grindrod water utility 2017 annual report · the grw water system draws water from the shuswap...

Grindrod Water Utility 2017 Annual Report

Regional District of North Okanagan Prepared for: Interior Health & RDNO 9848 Aberdeen Road Prepared by: Connie Hewitt, Water Quality Technologist Coldstream, BC Contributor: James de Pfyffer, Small Utilities Manager V1B 2K9 December 2018



TABLE OF CONTENTS INTRODUCTION .......................................................................................................................... 2

BACKGROUND ............................................................................................................................ 2

GRW WATER SYSTEM OVERVIEW ........................................................................................... 2

System Overview ...................................................................................................................... 2

Treatment Requirements .......................................................................................................... 3

SYSTEM CLASSIFICATION / OPERATOR CERTIFICATION ..................................................... 4

SOURCE ASSESSMENTS AND SOURCE RESPONSE PLANS ................................................ 5

WATER QUALITY MONITORING ................................................................................................ 5

Source Water ............................................................................................................................ 6

Turbidity ................................................................................................................................ 6

Bacteriological Summary ...................................................................................................... 6

Chemical Summary ............................................................................................................... 6

Treatment .................................................................................................................................. 9

Distribution .............................................................................................................................. 11

Water Treatment Effluent ........................................................................................................ 12

EMERGENCY RESPONSE / NOTIFICATION ........................................................................... 12

CUSTOMER CALLS AND RESPONSE ..................................................................................... 15

CAPITAL AND IMPROVEMENT PROJECTS ............................................................................ 15

LONG TERM IMPROVEMENTS ................................................................................................ 15

CLOSING .................................................................................................................................... 16

APPENDIX A – WATER QUALITY SAMPLING SCHEDULE ..................................................... 17

APPENDIX B – DISTRIBUTION SYSTEM MAP ........................................................................ 18

APPENDIX C - CONTACT TIME ................................................................................................ 19

APPENDIX D - POLICY STATEMENT ON PRE-ENGINEERED WATER TREATMENT PLANTS ...................................................................................................................................... 20

APPENDIX E - OBSERVATIONS AND RECOMMENDATIONS OF THE IHA ROUTINE INSPECTION WATER SUPPLY SYSTEM REPORT ................................................................. 21


TABLE OF TABLES Table 1 Water Quality Monitoring Schedule ................................................................................. 5 Table 2: Parameters and Frequency Sampled ............................................................................. 6 Table 3: Source Water Turbidity Results ...................................................................................... 6 Table 4: Source Water Bacterial Results Summary ...................................................................... 6 Table 5: Source Water Field Data Including Stats ........................................................................ 7 Table 6: Raw Water (untreated) Comprehensive Annual Analysis ............................................... 8 Table 7: Treated Water ................................................................................................................. 9 Table 8: Treated Water Comprehensive Annual Analysis .......................................................... 10 Table 9: Distribution Bacteriological Sample Site Results .......................................................... 11 Table 10: Distribution Bacteriological Summary for the Three Distribution Sites ........................ 11 Table 11: THM Results for 2017 ................................................................................................. 12 Table 12: Grindrod Incident Report ............................................................................................. 14 TABLE OF FIGURES Figure 1: RDNO Notification to Subscribe for Announcements .................................................. 13 Figure 2: RDNO Notification to Subscribe for Grindrod Water Announcements ......................... 13 ACRONYMS CDWQ Canadian Drinking Water Quality DWPR Drinking Water Protection Regulation ERP Emergency Response Plan EOCP Environmental Operator Classification Program GRW Grindrod Water Utility IH Interior Health mg/L Milligrams per liter PAC Poly Aluminum Chloride PLC Programmable Logic Controller RDNO Regional District of North Okanagan SCADA Supervisory Control and Data Acquisition SRWSP Shuswap River Water Sustainability Plan SDWQG British Columbia Source Drinking Water Quality Guidelines THMs Trihalomethane’s TTHMs Total Trihalomethane’s UV Ultraviolet WTP Water Treatment Plant

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INTRODUCTION As required by the British Columbia Drinking Water Protection Act, the Regional District of North Okanagan (RDNO) provides the following annual report in accordance with our conditions on permit for the Grindrod Water Utility (GRW). This report provides an overview of the following:

• a description of the water source and how it is treated, • the water system and distribution to the customers of GRW, • the system and operators Environmental Operator Certification Program (EOCP)

classification, • the annual water monitoring program, • how the water system is monitored, • a summary of the 2017 water quality analysis, and • how the system is managed to achieve the safest and highest quality water possible.

The annual reports are available to the public through the RDNO website. BACKGROUND Construction of the GRW system was complete in 1997 at which time it became a function of the RDNO. The RDNO Manager, Small Utilities is responsible for the operation and management of this system with oversight provided by the General Manager, Utilities and the RDNO Board of Directors. RDNO employs a water system operator by contract to complete day-to-day operations and maintenance tasks. The contract includes a requirement for the operator to be available 24 hours a day, 7 days a week to respond to emergencies, and have a backup operator available to respond as necessary. GRW WATER SYSTEM OVERVIEW System Overview The GRW water system draws water from the Shuswap River through a screened intake line to a wet well. The raw water is pumped from the wet well through a packaged Water Treatment Plant (WTP) into a below ground treated water storage reservoir. As there is no elevated storage, the distribution pumps run continuously to maintain pressure in the distribution system. The Grindrod packaged WTP is designed for a filter flow rate of 66 U.S. gpm (4.2 litres per second), but is operated at about 53 U.S. gpm (3.3 Lps) which is the maximum flow rate of the pump in the wet well. The wet well pump speed can be reduced manually, usually when raw water turbidity is high, to allow the plant to treat the water at a rate where it can meet turbidity guidelines. The packaged WTP consists of a hydraulic flocculation chamber, a tube settler/clarifier, and a mixed media filter. The plant discharge turbidity is typically below 0.2 NTU. An overview of the GRW water system is as follows:

• A water intake in the Shuswap River next to and downstream of the Highway 97A bridge.

• Water is directed by gravity from the intake screen to a wet well from where the water is pumped to the packaged WTP in the pump house.

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• Before the water enters the WTP, it passes through one of two centrifuges. These remove most of the heavier sediments such as sand that has been drawn into the pipe.

• The water is dosed with chlorine before it enters the packaged WTP. This causes manganese to drop out of solution, allowing the WTP to remove it.

• The packaged WTP provides conventional filtration, including the addition of a Poly Aluminum Chloride (PAC) coagulant, mixing, settling, filtration, and chlorine disinfection. The WTP was not designed, constructed and approved under the Interior Health (IH) “Policy Statement on Pre-Engineered Water Treatment Plants”, so IH has specified they will rate it as a direct filtration plant.

• After the water is processed in the WTP, it is disinfected with sodium hypochlorite at a dosage rate of approximately 2 milligrams per liter (mg/L) before it flows by gravity to a 240 m3 concrete reservoir located partially beneath the pump house.

• The treated water is pumped into the distribution system from the reservoir by two 7.5 HP distribution pumps. One pump is a constant feed pump while the other is a variable speed pump that fluctuates flow as demands are required to maintain a distribution pressure of about 55 psi (380 kPa).

• The distribution system consists of a 150mm pipe through the village with 100mm diameter pipe installed on branch lines to side roads (see Figure 1). All pipe is Class C-900 PVC.

• The distribution system has 15 standpipes, 50mm diameter, for flushing and fire protection, however the system does not provide fire protection that meets the Fire Underwriters Survey as there is no backup power, no fire pump, no full size fire hydrants, and there is insufficient reservoir storage.

• Because there is no backup power at the pump house, a power outage will cause interruption to water service.

The GRW system serves a total of 57 connections made up of 47 residential, 9 commercial/institutional and 1 industrial user. The population served is approximately one hundred forty (140). In 2017, there was a total volume of 9,254 cubic meters drawn from the Shuswap River for the purpose of water works. The plant is authorized to discharge filter backwash effluent to the Shuswap River under the provisions of the Waste Management Act, Permit 15263. The filter backwash is released to a settling pond (wetland) that discharges to a ditch via an outlet chamber. The effluent monitoring and reporting requirements are provided to the Ministry of Environment annually. Treatment Requirements The treated water quality objectives for all BC water systems are to meet the Provincial surface water standards for the following:

• 4 log removal or inactivation for viruses, • 3 log removal or inactivation for protozoa (Cryptosporidium and Giardia), • 2 treatment barriers, • 1 NTU maximum turbidity, and • 0 E.coli.

We note however for GRW that IH requires elevated treatment objectives due to high agricultural activity along the banks of the river upstream of Enderby/Grindrod, as noted in Observations and

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Recommendations of the IH routine inspection water supply system report, dated January 20, 2014. The elevated treatment objectives are as follows:

• 5 log removal or inactivation for viruses, • 4 log removal or inactivation for protozoa (Cryptosporidium and Giardia), • 2 treatment barriers, • 1 NTU maximum turbidity, and • 0 E.coli.

RDNO disputes the elevated treatment objectives because other communities in the area drawing water from the Shuswap River are not required to meet these criteria. The treatment levels at GRW are not compliant with these elevated standards. The treatment process of flocculation/clarification/filtration employed at the GRW packaged WTP provides “conventional treatment”, which would normally provide a 2 log credit for viruses and a 3 log credit for protozoa. However, the WTP was not designed constructed and approved under the IH “Policy Statement on Pre-Engineered Water Treatment Plants” adopted April 1997, so IH has specified that the packaged WTP provides “direct filtration”, which qualifies for a 1 log removal credit for viruses and a 2 log removal credit for giardia and cryptosporidium. Chlorination of the treated water provides sufficient Chlorine Contact Time to provide a 4 log inactivation of viruses, which when added to the 1 log credit for direct filtration, provides the required 5 log removal or inactivation of viruses. Chlorination provides a 1 log removal credit for giardia, but does not affect cryptosporidium, so only the 2 log removal credit for direct filtration applies for protozoa (Appendix B). Filtration and chlorination provide 2 treatment barriers, and filtration reduces the turbidity to well below 1 NTU, with no occurrences of E.coli in the treated water. In order to meet the requirements of the IH Policy Statement on Pre-Engineered Water Treatment Plants the packaged WTP may require construction of double walls between treatment basins to introduce air gap separations. This work would have to be completed with approvals from IH. Alternatively, IH could consider introducing a testing protocol for the WTP, similar to the requirements for backflow prevention devices, to ensure that untreated water does not bypass a step in the treatment process. If the elevated water quality objectives cannot be reduced, and the WTP cannot be upgraded to provide conventional filtration meeting IH approval, the Utility may have to look into installing Ultraviolet (UV) treatment after the WTP, or another treatment enhancement. SYSTEM CLASSIFICATION / OPERATOR CERTIFICATION GRW is owned and operated by the RDNO and is certified by the EOCP as a Small Water System (Facility No. 483). The chief or lead operator, Warren McKim (EOCP Certification # 1336), is currently certified for Chlorine Handling (CH), Water Distribution II (WD-II), Water Treatment I (WT-I), Waste Water Collection I (WWC-I), and Municipal Wastewater Treatment II (MWWT-II). The backup operator, Nicholas McKim (EOCP Certificate # 9341), is currently certified for Water Distribution I (WD-I). The overall water system operations, maintenance and infrastructure improvements are managed by James de Pfyffer, Manager, Small Utilities, and Zee Marcolin, General Manager, Utilities. The water quality monitoring program is the responsibility of Renee Clark, Manager, Water Quality.

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SOURCE ASSESSMENTS AND SOURCE RESPONSE PLANS The source of water for GRW is the Shuswap River. Due to the large contribution size of the watershed upstream of the community of Grindrod and the small size of the water utility, aspects of source protection for this utility have been incorporated into the Shuswap River Water Sustainability Plan (SRWSP). The SRWSP, developed by the RDNO Planning department, has been following a three phase process, and is currently in Phase III, Implementation and Monitoring, which will be undertaken over a number of years. The SRWSP can be found on the RDNO website at the following location: www.rdno.ca/index.php/services/planning-building/planning-projects/shuswap-river-watershed-sustainability-plan/. To further understand the source water for the GRW the Shuswap Watershed Council has released a summary report covering results of recent water quality monitoring in the Shuswap watershed. The 2017 report can be found at: www.fraserbasin.bc.ca/_Library/TR_SWC/SWC_water_quality_report_2017_web.pdf. WATER QUALITY MONITORING The Water Quality Monitoring program for GRW is based on the requirements of the Drinking Water Protection Regulation (DWPR) Schedules A and B, the Guidelines for Canadian Drinking Water Quality (CDWQ), and the British Columbia Source Drinking Water Quality Guidelines (SDWQG). The Water Quality Monitoring program has been in effect since the commissioning of this system and is reviewed periodically to ensure compliance with current standards. The program was last reviewed in December 2016 and updated accordingly. An overview of the 2017 GRW sampling program and schedule is provided in Table 1 and Table 2 with the full program details provided in Appendix A. The sampling frequency for GRW is 4 samples per month as per the requirements of Schedule B of the DWPR for water supply systems with a population of less than 5000. The parameters analyzed are as per Schedule A of the DWPR and includes bacterial (Total coliform and E.coli) plus the field parameters of chlorine residual and turbidity. Sampling is performed bi-weekly within the distribution system (treated) and monthly for the source water (raw). Chlorine residual levels (free and total) are taken to assist in managing the disinfection levels throughout the water system. Table 1: Water Quality Monitoring Schedule

Sampling Site Name Sampling Point Type Sampling Frequency Grindrod Treatment Plant – Pre-treatment Raw Water Monthly

Grindrod Treatment Plant –Treated

First Customer – Distribution Header Monthly

James Street SS End point within the distribution Monthly

Mayberry Country Store Mid-point in Distribution System Monthly

Fourth Avenue SS End point within the distribution system Monthly

Grindrod Treatment Plant – Filter Effluent

Filter Backwash Effluent (at outlet chamber) March, July, November

http://www.rdno.ca/index.php/services/planning-building/planning-projects/shuswap-river-watershed-sustainability-plan/

http://www.rdno.ca/index.php/services/planning-building/planning-projects/shuswap-river-watershed-sustainability-plan/

http://www.fraserbasin.bc.ca/_Library/TR_SWC/SWC_water_quality_report_2017_web.pdf

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Table 2: Parameters and Frequency Sampled Parameter Frequency of Analysis Bacterial samples sent to an accredited laboratory Monthly

Turbidity NTU Three times per week Chlorine Residual mg/L Three times per week Trihalomethane’s Three times per year Full comprehensive analysis on raw and treated water Once a year

Source Water Turbidity Turbidity of the raw water ranges from 0.41 to 20.10 NTU in 2017 (Table 3). The highest turbidity event measured was 20.1 NTU on May 15, 2017 which was during spring freshet. Turbidity is removed during treatment. Table 3: Source Water Turbidity Results 2017 Grab Sample Turbidity Statistics Well #2 Minimum 0.41 Maximum 20.10 Average 5.85 # Samples Counts < 1 NTU 2 Counts > 1 NTU 13 Counts > 3.5 NTU 10 Counts > 5 NTU 7

Bacteriological Summary Table 4 shows that the Shuswap River has a constant presence of Total Coliform and E.coli with very high levels of E.coli seen during freshet. The turbidity and microbial results clearly demonstrate why a high level of treatment is required for this source. Table 4: Source Water Bacterial Results Summary Total Coliform (CFU/100mL) E.coli (CFU/100mL) Minimum 17 Minimum 1 Maximum 320 Maximum 24 Average 110 Average 10 Count 11 Count 11

Chemical Summary Table 5 summarizes the pH, temperature and conductivity water quality parameters that are taken throughout the year from the source water. Monitoring these parameters provides operations with a method to ensure the continual safety of the system and a notification system in which to respond to source water changes. There is no treatment or recourse for temperature as it is dictated by the weather. Temperature is an aesthetic parameter and does not present a health risk. However, higher temperatures can increase microbial regrowth in the distribution mains and to offset this risk RDNO has a flushing program to clean the mains and reduce the risk of regrowth occurring.

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Table 5: Source Water Field Data Including Stats Sample Date pH Temperature (oC) Conductivity (uS/cm) 1/24/2017 5.8 2/21/2017 5.4 3/22/2017 7.5 7.5 1504/20/2017 9.4 5/15/2017 10.2 5/16/2017 10.4 5/18/2017 8.4 10.6 6/13/2017 6/20/2017 15.0 7/27/2017 7.3 21.5 1508/15/2017 18.6 9/19/2017 16.2 10/17/2017 10.6 11/23/2017 7.7 9.6 23012/19/2017 5.1 Minimum 7.30 5.10 150Maximum 8.40 21.50 230Average 7.73 11.14 177Count 7.30 5.10 150

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Table 6 provides the results of the Comprehensive Sampling completed annually. All physical and chemical parameters were well within the CDWQ standards. Table 6: Raw Water (untreated) Comprehensive Annual Analysis

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Treatment Key plant operating information is continuously monitored with a Supervisory Control and Data Acquisition (SCADA) system which can also be accessed remotely on-line by management and operations. The SCADA system also has safe operating set points where an alarm is sent to the operator when the monitored parameters do not fall within the specified range, allowing the operator to respond immediately. On-line chlorine and turbidity analyzers monitor free chlorine and turbidity respectively from the distribution header located at the point where water leaves the treated water storage reservoir and enters the distribution. The system is alarmed so that if there is a reduction of chlorine or an increase of turbidity an alarm is sent to the operator who will respond immediately to ensure any issues with the treatment process are corrected. Table 7 summaries the monthly averages of chlorine and turbidity of the online data collected in comparison with the monthly grab samples taken. As seen in Table 7, six (6) months of SCADA data for chlorine and all the SCADA turbidity data is unavailable for 2017. This is due a power outage and the SCADA system being upgraded that occurred at the beginning of July and the failure of the turbidity analyzer in August. The power loss resulted in the loss of historic data on the site computer and in response, RDNO has implement a program where the Water Quality Technicians download this data to the RDNO computer for a monthly data backup. The turbidity analyser was sent away for repairs and was fixed and reinstalled on September, however SCADA was not reading correctly. Although the turbidity analyser is important to monitor the treatment process, it is not imperative to the safe operations of the water treatment plant. The addition of chlorine is extremely important to the safety of the water and the chlorine analyser is a critical piece of equipment as it notifies the operator if there is an issue with this process. It should be noted that although the chlorine data was lost, the chlorine was still measured and monitored at all times. Handheld chlorine and turbidity measurements are also recorded as a check for the analyzers and is a requirement of the water system operator’s regular duties, and this is completed and recorded at a minimum of three times per week. A monthly average of the turbidity and chlorine results are provided in Table 7 which indicate a residual chlorine level of between 1 mg/L to 1.6 mg/L is maintained and that the turbidity is consistently below 0.3 NTU. Table 7: Treated Water GWTP Distribution Header

- Chlorine mg/L Turbidity NTU 2017 Monthly Average SCADA Grab Sample SCADA Grab Sample January 1.64 0.20 February 1.49 0.19 March 1.53 0.22 April 1.37 0.25 May 1.35 0.32 June 1.38 0.27 July 1.41 1.37 0.25 August 1.39 1.36 0.15 September 1.21 1.20 0.18 October 1.68 1.63 0.17 November 1.55 1.52 0.16 December 1.14 1.13 0.20 2017 Average 1.40 1.41 NA 0.21

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A comprehensive analysis is also completed for the treated water with the results provided in 2017 as shown in Table 8. Table 8: Treated Water Comprehensive Annual Analysis

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Distribution Sampling within the distribution system is also completed to ensure the water remains safe within the pipes and to monitor for water quality degradation so that remedial action can be taken when necessary. Four bacterial samples are taken monthly, two samples on a bi-weekly rotation, by the Grindrod water system operator and sent to an accredited laboratory (CARO Environmental). Three times a year, RDNO water quality staff sample the distribution and source water in conjunction with treatment plant discharge monitoring. Tables 7 and 8 provide the results of the bacterial sampling completed in 2017 with no positives for either total coliforms or E.coli. Table 9: Distribution Bacteriological Sample Site Results

Grindrod Distribution Sample Sites

# Bacterial samples sent to Caro Analytical Laboratories

Results

Mayberry Country Store 16 All samples <1 for E. coli and Total Coliforms James St. SS 13 All samples <1 for E. coli and Total Coliforms Fourth Ave. SS 18 All samples <1 for E. coli and Total Coliforms Total Samples 47 All samples <1 for E. coli and Total Coliforms

Table 10: Distribution Bacteriological Summary for the Three Distribution Sites Total Coliform (CFU/100 mL) E.coli (CFU/100 mL) Minimum <1 <1 Maximum <1 <1 Average <1 <1 Count 47 47

The IH website also posts the monthly bacterial results for the Grindrod water system which can be found at www.interiorhealth.ca/YourEnvironment/DrinkingWater/Pages/default.aspx. Table 8 provides the field parameters collected throughout the distribution systems. Samples from a number of sites are collected, with the sample from the distribution header acting as the GRW’s “first customer”. The results are used to ensure adequate treatment and contact time has occurred. Trihalomethane’s (THM) samples are also collected from the distribution system three (3) times per year since 2010. THMs are organic compounds formed as a by-product of disinfection. Ten distinct THM compounds are possible but only four occur to any significant degree in treated drinking water:

• Chloroform • Bromodichloromethane • Dibromochloromethane • Bromoform

Collectively the above 4 THMs are referred to as Total trihalomethane’s (TTHMs). TTHMs are formed when chlorine and/or bromine react with organic matter naturally present in water. The level of TTHMs in treated water will depend on numerous factors including: total organic carbon, temperature, pH, bromide ion concentration, chlorine dose and water age.

http://www.interiorhealth.ca/YourEnvironment/DrinkingWater/Pages/default.aspx

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The Maximum Allowable Concentration (MAC) of TTHMs in distribution water is 0.1 mg/L. Table 8 provides a graph showing the TTHMs results in 2017, in which were all compliant with the MAC concentrations. Sample are taken at the treatment plant and also at the sample station closest to the end of the line which shows how much TTHM formation occurs within in distribution system with time. Generally there is a small amount of TTHMs produced in the fall months, however it is still well within standards. This is likely due to the source water still being at a higher temperature with a reduction in system water use. In March, the water temperature is much colder slowing TTHM formation and in July, system flows are much higher due to outdoor watering reducing water age and time to form TTHMs. Table 11: THM Results for 2017

Water Treatment Effluent Water is backwashed through the filter occasional to clean the filter during the regular operation of the plant, the resulting effluent is directed to the storage pond onsite. Three times a year the effluent is monitored to ensure compliance with a discharge permit issued by the Ministry of Environment. Each time the filter is backwashed, a solution of sodium thiosulphate is added to remove chlorine before the water enters the effluent storage pond. The effluent water from the pond either infiltrates into the ground or flows by gravity in the ditch parallel to the highway and then into the river. EMERGENCY RESPONSE / NOTIFICATION A comprehensive GRW Emergency Response Plan (ERP) was completed in 2013 with a comprehensive update to be completed in 2018. Sampling Training and RDNO small utility ERP training for the Operators is completed annually and occurred in April 2017. RDNO Utilities staff, as well as the Operators are all instructed on how to use the following supporting documents in times of water quality changes or emergencies:

1. GRW Emergency Response Plan, and 2. GRW Water Quality Deviation Response Plan.

The above documents contain the contacts, criteria, and procedures necessary to assist operators and staff to make timely, informed decisions. Staff participate in mock emergency training scenarios annually.

0

0.02

0.04

0.06

0.08

0.1

0.12

March 22 July 27 November 23 TTHM 1-3average

mg/

L

Grindrod System 2017 TTHM

Grindrod Plant - Treated Fourth Ave SS GCDW IMAC

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GRW must inform customers when their drinking water is not safe to consume or use. A Water Quality Advisory is released when the water poses a modest health risk. A Boil Water Notice is released when there is a known or possible health impact to the customer. An advisory or notice is delivered as quickly and efficiently as possible. Notification may include “Alert” road signs, radio and/or media releases. Under specific circumstances notification is hand-delivered. In 2018, the RDNO developed a new method to provide notification to its customers about announcements, media releases and updates. Customers are advised to subscribe to the Grindrod Water Mailing List by going to www.rdno.ca and clicking on “Subscribe for Updates” and subscribe for Grindrod Water email updates (Figures 1 and 2). Figure 1: RDNO Notification to Subscribe for Announcements

Figure 2: RDNO Notification to Subscribe for Grindrod Water Announcements

All incidents are recorded, tracked and reviewed for ways to reduce risk from a similar incident in the future. Table 9 provides a summary of two incidents that occurred at GRW in 2017 which included a process pump failure and a fuel spill on the Shuswap River.

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Table 12: Grindrod Incident Report

Incident # Date Reported Root Cause (equip?) Trigger Event Status1 Action Items required or completed (Time

line or Date of completion)

Long Term Action Items - how addressed (if closing off file) - i.e. strategic plan, other?

17-009 8-May-17 High Turbidity in Shuswap River

Grindrod WTP was able to produce water at 0.7 NTU at a flow rate of 40 USgpm (normally runs at 55 USgpm), however Raw water from Shuswap River had reached 95 NTU on May 7. Incident level increased May 11 when PAC pump failed after system was restarted. This caused incomplete water treatment, introducing high turbidity water into treated water reservoir.

CMP The Plant was shut off by WM on May 7 as a precautionary measure. Water distribution system operating on storage. Notified Enderby Fire Department of limited supply, but if they need water they can use a pump to take water direct from river. Signs were set out instructing residents to reduce consumption. The plant was running at 40 gpm when shut off. River Turbidity dropped to 30 NTU on May 10. Plant was started up at 30 gpm and was producing 0.3 NTU. PAC pump failed overnight of May 10 to 11 and Plant continued to operate, introducing higher turbidity water into the reservoir. PAC pump was repaired on the morning of May 11, but Turbidity of distribution water increased to above 1 NTU. WQA was issued. WQA was rescinded on Thursday May 18.

Proposed works include installation of turbidity meter immediately after treatment plant, and another before treatment plant on raw water.

17-012 16-May-17 Fuel Spill Shuswap River Fuel Spill from tanker truck single vehicle accident near Shuswap River, upstream of Ashton Creek

CMP Intake was shut off May 16. Fuel spill response was handled by Ministry of Environment (MoE). MoE determined that no fuel or negligible fuel had reached the river, IHA advised there was little to no threat to the Grindrod water supply, water system was returned to normal operation May 18.

Water sample was taken at river surface when system was turned back on, to test for hydrocarbons.

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CUSTOMER CALLS AND RESPONSE In 2017, there were no customer calls relating to Water Quality. CAPITAL AND IMPROVEMENT PROJECTS Each year staff assess projects to be completed to maintain or improve service to GRW customers. Projects can include studies, new equipment, new facilities or renewal of assets. The following is a list of capital and other improvement projects completed or started in 2017:

• A consultant was hired to design improvements to the Grindrod water intake, with the intent to reduce sediments in the treatment plant and reduce the demand on the programmable backwash system. One of three options presented in the consultant’s report, the installation of two hydrocyclones, was completed. The hydrocyclones remove most of the heavier sediments before the water enters the treatment plant. The other two options were deemed to be too expensive with unknown and possibly little benefit.

• Two turbidity analyzers were installed in 2017. The existing analyzer measures turbidity after treatment, after the water has traveled through the reservoir and is being pumped out to the distribution system. One of the new analyzers has been installed before the treatment plant to provide the operator a means to monitor source water turbidity and anticipate the need to slow the flow rate to the plant. The second new analyzer was installed immediately after the treatment plant, before the reservoir, to monitor plant effectiveness and help identify a plant process failure. SCADA settings shut off flow to the plant if/when required, and potential problems can be corrected before the water reaches the reservoir.

• The Programmable Logic Controller (PLC) was scheduled for replacement in 2017 and was completed in January, 2018. The old PLC was obsolete, having outlived its service life. During this project the SCADA system (remote monitoring software) was upgraded, and the backwash cycle counter was repaired. The new PLC is also an upgrade from the old and when combined with the new SCADA system allows better control of the treatment plant.

LONG TERM IMPROVEMENTS There is a low level of development in Grindrod and the water system has remained static, with only a few additional customers connecting since 2012. Existing water treatment at Grindrod does not meet IH guidelines, and improvements are required. Section 7.1.2 of the Enteric Viruses Technical Document of the Health Canada Guidelines for Canadian Drinking Water Quality, and section 7.1.2 of the Turbidity in Drinking Water Consultation Document of the 2011 Health Canada Guidelines, refer to the treatment process of flocculation/clarification/filtration employed at the Grindrod packaged water treatment plant as “conventional treatment”, receiving 2 log credit for viruses and 3 log credit for protozoa. However, the packaged plant installed at Grindrod was not designed, constructed and approved under the IH “Policy Statement on Pre-Engineered Water Treatment Plants” adopted April 1997 (Appendix D), and as noted in the “Observations and Recommendations of the IHA routine inspection water supply system report”, dated January 20, 2014 (Appendix E), IH specifies that the packaged plant provides “direct filtration”, which qualifies for 1 log removal credit for viruses and 2 log removal credit for giardia and cryptosporidium.

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Furthermore, because of high agricultural activity along the banks of the river upstream of Grindrod and Enderby, the Public Health Engineer has recommended elevated 5-4-2-1-0 treatment objectives. RDNO is working with IH to review these higher water quality objectives. Installation of Ultraviolet (UV) treatment and other alternatives are also being investigated as a possible solution to resolve this issue. A long term plan for the GRW is being developed to ensure the sustainability of the water system that will examine further treatment requirements, as well as building an operating reserve and a sustaining capital reserve. CLOSING The Grindrod Water Utility follows the requirements in BC’s Drinking Water Protection Act and Regulations. RDNO staff in conjunction with the operator, continue to work hard to ensure the highest quality standards are met for the delivery of safe, clean drinking water to our customers. In 2017, three (3) improvement projects were completed. 178 water quality tests were performed on the untreated water supply and 474 on the treated water distribution system. GRW met the CDWQ and the DWPR as per the distribution bacterial sampling summary in Table 5. RDNO is pleased to present the 2017 GRW 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 RDNO at 250-550-3700 or email [email protected].

mailto:[email protected]

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APPENDIX A – WATER QUALITY SAMPLING SCHEDULE

GRINDROD Water Quality Program for 2017

Sampling Schedule: Grindrod Revision Date: January 2017 CH

January Operator 1st and 3rd week of the monthFebruary Operator 1stand 3rd week of the monthMarch Operator & GVW 1st week, GVW planned for March 22April Operator 1st and 3rd week of the monthMay Operator 1stand 3rd week of the monthJune Operator 1st and 3rd week of the monthJuly Operator & GVW 1st week, GVW planned for July 27August Operator 1st and 3rd week of the monthSeptember Operator 1stand 3rd week of the monthOctober Operator 1st and 3rd week of the monthNovember Operator & GVW 1st week, Planned for November 23December Operator 1st and 3rd week of the month

Sampling

Chlorine TurbidityDistribution - BacterialRaw - Bacterial, In house bottleRequisition SheetsCalibration

Bottle Drop off

WaterTrax ID#9C079C087181360903608F9C009BFD

** Note - RDNO will begin monitoring the manganese levels in the raw water starting in 2017. The operator will take an in house sample once a month, and a sample will be sent to Caro from the RDNO WQ triannual samples.

Bring Bottles to RDNO to send to Caro for analysis

Mayberry Store

Grindrod Sample Sites

James St. SS Fourth Ave. SS

*NOTE: The surecrop site and Elementary school site are only to be sampled if there are issues with the samples stations or more samples for the system are required. (New 2017)

Grindrod Sampling Schedule 2017

Sites

Grindrod Treatment Plant - treated

*Sure Crop*Grindrod Elementary School

Sampling will occur the fourth week of every month (exception: December due to Christmas)

at all distribution sites use handheld meter and log dataat all distribution sites take 1 - Caro Bacterial

Operator Tasks

raw water take 1 - Caro Bacterial, and 1 in house raw water sample

Grindrod Treatment Plant - untreated

at all distribution sites use handheld meter and log data

All bacterial samples have requisition sheets for IHA Bring in Instruments to RDNO according to schedule

APPENDIX "A"

GRINDROD Water Quality Program for 2017

Sampling Schedule: Grindrod Revision Date: January 2017 CH

If the operator needs to drop of the samples themselves. Below are the health unit options.

GVW Sampling (Tri-annual sampling - March, July and November)

Calibration by GVW:Online: turbidity when new one is installedHandheld Chlorine Hach Pocket colorimeter

Turbidity/Chlorine Hanna - HI-93414 Turbidity and ChlorineDO Hanna HI-9146 Dissolved Oxygen

NOTE: calibration reagents are stored at the Grindrod Treatment PlantNOTE: operator calibrates online chlorine analyzerNOTE: DO probe does not work - need a new one

*Note - Operator should bring in handheld instruments for calibration according to the instrument schedule provided (4 times/ year) (New 2017 GL & KP)

Salmon Arm Health Centre851 - 16 Street NE Salmon Arm, BC250-833-4100Water Sample drop off: Monday, Tuesday or Wednesday by 2 pm

Interior Health Unit InformationEnderby Community Health Centre707 - 3rd Avenue Enderby, BC250-838-2450Water Sample drop off: Wednesday by 12 noon

APPENDIX "A"

GRINDROD

Sampling Schedule: GrindrodRevision Date: December 7, 2016

Completed by: GL

Tri-annuallyDistribution & Untreated March, July, NovemberTHMs March, July, NovemberGrindrod effluent March, July, NovemberSource Water (Annual) JulyTreated Water (Annual) July

WaterTrax ID#9C079C087181360903608F9C009BFD

Grindrod Sample SitesSites

*NOTE: The surecrop site and Elementary school site are only to be sampled if there are issues with the samples stations or more samples for the system are required. (New 2017)

Grindrod Treatment Plant - untreatedGrindrod Treatment Plant - treatedMayberry StoreFourth Ave. SS James St. SS *Sure Crop*Grindrod Elementary School

APPENDIX "A"

GRINDROD

Sampling Schedule: GrindrodRevision Date: December 7, 2016

Completed by: GL

ANNUALS (JULY)Site and Water Trax # Bottles Parameters

1 - Caro Baterial Total Coliform, E.Coli1 - PA MPN1 - 250 mL metals1 - Cyanide Cyanide1 - TOC TOC1 - 1 L Caro1 - 1 L Algae Density algae density1 - 4 L Caro chlorophyll a1 - Caro Baterial Total Coliform, E.Coli1 - PA MPN1 - 250 mL metals1 - Cyanide Cyanide1 - TOC TOC1 - 1 L Caro1 - THM THM1 - 1 L Algae Density algae density1 - 4 L Caro chlorophyll a

TRI ANNUAL SAMPLES (MARCH, JULY, NOVEMBER)

Grindrod Effluent (March, July, November)Site and Water Trax # Bottles Parameters

1 - Caro Bacterial Total Coliform, E.Coli1 - 125 mL Metals2 - 1 L Caro composite sample

Note: composite sample: fill 1/4 of each 1 L bottle every 1/2 hour

Distribution Sites (March, July, November) Sites and Water Trax # Bottles Parameters

1 - Caro Bacterial Total Coliform, E. Coli 1 - THM THM

Grindrod Treatment Plant Samples (MARCH, NOVEMBER)Sites and Water Trax # Bottles Parameters

1 - Caro Bacterial Total Coliform, E. Coli

1 - Metals Total Manganese

1 - Caro Bacterial Total Coliform, E. Coli

1 - TMH TMH

Grindrod - Treated9C08

Total Coliform, E. Coli

Total Coliform, E. Coli

Grindrod - Untreated9C07

Fourth Ave. SS 36090James Street SS3608F

Mayberry Store 7181

1 - Caro Bacterial

1 - Caro Bacterial

Grindrod EffluentCBD3

Grindrod - Untreated9C07

Grindrod - Treated9C08

APPENDIX "A"

Jan 2 - 6 July 3 -7Distribution (Mayberry, Fourth St. SS)

Jan 9 - 13Distribution (Mayberry, Fourth St. SS)

July 10 - 14

Jan 16-20 July 17 - 21

Jan 23 - 27Distribution (GRWTP - Treated, James St)

July 24 - 28Distribution (GRWTP - Treated, James St)

Jan 30 - Feb 3 July 31 - Aug 4

Feb 6 - 10Distribution (Mayberry, Fourth St. SS)

Aug 7 - 11Distribution (GRWTP - Treated and untreated, Fourth St); THMs; Annuals

Feb 13 - 17 Aug 14 - 18

Feb 20 - 24Distribution (GRWTP - Treated, James St)

Aug 21 - 25Distribution (Mayberry, James St. SS)

Feb 27 - Mar 3 Aug 28 - Sept 1

Mar 6 - 10Distribution (Mayberry, Fourth St. SS)

Sep 4 - 8Distribution (Mayberry, Fourth St. SS)

Mar 13 - 17 Sep 11 - 15

Mar 20 - 24Distribution (GRWTP - Treated and untreated, James St); THMs

Sep 18 - 22Distribution (GRWTP - Treated, James St)

Mar 27 - 31 Sept 25 - 29

Apr 3 - 7Distribution (Mayberry, Fourth St. SS)

Oct 2 - 6Distribution (Mayberry, Fourth St. SS)

April 10 - 14 Oct 9 - 13

Apr 17 - 21Distribution (GRWTP - Treated, James St)

Oct 16 - 20Distribution (GRWTP - Treated, James St)

Apr 24 - 28 Oct 23 - 27

May 1 - 5Distribution (Mayberry, Fourth St. SS)

Oct 30 - Nov 3

May 8 -12 Nov 6 - 10Distribution (Mayberry, Fourth St. SS)

May 15 - 19Distribution (GRWTP - Treated, James St)

Nov 13 - 17

May 22 - 26 Nov 20 -24Distribution (GRWTP - Treated and untreated, James St); THMs

May 29 - Jun 2 Nov 27 - Dec 1

Jun 5- 9Distribution (Mayberry, Fourth St. SS)

Dec 4 - 8Distribution (Mayberry, Fourth St. SS)

Jun 12 - 16 Dec 11 - 15

Jun 19 - 23Distribution (GRWTP - Treated, James St)

Dec 18 -22Distribution (GRWTP - Treated, James St)

Jun 26 - 30 Dec 25 - 29

Grindrod Sampling 2017

APPENDIX "A"

18


APPENDIX B – DISTRIBUTION SYSTEM MAP

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4th Ave

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Enderby Grindrod Rd

Tomkinson Rd

Dave

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Halksworth Rd

Crandlemire Rd

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APPENDIX "B"

19


APPENDIX C - CONTACT TIME

Completed by: ZMUpdate (JdeP): August 29, 2018 Date Printed: 12/3/2018, 1:51 PM

Grindrod Water Utility - Chlorine Contact Time Calculations

40.0 m Reservoir Length (5 cells x 8m each)2.44 m Reservoir interior height floor to ceiling2.29 m Reservoir maximum water depth (100%)1.95 m Reservoir operating depth at high water level = 85%1.72 m Reservoir operating depth at low water level = 75%1.15 m Reservoir operating depth at 50%2.84 m Reservoir Width of cell195 m3 Reservoir Volume (V) at low water level 75%130 m3 Reservoir Volume (V) at 50%

62.7 U.S.gpm Flow (peak hourly - assumed 3x average day demand)*4.0 L/s Flow (Q) peak hourly1.3 L/s Flow (Q) Average Day Demand (ADD)

822 minutes Theoretical Detention Time (TDT) = V/Q (peak hourly) at 75%2466 minutes Theoretical Detention Time (TDT) = V/Q (ADD) at 75%1644 minutes Theoretical Detention Time (TDT) = V/Q (ADD) at 50% Volume

0.5 Baffling Factor (4 baffle walls, 1 weir, Average Baffling Condition) 411 minutes Contact Time (CT) in Reservoir at peak hourly flow (TDT * Baffling Factor) at 75%

1233 minutes Contact Time (CT) in Reservoir at ADD flow (TDT * Baffling Factor) at 75%

822 minutes Contact Time (CT) in Reservoir at ADD flow (TDT * Baffling Factor) at 50%

*flow as calculated in document "grindrod water treatment - CT calculations summer 2008" October 30, 2012As GRW is filter treated, the water parameters are generally consistent with little to no change in chlorine demand.

CT calculation for 1st customer - sampling point in pump house after reservoir

Cl2 Residual mg/L (free)

Cl2 Injection mg/L pH raw water

Raw Water temp °C

CTa

(achieved)=

(Cl2 * CT in reservoir)

Virus CTr

(required) (4-Log)

CTa/CTr

(Virus)CT (Virus)

% Achieved

CTr

(Giardia) (3-Log)

CTa/CTr

(Giardia)

CT (Giardia) % Achieved

Reservoir at 75% Minimum Minimum Average Average min-mg/L min-mg/L RequiredPeak Hourly Flow, Avg. Temp 1.26 2.00 7.50 9.0 517.9 8.0 64.74 100.00 175 2.96 100.00Peak Hourly Flow, Winter Temp 1.26 2.00 7.50 0.5 517.9 12.0 43.16 100.00 246 2.11 100.00Peak Hourly Flow, Summer Temp 1.26 2.00 7.50 12.0 517.9 6.0 86.31 100.00 131 3.95 100.00Reservoir at 75%Normal Flow (ADD), Avg. Temp 1.26 2.00 7.50 9.0 1553.7 8.0 194.21 100.00 175 8.88 100.00Normal Flow (ADD), Winter Temp 1.26 2.00 7.50 0.5 1553.7 12.0 129.47 100.00 246 6.32 100.00Normal Flow (ADD), Summer Temp 1.26 2.00 7.50 12.0 1553.7 6.0 258.94 100.00 131 11.86 100.00Reservoir at 50%Normal Flow (ADD), Avg. Temp 1.26 2.00 7.50 9.0 1035.8 8.0 129.47 100.00 175 5.92 100.00Normal Flow (ADD), Winter Temp 1.26 2.00 7.50 0.5 1035.8 12.0 86.31 100.00 246 4.21 100.00Normal Flow (ADD), Summer Temp 1.26 2.00 7.50 12.0 1035.8 6.0 172.63 100.00 131 7.91 100.00

Notes:1. Normal CL2 residual range at reservoir is 1.0 to 1.5 mg/L2. Temperature average is about 9°C with a low of near 0°C3. Minimum Free Chlorine from SCADA4. IHA correspondence of January 20, 2014 indicates the Grindrod Package WTP receives 1 Log removal credit for viruses, and 2 Log removal credit for protozoa (giardia and cryptosporidium) and further, recommends that the water treatment requirements for the Grindrod Water system are:

Achieved1 Log removal credit, and 4 Log chlorine CT

filtration and chlorination1 for less than 1 NTU of turbidity with a target of 0.1 NTU0 total and fecal coliforms and E. coli

*chlorine does not affect cryptosporidium so for this requirement the Total Achieved is 2 Log which is insufficient for IHA water treatment requirements

5 log inactivation of viruses ……………………………………………………………….4 log removal or inactivation of protozoa ………………………………………………...

2 refers to two treatment processes for all surface drinking water systems …………..

Requirement

2 Log removal credit (giardia&crypto), 2 Log chlorine CT (giardia), and 0 Log chlorine CT (crypto)*

APPENDIX "C"

20


APPENDIX D - POLICY STATEMENT ON PRE-ENGINEERED WATER TREATMENT PLANTS

xiii

POLICY STATEMENT ON

PRE-ENGINEERED WATER TREATMENT PLANTS Pre-engineered water treatment plants are normally modular process units which are pre-designed for specific process applications and flow rates and purchased as a package. Multiple units may be installed in parallel to accommodate larger flows. Pre-engineered treatment plants have numerous applications but are especially applicable at small systems where conventional treatment facilities may not be cost effective. As with any design the proposed treatment must fit the situation and assure a continuous supply of safe drinking water for water consumers. The reviewing authority may accept proposals for pre-engineered water treatment plants on a case-by-case basis where they have been demonstrated to be effective in treating the source water being used. In most cases an applicant will be required to demonstrate, through pilot studies and/or other data, adequacy of the proposed plant for the specific application. A professional engineer is required to prepare plans and specifications for submittal to the reviewing authority for approval. It is recommended that a professional engineer be on site to oversee the installation and initial startup of pre-engineered water treatment plants. Factors to be considered include: 1. Raw water quality characteristics under normal and worst case conditions. Seasonal fluctuations

must be evaluated and considered in the design. 2. Demonstration of treatment effectiveness under all raw water conditions and system flow demands.

This demonstration may be on-site pilot or full scale testing or testing off-site where the source water is of similar quality. On-site testing is required at sites having questionable water quality or applicability of the treatment process. The proposed demonstration project must be approved by the reviewing authority prior to starting.

3. Sophistication of equipment. The reliability and experience record of the proposed treatment

equipment and controls must be evaluated. 4. Unit process flexibility which allows for optimization of treatment. 5. Operational oversight that is necessary. At surface water sources full-time operators are necessary,

except where the reviewing authority has approved an automation plan. See Policy Statement on Automated/Unattended Operation of Surface Water Treatment Plants.

6. Third party certification or approvals such as National Sanitation Foundation (NSF), International

Underwriters Laboratory (UL) or other acceptable ANSI accredited third parties for; a) treatment equipment and b) materials that will be in contact with the water.

7. Suitable pretreatment based on raw water quality and the pilot study or other demonstration of

treatment effectiveness. Pretreatment may be included as an integral process in the pre-engineered module.

8. Factory testing of controls and process equipment prior to shipment. 9. Automated troubleshooting capability built into the control system. 10. Start-up and follow-up training and troubleshooting to be provided by the manufacturer or contractor.

APPENDIX "D

xiv

11. Operation and maintenance manual. This manual must provide a description of the treatment, control and pumping equipment, necessary maintenance and schedule, and a troubleshooting guide for typical problems.

12. In addition to any automation, full manual override capabilities must be provided. 13. Cross-connection control including, but not limited to the avoidance of single wall separations

between treated and partially or untreated surface water.

14. On-site and contractual laboratory capability. The on-site testing must include all required continuous and daily testing as specified by the reviewing authority. Contract testing may be considered for other parameters.

15. Manufacturer’s warranty and replacement guarantee. Appropriate safeguards for the water supplier

must be included in contract documents. The reviewing authority may consider interim or conditional project approvals for innovative technology where there is sufficient demonstration of treatment effectiveness and contract provisions to protect the water supplier should the treatment not perform as claimed.

16. Water supplier revenue and budget for continuing operations, maintenance and equipment

replacement in the future. 17. Life expectancy and long-term performance of the units based on the corrosivity of the raw and

treated water and the treatment chemicals used.

Additional information on this topic is given in the State Alternative Technology Approval Protocol dated June 1996, which was developed by the Association of State Drinking Water Administrators, U.S. Environmental Protection Agency and various industry groups. Adopted April, 1997 Revised April, 2007 Revised April, 2012

APPENDIX "D

21


APPENDIX E - OBSERVATIONS AND RECOMMENDATIONS OF THE IHA ROUTINE INSPECTION WATER SUPPLY SYSTEM REPORT

WATER SUPPLY SYSTEM REPORT

1440 , 14th Avenue Vernon, BC V1B 2T1

Phone Number: (250) 549-5714 Fax Number: (250) 549-6367

Interior Health Authority

Grindrod/MaraCommunity:

Zee MarcolinContact Name:

Inspection Date: October 30, 2012

Report Number: 13-250-00490-9Grindrod Water System

North Okanagan Regional District

6920 Highway 97A

Grindrod, BC

0450115Facility Number:Facility Information:

004277

Site Phone: 250-838-7990

Permit Number:

Facility Category: Water System 15-300 Connections, Government

Routine: GeneralInspection Type:

Information ExchangedAction(s) Taken:

October 30, 2014Next Routine Date:

Medium SeveritySeverity Rating:

Delivery Method: Electronic Mail

Announced inspection conducted to check compliance w/ Drinking Water Protection Act & Regulation. In attendance was

Operator, RDNO Manager & Interior Health.

Inspection details:

-Source is a screened intake located on bottom of Easterly channel of Shuswap River just North of bridge. Divers inspected

intake in Spring. Polyethylene supply line flows by gravity to wet well on shore located adjacent to effluent settling pond.

Submersible pump in wet well delivers raw water through a vortex degritter (problems w/ sand) to the package water treatment

plant located in building

-Treatment: Coagulation, flocculation, clarification & filtration. Flows normally @ 55 gal/min (20 NTU) & 35 gal/min during spring

freshet when raw water turbidity can be 100 NTU. After filtration water is chlorinated using 2 peristaltic pumps set @ 50% (1-1.2

ppm winter & 1.5 ppm spring freshet) before flows by gravity to underground 2 celled baffled reservoir (63,300 USgal) w/ outlet

on opposite side. (2) pumps-1 constant/1 variable (demand/backwash) deliver treated water to distribution system. Online

turbidity & chlorine analyzers on distribution line

-Outside ventilation kicks on when plant running w/ chlorine & coagulant (poly aluminum chloride). Stays on after to vent chlorine

fumes

-Filter backwash is dechlorinated w/ sodium thiosulphate before entering backwash storage pond. Dredged ~2 yrs ago & only

when starts to overflow

-SCADA system monitors chlorine residual, turbidity & reservoir height. Reservoir levels alarmed. Set points to be added for

chlorine & turbidity. Auto dial-out to 8 phone #'s (operator & RDNO) & loops until acknowledged. Test for dial-out possible

-50 connections (43) residents, (1) institution (BF-checked annually), commercial & school (BF-doing rounds). No

irrigation/agriculture

-ERP all RDNO been redone, currently under review. To be submitted to IH for filing

-Air gap to reservoir & backwash

-Signage onsite for BWN, WQA & flushing

-Monthly reports for bacteriological testing (total coliform & E. coli)

Opening Comments and Observations:

Observations and Recommendations

Operational: 304 - Inadequate Water Quality / Disinfection / Treatment /

Quantity

1 New: 1 / Resolved: 0 Priority: Priority: High Priority

Page 1 of 30450115 (13-250-00490-9)

APPENDIX "E"

NO Electoral Area F

January 20, 2014

Grindrod Water System


Report Date:

Community:

Facility Contact:

Observations and Recommendations

Operational: 304 - Inadequate Water Quality / Disinfection / Treatment /

Quantity

Correspondence from PHE in 2010 stated:

The filtration system is a packaged treatment plant, approved under CP 4-376 in 1998. As this is direct filtration it receives

1-log removal credit for viruses and 2-log removal credit for protozoa (Giardia & Cryptosporidium). The disinfection is with

liquid hypochlorite. We have not found any calculations in the file but correspondence from the previous PHE indicates it

received 4-log inactivation of viruses and 2-log inactivation of Giardia. The 2-log inactivation of Giardia is not sufficient for

Cryptosporidium. As a result the combined credits achieved through the treatment plant are:

-5 log inactivation of viruses

-2 log removal or inactivation of protozoa

-2 refers to two treatment processes for all surface drinking water systems

-1 for less than 1 NTU of turbidity

Please inform IH if there is updated information for determining the treatment credits.

30420 - Failure to maintain 3 Log Giardia protection

Recommendation for water treatment requirements for Grindrod Water System for use of the Shuswap River were

clarified in 2010 correspondence from PHE to be:

-5 log inactivation of viruses

-4 log removal or inactivation of protozoa

-2 refers to two treatment processes for all surface drinking water systems

-1 for less than 1 NTU of turbidity with a target of 0.1 NTU

-0 total and fecal coliforms and E. coli

The elevated treatment objective is due to high agricultural activity along the banks of the river upstream of

Enderby/Grindrod.

Please inform IH if there is updated information for determining the treatment credits.

This is an issue that needs to be discussed with RDNO in the future.

Operational: 305 - Inadequate Analysis Data / Monitoring of Water Quality

2 New: 1 / Resolved: 0 Priority: Priority: High Priority

Turbidity data (raw & finished) is not part of the report to the DWO.

30520 - Inadequate recording of required data

Due to the seasonal fluctuations in turbidity seen in the Shuswap River during freshet it would be helpful to have

the turbidity data reported to the DWO.

Please start reporting the raw and filter effluent turbidity data to the DWO as part of your monthly report.

3 New: 1 / Resolved: 0 Target Completion Date: June 30, 2014 Priority: High Priority

Last chemical analysis on file is from September 23, 2004.

30510 - Inadequate chemical sampling data

Please submit results for an updated complete chemical analysis for this water system to the DWO.

Please include in the testing trihalomethanes to determine if they are present/elevated during freshet.

Please time this analysis with spring freshet.

Operational: 309 - Inadequate Emergency Response Plan /

Implementation

4 New: 1 / Resolved: 0 Target Completion Date: March 31, 2014 Priority: Low Priority

Last Emergency Response Plan (ERP) on file is from November 2008.

30910 - Emergency Response Plan has not been updated to include additional hazards / revised contact lists / etc.

Please submit an updated ERP for this water system.

Amendments/Addendums

Page 2 of 30450115 (13-250-00490-9)

APPENDIX "E"

NO Electoral Area F

January 20, 2014

Grindrod Water System


Report Date:

Community:

Facility Contact:

Amendments/Addendums

10/30/2012 Selena Russell

Recommendations:

-The storage reservoir should be checked routinely for sediment, slime & staining, and cleaned & sanitized accordingly.

Waste water to be sent to waste and not the end potable water uses.

-To maintain a reasonable supply of water, the water in the storage reservoir should be turned over regularly. In a municipal

reservoir it is considered good practice to turnover the reservoir at least every 5-7 days.

-Provide a chlorine contact time based on the combined flow rate of the two pumps and the minimum reservoir volumes

(lowest volume setpoint). See attached to determine if there are any changes since 2008 submission.

-It is industry practice to monitor the filter effluent with an online turbidity analyzer & particle counter. Online turbidity

analyzer should be directly after filtration prior to chlorination.

-Based on information submitted (see attached) in 2008 the chlorine treatment was providing a 5-log inactivation of viruses;

however, treatment for protozoa (i.e. 4-log reduction) is deficient. Your attention in this regard would be appreciated.

Please note that Interior Health Authority has gone live with inspection reports and they are now available for viewing by the public

at: http://www.interiorhealth.ca/YourEnvironment/InspectionReports/Pages/default.aspx. Currently only routine and routine

follow-up inspections are posted.

Water advisories, inspection reports, bacteriological and chemical drinking water sample results in our database can be found at:

http://www.interiorhealth.ca/YourEnvironment/DrinkingWater/Pages/AdvisoriesNotifications.aspx

Current compliance and enforcement activities may be found at:

http://www.interiorhealth.ca/YourEnvironment/EnforcementAction/Pages/default.aspx

Please note any works required for bringing a water system into compliance (including improvements, extensions, alterations,

installations or new construction) requires a Construction Permit & approvals from Public Health Engineering (1-855-743-3550 or

250-770-5540) prior to commencing construction or installations.

Closing Comments:

250 Selena Russell, Environmental Health Officer

I have read and understood this report Inspector

Zee Marcolin

Page 3 of 30450115 (13-250-00490-9)

APPENDIX "E"

grindrod water utility 2017 annual report · the grw water system draws water from the shuswap...

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