevation 765 m (2,510 ft.) above sea level. Water must be pumped from
Kalamalka Lake over 374 m (1,227 ft.) in elevation to this reservoir.
In contrast, the vast majority of water from the DCWTP distribution system does not require
pumping and flows by gravity. There are 50 pressure zones including 14 irrigation only zones.
Seven (7) of the 23 pumped zones are used only in the summer due to pipe friction losses. The
highest pressure zone is at an elevation 730 m, which is only 80 m higher than the source.
System Control – Supervisory Control and Data Acquisition software (SCADA)
The operation & maintenance monitoring of reservoir water levels, operating pumps, monitoring
quality control equipment and maintaining a historical data file of the water systems operations
is made easier by SCADA, a comprehensive software program used by GVW. Connected by
wireless links, the SCADA software monitors sensors at all of the reservoirs and pump stations.
Interpreting the data received, it then automatically turns pumps on and off to keep the system
flowing smoothly. When a problem is detected within the system, the SCADA system issues
alarms and, depending on the location of the problem, either the CoV or DoC Operators are
notified.
Pressure-Reducing Valve Stations (PRV)
The maximum design water pressure for piping within the majority of the water distribution
system is 1040 kPa (150 psi). There are 83 PRV’s within the GVW system. The PRV's role is
to control the pressure in the water system by creating head losses that prevent pressures from
exceeding the design maximum.
The CoV or the DoC operators currently overhaul the PRV stations as required in an effort to
extend their service life. Most individual premises (homes, business) also have secondary
5
PRV’s as fluctuating pressures can place excessive stress on internal plumbing systems and
fixtures.
WATER SYSTEM VALUE
The total value of the GVW distribution system, as detailed in Table 2, is estimated to be $547
million (Master Water Plan, 2012). This estimated cost includes the CoV reclaimed water
system (including MacKay Reservoir) which is owned and operated by the CoV.
In 2012, GVW spent $782,000 on water infrastructure replacement. The replacement program
is designed to address required annual maintenance and other infrastructure failures within the
water system on a priority basis. The maintenance program helps to extend the life expectancy
of a majority of these water infrastructure elements.
6
Table 2: Approximate Water System Costs [excerpt from the 2012 Master Water Plan – Estimated value of
GVW Water System]
Diamete r
(mm)
It em
Pi peline
Un it Cost
Quantity
Exte nsi on
25
5,630
$
170
957,015
50
24,906
$
180
4,483,120
75
7,895
$
190
1, 499,955
100
94,285
$
220
20,742,638
150
226,288
$
255
57,703,524
200
114, 106
$
310
35,372,913
250
$
$
365
420
14, 367,433
300
39,363
49,809
350
17,467
$
490
8,558,693
400
15,060
545
8,207,651
450
9,059
$
$
600
5,435,400
500
8,345
$
700
5, 841,304
600
9,980
s
765
7,634,318
750
16,222
$
920
14,923,881
900
1200
7, 143
$
1,080
7, 714,440
4, 787
$
1, 390
6,653,930
Total s
20,919,830
221,100,000
Qth~r lnfri!~t r!.!!:t!.!r~
1
Duteau Rese rvoi rs
Other Reservoirs
2
In takes (KLPS, Du tea u, Go ose, Ki ng Ed.)
W ell s ( Ranch W ell #1 and #2)
Tanks (@$500k/M L)
3
10,000,000
3
500, 000
1,500,000
4
4,000, 000
16,000,000
2
1,500, 000
500, 000
3,000,000
10,500,000
4,950,000
21.0
PRV
99
50,000
Misc. Val ves
20
42
100, 000
Pump Stations
Mission Hill WTP
3
Duteau Creek WTP
3
Chlo ri nat i on Buildi ngs (Goose, King Ed.)
Agricu ltural Services
varies
30,000,000
2, 000,000
33,500,000
1
10,000, 000
10,000,000
1
30,000,000
30,000,000
2
500,000
1,000,000
1050
4, 000
4, 200,000
Su b-Total
146, 700,000
367,800,000
Co ntinge ncy
30%
110,300,000
Enginee ri ng & Envi ronm ental
15%
55,200,000
Total Value
$533,300,000
No tes.
1. M ajor Infrastructure co st s are lump su m, and for compariso n purpo se s for this analysi s.
2. Othe r re se rvoirs inclu de Goose Lake, MacKay, Ki ng Edwa rd, etc. Costs to b ui l d dykes and in takes.
3. Wat er t reatm ent plant cost s are cu rrent only, and do no t reflect any ad ditional cost s r equ ire d t o
app ly fi It rati on or other IHA re qui re ments in the future.
4. Costs ref lect total rep lacem ent costs ( 2012 $)
5. CoV Reclamat ion Syst em (incl . MacKay Reservoi r) va lu ed at $14,0 65,000. Not include d here. Part
o f City of Vernon Liq uid Wastewat er M anageme nt Plan.
7
CAPITAL WORKS PROJECTS
Water Supply and Distribution System Upgrading
Table 3: Approximate Water System Costs
Capital Projects completed in 2012
Numerous water main replacements
throughout the CoV.
West Swan Lake Separation Project
Bessette PRV Station
King Edward Separation
Binns Separation
Springfield Separation
Kal Lake Pump Station Upgrades
DCWTP Phase 1
DCWTP Phase 2
Brief Description
Replacements are typically added to the
Capital plan because of age, material, break
history, or fire flow requirements.
5.5 km of water main twinned along Old
Kamloops Road, as well as Haney, Goose
Lake, Agassiz and Bremmer Roads. One
third of properties between 42nd Avenue and
Highway 97 switched to the new irrigation
main. In 2013, the remaining 2.5 km of Old
Kamloops Road and the remaining services
will be completed.
New station to fill Lavington reservoir. This
will replace the temporary system that was
put in place after the Antwerp Wells were
shut down.
RP device installed at Ranch Well #1 so that
it can feed into either the potable or the non
potable system.
Design completed for Phase 1 and given to
MoTI for tender in conjunction with their
Highway 6 realignment project. Construction
to occur in 2013.
Pre-design started. Design and Construction to
occur in 2013 and 2014.
Installation of larger pumps and variable
frequency drive for domestic water system.
Final deficiencies completed and final payments
at end of project.
Filter Pilot Study progressing. Most of the study
work was completed in 2012. Draft report is
pending.
WATER MAINS
Water Main Breaks
Most water utilities frequently experience minor disruptions. Pipes break, valves stick, hydrants
leak and power outages occur. Although these are not anticipated, the problems experienced
can usually be corrected with minimal disruption, and regular service can be restored quickly.
In cases of water main breaks, GVW adheres to the procedures set out in the American Water
Works Association (AWWA) Standard C651-92 regarding water main chlorination prior to recommissioning of the main.
8
In 2012, operations responded to, and repaired, 14 water main breaks in the CoV and Electoral
Areas “B” and “C” of the RDNO. The DoC responded to 9 service repairs and 13 water main
breaks. (Note: service connection or hydrant lead breaks are not included in this total.)
Typically, breaks or disruptions to water service are caused by conditions that can be repaired
and reinstated quickly, without risk to public health. Sometimes however, situations arise that
require extra care to ensure the integrity of the water system has not been compromised. GVW
endeavours to keep Interior Health apprised of any extraordinary situations that may adversely
impact the water system.
New Water Mains
Disinfection of a new water main is completed in accordance with AWWA C651 - Continuous
Feed Method. If the water samples taken following initial disinfection are not clean, the process
is repeated.
STAFFING
The overall management of GVW lies with the RDNO. Operations & Maintenance of the water
supply, water treatment and distribution system is contracted under agreement with the CoV
and DoC under the direction of RDNO staff.
RDNO staff also manages the Cross Connection Control (CCC) and Water Quality Programs on
behalf of GVW and its municipal partners.
RDNO Engineering Staff Overview
Table 4: RDNO Engineering Department
Engineering – Greater Vernon Water
Dale McTaggart
Al Cotsworth
Sandy Edwards
Renee Clark
Zee Marcolin
Rod Pleasance
Connie Kruger
Jennifer Miles
James de Pfyffer
John Bartell
Larry Gardiner
Skyler Ganz
Keiko Brod
Zara Clapp
General Manager of Engineering
Utilities Manager (retired March 2013)
Water Treatment Manager
Water Quality Manager
Utilities Engineer (Greater Vernon Water Manager–March 2013)
Project Engineer
Water Quality Technologist
Water Sustainability / Cross Connection Control Coordinator
Senior Engineering Technologist
Engineering Technologist
Engineering Technologist (Cross Connection Control Officer 2013)
Engineering Technician
Environmental Technician
Cross Connection Control Officer
9
Operators Overview
Section 12 of the Drinking Water Protection Regulations (DWPR) refers to qualification
standards for persons operating water supply systems. In this section, the “Environmental
Operators Certification Program” (EOCP) is required for certification of operators of a water
system. A person is qualified to operate, maintain or repair a water supply system if the person
is certified by the EOCP for the class of the system as classified under the EOCP.
The following is a listing of the operators certified through the EOCP that are employed by the
CoV and the DoC (who are contracted by the RDNO to operate the GVW treatment and
distribution system). As of January 1, 2013 a change in contract with the CoV and with the DoC
shifted the source and treatment/ treatment plant operators to being employed by the RDNO.
Table 5: CoV Operators
Employed by the City of Vernon in 2012
Last Name
First Name
Certification #
Briggs
Geordie
6495
Clerke
Tom
7397
Cleverly
Curtis
7193
Connor
Bryce
2050
Dorge
Guy
6216
Dunsdon
Jennifer
7387
Erickson
James
3626
Fugel
Tom
2096
Gawne
Kevin
750
Gaythorpe
Glen
7271
Gibson
Don
5922
Heidt
Kopp
Lay
Lee
Markel
Martin
Moore
Parker
Prodaniuk
Rempel
Richie
Ross
Svenhard
Thomas
Dustin
Tony
Paul
Herbert
Marvin
Allan
Don
Ryan
Greg
Chris
Ron
Gordon
Wayne
Jamie
4498
6188
2097
3014
3291
5900
1816
6988
6219
7192
1821
5219
1337
7550
Certification Held
WDII
WDI
WDII
WDIV, CH, WTII
WDII
WTII (2013 RDNO)
WDIII, MWWTI, WWCI, CH
WDII, CH
WDII
WDI
WDII, WTIII, WWCI, MWWTI
(2013 RDNO)
WDII, WTIV (2013 RDNO)
WWCI
WDII, CH (2013 RDNO)
WDII, CH
WDIII, CH WTII
WDI
WDII
WDII
WDI
WDI
WDI, CH
WDII, CH, WTI (2013 RDNO)
WDII, CH
WDI, WWCI
10
Table 6: DoC Operators
Employed by the District of Coldstream
Last Name
First Name
Certification #
Pethick
Mike
1424
McKay
Gordon
3471
Acton
Dave
3407
Comeau
Brent
5662
Blundell
Neil
5660
Bracewell
Ken
5661
Mazereeuw
Jack
5747
Nicholson
Cory
7053
Davyduke
Matt
7160
Scherck
James
7776
Certification Held
WDII, WWCII,CH,SWS,CCC
WDI
WDIII, WWCII, CH, CCC
WDII, WWCII, CCC
WDII, WWCII, CH, CCC
WDI, WWCI, CH
WDI, WWCI,SWS
WDI, CH
WDI
WDI, WWCl
SOURCE ASSESSMENTS AND SOURCE RESPONSE PLANS
Duteau Creek is a major source of water supply for GVW customers. Protection of the
watershed is important for the security of quality drinking water. The community watershed is
located southeast of the DoC and is upstream of the Headgates intake (point of diversion). The
community watershed area is primarily Crown Land resulting in the RDNO having little control
over land use and practice. The Duteau Creek Watershed Assessment and Recommendations
for Source Protection Report was received by the RDNO in December 2008 (prepared by Kerr
Wood Leidal Consulting Engineers and Dobson Engineering Ltd).
Figure 5: Duteau Creek Community Watershed and Information signs
The implementation of a Watershed Protection Response Plan will be the key to a successful
source water protection program. An initial stakeholder meeting was held in February 2009.
The goal is to increase knowledge of all stakeholders and to find creative, yet sound ways, to
move forward with the recommendations from the Duteau Creek Assessment. The Duteau
Creek Watershed Protection Plan Technical Advisory Committee (TAC) was formed in 2009 and
includes representation from provincial agencies, licences and tenure holders. Two meetings
11
are held annually. The first meeting consists of reports presented from the members regarding
the previous year’s actions and the development of a work plan for the coming year. The
second meeting held in the fall, consists of a field trip to view works that have been completed
or require updating. In 2012, new range infrastructure was installed at 9 km on the Aberdeen
main, a nose pump has replaced a nose hole at 12 km on the Haddo Main, garbage clean up at
all dams was completed by staff and contractor (removal of makeshift outhouses, abandoned
vehicles and litter) and continued communication with forest tenure (Tolko) and the MFLNRO
(Ministry of Forests Lands and Natural Resources Operations) Roads.
In 2012, there was a fire south of Aberdeen Lake (Spec Lake area) that started at 17:00 August
27th. There are a number of cut blocks in the area so there were enough road networks to fight
the fire. MFLNRO is aware that Duteau Creek is a Community watershed so the fire crews were
instructed to:
1) be light hand on the land;
2) use no foams or surfactants;
3) keep heavy equipment out of riparian areas and wetlands;
4) use bucketed water from lakes - no fixed winged planes in use; and
5) use no further retardant – some was used initially to protect the riparian corridor.
A Material Safety Data Sheet (MSDS) was provided to water quality staff as there was some
retardant that entered a small water body near Aberdeen Lake. Water Quality tested for iron,
ammonium, and phosphate AT Aberdeen Outflow for any changes. The fire was less than 50
hectares.
Figure 6: Aberdeen Plateau Fire 2012 – Spec and Aberdeen Lake area
On November 16, 2011, the RDNO Board of Directors passed a resolution endorsing the
Source Assessment of the Regional District of North Okanagan – Greater Vernon Water Utility
North Kalamalka Lake Intake Report, prepared by Larratt Aquatic. The endorsement of the
report has provided GVW staff with the ability to move forward with a Kalamalka Lake
12
Watershed Protection Response Plan. In June 2013, this process will have its initial meeting to
focus on Coldstream Creek as the primary water inflow source to the lake.
GVW received a 2012 Water Conservation and Quality Improvement grant from the Okanagan
Basin Water Board (OBWB) for some Coldstream Creek riparian protection projects located on
Coldstream Creek Ranch and DoC lands. The estimated cost of the project was $25,400.
RDNO provided $10,000 of funding through the OBWB grant, Farmland Riparian Interface
Stewardship Program (FRISP) provided consulting services ($2,040) and Coldstream Ranch
covered the balance ($13,340). These totals do not include the labour or materials to fence the
north pasture of the Larch Creek (King Edward Road) site, the time summarizing the projects
and drafting subsequent reports. The full report is located on the RDNO website www.rdno.ca Greater Vernon Water/ Watershed/Source Assessments and Protection.
MONITORING PROGRAM
The GVW Water Quality Program references the following legislation, regulation and guidelines
to develop a Reporting and Monitoring Plan.
1.
Guidelines for Canadian Drinking Water Quality (GCDWQ)
2.
British Columbia Drinking Water Protection Act and Regulation
3.
British Columbia Approved Water Quality Guidelines (Criteria)
The Water Quality Program is designed to monitor weekly and monthly variations in water
quality and provide statistics for yearly trending.
GVW water quality staff monitors the source water in the watersheds, at the intakes and at the
wellheads. At this time there are five (5) surface water intakes and one (1) ground water well.
The source water quality monitoring is an important component of the multi-barrier approach to
drinking water management. It is important for monitoring programs to be as comprehensive as
possible. The source water quality program compares source water with guidelines, criteria and
regulations that have been set for both health and aesthetic reasons. The program also
observes seasonal trends that may affect treatment and chlorine demand and monitors for
potential threats from watershed land use practices.
The distribution system monitoring program incorporates certified operators from the CoV and
DoC to sample at designated sampling sites. During regular operations there are two distinct
water systems (Duteau Creek and Kalamalka Lake) where dedicated sample sites are
monitored. This portion of the water quality program is designed to meet the community water
system regulations prescribed by the British Columbia Drinking Water Protection Regulation
(Drinking Water Protection Act) Schedules A and B. Supporting the design is also the Canadian
Drinking Water Guidelines which provide levels set for health reasons, Maximum Acceptable
Concentrations (MAC), and Aesthetic Objectives (AO). Other parameters may be monitored if
they are known to create problems within water distribution systems.
GVW also manages two small water utilities that are stand-alone water systems, the Outback
and Delcliffe. These systems have their own intake from Okanagan Lake. The Outback uses UV
disinfection treatment and chlorine and Delcliffe uses chlorine disinfection.
Drinking water quality is a function of source water quality, water treatment, and water quality
changes after treatment. As a result, the monitoring of drinking water quality consists of three
(3) components:
13
1.
2.
3.
source (raw) water monitoring
monitoring after treatment (at outflow of treatment plant)
monitoring the distribution system
For more information regarding testing parameters and MAC levels, please visit Health
Canada’s website at: http://hc-sc.gc.ca/ewh-semt/water-eau/drink-potab/guide/index-eng.php.
Source and treatment testing parameters
Raw water (untreated) testing for 2012 was completed in the following areas:
−
Duteau Creek Watershed
−
Kalamalka Lake intake
−
King Edward Watershed
−
Deer Creek intake
−
Goose Lake
−
Okanagan Lake (Outback)
−
Coldstream Ranch Wells.
There were a total of 4,048 tests performed using 107 different water quality parameters on raw
water in 2012. Water Quality analysis is reported in Appendix 1.
Turbidity
Turbidity measurements relate to the optical properties of water. Turbidity is caused by
suspended matter such as clay, silt, finely divided organic and inorganic matter, soluble
coloured organic compounds, plankton, and other microscopic organisms. Excessively high
turbidity can have a negative effect on disinfection techniques.
Canadian Drinking Water Guidelines apply to individual filter turbidity for systems that use
surface water or GUDI (Groundwater under Direct Influence). In the spring of 2006, Interior
Health (IH) introduced the Turbidity Education & Notification Campaign for unfiltered water
systems to inform customers that health risks increase as turbidity rises (particularly for at-risk
populations people with weakened immune systems); and to notify customers of turbidity levels
higher than 1 Nephelometric Turbidity Units (NTU).
At this time, GVW does not have filtration on any of its sources but the enhanced treatment at
the DCWTP provides turbidity reduction therefore the outflow water at the DCWTP reservoir
cannot exceed 1.5 NTU. The MHWTP with UV disinfection cannot exceed 3.5 NTU. GVW is
investigating filtration deferral and or filtration options in the Master Water Plan update 2012/13.
Turbidity is continuously measured at water supply sources. Kalamalka Lake, Duteau Creek, the
Outback, Goose Lake, King Edward and Well #1 all have on-line turbidity meters and are
monitored by SCADA. If the water supply source is being used, a comparison with a hand-held
turbidity meter is completed weekly at the site to insure the meter is reading correctly.
The water distribution system is monitored weekly by operators and water quality staff. When
unacceptable high turbidity test results are recorded, the system is monitored and flushed or
investigated further. Monthly water quality reports and the “GVW, Water Quality Deviation
Response Plan” provide further details with regard to turbidity events and/or trigger levels for
response and notification.
14
The Turbidity Index is updated at midnight daily and is available on the RDNO website:
http://www.rdno.ca/index.php/services/engineering/water/greatervernonwater/notifications.
The Index is calculated by averaging 24 readings in a day. In 2012 the Turbidity Index reported
the 24 hour average from the MHWTP before ultra violet disinfection and at the DCWTP
Reservoir before entering the distribution main. The collected 2012 turbidity data is located in
Appendix 2.
Chemical Analysis
GVW staff takes samples on an annual basis from all water sources before treatment or
disinfection for a “comprehensive sample” chemical analysis of common minerals and other
chemical parameters (such as hardness). Results are checked against the Guidelines for
Canadian Drinking Water Quality (see Appendix 1 and 3).
A seasonal and weekly schedule has been implemented to test chemical and physical
parameters at each water source. The analysis may be completed in the field, at the GVW lab,
or at a certified lab. Other parameters (ammonia, nitrites, and nitrates, pesticide scans,
hydrocarbon scans and volatile organic compounds) may be included in the analysis when
specific concerns arise.
Treatment testing parameters
DCWTP includes coarse screening, FLOC, DAF and disinfection with sodium hypochlorite
generated on site. The DCWTP operators complete the following sampling and analysis, as
shown in Table 7.
Table 7: DCWTP Analysis Frequency
Raw Water
Daily
Weekly
DAF Basins
Daily
Analysis
Turbidity, Temperature, pH, Conductivity, Alkalinity,
True Colour, Online DOC meter.
Total Aluminum
Turbidity
DAF Effluent (Before Chlorination)
Analysis
Daily
Twice a Week
Reservoir Effluent
Daily
Turbidity, pH, Alkalinity, True Colour
Dissolved Aluminum
Chlorine Residual, pH, Turbidity, Temperature
GVW staff also completed additional weekly sampling at the point where the Duteau Creek
water enters the distribution system. In 2012, there were a total of 39 different parameters
tested and 719 individual analyses completed for this site.
The MHWTP includes pre-chlorination in the wet well, UV disinfection and post disinfection with
sodium hypochlorite generated on site. Chlorine and UV Transmissivity is monitored on-line.
Weekly samples are analyzed at the GVW lab for both filtered and unfiltered UV Transmissivity.
A sampling site is located after disinfection to monitor the presence of bacteria weekly. There
were a total of 25 different parameters tested and 783 individual analyses completed before
15
water enters the distribution system. The operators performed and documented daily plant
checks plus operational changes and maintenance.
Distribution testing program
After treatment and/or disinfection, the water quality program is designed to meet the BC
Drinking Water Regulations and Guidelines for Canadian Drinking Water Quality. Additional
parameters may be monitored if they are known to create problems within water distribution
systems.
The locations for distribution sampling are determined by both GVW and IH. The monitoring
program is designed to capture changes in water quality as it flows through the pipeline (i.e.
Flow patterns in the water distribution system).
Duteau Creek supplied system
 Total sites : 34
 15 % high flows or main transmission lines
 41 % medium flow
 24 % low flow
 20 % dead-ends, un-looped lines and stagnant areas.
Kalamalka Lake supplied system
 Total Sites: 30
 17 % high flows or main transmission lines
 27 % medium flow
 30 % low flow
 26 % dead-ends, un-looped lines and stagnant areas.
At this time, there are 64 sampling sites throughout the GVW distribution system. The preferred
connection for dedicated sampling sites is directly to the Main water line for a number of
reasons. Public buildings or residential homes may be inaccessible and/or results may not
always be reliable. If a sample line cannot be run continuously, it should be a suitable size to
allow water from the Main to reach the tap after a brief flush. Sampling sites will be re-evaluated
as the GVW program evolves. New sampling stations were installed in 2012 and additional
sampling stations will be added in 2013.
Figure 7: Sampling site and station
16
The water quality monitoring plan has divided the sampling sites into a four week schedule for
the operators of the CoV and the DoC. The schedule rotates the sampling sites from week to
week to assist in a weekly overview of the entire water system.
GVW as the drinking water purveyor serving a population of approximately 53,000 is required to
test a minimum of 61 bacterial samples per month as outlined in the Guidelines for Canadian
Drinking Water Quality, Sixth Edition. Tables 8 and 9 provide an overview of how the bacterial
sample numbers are calculated and scheduled.
Table 8: Bacterial Samples per population
38,000
15,000
< 300
< 300
No. of
sources, or
intakes
1
3
1
1
No. of
sample
sites
28
30
1
3
53,000
9
55
Distribution System
Population
(approx.)
Kalamalka
Duteau
Outback
Delcliffe
Total 2012
Minimum Bacterial
samples per month
38
15
4
4
61
Table 9: Weekly Bacterial Schedule
Sample
Week
1
2
3
4
Total
Kal CARO
10
10
14
7
41
Kal P/A or
MPN
5
5
7
7
24
Duteau
CARO
6
3
8
10
27
Duteau P/A
or MPN
10
10
8
7
35
Delcliffe/
Outback
5
1
2
1
9
Bacteria samples are prepared, collected and shipped as prescribed in Standard Methods for
the Examination of Water and Wastewater (21st Edition 2005). Water is placed in a sterile bottle,
sealed, identified by location with time of day noted in a chain of custody, placed in a cooler,
and delivered to a certified laboratory for testing (Caro Environmental Services in Kelowna)
weekly. The certified lab utilizes the membrane filtration (MF) method for detecting Total
Coliform and E.coli bacteria. The GVW lab also completes a minimum of 49 bacterial samples
using the Colisure® and Colitag® methods for the presence/ absence (P/A) or Most Probable
Number (MPN) of Total Coliform and E.coli. In total there are at least 102 bacterial samples
analyzed per month.
If the bacteria results for the water distribution contain Total Coliform or E.coli the operators and
water quality staff are instructed to complete:
1)
2)
3)
4)
Further testing to confirm the previous test results
Water Main flushing to remove stagnant water
Further measurement of disinfection levels after flushing
Investigate further for water quality changes in the distribution or source to determine if
contamination has been introduced via a cross connection or outside source
5) Issue a Information Bulletin/ Water Quality Advisory / Boil Water / Do Not Drink or Do
Not Use Notice if there is a health risk identified. (Table 11 provides notices for 2012.)
17
Some sample sites are specifically located to monitor the extremities of the water system which
may have low flow or stagnant water conditions. The intent of these sites is to ensure no
biological re-growth is occurring. When water quality factors such as turbidity and temperature
are higher than other sites in the distribution system, or the free chlorine (chlorine that is
available for disinfection) falls below 0.20 mg/L, and/ or the presence of total bacteria or
background > 200 colony forming units/mL occur, solutions including re sampling, increasing
chlorine or flushing the water main to refresh the water supply may be instituted.
The health and safety of our water system and public trust in it are issues GVW takes seriously.
GVW staff work closely with IH to establish a program that ensures our citizens are provided
with safe and healthy drinking water.
Bacterial test results
The Guidelines for Canadian Drinking Water Quality and the British Columbia Safe Drinking
Water Regulation have established the following microbiological criteria for drinking water
distribution systems:
- No sample should contain more than one Total Coliform organisms per 100 ml, none of
which should be E. coli;
- No two consecutive samples from the same site should show the presence of Coliform
organisms; and
- At least 90% of the samples must have zero Total Coliforms per 100 ml.
In the table below a detailed summary of the bacterial testing and results are shown for the
GVW distribution system.
Table 10: Bacterial Summary
2012 Distribution Bacterial Sampling Summary
Number of Bacterial samples
Method of analysis
Duteau Creek
Kalamalka
451
461
MPN/ P/A at GVW Lab
0
0
MPN/ P/A containing E.coli
0
4
MPN/ P/A containing Total Coliform
100%
99.9%
% of samples with zero Total Coliform
Membrane Filtration(MF) at Certified Lab
MF analysis containing E.coli
MF analysis containing Total Coliform
% of samples with zero Total Coliform
232
0
1
99.9%
499
0
3
99.5%
2012 Total Bacterial Samples
2012 Total Bacterial samples containing E.coli
utilizing MF and MPN/ P/A
2012 Total bacterial samples containing Total
Coliform utilizing MF and MPN/ P/A
2012 % of samples with zero Total Coliform
Method of analysis
Samples with >10 Total Coliform /100 mL
683
960
0
0
1
7
99.9%
Duteau Creek
0
99.3%
Kalamalka
3
18
2012 Distribution Bacterial Sampling Summary
Number of Bacterial samples
Occasions where consecutive samples with
0
0
Total Coliform count (MF)
Occasions where consecutive samples with
0
0
Total Coliform Present (MPN/ P/A)
In 2012, GVW met the guidelines for percentage of samples that must have zero Total
Coliforms per 100 mL in both water systems. There were no consecutive samples with Total
Coliform. Further discussion on historical bacteria monitoring in the water distribution system is
located in Appendix 3.
EMERGENCY RESPONSE / NOTIFICATION
RDNO engineering staff, the CoV and DoC operators are all instructed on how to use the
following supporting documents in times of water quality changes or emergencies:
1)
GVW Emergency Response Plan
2)
GVW Quality Deviation Response Plan
The above documents contain the contacts, criteria and procedures necessary to assist
operators and staff to make timely, informed decisions.
Water Quality Notification
In 2012, the turbidity at the Kalamalka Lake intake went over the 3.5 NTU on two occasions.
GVW and the operations were able to avert a Boil Water Notice by turning off the Kalamalka
Lake source and utilizing the Duteau Creek Water treatment plant to serve the whole GVW
water system. This occurred on April 27th until May 8th and then again from June 8th until June
11th, 2012 for a total of 16 days.
Two types of notices were delivered to GVW customers in 2012 as shown in Table 11.
1)
2)
Information bulletin - released when there is no health impact to the customer but
provides information about changes in the water quality or supply.
Boil Notice - released when there is a known or a possible health impact to the
customer.
Table 11: Notification Summaries
Type of
Notice
# in
2012
Information
Bulletin
4
Dates in effect
Kalamalka Lake
Apr. 27-May 8
Kalamalka Lake
Jun. 8-Jun. 11
Root Cause and Actions
Turned off due to high turbidity – water
supplied to customers from DCWTP.
Customers asked to limit outdoor
watering.
Turned off due to high turbidity – water
supplied to customers from DCWTP.
Customers asked to limit outdoor
watering.
# of
Customers
affected
35,000
35,000
19
Duteau Creek
Nov. 5–Nov. 8
Duteau Creek
Nov. 27
Boil Water
Notice
Delcliffe
Planned DCWTP shut down for reservoir
works.
Water Interruption and Low Water
pressure – emergency water main break
15,000
200
1
Aug. 11, 2011Jun. 18, 2012
Repairs to intake, chlorine injection and
reservoir.
<100
GVW must inform customers when their drinking water is not safe to consume or use. An
Information Bulletin or Notice will be issued specifying the cause and what measures the
customer should take to reduce any risk to health. The Information Bulletin /Notice is delivered
as quickly and as efficiently as possible. Notification may include “Alert” road signs, radio
and/or media releases, email to sensitive institutes (hospitals, care facilities, and schools),
commercial (restaurants, breweries) and individuals; and in some cases notification may be
hand-delivered.
CUSTOMER CALLS AND RESPONSE
In 2012, water quality staff responded to 45 customer call outs requiring home/business site
visits. These customer concerns included: taste, odour, and colour issues, particles in water,
and residue or sediment in toilets or on appliances. Sample results are reported back to
customers as soon as possible. Water quality staff also received over 50 water quality inquires
about the water parameters such as hardness, fluoride and colour, where their water comes
from or if there were any notifications in place.
CROSS CONNECTION CONTROL PROGRAM
A Cross Connection Control (CCC) Coordinator staff position was created in 2011. This
position was integrated with the Water Sustainability Coordinator position to take advantage of
opportunities for public education on CCC risks in addition to water conservation education
efforts. The CCC program was reviewed by the Water Sustainability Coordinator and it was
determined that the CCC program required greater integration with the work of Building
Inspections staff to reduce duplication in the plumbing design review process and encourage
greater oversight of new construction and renovations for mitigating cross connection risks. At
the end of 2011, GVW created a half time position for a CCC Officer (with a background in
Building Inspection) to support the CCC Program.
Figure 8 illustrates the change in how many customers have been surveyed for CCC risks since
2008 and how many have been confirmed as compliant with the requirements of the program.
There has been a steady increase in the number of compliant customers, with a significant
increase in 2012 following the increase in staff support for the CCC program.
20
Figure 8: Cross Connection Compliance Progress Report
Customer cross connection risk level is classified on the horizontal axis as High, Medium, or Low.
WATER CONSUMPTION
Water consumption within the GVW service area is monitored at the point of entry into the
distribution following treatment (outflows); this reflects the total water drawn from the Duteau
Creek, Kalamalka Lake, Deer Creek/King Edward Lake, Groundwater, and Okanagan Lake
sources. These data provide the most complete picture of water consumption as they include
any water not captured by meters - leaks, fire flows, and water main flushing. Table 12
summarizes the water consumption measured by meters as compared to the total recorded
outflows for 2012.
Table 12: Comparison of Total Water Produced (Outflow) to Metered Consumption
Water
Consumption
in 2012(ML)
Total Domestic
Consumption (ML)
Total Agricultural
Consumption
(ML)
Total GVW Metered
Consumption (ML)
Total Recorded
Outflows from
Sources (ML)
Metered
Consumption as a
% of Total Flows
5,719.69
5,985.97
11,705.66
18,811.95
62 %
*The unaccounted for water volume is calculated by subtracting the total metered water
consumption from the total outflows from all sources (22,440 ML). This category includes water
utilized for fire fighting and water main flushing in addition to leaks within the distribution system.
GVW is working with operations staff to better understand the volume of unaccounted for water.
21
Domestic
Water
Consumption
48%
Agricultural
Water
Consumption
52%
Figure 9: 2012 Total GVW Domestic and Agriculture Metered Water Consumption
Other
0%
Commercial
34%
Residential
48%
Multi Family
18%
Figure 10: 2012 CoV Water Consumption by Customer Type
22
Figure 10 is a chart that divides the 2012 water consumption in the CoV by customer sector.
Other jurisdictions are not included as their billing systems don’t classify customers by sector.
WATER SUSTAINABILITY AND DEMAND SIDE MANAGEMENT
To improve water demand side management and customer engagement, the following
programs are in place.
Water Consumption Data Analysis
GVW staff had the opportunity to focus on long term planning and program development in
2012. Metered water use analysis found that agricultural water demand captured the majority of
water consumption even in a relatively wet year (Figure 9). Figure 10 illustrates the breakdown
of water consumption amongst City of Vernon domestic customers and GVW Parks irrigation.
In recognition of the large role residential water consumption plays in driving domestic water
demand, programs have focused on this sector. Staff completed extensive data analysis and
review of current best practices to determine which programs and policies will improve
residential water efficiency. The key area of focus is outdoor water use and in particular, the
landscaping and irrigation practices that drive inefficiencies. Research has shown that even in
areas where landscape standards bylaws have reduced lawn size, properties are still using
more water than necessary due to poor irrigation management.
Domestic Tiered Water Rates
Staff developed and distributed an educational fact sheet describing the 2012 rate structure to
all domestic customers served by GVW via their April utility bill. The bill stuffer also noted the
new agricultural water rate structure for water consumption over a customer’s allocation. Staff
have been actively working with customers throughout the year to ensure understanding of the
rate structure and helping those who have transitioned from the agricultural water rate to the
domestic rate.
Education Programs
Staff presented several workshops to adults and youth and public events over the course of
2012. These included booths at the Thursday Farmer’s Market, Adopt-a-Stream Clean Up
events, and water conservation/watershed ecology demonstrations to schools. The three
largest events were: How to Build a Rain Barrel Workshop, Drinking Water Week, and
Environment Week. A very well attended Outdoor Water Conservation Workshop was held at
the Xerindipity Garden at Polson Park in June. Over 80 people attended the “How to Build a
Rain Barrel” workshop, where 20 barrels were given away. This workshop and giveaway was
funded through a $4,600 grant from the OBWB. Printed instructions and a video have been
posted online at http://www.rdno.ca/index.php/services/engineering/water/water-conservation.
In celebration of B.C. Drinking Water Week, three (3) days of tours were held at the Duteau
Creek Water Treatment Plant. The tours were sold out with a total of 78 people attending.
Staff participated in public events during Environment Week, June 3 - 9, 2012, jointly sponsored
by the CoV. This week included the Inquisitive Clips Film Competition, which featured water as
the contest theme. Seven films were submitted and the screening saw an audience of over 100
people and the films were also part of the Environmental Leadership Awards event. The films
have been screened as part of the Okanagan Science Centre’s year long Water Works exhibit
and are also being promoted on the OBWB’s YouTube Channel.
23
Utilizing a 2012 OBWB grant, staff developed a project plan to initiate a program in 2013 to
assist high water consumption customers to improve their water use efficiency. This project, the
Landscape Irrigation Assessment Program, will offer in-person assessments of a customer’s
yard to help identify ways to improve water use efficiency. The assessments will be offered to a
select group of homeowners based on their past water use to ensure the information reaches
the customers who would benefit the most. Based on training completed in 2012, a Guidebook
was developed for staff to complete the assessments, along with a booklet of personalized tips
to provide to the customer following an assessment.
Communication
In cooperation with the OBWB, a media campaign to promote outdoor water efficiency
Okanagan Basin-wide was initiated. The campaign, called “Make Water Work”, includes
posters, billboards, newspaper, online, and radio advertisements - more information can be
found at www.okwaterwise.ca. This campaign has been useful to staff as materials are
developed by the OBWB and will help encourage a consistent conservation message across the
Basin.
A communications strategy was developed for GVW in 2012. Staff determined that a
professional review of current communications activities was required to ensure the most cost
effective use of funds. This strategy has identified the key communications tools needed to
keep customers informed about GVW operations as well as programs to encourage water
efficiency and will be used to inform 2013 budget plans.
Long Term Improvements
The Master Water Plan Update (June 30, 2013) will provide GVW with direction for long term
improvements and capital planning to achieve full compliance with the Drinking Water
Protection Act and BC Drinking Water Treatment objectives.
CONCLUSION
GVW has made significant strides in implementing BC’s Drinking Water Protection Act and
Regulations. While there remains ongoing work to do, GVW, in conjunction with the CoV and
DoC continue to work hard to ensure the highest quality standards are met for the safety and
reliability of the water delivered to our customers.
GVW is pleased to present the 2012 Annual Water Quality Report, detailing the health and
direction of our water system. If you have any questions about this report or want more
information about water consumption and production, please contact Greater Vernon Water at
Tel: 250-550-3700 or email [email protected].
24
APPENDIX 1
SOURCE (RAW) WATER COMPREHENSIVE ANALYSIS
25
North Kalamalka Lak.e Intake Quality 2012
Sampling Point :
Kal L ake Intake
7 f17J2012
Date·
(6~1-SR, 5EDD~
Dnnklna Water- Guldehnes
Maximum Acceptable
Aesthetic
Concentration (MAC)
Objective (AO'
no current guideline
< 0. 1
<£Ul06
<O.Or1
r-~"--'•an
Results (mgn... unless
noted}
INORGANIC
[Alumin um (torta_l)
<(1_0.5
IAnti:mony Ctatal)
IAJfs enic 1(total~
Bariu m 1(totaiJ
<(1 .00 1
< 0 .005
< O.D5
<(JJ)4
Boron (total•
Cadmium Ctota'll
Calci um (total)
< 0 .000 1
391
7 .05
<(1 .005
Ch l oride
Chromium i(tlotal~
Co,pper Uota'l)
Cyanide (tatal)
FluoTide
Iron (rofal l
lead ttotal)
Magne-sium ltlotal)
Manganese (tota l)
< 0 .002
< 0 .0 1
o _18
<(1_10
<1
<5
<£HJ05
<25(1
4 105
< 1.0
<(] .2
< ,.5
<0.30
<(].0r1
Mercury ttotal)
Motybd'e;num (total}
< 0 .00 10
20.4
0 .007
< o .m:m:m
0 .005
Nitr afi!. Gas. N)
Nitr ite fa.s N)
Potassium (robQ
Se,l'e nium ttorta l}
0 .066
< O..Oil
5 .6
< O.OD50
<1 LIJ mg/L as N
< 1 mgtL as N
Sodium Ctotal)
S ulphate
u.-.an'i urn ltorta l)
IZinc (forta_l)
11 8 .5
54.3
0 .0032
<(1 .040
Results (mgn... unless
noted}
PHYSICAL
Allil.a1in ify (tofal , as
CaC03)
Co1'ou.-
146
Conductivitv
Har d ness Ctorta I, as
CaC03)
loH
T ofa11dis.s o'lved solids
~ TDS
T u rb idity
rii'O CUJI'R!'flr
< 5TCU
4 00
<0.05
<(]J)01
no cunrent guideline
no currenl gLM eune
<U .U'l
<llltl
~u
<U .UL
<5.0
Maximum Acceptable
Concentration (MAC)
Aesthetic
Objective
no current g uideline
<1 5TCU
no currem. Qllideline
1B2
see note
a_t Q
6 .5-8.5
234
'1. 1
1 N IU
,..... , ... ,......, nearm ·
Han:Jhess- .no ~- ~ Levels bettJ;.."'Efl 80 and :roo mg.t. as CaCo3 art'! CtC:Iruidered
aocepta ~ l ev~ greatef' than :200 ~ reonsid~ pori" tu: can be- tderated;
those iD ex ces.s of 5@0 are notrrJ<:fiJY.I comiclered U'laCCetlfiible.
-
(AO~
<500
<t. N I U
~
Figure 11: Raw Water at North Kalamalka Lake Intake
26
..
....
~1 2
1!1-......,.. 12
17- - 12
~- ·2
~ ·-- ·2
1.1'-
112
14-f'-=- •~
___.,
~..r-·~
I9 =r§ p
..
fi. . i. ..iil . 1!~.,. !;i -~ !,....
""
.... mJ
'""'
"", ...., .....,
Hll
....,
••
""" 1 92
1111
••
~·
~
~
::®:1
:1..141
-
1 . 11
~~
:).!I)
50
I .U
:).15
1 1>
"'"
"""'
ti-l'-·~
2.10
5-11•~ 2
13-A.I•· I1'
:L...
_.,
"""
20-11•·12
:!J'..jj(• • J'2
l ei
~ 1 -1 :;!
~ 12
, ,;,
"'"
17- -12
ti-Nl-r- 12
,.
!-NJ,-12
1 SO
~-NJ,- 12
1 ~
~ 12
"'"
>.11
~ ~·
I '"
.,.
,,. ..,
e..""
,. ,.
I!W
1~
2t-tbt-12
~
.....
1~
'!:.-.li.- 12
1 ~ 12
11...._.,:;
1 AO
1 .Y
1 T.II
1 rJ.
1 J!ll
1 .e.<
2~ 1:2
:31 ...U.12
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Figure 12 : Raw Water at Kalamalka Lake Intake monthly Tabular of parameters
27
Kalamalka Lake Raw Water Summary
Physical–chemical (Figures 11 and 12)
All the physical and chemical parameters were well within the Canadian Guideline limits. The
Kalamalka Lake water hardness is considered hard with a Total hardness of 182 mg/L as Caco3
Bacteria in Source Water (Figures 13 and 14)
In 2012, the level of Total Coliform increased in February but then stayed low until September.
From October thru November the water temperature was warm (14 C) and Total Coliform
numbers trended higher (possible lake turn over). There was some correlation with the turbidity
in Kalamalka Lake and bacteria numbers both Total Coliform and E.coli at two different times in
2012. Rototilling for milfoil control was in progress in January and February. GVW has noticed
an increase in E.coli counts at the intake (raw) water at this time. The E.coli trending stayed
below the 20 E.coli Filtration exclusion rule until September. Bacterial source tracking at the
existing Kalamalka intake and the extension of the intake to a deeper depth are being
investigated to under stand ways to improve the raw water.
Turbidity (Figure 15)
In 2012, the turbidity went above 3.5 NTU on two occasions. A heavy freshet caused two
turbidity events on April 27 – May 8, 2012 and on June 8 - June 11, 2012. The Kalamalka Lake
source was turned off and GVW used DCWTP to supply the entire water distribution. The
January and February increase in turbidity was linked to rototilling for milfoil control. GVW is
working with the OBWB to minimize the impact to GVW operations and determine the best
solution for both parties.
Seasonally, the turbidity rises in late July as the lake “marls”. Marl precipitation occurs in
Kalamalka Lake because of its naturally high calcium and sulphate concentrations. The “marl”
creates the color in Kalamalka Lake. The timing and the intensity of the color varies from year to
year due to the fluctuations in water chemistry, water temperature and algae growth. The marl
precipitation helps Kalamalka Lake because it co-precipitates phosphorous. As soon as the marl
occurs, usually in July, phosphorous drops and algae production declines. (Kalamalka Lake
Water Quality Study, Larratt Aquatic Consulting, 2003). The 2012 Turbidity Statics for
Kalamalka Lake is located in Table 13.
Total Organic Carbon (TOC) (Figure 16)
Measures dissolved and suspended carbon bound in organic molecules and organisms. Both
Chlorophyll-a and TOC are affected by micro flora density, the monthly TOC is correlated with
chlorophyll-a. This is important as the MHWTP has UV disinfection and no filtration. The BC
Water Quality Guidelines for Organic Carbon in drinking water supply with chlorination is 4.0
mg/L. http://www.env.gov.bc.ca/wat/wq/wq_guidelines.html.
28
Figure 13: Raw Water at Kalamalka Lake Intake Total Coliform and Water Temperature
Figure 14: Kalamalka Lake Raw Water at Intake E.coli and Filtration Exclusion Rule
29
Figure 15: Kalamalka Lake Raw Water Turbidity at Intake and MHWTP
Figure 16: Kalamalka Lake Raw Water Total and Dissolved Organic Carbon mg/L VS Chlorophyll-a
30
Buteau C..-eek Water Quality 2012
liiNdgates Cl2 Ill ~ [1 -1-s R.. 5E6D.
.Samp lf.ng Poblt
Date o f .S3mple -
-
7~17 '-20 12
canadian Dnnking Water G u idelines
Results (mgiL unless
INOR GANIC
noted~
0 . 17
<0.00 10
< 0 .01}50
< 0 .050
<0 .040
<0.000 10
7
0 .73
<0.005(1
0..035
< 0 .0 1
< 0 .10
0 .3
<0.00 10
1.7
0 .02Q
<0. 00020
<0.00 10
0 .0 1 6
< 0 .0 1
5 .7
< 0 .01}50
33.2
3 .6
0 .0032
<0.040
Aluminum 1
( tota.J)
Antimony r( total)
Arsenic Uotal)
Barium (total)
Bor-on (total)
Cadmium (total)
C a l cium Ctlotar•
Chloride
Chr-omium (totaU
C.opper Ctotal}
Cyanide 1{total)
F luo ~ride-
I ron 1(total)
L ead! (to-taU
Magnesju:m (total)
Man ganese CtlotaT)
Mereurv ltotar~
Mo!lybdenum Cto1!al)
N itrate 1[azs N )
Nitrite (as N)
Pofazssium ~~ta'l)
Sel eni um 1(total)
Sodium 1( tobl)
Sul phate
U ran i um ~tal)
Z i nc (total~
P HYSICAL
noted~
Alkalinity (Total, as CaC03)
20
C·o l our
Cond uc,tivitv
69
Maximu m Acceptable
ConcentJration (MAC)
n o current g u id elin e-
Aesthetic
Obj ective (AO)
< 0.1
0 .006
< 0 .0 1
<1
<5
<0.005
no cun-ent g u id el in e-
<250
<0 .05
< 1.0
<0. 2
< 1. 5
<0.30
<0 .0 1
<0.05
<0.00 1
< 1 0 m.gl l as N
< 1 m gfL as N
no curre nt g u id e'line
<0 .0 1
<200
<:500
<0 .02
<5 .0
Maximu m Acceptable
Concen bration (MAC)
Aesthetic
Obj ective (AO)
n o curre nt g u id e'lin e
Hardness
{tobl~
51
azs
< 15TCU
n o current g u id e:Jin e-
23.7
CaC03 ~
pH
7 .54
"f otal d i ssol ved solids f TDS
27.6
1. 1
Turbi dity
Hoxes.
see
ncr~e
tL5 - 8 .5
<:500
1 NTU
<5 NliU
HCJ ct:m1IOI' GI:JJi:Milmlil : RBI\Jl'BI'JCII' HaaM canacta
"H:iii:J'II?.s:s Le"l eJ.slle:tiM?Efl fiO ~ lOOfflP-~ as CGOJ.3 all?~ ;;~;ll!:!,ll(a!lte'; ~
gre;~l!rletl200 arp ~IE'dpoorbU!~
~ rtxJ.se on EXPsss 1'1500 a~e ~~ rnaxep:Sb'.
~-no g~ -
. - r uru IM!en ~
.ce
· ...s N'Jtlal?.:sti'le-~ aar.t:
Figure 17: Raw Water at Duteau Creek Intake
31
Duteau Haddo Wei.- Quality 2012
s:ampnog Potrrt:
Date or sam pre·
ttamoo WilD'
7f.25l20112
Canadian Drinking Water Guidelines
INORGANIC
n oted)
0 _15
<0.00 10
< 0.0050
< 0 .050
<OJJ40
<0.000 10
Aluminum 1(tota'l)
Antimony (total~
Arseni c !( total)
!B arium 1(total)
!B oron Ctotal)
Cadmium (total~
Calcii.Uil Ctotall
O hJoride
Oh.romium 1(1:o tal)
Copper (total~
<Cyanide ' total)
4
Maximum Acce-ptable Aesthetic
Concentration (MAC) Objective (AO)
no current g uiidel'in e-
<0.0 1
<1
<5
<0 _000
no ClJ I"'fE~l QUidefine-
0 _75
<0.0050
<0_002
<0_0 1
<O_'i1 0
0 _4
F~uoride
I ron 1(total)
Lead ttotaJJ
<0.00 10
M~.nes i um 1
(1:ota'l)l
Man!(liUlese (itotal l
IM en:ury ,ttotal)l
Mol)lt:ldel'll!lm (total)!
• rtrate Cas N)
Nit rite (as N~
Potassi1.11m (total1
Selen:ium 1
( totall
Sodium ttotal)
Sul Phate
U ran ium 1ttotar)
Zinc (total,
L'i1
< 1.0
<0-2
<L5
<0_30
<0.0 11
no currem g uidefine<0_05
<0.00'1
no curren'l. g uiidel!ine< 10 m.gtl.. as N
<1 m gl L as N
no clJrrerrt g uiideeine<0.0 1
L4
<2!!10
<500
2.2
<0.0002
< OJJ40
n oted)
PHYSICAL
<250
<0.05
0 _[]4
0 .0004
<0.00 10
CTI.O'II B
<0.0 1
0..5
<0. 0050
Alka li:nity CT otal, as. CaCOO)'
1t
Co:loucCo:nduct ivitv
79
34
14 .2
pH
7 _11
TDS
<0.02
<5.0
Maximum Acce-ptable Aesthetic
Concentration (MAC) Objective (AO)
no current g uiidel!ine-
Hardness !( total, as. CaCOO)
irofal dissolved solids I
<1 5TCU
no ClJrTenl g u idellne-
:see note
6 .:5- 8 .:5
16 .8
1 _'il
T urbidity
< 0 _1
o_ooo
<500
1 NTU
<5NTU
lrio..""ff!S;
No CliYnlnt Guf.:MWtJa :
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· -<0 f'flV OJ!es;t/;"t!tk dol.~
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Figure 18: Raw Water at Haddo Reservoir Weir entering Duteau Creek
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52
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7.8
7.7
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7.47
7.64
11.4
7.9
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11.092
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5
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25
44.194
29.4
53.8
34
Figure 19: Raw Water at Duteau Creek Intake monthly Tabular of parameters
33
41.
42.
44.
45
Duteau Creek Water Quality Summary
Physical–chemical (Figures 17, 18 and 19)
All the physical and chemical parameters were well within the Canadian Guideline limits except for
the summer water temperature (aesthetic objective less than 15C), the Color (aesthetic objective
less than 15 true color units) Aluminum(aesthetic objective less than 0.1 mg/L) and Turbidity
(maximum allowable concentration less than 1 NTU).
Bacteria in Source Water (Figures 20 and 21)
In 2012, the level of Total Coliform increased in March and then remained high until October.
There was some correlation with E.coli and the turbidity at the Duteau intake. The E.coli numbers
increased in March (lower watershed melt) and the end of May and first two weeks of June (upland
snow melt, rain on snow, and upland reservoirs filling and spilled).
Total and Dissolved Organic Carbon (Figure 22)
The Total and Dissolved Organic Carbon (TOC) levels affect the generation of Trihalomethane’s
(THM’s in Figure 18). The graph below shows the organic levels measured at the intake before
treatment 2003 - 2012. Note that in 2010 and 2011, there were some upward trending, peaking on
June 17, 2011 with TOC reaching 79.3 mg/L and the Dissolved Organic Carbon (DOC) at 74.6
mg/L. The carbon levels in previous years seldom peaked above 20 mg/L. In 2012, the levels
returned to previous levels.
Turbidity (Figure 23)
The raw water turbidity at the Duteau Intake (Headgates) went above 1 NTU for 108 days of 2012;
however the turbidity after treatment at the Duteau Creek Water Treatment plant remained below 1
NTU all 365 days of the year. There were 8 days when the turbidity rose above 5 NTU which in the
past (pre-water treatment plant) GVW would have been in a Boil Water for the customers supplied
by this water source. The turbidity peaked due to spring freshet in the lower watershed April 24
and then again on June 10, 2012 when the upland reservoirs filled and spilled.
34
Figure 20: Raw Water at Duteau Creek Intake Total Coliform and Water Temperature
Figure 21: Raw Water at Duteau Creek Intake E.coli and filtration exclusion rule
35
Figure 22: Duteau Creek intake raw water TOC and DOC trending 2008 - 2012
Figure 23: Turbidity 2012 at Duteau Creek intake and at outflow of DCWTP Reservoir after treatment
36
APPENDIX 2
WATER TREATMENT
37
Turbidity Index and Statics
Notification Targets
The following information is gathered from the on-line turbidity instruments at the intakes and at the
point of where the treated water enters the distribution. The daily 24 hr average is used to provide
information on the RDNO website www.rdno.ca.
Turbidity Index
Mission Hill Water Treatment Plant
(UV Disinfection)
Duteau Creek Water Treatment Plant
North Kal
Intake
Mission Hill
WTP
Duteau @
Headgates
Duteau Creek
WTP
Reservoir
Average
1.21
1.00
1.11
0.34
Minimum
0.43
0.26
0.29
0.22
Maximum
95% Percentile
4.04
2.04
3.58
1.66
9.62
2.65
0.66
0.50
Count
Days <1 NTU
Days >1 NTU
Days > 3.5 NTU
Days > 5 NTU
344
116
228
2
0
349
183
166
1
0
365
256
108
14
8
365
365
0
0
0
2012 Turbidity
Statistics
Table 13: Turbidity Statistics for 2012
MHWTP (UV Disinfection)
Ultra Violet Transmittance (UVT) (Figure 24)
The UV disinfection is reported in % Transmittance or Absorption. Measuring UV-light at the
specified wavelength of 254nm measures what the effectiveness of the UV light will be on the
disinfection of the drinking water. %UVT represents the amount of light transmitted through the
water. UV transmittance (UVT) is not turbidity. The water’s clarity is not an effective indicator,
because both solid and dissolved material can absorb UV light. For example, metals (iron) in water
are not visible to the human eye but absorb UV light and have a negative impact on UVT. The UV
Transmittance was above 88% UVT at all times in 2012.
38
Figure 24: UV Transmissivity measured at GVW Lab weekly both filtered and unfiltered
Aluminum (Figure 25)
Both Total and Dissolved Aluminum are measured weekly at the reservoir of the Duteau Creek
Water Treatment Plant. Total Aluminum reflects inherent flocculation carryover from the Dissolved
Air Floatation (DAF) process. Elevated dissolved Aluminum is an indicator of over application of
Poly Aluminum Chloride (PAC), the plants primary coagulant. Figure 25 below illustrates good
control of dissolved Aluminum. Total Aluminum is one of the measured parameters used for WQI,
which is elevated above the aesthetic guideline of 0.2 ppm (part per million) and negatively
impacts the WQI result. Filtration would reduce the total Aluminum below the aesthetic guideline.
This will be explored further during the pilot study, report pending.
Total and Dissolved Organic Carbon (Figure 26)
Dissolved Organic Carbon is measured on line as it enters the plant and tan measured in the
DCWTP Lab by the operators. These numbers are compared with samples taken at both the raw
line into the plant and the reservoir outflow (treated water) for both Total and Dissolved Organic
Carbon. The TOC removal in 2012 was between 51 and 69% averaging 60% Total Organic
Carbon.
39
Figure 25: Total Aluminum at the Duteau Creek Intake (raw) and after DCWTP (treated)
Figure 26: Total and Organic Carbon Raw and treated at the DCWTP
40
Figure 27: DCWTP Statistics for 2012
41
APPENDIX 3
TREATED WATER DISTRIBUTION SYSTEM
42
Kalmalka Water Distribution System
Samplmg p,o int:
Kalamalka Lake
AJIIenby Pumpstation
Date:
1/H J2:0t2
Sot~ roe:
Canadian Drinking Water Guidelines
INORGANJC
Aluminum [total)'
An1irnony (totaiJ
Arsenic total1
Barium Itota~l
Boron (total}
Cadmium ttotan
Cal:aium (totall
Ohloride
Ohromium (total)
Oopper (total)
Cyanide (total)
Fluoride
Iron (total)
Lead , total)>
Magnesium (totall
Man aan.ese ftotan
Mercurv Uotal
Mol~denum total}
Nitrate !as Nl
Niniite (as Nl
Potassium total).
Selenium ltotan
Sodium (total)
Sui'Dhate
Uranium {tota'll
!Zinc ftot.all>
PHYSICAL
Alkalinity (total as CaCOO)
Oo.lour
Oonductivitv
Hardness (total as CaC03),
IPH
l otal dissol ved soHdslTDS
lurbi'd1tv
UV Transmittance @254 (%)
Results {mgll
unless noted)
Maximum Acceptable
Concentration (MAC)
0.06
<{1.001
< 0.005
<0.05
<0.04
<(1.0001
no Cllrrent g;OOeJ1ne
39
no cl.lrrent guideline
27.1
<().005
0.022
<O.o1
1115
<0.10
<0 .0010
20.7
0.005
<().00020
0.005
0.06
0.07
5.7
< 0.0050
33.2
53.2
0.0032
<0.040
Kesuns (mgfL
unless noted)
145
<1.1.11
<UJJU6
<0.01
<1
~
<U.LJU:J
<L!lU
<U.U:J
<1.0
<11.2
<1.!: :1
<0.30
<0.01
no cl.lrrent gOOeJ1ne
<0.05
<0.001
oo current gOOellne
<10mq/l as N
<11mg:/Las N
no curren: gOOellne
<0.01
<200
<500
<0.02
<5.0
IMaxJmum ACCeptal>le
Concentration (MAC)
AesmetJc
Objective (AO)
no cl.lrrent guideline
<1 !: :1 I l:U
< STCU
473
Aesthetic
Objective lAO)
no current gUideline
see note
ti ..!> - 1:!1.!>
183
8.25
~UIJ
268
0.9
9e.2%
1 NTU
<5 NTU
Figure 28: Treated water parameters in GVW Water Distribution System – Kalamalka / MHWTP
43
Dute au Water Distribution System February 201 2
Sour ce:
Duteau1Creek
S·ampling Po int:
P;R V#2
Dat e of Sam ple:
2 11 41201 2
CanadRm Dnnlung Water Gurdehnes
INORGANIC
A l um in um (total)
A!!ti:m.ony _t,t o taJ)
Arseni c ,fto·tall
Barium '( total!
Boro n (total!
Cadm i um jtotal)
Cal c i um (total)
Ch l ori de
Chro m i um 1(total)
Copper l fota l)
Cyani de jtotal )
F l uor i de
hon (total}
Lead ltotan
Magnesi u m l total)
Manganese (tot a'll
Mercury· l total )
Motybde num (fofa'll
N itr ate l as. N )
N itr ite l as N )
Potassiu m (total l
Se'len i um l tota'rl
Sodi um ltotal)
S ulphat e
U r an i um ltotal)
Z inc (tota'f)
PHYSICAL
A l b linity (lio ta'l , as CaC03)
Results (mgll unless Maximum Acceptable Aesthetic Objective
noted)
Concentration (MAC) (AOt
<U. "l
no current guide'line
0 .242
< 0. 00 1
<0. 005
< 0.[}.50
< ().[}4
0J] 06
<0.0 1
<0 _0[}(] 1
<(]_005
6 .7
no current g:tjdeiline
<1
<5
<250
~5
<0. 005
<0.05
<1.0
0 .0035
< 0. 0'1
< 0. 10
< 0. 10
< 0. 00 1
1.46
<0 .0020
<0 .0002
<0. 00 1
0 .07'9
0. 06
no current quideline
L 3.8
no current gt*feline
<0. 005
8.69
3 .6
<0 .0002
< 0.04
<O.DJ1
<0..2
<1.5
<0 .30
<0.0 1
<0 .0 5
<(]_001
no current g;OOeline
<10 n1WL as N
<1 mg:IL. as N
<l(](J
<5m
<(J.ll:l
<!J.U
Resul ts (mgJL. unless Maxi mum Acceptable Aesthetic Objective
noted)
Concentration (MAC) (AO J
14 .3
Co l our
<5
Condu ct ivity
'90
Hardness j tota ll, as CaC03)
22.7
DH
7 . 35
T ofa'l dissolved solids f TDS
45
T u rb i dity
0 .4
no current gtjd:eline
<1 5 TC U
see not e
6 .5 -8.5
1 NT U
<500
<SNTU
t<lotes :
'"" current Gaideli ne ; RefNtmce Health Canada
Hardne ss - no guidetille - "Hardn~ L evels between 00 and 100 mg/1... as Ga Co3 a r'e considered acceptab le; I ENels
greatsr than 200 are con:;:idered poor but ca n be tof.erated; those in ex oe= of 500 a~ nonnally consideTed unacceptabl
T:urbidi!y - 1 NTU whaJ disii JfecliOil reqW-red : <5 NTU a e.s1helic cJan ty
-t Criteria ex Objedive Exceeded
Figure 29: Treated water parameters in GVW distribution system - Duteau Creek /DCWTP (winter)
44
D ute au Water Distribution System July 201 2
D uteau Oreek
Sou roe:
Sampling IPoil'l't:
.
Date ·Of Sample•·
PRV #2
7f17f2:-()12
c:anacllan Unnkmg Water" uul:delmes
INORGANIC
Results (mgiL unless Maximum Acceptable Aesthetic Objective
Concentration (MAC) (AO)
< LJI_,
o_ss
no currerlt gl.IIOeiUle
noted)
!Aluminum {tof:a'rl
!Antimon y (total)
!Arseni c (totan
<0. 001
-<:j0 _01}5
-<:j0. 050
Barium (totan
Bo r o n (total)
Cadmium (total)
Calcium (tota'l)
Ch lonide
Ch r omium ltotan
Coo~>er r( tofall
Cvan ide Ito tal)
Fluoride
Mannesi um ltotall
Manganese jtotal)
Mercury (total)
Mo1'vbdenu:m rf totall
N itrate las Nl
N itrite (as N)
Potassium ltofallr
<0.04
~
<l!J.ut.Ja
<0.01
L 1
<0. 01}5
10.7
Sele,nium ltotan
Sodium (tota'l)
Sulphate
<0.0 1
<1
<0.000 1
7
HUl
< 0. 01}5
(L006
<0.01
<0. 10
<0. 10
< 0. 001
1 .7
0 . 0 13
<0.0002
-<:j0. 001
(L023
lr on ltotaU
Lead rttotan
U .UI.Jtj
no curretlt gl.IIOe iUle
<:250
<U.lb
< 1 .U
<0.2
< 1 .~
<U.;;5U
< 0 .01
no current guide line
<UJ.l~
< U..001
no current gu 10e 1 ~ne
< 1 0mg/L as N
< 1 mgtL as N
no current gu10e i1Jle
< 0 .0 1
<200
~Ul!J
3.2
<0.0002
<0_()4!
Urani um ftotall
!Zinc r[t otall
<U.U"..l
<:5.0
Results (mgiL unless Maximum Acceptable Aesthetic Objective
Concentration(MAC) (AO)
PHYSICAL
noted)
!Atkal inilly (iliota'l~ as C.aC03)
14
Co lou1r
Conductivity
<5
108
Hardness
(total~
as C.aC03)
IPH
!Tota'l dissolved solids f T OS
24
7 . 3:5
52
< 1 !> I C:U
see note·
t:i . ~-oi:S. ~
<500
1 NTU
<5NTU
Turb'id 'itv
0 .7
t<lotes:
No •C UTR"nt Guideline : Reference Heackh Canada
Hara'ne~~ - no guideline - "Hardncess !..eva.s beiween 80 aoo 100 m9"l. a.s C,; Co3 are consjdered accepta ble; leveJ
greater than 200 are co~idered poor b ut can be rolerafed; lho:se in exce~ of 500 af e norma.IYy con.:sidered 1maG>C1
Twbidifl/- 1 NTIJ .me.n disinrecJion required; <5 N TU ,;esihelicclarity
• Criteria or Ob~e E-xceeded
Figure 30: Treated water parameters in GVW distribution system - Duteau Creek /Duteau Creek WTP (Summer)
45
GVW Distribution Summary
Kalamalka / Mission Hill Water Treatment Plant
Physical – chemical (Figure 28)
the summer water temperature (aesthetic objective less than 15C).
Physical – chemical (Figures 29 and 30)
the summer water temperature (aesthetic objective less than 15C) and Aluminum(aesthetic
objective less than 0.1 mg/L).
Trihalomethane’s in Distribution (Figures 31 and 32)
The Duteau Creek distribution (Upland) has been monitored for Trihalomethane’s (THM's) since
1997. With the completion of the DCWTP there was anticipation that the removal of Total and
Dissolved Organic Carbon, reduction in color and chlorine demand, that the THM's would be
greatly reduced.
GVW is working towards meeting the Interim Maximum Acceptable Concentration (IMAC) for Total
THM's of 100 ug/L or 0.100 mg/L, which is expressed as a running annual average based on
quarterly sampling. The samples should be representative of exposure; protocols should therefore,
specify inclusions of samples from extremities of the distribution. (Guidelines for Canadian Drinking
Water Quality, Health Canada.)
The Total THM’s are monitored quarterly at 4 monitoring sites located at:
1)
first customer (DCWTP);
2)
mid system (Swan Lake Pump Station – summer); and
3)
two sites with long retention or at extremities (Palfrey and BX Park).
Each site is averaged over the four sampling dates to achieve a system IMAC for the year.
46
Duteau Distribution TTHM's 1997 - 2012
ug/L
250
CDWG IMAC
200
150
100
50
0
1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
Year
1997
1998
1999
2000
2001
2002
2003
2004
ug/L
97
105
124
129
105
126
139
179
Year
2005
2006
2007
2008
2009
2010
2011
2012
ug/L
177
188
183
217
203
201
108
139
Figure 31: Duteau Distribution Trihalomethane’s
The Kalamalka Lake distribution has been monitored for THM’s since 2003. This water system has
very little to no measurable color and the Total Organic Carbon is low at most times of the year.
The Kalamalka Lake distribution has many pressure zones and a grid system with flow to and from
reservoirs.
The Total THM’s for this system are monitored at:
1)
First Customer (Kal View Meter Station);
2)
Short Contact on east side of system at 1802 Pottery Road;
3)
Mid system (Allenby Pump Station); and
4)
Long contact (Kokanee Pump Station).
47
Kalamalka Distribution TTHM's 2003-2012
ug/L
120
100
80
60
40
20
0
2003
2004
2005
2006
2007
2008
2009
2010
2011
Year
2003
2004
2005
2006
ug/L
40
53
46
41
Year
2008
2009
2010
ug/L
43
41
45
2011
49
2007
45
2012
2012
51
Figure 32: Kalamalka Distribution Trihalomethane’s
Distribution Bacteria Statistics (Figures 33 and 34)
GVW provides a Water Quality Monitoring Plan annually to Interior Health. The Frequency of
Monitoring Samples for Prescribed Water Supply Systems in outlined in Schedule B of the Drinking
Water Protection Regulations of BC. In 2012, GVW met the requirements for a population served
5,000 to 90,000 with at least 1 bacteria sample per 1,000 populations per month. GVW serves a
population of approx. 52,000 customers with a required minimum 52 bacterial samples per month.
(This does not include the Delcliffe and Outback Small Water Systems.)
In total, there were 1,643 bacterial samples taken in the GVW distribution system – 731 were sent
to an accredited lab and 912 were completed in the GVW water lab (Figure 20). The samples are
tested for Total Coliform and E.coli bacteria.
48
Figure 33: Greater Vernon Water Distribution Bacterial sample statistics 2004-2012
In Schedule A of the Drinking Water Protection Regulations of BC, the regulation for Water Quality
Standards for Potable Water it is stated:
1)
No detectable Escherichia coli (E.coli) per 100 ml.
In 2012, there was no detectable E.coli in the GVW distribution system. GVW met this
regulation.
2)
At least 90% of samples have no detectable Total Coliform bacteria per 100 ml.
In 2012, 99.5% of samples in the GVW distribution system had no detectable total Coliform
per 100 ml. (Figure 21).
3)
No sample has more than 10 Total Coliform per 100 ml.
In 2012, there were three (3) samples that had more than 10 Total Coliform:
a. One (1) at the Anderson Way Sample Station had one sample with > 10 Total Coliform
but when re-sampled had no Total Coliform on August 21, 2012; and
b. Two (2) at the Kidston Elementary monitoring site on October 16 and October 24, 2012
at a sink tap within the school. Staff inspected the site for possible cross connection
issues and the school maintenance inspected the plumbing. Major flushing occurred in
the distribution and within the school. The long term solution was establishing a sample
station outside the school at the property service.
49
Figure 34: Greater Vernon Water Distribution Bacterial % with no detectable Total Coliform 2004-2012
The distribution trending in the Kalamalka water distribution system and the Duteau Creek water
system has changed over the years. Prior to the 2008, most of the bacterial samples that had Total
Coliform counts or the presence of Total Coliform was from the Duteau Creek System. This shifted
in 2010 when the majority of positive samples were appearing in the Kalamalka Lake system. The
start up of the Duteau Creek Water Treatment Plant plus re-chlorination stations has kept the
Duteau water system in good standing. The Kalamalka Lake system improved in 2012 due to the
increased annual flushing program which started in the fall of 2011 and continues.
50

Greater Vernon Water 2012 Annual Report

Transcription

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For Immediate Release: March 23, 2011