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Corporation of the Town of Perth
Drinking Water System
2017 Summary Report
Table of Contents Overview ........................................................................................................................ 4
SECTION 1 – FAILURE TO MEET REQUIREMENTS ................................................... 6
1.1 Adverse Water Quality Incident reports (Drinking Water System) ...................... 6
1.2 Ministry Orders ................................................................................................... 7
1.2.1. Drinking Water System .......................................................................... 7
1.2.2. Water Treatment Subsystem ................................................................. 7
1.2.3. Water Distribution Subsystem ................................................................ 7
1.3 Additional Known Failures to Meet Requirements .............................................. 7
1.3.1. Drinking Water System .......................................................................... 7
1.3.2. Water Treatment Subsystem ................................................................. 7
1.3.3 Water Distribution Subsystem ................................................................ 8
1.4 Additional concerns regarding meeting requirements ......................................... 8
1.4.1. Drinking Water System .......................................................................... 8
1.4.2. Water Treatment Subsystem ................................................................. 8
1.4.3. Water Distribution Subsystem ................................................................ 9
SECTION 2 – SUMMARY OF PLANT FLOWS ............................................................ 10
2.1 Raw Water (Source water) ............................................................................... 10
2.1.2 Maximum Raw Water Flow: ................................................................. 11
2.2 Service Water (Treated Discharged Water) ...................................................... 11
2.2.1 Average Daily Service Water Flow: ...................................................... 12
2.2.3 Service Water Discharge: .................................................................... 12
2.3 Plant process water .......................................................................................... 12
2.3.1 Backwash water to Waste: ................................................................... 13
SECTION 3 – SUMMARY OF DRINKING WATER SYSTEM ABILITIES .................... 14
3.1. Water Treatment Ability .................................................................................... 14
3.1.1. Disinfection ability ................................................................................ 14
3.1.2. Chlorine Dioxide use ............................................................................ 14
3.1.3. pH adjustment (use of lime) ................................................................. 15
3.1.4. Coagulation abilities ............................................................................. 15
3.1.5. Pumping capacity ................................................................................. 15
3.1.6. Computer System ................................................................................ 16
3.2. Water Taking Ability .......................................................................................... 16
3.3. Water Storage Ability ........................................................................................ 17
3.4. Water Treatment and Distribution Personnel .................................................... 17
Table 1 – Summary of Flows January 1, 2017 to December 31, 2017 ...................... 19
Table 2 – Historical Average Daily Service Water Flow (m3) ..................................... 20
Table 3 - 2017 Raw Water Taking Perth Water Treatment Plant ............................... 21
Perth Water Treatment Plant Summary Report 2017 Page 4
2017 Summary Report
Overview
A Summary Report, as per Ontario Regulation 170/03, Schedule 22 must be prepared for each drinking water system in the province of Ontario. The report must be provided no later than March 31 to members of Municipal Council.
The DWS Summary report will cover a period for the preceding calendar year, January 01 to December 31, 2017. The completion and presentation of this report will also fulfill the requirement for a compliance report to be produced in accordance applicable regulations.
Section 1 contains,
any failures during the reporting periods to achieve the requirements of the Safe Drinking Water Act, associated drinking water regulations and guidelines, any approvals, any operating licences or permits, or any orders applicable to the Perth DWS system;
duration of the failure, and measures taken to correct the failure;
any priority concerns that might lead to failures to meet the operating requirements.
Section 2 contains, summary of quantities and flow rates of water taken from the Tay River, in addition to
water production and process wastewater generation.
Section 3 contains, an overview summary of the DWS water treatment abilities
summary of the DWS water taking ability, DWS water storage ability,
summary of DWS operating personnel Supplemental Perth DWS information sources would include, but not limited to,
The Town of Perth Water Treatment Plant year end documentation, The Town of Perth Water Distribution year end documentation, The Town of Perth DWS Annual Report.
Supplemental government legislation sources would include, but limited to,
Safe Drinking Water Act, 2002 Ontario Regulation 170/03, Drinking Water Systems Ontario Regulation 169/03, Ontario Drinking Water Quality Standards Ontario Regulation 128/04, Certification of Drinking Water System Operators and Water
Quality Analysts It is noted to ensure currency, up to date documents can be reviewed at http://www.e-laws.gov.on.ca.
Supplemental government support documentation is available at the Ministry of the Environment and Climate Change’s Drinking Water Ontario website, https://www.ontario.ca/page/drinking-water.
Perth Water Treatment Plant Summary Report 2017 Page 5
DWS Information
Drinking-Water System Number 220001272
Drinking-Water System Name: Perth Drinking Water System
Drinking-Water System Owner: Perth, The Corporation of the Town of
Period being reported: Jan 01, 2017 to Dec 31, 2017
Latest MOECC Inspection Dec 14 and 15, 2017
Previous MOECC Inspection Dec 14 and 22, 2016
Drinking-Water System Category: Large Municipal Residential System (LMRS)
Drinking Water System Facilities Class III Water Treatment Subsystem,
Class I Water Distribution Subsystem
Municipal Drinking Water Licence (MDWL) 160-101
Licence Issue Date August 04, 2016
Licence Revision Date (most recent) August 17, 2017
Licence Expiry Date August 03, 2021
Drinking Water Works Permit 160-201
DWWP Issue Date August 04, 2016
Permits to Take Water 7770-A8HKRH
PTTW Issue Date March 29, 2016
Water Taking Location Tay River
Financial Plan Number (under O. Reg. 453/07) 160-301
Accredited Operating Authority The Corporation of the Town of Perth
Operating Authority No. 160-OA1
Operational Plan No. 160-401
Perth Water Treatment Plant Summary Report 2017 Page 6
SECTION 1 – FAILURE TO MEET REQUIREMENTS
1.1 Adverse Water Quality Incident reports (Drinking Water System)
During the reporting period, there were no Adverse Water Quality Incident (AWQI)
reports filed with the MOECC Spills Action Center (SAC).
1.1.2. Environment and Climate Change Canada (ECCC), Fisheries Act
On April 06, 2017, a Water Treatment Plant site visit occurred from two (2) federal
ECCC enforcement officers who were investigating current process wastewater
discharges to the environment from water treatment facilities in the area. A
concern was raised regarding the levels of chlorine residual being discharged
during filter backwashing.
Filter backwashing uses disinfected water from the reservoir and has done so since
the facility’s inception in 1964. Filter backwash water de-chlorination is included in
Phase II of the Process Wastewater Management Plan, however that project
construction is still on-going. WTP staff immediately implemented other short-term
de-chlorination measures and will continue to use until Phase II systems are in
place. The corrective measures taken met the Environment Canada report
recommendations and action items to be followed.
Ontario MOECC officials were made aware of the site visit and resulting course of
events.
1.1.3. MOECC (SAC # 7050-ASPQX2), MDWL 160-101
On November 02, 2017, MOECC officials were contacted regarding a high Total
Suspended Solids (TSS) Phase I process wastewater discharge into the
environment.
The high TSS was a result of a failed geo-bag membrane while being pressurized
under normal operations. After investigation, it was discovered the failed area of
the membrane had been weakened earlier, and witnesses to the event described it
as being a small pin stream that quickly morphed to a 6” bag tear. Most of the
treated sludge was contained in the bag de-watering catchment area, however
water discharging was also occurring at the time. Before operators could contain
the water and sludge flow, some direct discharging of high suspended solids was
suspected to have occurred. The site was cleaned up, any collected sludge
disposed of in the proper manner, and normal operations resumed using a standby
geo-bag.
Perth Water Treatment Plant Summary Report 2017 Page 7
1.2 Ministry Orders
1.2.1. Drinking Water System No MOE orders issued.
1.2.2. Water Treatment Subsystem No MOE orders issued.
1.2.3. Water Distribution Subsystem No MOE orders issued.
1.3 Additional Known Failures to Meet Requirements
An MOECC DWS inspection was conducted Dec14 and 21, 2016, with the
Inspector’s report released March 29, 2017. Required action items are listed below
in sections 1.3.1 to 1.3.3.
1.3.1. Drinking Water System
Requirement failure
Requirement location
Duration of failure Any corrective action taken
Notification of DWS information to system owner
Better assurance that proper information is presented to Council
Identified by MOECC as a required action
Copies of the MWDL and MWWP for forwarded to Council members
Reminder on file to ensure notifications are made with MDWL and MWWP renewals or changes
1.3.2. Water Treatment Subsystem
Requirement failure
Requirement location
Duration of failure Any corrective action taken
Operations and Maintenance Manual (requirements of the DWWP and MDWL not being met)
Need of update to reflect operational changes
Identified by MOECC as a required action
complete OM manual document recreation, also in electronic form.
sign off sheet in place to ensure annual OM review
2018 start of a new preventative maintenance program.
Perth Water Treatment Plant Summary Report 2017 Page 8
1.3.3 Water Distribution Subsystem
Requirement failure
Requirement location
Duration of failure Any corrective action taken
A water tower overflow incident not recognized as a reportable spill
On Nov 17, 2016 a brief overflow of water after water level maintenance work.
Identified by MOECC as a required action
MDWL requirements reviewed, procedure to call Spills Action Center if any doubt
Provide proper operations tests on satellite DWS systems served by the Town.
Drinking water being supplied to Tay Valley Township users
Identified by MOECC as a required action
Tay Valley servicing agreement to be changed to reflect identified inspection report items.
1.4 Additional concerns regarding meeting requirements
1.4.1. Drinking Water System
Issue Any corrective action taken
none
1.4.2. Water Treatment Subsystem
Issue Concern Corrective action taken or proposed
Reservoir isolation valves
Equipment is aged and unreliable
Reservoir valve replacement program initiated in 2017, with need to continue with priority valves until completed.
Process Wastewater Residue Management
TSS reduction and de-chlorination of process residue wastewater
Phase 2 development is continuing and includes treatment of all other process wastewater sources.
Bulk chemical storage
Proximity of the bulk chemical storage tanks
Preliminary investigation into options to be initiated in 2018.
Dry Chemical volumetric feeders
Equipment is becoming aged and of concern
With increased unmanned facility operations, concern is heighted. Staff have implemented some remedial actions; however, equipment style is now outdated, and liquid chemical options need to be considered.
Perth Water Treatment Plant Summary Report 2017 Page 9
Operational electrical demand
Electrical needs for upgrading or unit replacement
electrical transformers and panels,
electrical water pump use,
heating units.
Program initiated to start replacing aged panels and transformers throughout facility. A new main power MCC installation in 2018 should create more efficient water pump operations opportunities to be considered. Further streamlining and upgrading of equipment is required to allow for future electrical power needs.
Further automation installations and upgrading
Basic automation operational needs are in place (on/off), but more digital upgrades are required to move forward.
The focus of automation needs to start addressing more in-depth treatment process monitoring to allow SCADA to perform a more efficient operations and water quality issue alerting. While some of the outdated analog circuitry has started to be replaced with digital communication networks, a significant majority of the work still remains. Development of the Balluff network communication system will allow multiple instrumentation device to interconnect to SCADA without the reliance on multi analog wire circuitry and large panel boxes.
1.4.3. Water Distribution Subsystem
Issue Any corrective action taken or being proposed
none
Perth Water Treatment Plant Summary Report 2017 Page 10
SECTION 2 – SUMMARY OF PLANT FLOWS
2.1 Raw Water (Source water)
Table RW-3 located in the reports Appendix offers an individual daily RW flow
expressed in Liters/day (1000 L = 1 m3).
The table below (RW-1) gives the monthly average RW flow, monthly single day
max and min flows, and the monthly total RW intake flow volume. A comparison of
the single day maximum of the month to the PTTW allowable volume of 9090 m3 is
shown.
Table RW-1
2.1.1. Average Daily Raw Water Flow:
The monthly average of daily average raw water flow was 2,804.23 m³ in 2017, or approximately 30.84% of the PTTW. The daily average in 2015 was 3,214 m³, followed by 2,817 m3 in 2016. Factoring weather conditions, a continued consistent water demand over recent years can be shown.
2017 Raw Water Volumes
Average Daily Flow
(m3)
Minimum Daily Flow
(m3)
Maximum Daily Flow
(m3)
TOTAL FLOW (m3)
Daily Maximum % of PTTW Allowable
Volume
January 2536.5 2128 2896 78,633 31.9%
February 2591.0 2260 2976 72,549 32.7%
March 2619.9 2279 3001 81,218 33.0%
April 2695.2 2203 4029 80,855 44.3%
May 2584.3 2256 3157 80,113 34.7%
June 2964.2 2286 3742 88,927 41.2%
July 2898.4 2332 3423 89,851 37.7%
August 2955.1 2327 3447 91,607 37.9%
September 3060.1 2656 3665 91,803 40.3%
October 3016.2 2345 4703 93,502 51.7%
November 2812.7 2486 3159 84,380 34.8%
December 2917.2 2404 3753 90,432 41.3%
ANNUAL TOTALS 2804.23 2128 4703 1,023,870
Perth Water Treatment Plant Summary Report 2017 Page 11
2.1.2 Maximum Raw Water Flow:
The maximum raw water flow in 2017 was 4703 m³ (Oct 11), followed by a
second monthly maximum of 4029 m3 (April 25). Both these maximum
month flows are attributed to a Town hydrant flushing week occurring. This
is relevant as the PTTW maximum of 9090 m3 can be exceeded during water
distribution maintenance work times.
A more realistic daily maximum during a typical operating could easily be
estimated in the 3200 to 3400 m3 range (or approx. 37% of the PTTW).
2.2 Service Water (Treated Discharged Water)
Below are the Treated Water monthly volumes, noting the high daily flow volume in
April and October can be attributed to Hydrant Flushing week(s). Elevated treated
water flows can also be associated with watermain breaks, such as on Dec 14
(3497 m3 due to break outside WTP).
Table TW-1
2017 Treated Water Volumes Discharged to Town
Average
Daily Flow (m3)
Minimum Daily Flow
(m3)
Maximum Daily Flow
(m3)
TOTAL FLOW (m3)
January 2380.9 1978 2788 73,809
February 2454.2 2185 2720 68,718
March 2491.2 2317 2689 77,228
April 2585.7 2125 4105 77,570
May 2495.2 2066 2938 77,351
June 2835.5 2352 3440 85,066
July 2795.9 2195 3366 85,066
August 2836.8 2146 3432 87,940
September 2886.3 2255 3493 86,589
October 2830.3 2356 4813 87,738
November 2568.3 2313 2825 77,048
December 2680.5 2231 3497 83,094
ANNUAL TOTALS 2653.39 1978 4813 967,217
Perth Water Treatment Plant Summary Report 2017 Page 12
2.2.1 Average Daily Service Water Flow: The daily average service water flow was 2,653 m³ in 2017. While this may have represented a significant decrease from 2015 (3,057 m³), it was of little change from 2016 (2657 m3).
2.2.3 Service Water Discharge: In 2017 a total of 967,217 m3 was discharged to the Town. A total of 972,383 m3 was realized in 2016; 1,115,473 m³ total in 2016.
1.3 Plant process water During 2017, process residue wastewater was being treated from the two settling tanks as part of the completed Phase I portion of the system. Facility operators are becoming more familiar with the system’s operations and some polymer dosing optimization does occur. Operators are also trying to enhance the process by determining an ideal sludge density for the geo-tube to handle under automated operations. Development of automated settling tank siphon operations continue, with the Phase I now partially network linked to SCADA. During settling tank cleaning, the accumulated sludge that is not removed regularly through mechanical means (scrapers and siphons) also needs to be dealt with prior to it going septic. Currently this form of settling sludge is transported off-site for direct disposal at the lagoons. It is anticipated with Phase II development, this type sludge can also be treated on-site, possibly using dilution in the backwash wastewater equalization tanks. Backwash optimization trials were undertaken in 2017, and are currently on-going prior to Phase II implementation. The effort is to create longer filter runs, lower backwash water volumes, and a more uniform sludge density. Through upgrades to the backwash control panel instrumentation, varying backwash flows can now occur routinely to help optimize this process. Air scour is now being exclusively used to prep the filter bed before actual washing occurs. This is now being used exclusively, replacing surface wash operations that were less efficient and generated unnecessary wastewater. As operators become more familiar with this operation, further optimization can be realized. The initial Phase II completion date for Dec 31, 2016 had been extended until July 2017 to allow the municipality to upgrade the filters and associated backwashing methods. A further extension was awarded with a new
Perth Water Treatment Plant Summary Report 2017 Page 13
implementation date by July 31, 2018, in part to coincide with the facility’s main 600V MCC replacement project timeline.
2.3.1 Waste Volumes
In the 2017 calendar year, a total volume of 13,572 m3 was directed through the Phase I residue treatment system. This was up slightly from the 12,267 m3 in 2016. Many factors could have contributed to this increase, particularly the Raw Water conditions needed to be addressed during heavy rainfall and runoff times (the more solids in the source water directly equates to the amount of solids generated in the settling tank sludge). One (1) outside geo-tube bag was put back into service after overwintering on April 19, 2017. It was taken back out of service on April 24 (due to TSS counts) and allowed to start the drying process. On June 20 bag removal occurred. Approximately 9367 m3 of settling tank sludge was directed to it, with ~ 212 metric tonnes of dry sludge taken to landfill. Efforts were made during the Spring of 2017 to try and direct as much sludge to the greenhouse bag as possible. This involved feeding it on a rotating basis, allowing sludge compaction (and extra dewatering) time to occur. The greenhouse bag was taken out of service on June 02, allowed to dry, and removed on Oct 27, 2017. The greenhouse bag is smaller in size to the outside bags, due to building space restrictions. Approximately 5233 m3 of settling tank sludge was directed to it, with ~ 188 metric tonnes of dry sludge taken to landfill. The second outside bag was predominantly used during the summer and fall months. It was taken out of service Nov 02, 2017 as a result of a bag tear. At the time it had 6982 m3 of sludge directed to it. It is being allowed to dry overwinter, and in all likelihood removed in the spring. The greenhouse bag was installed and put into service on Dec 09, 2017. By year end, it had just under 1000 m3 directed to it. It needs to be noted that in 2017, approximately 9155 m3 of backwash wastewater was generated, still currently being directly discharged back to the river. While it is anticipated much of this volume can be decanted off, there still will a significant additional sludge volume directed to the geo-tubes bags with Phase II completion. Bag capacity could become an issue, specifically with the smaller greenhouse bag configuration.
Perth Water Treatment Plant Summary Report 2017 Page 14
SECTION 3 – SUMMARY OF DRINKING WATER SYSTEM ABILITIES
3.1. Water Treatment Ability The Perth water treatment plant continues to maintain a strong position in
supporting its ability to provide a reliable supply of safe, clean drinking water to its
community. Funding reserves are maintained in case of an operational emergency
or unexpected major breakdown.
3.1.1. Disinfection ability Disinfection of the drinking water is ultimately achieved through two points of
application – primary disinfection – dosed as water enters the clear well and
secondary disinfection – dosed at the treated water discharge point. Both of
these critical treatment processes have redundancy in the pumps as well as
the dosage lines.
Varying raw water conditions require operators to adjust and control
chemical dosages to meet regulations in a cost effective manner.
It should be noted that many factors contribute to the overall disinfection
process, including pre-treatment, coagulation and pH control. Of most
importance is the daily CT calculation. The CT value is the product of the
concentration of a disinfectant and the contact time with the water being
disinfected. WTP operations in 2017 well exceeded the legislated CT
operational requirements, supporting the ability to meet proper disinfection
needs.
Another critical factor for proper disinfection is turbidity. Water with high
turbidity can block the disinfection ability, and one primary reason why
disinfection occurs after filtration. The objective is to maintain filter effluent
turbidity of < 0.300 NTU for 95% of the time. The Perth WTP had only
exceeded the 0.300 target on each filter for less 30 minutes over the entire
year, with a typical daily average of 0.04 NTU being acheived.
3.1.2. Chlorine Dioxide use Chlorine dioxide continues to be generated seasonally on site and plays an
important role in achieving disinfection while mitigating the formation of
chlorine disinfection by-products such as THM’s and HAA’s (see 3.1.1
above). These disinfection by-products are suspected carcinogens and are
commonly formed when high doses of chlorine gas or sodium hypochlorite
react with raw water heavily laden with organic matter. Chlorine dioxide use
is uncommon among water treatment facilities due to chemical cost however
the advantage of a “cleaner” disinfection process with less by-product
formation is worth the extra cost during extreme seasonal water quality
Perth Water Treatment Plant Summary Report 2017 Page 15
challenges seen in Perth. As well, the renewal of the municipal Drinking
Water License saw the additional sampling requirement of Chlorates and
Chlorites added as a quarterly sampling requirement.
3.1.3. pH adjustment (use of lime) Following the coagulation and disinfection processes, where the pH of the
water is lowered through the addition of chemicals, hydrated lime needs to
be mixed in the clearwell to return the pH to a range of 7.1 to 7.3. This
range is desired in an effort to ensure the water within the distribution system
is close to neutral and thereby not aggressive in the deterioration of the
distribution network as well as homeowner plumbing and fixtures. The Town
of Perth qualified for relief from the legislated lead sampling program in 2011
as a result of few exceedances of the lead maximum allowable
concentration.
3.1.4. Coagulation abilities The water treatment plant employs a high-end coagulant called PAX XL-6 to
aid in the flocculation and sedimentation of suspended solids in water prior
to filtration. Although more expensive than conventional coagulants such as
aluminum sulphate, product usage is reduced and outperforms other less
expensive chemicals at certain critical temperature ranges. Winter months
and the associated cold water temperature and density present the most
difficult conditions for the coagulant to settle the solids. Our new licence
allows for pH enhancement (use of HCl) in situations of high pH or alkalinity
raw water conditions that make floc formation difficult.
3.1.5. Pumping capacity The existing pumping capacity meets the needs of the facility and the water
demand from the drinking water system. The HLPs adequately operate with
the SCADA to supply the Town’s distribution system and maintain sufficient
water pressures. The LLPs operate sufficiently to move enough water
through the facility to meet the demands while maintaining process design
requirements.
In the past, variable speed drives (VSD) were tried to be installed on the
HLP pump motors to allow for possible better efficiency. The existing HLP
pumps and electrical components were not well suited for this purpose, and
created operational issues. It is hoped with the new MCC installation,
another assessment of VSD might occur. At minimum, any future pump
motor replacements should be able to accept VSD operations, and the new
MCC will support this effort.
Perth Water Treatment Plant Summary Report 2017 Page 16
As mentioned, the existing LLP pumps suffice for the current needs. Should
either of the lower sized LLP be in the need of replacement, a slightly larger
capacity pump could supply a better midrange operating range. The two
existing pumps (~ 60-66 L/s) can typically require 13-16 hours of daily
operation to meet the current water demand.
3.1.6. Computer System There were numerous programming changes and upgrades to the WTP
SCADA (Supervisory Control and Data Acquisition) system, mainly attributed
to continuing facility automation efforts. The majority of the 2017 SCADA
work was directly related to basic LLP automation operations (on/off, alarm
and failsafe shutdowns). Initial start up components for a digital network
system was purchased and will be developed further in upcoming years.
Although the objective of basic unmanned facility LLP operations was
achieved in 2017, there will still need to be more instrumentation and failsafe
devices installed to be even more confident in monitoring and recognizing
potential water quality. A more focused approach to cleaning up redundant
analog signal circuitry, and upgrading to a digital network. As newer
instrumentation is being brought in, the reliance on a digitalized
communications network will become more prominent.
The existing hydro service (and electrical capability within the plant) was
reaching maximum capability, and preliminary work for a complete primary
power MCC was started in late 2017 (to be completed in early 2018). The
digital communications aspect of the new MCC will also provide future
opportunities to monitor equipment and link directly in SCADA programming,
something lacking with the existing 1964 circa unit.
3.2. Water Taking Ability The WTP is operating well within the PTTW limits. The Permit to Take Water
(#5464-6MHL84) authorizes the municipality to take water with maximum volumes
regulated for both litres/min as well as litres per day. This Permit was renewed in
the 2016 year and will expire again in 2026. Raw Water pump capacities
determine these figures (6,360 l/min (106 L/s) flow; and 9,092 m3/day).
The maximum raw water flow in 2017 was 4703 m³ (Oct 11), followed by a second
monthly maximum of 4029 m3 (April 25). Both these maximum month flows are
attributed to a Town hydrant flushing week occurring. This is relevant as the PTTW
maximum can be exceeded during water distribution maintenance work times. A
Perth Water Treatment Plant Summary Report 2017 Page 17
more realistic daily maximum during a typical operating could easily be estimated in
the 3200 to 3400 m3 range (or approx. 37% of the PTTW).
In 2017, these was no concern with insufficient water quantity amounts. The heavy
rainfall and high waters of 2017 did cause some concern regarding water quality,
however the treatment process was able to handle the situation(s) faced.
3.3. Water Storage Ability The clear well and reservoir were cleaned and inspected in 2016. Additional time
was taken to pay particular attention to the reservoir’s western wall, given this
would be adjacent to any process wastewater Phase II construction, specifically pit
blasting for the equalization tanks. Reservoir valve replacement program was
resumed in 2017, with the access port work of 2017 completed and reservoir
influent valve removed. The reservoir storage capacity appeared to be sufficient to
meet the disinfection contact time needs, as well as providing required water supply
for domestic, industrial, and fire fighting purposes.
The elevated tank had a second communications system installed, with upgraded
transmitters for more reliable signals. Regular maintenance and emergency repairs
occurred within the distribution system including mains, services and hydrants.
3.4. Water Treatment and Distribution Personnel The WTP is a Class III facility. With basic automation, 8 hour shifts can be realized,
but shifts still occur 7 days a week. Automation will start LLP operations prior to the
shift start, and continue after the shift until water supplies are topped up for
overnight. A WTP operator is on-call for immediate response to any WTP
operational alarms, either through remote site communications or an actual site visit
depending on the situation severity. Shifts and duties are rotated amongst two full
time operators and a Lead Hand, one less operator from 2016. The Lead Hand has
WT Level III certification, an operator also with a Level III certification, and the
second operator with a Level II certification.
The Distribution system is a Class 1 facility and is maintained by a Lead Hand and
four operators, who rotate through other departments within the organization. The
Lead Hand possesses a level III certification in distribution and supply. Three (3)
other operators have level II certification, with one operator as an OIT (operator in
training).
Feb 16, 2018 Dave Gibson
Perth Water Treatment Plant Summary Report 2017 Page 18
Lead Hand – WT and WWT
Perth Water Treatment Plant Summary Report 2017 Page 19
Table 1 – Summary of Flows January 1, 2017 to December 31, 2017 Perth Water Treatment Plant
PTTW maximum allowable flow rate: 9,090 m3/ day
Raw water (m3)
Discharge (Service)
Water (m3)
Month Monthly Daily
Average Flow
Monthly
Total
Flow
Monthly
Daily
Average
Flow
Monthly
Total
Flow
January 2536.5 78,633 2380.9 73,809
February 2591.0 72,549 2454.2 68,718
March 2619.9 81,218 2491.2 77,228
April 2695.2 80,855 2585.7 77,570
May 2584.3 80,113 2495.2 77,351
June 2964.2 88,927 2835.5 85,066
July 2898.4 89,851 2795.9 85,066
August 2955.1 91,607 2836.8 87,940
September 3060.1 91,803 2886.3 86,589
October 3016.2 93,502 2830.3 87,738
November 2812.7 84,380 2568.3 77,048
December 2917.2 90,432 2680.5 83,094
Year Average 2804.23 85,322.5 2653.39 80,601.4
Year Total 1,023,870 967,217
Perth Water Treatment Plant Summary Report 2017 Page 20
Table 2 – Historical Average Daily Service Water Flow (m³)
Perth Water Treatment Plant
2017 2016 2015 2014 2013 2012
JAN. 2,381 2,502 2,872 3,211 2,795 2,521,
FEB. 2,454 2,571 3,290 2,980 3,504 2,708
MARCH 2,491 2,455 3,298 3,053 3,664 2,741
APRIL 2,586 2,471 3,157 3,247 3,565 2,698
MAY 2,495 2,931 3,392 3,003 3,187 3,098
JUNE 2,836 2,996 3,002 3,285 2,845 3,109
JULY 2,796 2,954 3,048 3,292 3,034 3,441
AUG. 2,837 3,024 3,015 3,099 3,076 3,137
SEPT. 2,886 2,694 2,979 2,992 2,839 2,962
OCT. 2,830 2,603 2,998 2,901 2,894 2,839
NOV. 2,568 2,372 2,852 2,693 2,916 2,658
DEC. 2,681 2,300 2,784 2,642 3,134 2,578
MAXIMUM 2,886 3,024 3,392 3,292 3,644 2,917
MINIMUM 2,381 2,300 2,784 2,642 2,795 2,155
AVERAGE 2,654 2,656 3,057 3,033 3,119 2,892
Perth Water Treatment Plant Summary Report 2017 Page 21
Table 3 - 2016 Raw Water Taking Perth Water Treatment Plant - Appendix 1
Day January February March April May June July August September October November December
1 2,128,000 2,633,000 2,518,000 2,311,000 2,562,000 3,026,000 2,398,000 2,901,000 3,123,000 2,484,000 2,773,000 2,922,000
2 2,446,000 2,540,000 2,522,000 2,474,000 2,422,000 2,417,000 2,332,000 2,846,000 3,013,000 2,897,000 2,721,000 2,854,000
3 2,639,000 2,976,000 2,383,000 2,566,000 2,695,000 2,286,000 2,761,000 2,672,000 2,656,000 2,998,000 3,085,000 2,828,000
4 2,700,000 2,325,000 2,645,000 2,506,000 2,548,000 2,358,000 2,839,000 2,756,000 2,735,000 2,906,000 2,735,000 2,804,000
5 2,425,000 2,528,000 2,457,000 2,744,000 2,256,000 2,602,000 3,018,000 2,563,000 2,860,000 3,078,000 2,723,000 2,782,000
6 2,748,000 2,674,000 2,546,000 2,562,000 2,305,000 2,815,000 3,423,000 2,327,000 3,158,000 2,776,000 2,689,000 3,025,000
7 2,393,000 2,425,000 2,974,000 2,575,000 2,289,000 2,766,000 3,221,000 2,459,000 3,152,000 2,538,000 2,695,000 2,846,000
8 2,329,000 2,475,000 2,652,000 2,203,000 2,768,000 3,731,000 2,789,000 2,833,000 2,801,000 2,703,000 2,810,000 2,855,000
9 2,716,000 2,633,000 2,279,000 2,450,000 2,392,000 3,244,000 2,532,000 2,955,000 2,923,000 2,697,000 2,771,000 2,796,000
10 2,437,000 2,896,000 2,750,000 2,513,000 2,403,000 3,152,000 2,836,000 3,184,000 2,836,000 4,477,000 2,736,000 2,669,000
11 2,657,000 2,453,000 2,547,000 2,460,000 2,595,000 2,919,000 2,971,000 2,956,000 3,346,000 4,703,000 2,704,000 3,107,000
12 2,828,000 2,418,000 2,460,000 2,674,000 2,370,000 3,249,000 3,167,000 2,632,000 3,114,000 4,642,000 2,932,000 3,149,000
13 2,688,000 2,613,000 2,375,000 2,413,000 2,438,000 3,742,000 2,677,000 2,777,000 3,226,000 3,998,000 2,837,000 2,948,000
14 2,195,000 2,561,000 2,740,000 2,563,000 2,302,000 3,341,000 3,239,000 3,195,000 3,016,000 2,345,000 2,552,000 3,753,000
15 2,252,000 2,708,000 2,433,000 2,456,000 2,581,000 3,424,000 2,604,000 2,861,000 3,218,000 2,698,000 3,039,000 3,241,000
16 2,820,000 2,742,000 2,910,000 2,287,000 2,504,000 3,111,000 2,607,000 2,789,000 3,069,000 2,941,000 2,795,000 3,368,000
17 2,492,000 2,882,000 2,596,000 2,478,000 3,132,000 2,461,000 3,185,000 2,843,000 3,037,000 3,279,000 2,829,000 3,000,000
18 2,402,000 2,611,000 2,721,000 2,642,000 3,157,000 2,687,000 3,346,000 3,114,000 2,933,000 3,103,000 2,756,000 2,773,000
19 2,733,000 2,260,000 2,667,000 2,661,000 2,651,000 3,342,000 3,292,000 2,937,000 3,364,000 2,967,000 2,609,000 2,931,000
20 2,555,000 2,593,000 2,652,000 2,747,000 2,819,000 3,111,000 3,316,000 2,775,000 3,299,000 2,827,000 3,020,000 3,385,000
21 2,512,000 2,617,000 2,594,000 2,428,000 2,453,000 3,147,000 3,400,000 3,322,000 3,665,000 2,453,000 2,885,000 2,945,000
22 2,272,000 2,420,000 2,638,000 2,352,000 2,310,000 3,035,000 3,050,000 3,447,000 3,207,000 2,969,000 2,804,000 2,999,000
23 2,657,000 2,640,000 2,668,000 2,628,000 2,968,000 2,986,000 2,635,000 3,373,000 3,056,000 2,879,000 2,930,000 2,787,000
24 2,442,000 2,606,000 3,001,000 3,988,000 2,772,000 2,803,000 2,513,000 3,152,000 3,025,000 2,914,000 2,848,000 2,810,000
25 2,601,000 2,426,000 2,533,000 4,029,000 2,735,000 2,551,000 2,769,000 3,280,000 3,238,000 3,005,000 2,486,000 2,404,000
26 2,896,000 2,496,000 2,550,000 3,845,000 2,600,000 2,962,000 2,896,000 2,942,000 3,025,000 2,885,000 3,159,000 2,688,000
27 2,782,000 2,800,000 2,441,000 3,586,000 2,701,000 2,691,000 2,677,000 2,756,000 3,335,000 2,715,000 2,747,000 2,668,000
28 2,406,000 2,598,000 2,887,000 2,624,000 2,767,000 3,352,000 3,119,000 3,411,000 2,876,000 2,575,000 2,821,000 3,133,000
29 2,278,000 2,531,000 2,628,000 2,512,000 2,852,000 2,721,000 3,104,000 2,787,000 2,587,000 2,914,000 2,438,000
30 2,557,000 2,713,000 2,462,000 2,499,000 2,764,000 2,740,000 3,305,000 2,710,000 2,841,000 2,975,000 2,816,000
31 2,647,000 2,835,000 2,607,000 2,778,000 3,140,000 2,622,000 2,708,000
Minimum 2,128,000 2,260,000 2,279,000 2,203,000 2,256,000 2,286,000 2,332,000 2,327,000 2,656,000 2,345,000 2,486,000 2,404,000
Maximum 2,896,000 2,976,000 3,001,000 4,029,000 3,157,000 3,742,000 3,423,000 3,447,000 3,665,000 4,703,000 3,159,000 3,753,000
Average 2,536,548 2,591,036 2,619,935 2,695,167 2,584,290 2,964,233 2,898,419 2,955,065 3,060,100 3,016,194 2,812,667 2,917,161
Monthly
total 78,633,000 72,549,000 81,218,000 80,855,000 80,113,000 88,927,000 89,851,000 91,607,000 91,803,000 93,502,000 84,380,000 90,432,000
Running
Year total 78,633,000 151,182,000 232,400,000 313,255,000 393,368,000 482,295,000 572,146,000 663,753,000 755,556,000 849,058,000 933,438,000 1,023,870,000
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