Mabel Lake Water Utility 2017 Annual Report · Mabel Lake Water Utility 2017 Annual Report The MLW system is comprised of the following: An intake located in Mabel Lake approximately

Mabel Lake Water Utility 2017 Annual Report

Regional District of North Okanagan Prepared for: Interior Health & RDNO 9848 Aberdeen Road Prepared by: Keiko Parker, Water Quality Technician Coldstream, BC Contributor: James de Pfyffer, Small Utilities Manager V1B 2K9 Submitted: February 2019

i


TABLE OF CONTENTS

INTRODUCTION ....................................................................................................................... 1

MLW WATER SYSTEM ............................................................................................................. 1

System Overview .................................................................................................................... 1

Treatment Requirements ........................................................................................................ 2

MAINTENANCE ......................................................................................................................... 3

Water Mains ............................................................................................................................ 3

Flushing Program ............................................................................................................... 3

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

SOURCE ASSESSMENTS AND SOURCE RESPONSE PLANS .............................................. 4

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

2017 MLW Sampling Program and Schedules 5

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

Chemical, Physical Summary ............................................................................................. 6

Turbidity ............................................................................................................................. 8

UV Transmissivity ............................................................................................................... 9

Total Organic Carbon (TOC) .............................................................................................12

Bacteriological Summary ...................................................................................................13

Treated Water ....................................................................................................................... 15

Chlorine Monitoring ...........................................................................................................15

Water Distribution System ..................................................................................................... 16

Bacteriological Summary ...................................................................................................16

Chemical Summary ...........................................................................................................17

Disinfection By-Products (DBP) in Distribution Water ........................................................18

WATER USAGE .......................................................................................................................20

EMERGENCY RESPONSE / NOTIFICATION ..........................................................................22

INCIDENTS ..............................................................................................................................24

CROSS CONNECTION CONTROL PROGRAM .......................................................................24

LONG TERM IMPROVEMENTS ...............................................................................................25

WORKS COMPLETED IN 2017 AND PREVIOUS YEARS .......................................................25

2018 WORK PLAN ...................................................................................................................26

LONG TERM TREATMENT IMPROVEMENTS ........................................................................26

CONCLUSION ..........................................................................................................................27

REFERENCES .........................................................................................................................28

APPENDIX A - MLW WATER SYSTEM MAP

APPENDIX B - MLW SAMPLE SITES MAP

APPENDIX C - 2017 MLW SAMPLING PROGRAM and SCHEDULES

APPENDIX D - MLW CL2 CONTACT TIME

APPENDIX E - MLW UV SCHEMATIC

ii


TABLES

Table 1: Monitoring schedule for sample sites in 2017. ............................................................. 6 Table 2: Parameters and frequency sampled within the distribution in 2017. ............................. 6 Table 3: Parameters and frequency sampled for raw water in 2017. .......................................... 6 Table 4: Raw water (untreated) comprehensive annual analysis at Mabel Lake in 2017. .......... 7 Table 5: Raw water turbidity results for Mabel Lake intake in 2017. ........................................... 8 Table 6: Raw water field parameters and in-house UVT results for Mabel Lake intake in 2017 10 Table 7: Source water bacterial results for Mabel Lake intake in 2017. ....................................14 Table 14: 2017 incident summary for MLW. .............................................................................24

FIGURES

Figure 1: SCADA and grab sample turbidity for Mabel Lake raw water. .................................... 9 Figure 2: UV Transmissivity both filtered and unfiltered on raw water. .....................................11 Figure 3: UVT filtered and unfiltered compared to turbidity 2017. .............................................12 Figure 4: Mabel Lake raw water total organic carbon (mg/L). ...................................................13 Figure 5: Raw water E. coli results for Mabel Lake, <1 E. coli are being shown on the graph as

0 E. coli. ....................................................................................................................14 Figure 6: Raw water Total Coliform results for Mabel Lake, <1 Total Coliform are shown on the

graph as 0 Total Coliform. .........................................................................................15 Figure 7: TTHM average for each sample date per site with the annual average of all sites

shown as TTHM 1-2 in the figure for both sites. ........................................................19 Figure 8: Historical Mabel Lake distribution TTHM’s since monitoring began in 2010. ..............20 Figure 9: Mabel Lake water usage for 2013 to 2017 with the exception of 2015 when the flow

meter was not working properly. ................................................................................22 Figure 10: RDNO notification to subscribe for MLW updates. ...................................................23 Figure 11: RDNO mailing updates for MLW announcements. ..................................................23

iii


ACRONYMS

AWWA American Water Works Association BCAWQ British Columbia Approved Water Quality Guidelines BPD Backflow Prevention Device BWN Boil Water Notice Caro Caro Analytical Services CCCP Cross Connection Control Program

CFU Colony Forming Units COP Conditions on Permit

CT Contact Time DBP Disinfection By-Product DCC Development Cost Charge DOC Dissolved Organic Carbon DWO Drinking Water Officer DWPA Drinking Water Protection Act DWPR Drinking Water Protection Regulation DWTO Drinking Water Treatment Objectives (Microbiological) for Surface Water Supplies E. coli Escherichia coli EOCP Environmental Operator Certification Program ERP Emergency Response Plan FIS Financial Implementation Plan GCDWQ Guidelines for Canadian Drinking Water Quality IH Interior Health LPH Lakeshore Pump House MAC Maximum Acceptable Concentration MFABC Municipal Finance Authority of BC MLHC Mabel Lake Holiday Centre MLW Mabel Lake Water Utility NTU Nephelometric Turbidity Units PRV Pressure Reducing Valve RDNO Regional District of North Okanagan SCADA Supervisory Control and Data Acquisition SDWQG Surface Drinking Water Quality Guidelines SRWSP Shuswap River Watershed Sustainability Plan Teale’s Teale’s Water Utility Service THM Trihalomethanes TOC Total Organic Carbon TTHM Total Trihalomethanes TWL Top Water Level WQA Water Quality Advisory UVT UV Transmissivity

1


INTRODUCTION

As required by the British Columbia Drinking Water Protection Act (BCDWPA), the Regional District of North Okanagan (RDNO) provides the following annual report in accordance with Conditions on Permit (COP) for the Mabel Lake Water Utility (MLW). 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 MLW

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.

MLW WATER SYSTEM

System Overview

The eastern half of the MLW system, Mabel Ridge Estates, was constructed in the 1970s and operated as a private water utility until 2003 when it became a function of the RDNO and was expanded west with the development of the Mabel Lake Golf Course. It was further expanded to the west to service the Kingfisher RV Park in 2005. Appendix A provides the service boundary and properties serviced by MLW. The MLW is owned and managed by RDNO. The RDNO Manager, Small Utilities is responsible for the operation and management with oversight provided by the Utilities, General Manager and the RDNO Board of Directors. The water quality monitoring program is coordinated and monitored by the water quality staff of the RDNO. RDNO employs a contract operator to complete day to day operation and maintenance tasks. The operator is also required to respond to emergencies, 24 hours a day, 7 days a week, and have a backup operator available to respond if necessary. MLW currently provides potable water to 320 residential connections (274 single family units and 60 multi-family units) and 3 commercial connections. The majority of connected residents and all 3 commercial connections are seasonally occupied, with approximately 20 connections considered to be occupied year-round. Two of the commercial connections are campground/RV parks consisting of 70 and 90 campsites respectively and 6 cabins. The third commercial connection is the golf course clubhouse which includes a restaurant. Based on an estimate of 3 persons per single family connection, 2 persons per multi-family connection, and 2 persons per campsite/cabins, the population during peak summer months is an estimated 1274 persons. The winter population is approximately 60 persons.

2


The MLW system is comprised of the following:

An intake located in Mabel Lake approximately 235 meters southeast of the Lakeshore Pump House (LPH), about 26 m deep. A 250 mm diameter intake pipe delivers water from the intake to a clear well beneath the LPH (water level elevation approximately 394m).

Water from the clear well is pumped into a 250 mm diameter transmission main that is

526m long. Chlorine is injected into the transmission main in the LPH to provide adequate

chlorine contact time (CT) within the transmission main before the first customer receives

water and to provide residual chlorine in the distribution main to inhibit microbial growth.

The mid-level reservoir located off Lusk Lake Road East, with a top water level (TWL) of

468m, is supplied from the LPH via the distribution network.

A booster station at Lusk Lake Road East pumps water to the upper level reservoir, with

a TWL of 518m, located off of Walker Road.

MLW does not provide fire protection services as there is no backup power and the

reservoirs are undersized according to the Fire Underwriters Survey. Also, there is

insufficient man power to staff a volunteer fire department during the off season.

The reservoirs provide water through gravity during power outages, and therefore

customers will not lose water supply by short term power outages. For long term outages

a portable generator would be mobilized to maintain system operation.

Online water quality instrumentation includes: turbidity and chlorine.

Treatment Requirements

All BC surface water systems are to meet the Drinking Water Treatment Objectives (Microbiological) for Surface Water Supplies (DWTO) in BC standards for the following:

4 log removal or inactivation for viruses

3 log removal or inactivation for protozoa (Giardia and Cryptosporidium)

2 treatment processes for surface water

1 Nephelometric turbidity units (NTU) maximum turbidity

0 Escherichia coli (E.coli) The treatment levels at MLW are not compliant with these standards as MWL does not provide sufficient treatment for 3 log inactivation for protozoa nor does the system have 2 treatment barriers. Currently MLW raw water is only chlorinated at the LPH. Chlorination of the water is completed to ensure sufficient CT to provide 4 log inactivation of viruses, to meet the 0 E.coli condition and to inhibit microbial growth in the distribution system by maintaining a minimum of 0.2 mg/L free chlorine throughout the system. At the maximum flow rate with two distribution pumps in operation

3


simultaneously, the CT achieved in the transmission main is 28 minutes; this meets the minimum CT requirement for viruses of 12 minutes during winter conditions (during the summer, only 6 minutes is required). See Appendix D for the CT calculation for MLW. After the intake was deepened to 26 meters in the spring of 2014 the 1 NTU maximum turbidity condition was met from 2014 until 2017. However due to unprecedented flowing in the spring of 2017 causing multiple landslides and extremely high erosion in the Mabel Lake watershed, a Boil Water Notice (BWN) was issued due to a turbidity event that was greater than 5 NTU (Table 14). For a more detailed analysis of this event please see the Incident section in this report. In order to meet the DWTO, MLW must either install filtration or if the raw water meets the filtration exclusion criteria, then UV treatment can be installed which is less expensive then filtration. The criteria for filtration exclusion are as follows:

Overall inactivation is met using a minimum of two disinfections, providing 4‐log reduction

of viruses and 3‐log reduction of Cryptosporidium and Giardia.

The number of E. coli in raw water does not exceed 20/100 mL (or if E. coli data are not available less than 100/100 mL of total coliform) in at least 90% of the weekly samples from the previous six months.

Average daily turbidity levels measured at equal intervals (at least every four hours) immediately prior to where the disinfectant is applied, are around 1 NTU but do not exceed 5 NTU for more than two days in a 12‐month period.

A watershed control program is maintained that minimizes the potential for fecal contamination in the source water.

A water sampling program was completed in 2016 and 2017 to assess if the raw water for MLW meets the criteria of a filtration exclusion. A more detailed discussion on meeting Provincial standards and on support for a filtration exclusion at MLW is provided in the Filtration Exclusion section of this report.

MAINTENANCE

Water Mains

Flushing Program

Annual water main flushing is undertaken by Teale’s Water Utility Service (Teale’s) of Vernon. Fire hydrant and standpipe maintenance was completed by Teale’s in 2016. Records of the hydrant maintenance are kept on file. There are two dead-ends on the water system, and standpipes located in these locations are flushed during the low flow season (September to May) to maintain chlorine residuals within the distribution system. These standpipes are located at:

1. Lot #8 Kingfisher 2. #21 Walker Road

4


SYSTEM CLASSIFICATION / OPERATOR CERTIFICATION

MLW is classified by the Environmental Operator Certification Program (EOCP) as a Water Treatment Facility Level II (WT-II) (EOCP #2270), and a Water Distribution Facility Level I (WD-I) (EOCP #1596). The MLW operations is contracted to Aberdeen Electric Ltd. with Warren McKim (EOCP Certification # 1336) as the chief operator, who 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 operator duties include checking the facilities at least three times per week during the summer, with no more than two days between checks; and two times per week during the winter. RDNO staff and the contract operator have access to water system information via the Supervisory Control and Data Acquisition (SCADA) system. All alarms are responded to by the operator by initially checking the SCADA system to judge whether the alarm needs immediate attention. If immediate attention is required, the operator will proceed to the site to respond. If required, the system operator will contact RDNO staff for guidance or assistance.

SOURCE ASSESSMENTS AND SOURCE RESPONSE PLANS

The water source for the MLW system is Mabel Lake. Based on the limnology characteristics, Mabel Lake is an oligotrophic lake (Bryan and Jensen, 1999). This means that as a whole Mabel Lake is clear, with low nutrient levels and low algae levels (Bryan and Jensen, 1999). At this time, the watershed area surrounding Mabel Lake is minimally developed. Due to the large contribution size of the watershed upstream of the community of Kingfisher and the small size of the water utility, aspects of source protection for this utility have been identified in the Shuswap River Watershed Sustainability Plan (SRWSP). The SRWSP was completed by the RDNO planning department and endorsed by the RDNO Board in 2014. It can be found at the following website: www.rdno.ca/index.php/services/planning-building/planning-projects/shuswap-river-watershed-sustainability-plan. The purpose of the SRWSP is to create a common long term vision for the management of the Shuswap River watershed, and a comprehensive plan for decision making with regard to land and water planning within the watershed. Another purpose is to develop a sense of responsibility for the watershed within the community. The SRWSP develops objectives for Land Use Planning/ Urban/Residential Development, Agricultural Management Practices, Forestry Management Practices, Industrial and Commercial Operations, Water Quantity, and outlines strategies pertaining to each. The goal for water quality and quantity is “to preserve and protect the Shuswap River Watershed to ensure water quality and quantity that supports the ecosystems and communities that rely on it”.

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

5


To further understand the source water for the MLW 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 goal of the water quality program at MLW is to monitor the quality of the raw water and treated water within the distribution system to detect the presence of microorganisms or other issues that can degrade water quality. As issues are found, operations staff can respond to correct any issues or appropriately notify customers as required. The following sections provide the following information:

microbial and chemical monitoring programs,

results of the 2017 sampling program,

CT monitoring of the system during normal operations, and

summary of water quality incidents that occurred in 2017.

2017 MLW Sampling Program and Schedules

Water quality monitoring for MLW is based on the requirements of the Drinking Water Protection Regulation (DWPR) Schedules A and B (Government of BC, 2003), the Guidelines for Canadian Drinking Water Quality (GCDWQ) (Health Canada, 2017), and the British Columbia Source Drinking Water Quality Guidelines (SDWQG) (MoE, 2017). The Water Quality Monitoring Program for MLW was reviewed in January 2017 and the updated sampling program and schedules are provided in Appendix C. RDNO provides an updated Water Quality Monitoring Plan to Interior Health (IH) at the beginning of each year after the program is developed. Table 1 provides the monitoring schedule for 2017, Tables 2 and Table 3 provide the parameters and frequencies of samples taken at different times of the year. To meet Schedule B for populations less 5,000 in the DWPR a minimum of four microbiological samples are required per month. In 2017, MLW met this requirement. This was accomplished by taking 2 samples on the second and fourth Tuesday of each month. In 2017, IH directed the RDNO to take two samples weekly in the distribution from mid-May to mid-September to increase the sampling frequency during the peak season with the highest population. The four sites were rotated each week to complete this request. During the remainder of the year, the schedule remains as mentioned above. During freshet (May and June) bacterial and Total Organic Carbon (TOC) samples are taken twice a month on the raw water. The remainder of the year the raw water is sampled monthly (Table 3) for these parameters with the exception of UV Transmissivity (UVT). UVT on the raw water is sampled based on the distribution sampling schedule (Table 2).

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

6


Table 1: Monitoring schedule for sample sites in 2017.

Sampling Site Name Sampling Point Type Sampling Frequency

Mabel Lake - Raw Source Monthly, twice per month during freshet

Old Pumphouse 1st Customer Monthly

Lot #12 Golf Course Midpoint in the distribution system Monthly

Lot #8 Kingfisher Endpoint in the distribution system Monthly

#21 Walker Road Endpoint in the distribution system Monthly

Table 2: Parameters and frequency sampled within the distribution in 2017.

Parameter Frequency of Analysis

Certified laboratory bacterial sample Twice per Month

pH Twice per Month

Temperature (oC) Twice per Month

Turbidity (NTU) Twice per Month

Free and Total Chlorine (mg/L) Twice per Month

Table 3: Parameters and frequency sampled for raw water in 2017.

Parameter Frequency of Analysis

Certified laboratory bacterial sample Monthly

pH Monthly

Temperature (oC) Monthly

Turbidity (NTU) Monthly

The system operators collect bacterial samples and drop them off with RDNO water quality staff to process for shipment to Caro Analytical Services (Caro). Caro sends results to IH and uploads results to WaterTrax, a third party online database the RDNO utilizes to store lab data. WaterTrax sends automatic alerts to the relevant RDNO staff for any results not in compliance with standards.

Source Water

Chemical, Physical Summary

Comprehensive sampling is completed annually. The annual sampling is rotated between June and November to ensure the source water meets water quality guidelines during different times of the year. The 2017 comprehensive sample was taken in July and the results are located in Table 4. All parameters were well within the GCDWQ limits.

7


Table 4: Raw water (untreated) comprehensive annual analysis at Mabel Lake in 2017.

Mabel Lake Raw Water Quality 2017

Facility: Mabel Lake Pump House

Sampling Point: Raw water line

Date of Sample: 7/11/2017

Canadian Drinking Water Guidelines

INORGANIC Results

(mg/L unless noted)

Maximum Acceptable Concentration (MAC)

Aesthetic Objective (AO)

Aluminum (total) 0.0371 no current guideline < 0.1

Antimony (total) <0.00010 < 0.006

Arsenic (total) <0.00050 <0.01

Barium (total) 0.01 <1

Boron (total) 0.0061 < 5

Cadmium (total) 0.000015 < 0.005

Calcium (total) 16.5 no current guideline no current guideline

Chloride 0.43 no current guideline <250

Chromium (total) <0.00050 < 0.05

Copper (total) 0.00212 no current guideline <1.0

Cyanide (total) <0.0020 <0.2

Fluoride <0.10 <1.5

Iron (total) 0.045 no current guideline <0.30

Lead (total) <0.00010 < 0.01

Magnesium (total) 2.31 no current guideline no current guideline

Manganese (total) 0.0019 no current guideline <0.05

Mercury (total) <0.000020 < 0.001

Molybdenum (total) 0.00071 no current guideline no current guideline

Nitrate (as N) 0.078 <10 mg/L as N

Nitrite (as N) <0.010 <1 mg/L as N

Potassium (total) 0.98 no current guideline no current guideline

Selenium (total) <0.00050 <0.01

Sodium (total) 1.5 no current guideline <200

Sulphate 7.2 no current guideline <500

Uranium (total) 0.000362 <0.02

Zinc (total) <0.0040 no current guideline <5.0

PHYSICAL Results

(mg/L unless noted)

Maximum Acceptable Concentration (MAC)

Aesthetic Objective (AO)

Alkalinity (Total, as CaCO3) 44 no current guideline

Colour 8.5 no current guideline <15 TCU

Conductivity 99.5 no current guideline no current guideline

Hardness (total, as CaCO3) 50.7 no current guideline see note

pH 7.7 no current guideline 6.5 - 8.5

Total dissolved solids / TDS 56 no current guideline <500

Turbidity 1.07 1 NTU <5 NTU

8


Note: The MLW source is considered “soft” water based on the GCDWQ aesthetic objective as hardness is below 60 mg/L. Hardness below 60 mg/L is considered soft, water between 200 mg/L and 500 mg/L is considered hard and above 500 mg/L is considered unacceptable for domestic purposes.

Turbidity

Turbidity measurements relate to the optical properties of water. Turbidity is caused by suspended matter such as clay, silt, finely divided organic and inorganic matter, soluble coloured organic compounds, plankton, and other microscopic organisms. Excessively high turbidity can have a negative effect on disinfection techniques. A provincial guidance document issued in April 2013, the Decision Tree for Responding to a Turbidity Event in Unfiltered Drinking Water assists RDNO during turbidity events and communication with the water customers. Turbidity at Mabel Lake intake is historically below one NTU with the exception of freshet. During freshet, if turbidity is > 1 NTU, the utility issues a Water Quality Advisory (WQA) or if the turbidity increases above 5 NTU a Boil Water Notice (BWN) is issued. In order to mitigate freshet turbidity events, the water intake at Mabel Lake was relocated to a greater depth of 26 m in spring 2014. The previous depth was 12 meters and the intake was located just above the lake bottom. The utility was able to avoid WQAs and BWNs during freshet from 2014 to 2016 after the intake improvement project. A pronounced turbidity spike occurred in 2017 (Figure 1) that corresponded to an unusually strong freshet event and for the first time in three years the water utility had to issue a BWN due to turbidity exceeding 5.0 NTU. The BWN was in effect from May 29 to June 2, 2017. The BWN was downgraded to a WQA on June 2 and this WQA was rescinded on June 26, 2017 (Table 14). In 2017, the online daily raw water turbidity data is only available from September to December 2017. SCADA data was not available from January to September 2017 due to a failure in the long term data archiving system at this utility. To avoid these losses of data in the future, a process to copy the data to the RDNO office server on a daily basis for backup was implemented. SCADA results were calculated from a daily average for September 8 to December 18, 2017. The average SCADA daily turbidity from September to December at the Mabel Lake intake was 0.23 NTU with a maximum of 0.56 NTU on September 9, 2017. Due to the missing SCADA data, the turbidity statistics for 2017 were calculated using the grab raw water samples. The average for the grab samples was 0.51 NTU with a maximum of 2.11 NTU on June 20, 2017 (Table 5). Freshet was extremely turbid in May and June 2017 coinciding with the unprecedented flooding events that occurred in the interior of BC. Table 5: Raw water turbidity results for Mabel Lake intake in 2017.

2017 Turbidity Statistics Mabel Lake - Raw Grab Samples

(NTU) Mabel Lake - Raw SCADA (NTU)

Min 0.09 0.09

Max 2.11 0.56

Average 0.51 0.23

95% Percentile 1.75 0.42

# Samples 30 124

Counts <1 NTU 27 124

Counts >1 NTU 3 0

Counts > 3.5 NTU 0 0

Counts > 5 NTU 0 0

9


Figure 1: SCADA and grab sample turbidity for Mabel Lake raw water.

UV Transmissivity

In anticipation of the installation of UV disinfection assuming a filtration exclusion application is successful, RDNO water quality staff monitors UV Transmissivity (UVT) throughout the year. UVT represents the percent of light transmitted through the water. Current UV treatment technologies are validated to be effective down to a minimum UVT measurement of 70% and hence UVT measurements provide an indication if UV is an acceptable treatment method for this source water. The UVT is monitored along with turbidity to determine if there is a correlation between turbidity and UVT (Figure 3). 2017 showed turbidity increasing during freshet which was followed by a decrease in UVT. UVT values decreased from the 90% range to mid-80% range and remained in the 80% range throughout the summer. It then increased to the 90% range as turbidity levels decreased in the fall and winter. Table 6 summarizes the raw water pH, temperature and UVT % filtered and unfiltered results for the raw water in 2017. In-house UV analysis for filtered and unfiltered samples was completed at least twice a month starting in May 2017 (Figure 2).

0

1

1

2

2

3

TU

RB

IDIT

Y (

NT

U)

M ABEL LAKE RAW WATER SCADA AND GRAB SAM PLE TURBIDITY FOR 2017

WQ Deviation (chlorine only) Mabel Lake Raw Water Grab Sample Turbidity

Mabel Lake Raw Water SCADA Turbidity

10


Table 6: Raw water field parameters and in-house UVT results for Mabel Lake intake in 2017.

Date pH Temperature (degrees C)

UVT - Filtered (%) UVT -

Unfiltered (%)

01/09/2017 8.2 6.0

02/07/2017 7.4 2.1

03/07/2017 8.2 6.9

04/04/2017 8.1 4.8

05/09/2017 5.2

05/16/2017 8.2 6.2 92.1 91.8

05/24/2017 89.9 89.1

05/29/2017 7.6 7.8

06/06/2017 7.8 7.4 87.8 85.3

06/20/2017 7.3 8.0 88.6 87.0

06/22/2017 7.5 8.4

06/26/2017 8.4 8.0

07/06/2017 87.1 86.0

07/11/2017 7.4 9.2 86.2 85.1

07/18/2017 7.2 9.6 85.9 85.1

07/25/2017 9.4 86.0 85.2

08/01/2017 7.4 8.0 87.6 86.5

08/08/2017 7.4 8.2 88.4 87.3

08/15/2017 7.2 8.3 87.0 86.4

08/22/2017 7.4 9.2 88.5 87.8

08/29/2017 7.2 9.6 87.6 86.9

09/05/2017 7.4 8.6 97.6 84.2

09/12/2017 7.4 8.6 91.6 90.1

09/19/2017 7.2 8.4 90.0 89.2

10/03/2017 8.2 9.4 89.3 89.0

10/17/2017 7.4 9.0 92.2 91.0

10/24/2017 91.8 91.8

11/07/2017 7.2 8.3 90.4 90.3

11/09/2017 7.1 9.4

11/21/2017 7.6 8.6 90.9 90.2

12/05/2017 7.4 8.2 91.0 90.7

12/19/2017 7.4 7.5 92.8 92.6

Min 7.1 2.1 85.9 84.2

Max 8.4 9.6 97.6 91.8

Average 7.6 7.9 89.6 88.2

Count 27 29 23 23

The UVT is measured using Standard Methods 10054 as a filtered and unfiltered sample (staff analyze unfiltered UVT in-house). The lowest values occur from June through September. The UVT in 2017 did not go below 84.2 %, with an average of 88.2 % noted for the year (Figure 2). This indicates that UV would be an effective disinfection method for this source. This trending will continue to be monitored in 2018.

11


Figure 2: UV Transmissivity both filtered and unfiltered on raw water.

82

84

86

88

90

92

94

96

98

100

12/30/2016 02/18/2017 04/09/2017 05/29/2017 07/18/2017 09/06/2017 10/26/2017 12/15/2017

UV

(%

)

Date

Mabel Lake Raw UV Filtered and Unfiltered in 2017

UV - Filtered (%) UV - Unfiltered (%)

12


Figure 3: UVT filtered and unfiltered compared to turbidity 2017.

Total Organic Carbon (TOC)

Total and Dissolved Organic Carbon (TOC and DOC respectively) are a measure of dissolved and suspended carbon bound in organic molecules and organisms. These are important parameters as they are precursors for disinfection by-products (this is discussed further in the Disinfection By-Products (DBP) section). It is also important as the MLW moves towards UV disinfection as TOC can interfere with the effectiveness of UV disinfection by reducing the UVT. TOC monitoring started in May (start of freshet) and continued monthly through the rest of the year in 2017. DOC is currently only monitored annually at the raw water. The Surface Drinking Water Quality Guideline (SDWQG) Maximum Acceptable Concentration (MAC) for TOC is 4.0 mg/L. Figure 4 provides the results of the TOC sampling. The TOC at the Mabel Lake intake averaged 2.0 mg/L in 2017. The highest level of TOC was observed on October 3 at 2.7 mg/L. Based on the sampling results, TOC is within the SDWQG MAC guideline.

0.00

0.50

1.00

1.50

2.00

2.50

82

84

86

88

90

92

94

96

98

100

12/30/2016 02/18/2017 04/09/2017 05/29/2017 07/18/2017 09/06/2017 10/26/2017 12/15/2017

Turb

idity

(NT

U)

UV

(%

)

Date

Mabel Lake Raw UV Filtered and Unfiltered vs Turbidity

13


Figure 4: Mabel Lake raw water total organic carbon (mg/L).

Bacteriological Summary

At least one monthly raw water sample is collected from the intake. The MLW system has a good microbial history as demonstrated in Table 7 which summarizes the source water bacterial results from Caro.

0.0

0.5

1.0

1.5

2.0

2.5

3.0

30-D

ec-1

6

29-J

an-1

7

28-F

eb-1

7

30-M

ar-

17

29-A

pr-

17

29-M

ay-1

7

28-J

un-1

7

28-J

ul-17

27-A

ug-1

7

26-S

ep-1

7

26-O

ct-

17

25-N

ov-1

7

25-D

ec-1

7

TO

C (

mg

/L)

Date

2017 Raw Water Total Organic Carbon

Total Organic Carbon / TOC(mg/L)

14


Table 7: Source water bacterial results for Mabel Lake intake in 2017.

Total Coliform CFU/100 mL

E.coli CFU/100 mL

Min <1 Min <1

Max 6 Max 1

Average <1 Average <1

Count 22 Count 22

E.coli is monitored as an indicator bacteria in the raw water to assess contaminant levels in the raw water and review changes in the source water. The criteria of a filtration exclusion also requires that E. coli in raw water does not exceed 20/100 mL in at least 90% of the weekly samples from the previous six months. In 2017, the E.coli results in the raw water met this objective with the highest recorded results being 1 CFU / 100 mL. These higher results occurred from June to August 2017 (Figure 5).

Figure 5: Raw water E. coli results for Mabel Lake, <1 E. coli are being shown on the graph as 0 E. coli.

Total Coliform is monitored as an indicator bacteria to assess changes in source water. The DWTO indicates that Total Coliform should not exceed 100 CFU / 100 mL in at least 90% of the weekly samples. In 2017, the Total Coliform numbers were highest from June to August (Figure 6). During this time, the highest recorded result was 6 CFU / 100 mL, which was also the highest recorded result for 2017. This is well within the DWTO criteria.

0

5

10

15

20

25

1-Ja

n-1

7

15-J

an-1

7

29-J

an-1

7

12-F

eb-1

7

26-F

eb-1

7

12-M

ar-1

7

26-M

ar-1

7

9-A

pr-

17

23-A

pr-

17

7-M

ay-1

7

21-M

ay-1

7

4-J

un

-17

18-J

un

-17

2-Ju

l-17

16-J

ul-

17

30-J

ul-

17

13-A

ug

-17

27-A

ug

-17

10-S

ep-1

7

24-S

ep-1

7

8-O

ct-1

7

22-O

ct-1

7

5-N

ov-

17

19-N

ov-

17

3-D

ec-1

7

17-D

ec-1

7

31-D

ec-1

7

E.

co

li (C

FU

/10

0 m

L)

Date

Mabel Lake Raw Water E. coli Counts in 2017

BC DW Treatment Objectives < 20 E.coli Escherichia coli / E. coli (counts)(CFU/100mL)

BC Drinking Water Treatment Objectives for Surface Water: E.coli in raw water does not exceed 20 / 100 mL in at least 90% of the weekly samples

15


Figure 6: Raw water Total Coliform results for Mabel Lake, <1 Total Coliform are shown on the graph as 0 Total

Coliform.

Treated Water

Chlorine Monitoring

MLW is sourced from surface water and some variability can occur within water quality parameters throughout the year. Under normal operations, the target residual after chlorine injection is normally between 1.50 to 2.00 mg/L to achieve the minimum target chlorine residual of 0.20 mg/L at the end of the distribution system. Continuous online chlorine monitoring is complete with an analyzer that monitors the free chlorine just past the injection point in the LPH (Table 8). In 2017, the online daily free chlorine data is only available from September to December 2017. SCADA data was not available from January to September 2017 due to a failure in the long term data archiving system at this utility. To avoid these losses of data in the future, a process to copy the data to the RDNO office server on a daily basis for backup was implemented. SCADA results were calculated from a daily average for September 8 to December 18, 2017. The average SCADA daily free chlorine from September to December at the Mabel Lake intake was 1.73 mg/L with a minimum of 1.59 mg/L in November and a maximum of 1.81 mg/L in September.

0

20

40

60

80

100

120

Tota

l C

olif

orm

s (

CF

U/1

00 m

L)

Date

Mabel Lake Raw Water Total Coliform Counts in 2017

BC DW Treatment Objectives < 100 Total Coliforms Total Coliforms (counts) (CFU/100mL)

BC Drinking Water Treatment Objectives for Surface Water: Total Coliforms in raw water does not exceed 100 / 100 mL in at least 90% of the weekly samples

16


There is a sample line delivering treated water to the chlorine analyzer approximately 5 m after the chlorine injection point off the transmission main. In the event of a low level chlorine alarm the system is programed through SCADA to shut off the lake pumps automatically to ensure that raw water is not pumped into the distribution system and to notify the operator via an alarm. Table 8: MLW monthly free chlorine data from SCADA.

Mabel Lake Treatment 2017

After Treatment Free Chlorine (mg/L)

Monthly Average SCADA

January

February

March

April

May

June

July

August

September 1.81

October 1.80 November 1.59

December 1.72

2017 Monthly Min 1.59 2017 Monthly Max 1.81 2017 Monthly Average 1.73

Total and free chlorine is also monitored with a hand held chlorine meter at four distribution sites whenever operators visit the site, which is a minimum of 3 times per week (Table 11). Operators record the residual readings and field parameters on an electronic operator log sheet which is backed up to the RDNO system by water quality staff monthly. Field parameters are also recorded on the submitted requisition sheets to Caro with bacterial samples and entered into WaterTrax. A chlorine injection site was installed in the Lusk Lake Road Booster Station to increase chlorine residuals during the winter in the Mabel Ridge Estates. After considerable effort to get it functioning properly it was deemed unreliable and shut down. The chlorine level at the LPH was increased to accommodate this shut down, and a small diameter PRV station was installed on Dolly Varden Road to act as a water quality loop to circulate water through the Mabel Ridge Estates and avoid dead ends and degraded water quality.

Water Distribution System

Bacteriological Summary

Schedule A of the DWPR requires the following criteria be met for potable water: 1. No detectable Escherichia coli (E.coli) per 100 ml.

In 2017, there was no detectable E.coli in the MLW distribution system (Table 10). MLW met this regulation.

2. At least 90% of samples have no detectable Total Coliform bacteria per 100 ml.

17


In 2017, 98.6% in the MLW distribution system had no detectable Total Coliform per 100 ml (Tables 9 and 10). MLW met this regulation.

a. The Old Pumphouse site had one sample with ≥2 Total Coliforms detected on June 22 but when re-sampled on June 26 it had <1 Total Coliform.

3. No sample has more than 10 Total Coliform per 100 ml.

In 2017, no samples had more than 10 Total Coliform (Table 9). MLW met this regulation. Samples taken in 2017 had one occurrence of Total Coliforms bacteria in the distribution system. The distribution bacterial results met the GCDWQ and DWPR (Tables 9 and 10).

Table 9: Mabel Lake distribution bacteriological summary of sample sites in 2017.

Mabel Lake Distribution Sample Sites

# Bacterial samples sent to Caro Analytical Laboratories

Results

#21 Walker Road 19 All samples <1 for E. coli and Total coliforms

Kingfisher 18 All samples <1 for E. coli and Total coliforms

Lot #12 Golf Course 20 All samples <1 for E. coli and Total coliforms

Old Pumphouse 17

All samples <1 for E. coli. One sample had ≥2 Total coliforms,

all other samples <1 Total Coliforms.

Total Samples 74 All samples <1 for E. coli and 98.6 % samples were <1 Total coliforms.

Table 10: Mabel Lake distribution bacteriological stats summary for the four distribution sites in 2017.

Total Coliform (CFU/100 mL)

E.coli (CFU/100 mL)

Min <1 <1

Max 2 <1

Average <1 <1

Count 74 74

Chemical Summary

Table 11 summarizes, by site, monitored field parameters (free chlorine, total chlorine, turbidity, pH, and temperature) that are taken throughout the distribution system for the year.

18


Table 11: Mabel Lake distribution field parameters with stats in 2017 calculated per site.

Sampling Point Free

Chlorine (mg/L)

Total Chlorine (mg/L)

Turbidity (NTU)

pH Temperature (degrees C)

#21 Walker Rd 0.50 0.60 0.48 8.3 11.8

Kingfisher 1.17 1.31 0.64 8.3 11.2

Lot #12 Golf Course 0.81 0.95 0.52 8.2 12.4

Old Pumphouse 1.29 1.42 0.56 8.3 10.1

Minimum 0.50 0.60 0.48 8.2 10.1

Maximum 1.29 1.42 0.64 8.3 12.4

Average 0.94 1.07 0.55 8.30 11.36

Count 507 508 508 74 80

Disinfection By-Products (DBP) in Distribution Water

Trihalomethanes (THMs) are a disinfection by-product formed when organic compounds naturally present in the source water react to being chlorinated. The level of THMs in treated water depends on numerous factors including: TOC, temperature, pH, water age, and chlorination dose. Ten distinct THM compounds are possible but only four occur to any significant degree in treated drinking water.

Chloroform;

Bromodichloromethane;

Dibromochloromethane; and

Bromoform.

Collectively the above THM compounds are referred to as total trihalomethanes (TTHMs). Further in this text TTHMs will refer to sample site averages of all four compounds, not the individual parameters. Figures 7 and 8 and Table 12 are reporting as an average of all four compounds therefore TTHMs.

The GCDWQ MAC for THMs is 0.1 mg/L and is based on a locational running annual average of a minimum of quarterly samples taken at the point in the distribution system with the highest potential THM levels. Figure 7 provides the TTHM results for 2017 which were well below the MAC with a TTHM’s average of 0.039 mg/L. The Kingfisher site is the longest retention time with the greatest potential THMs and the average longest retention TTHMs (Figure 8) are calculated from this site. The Old Pumphouse site is located shortly after treatment.

19


Figure 7: TTHM average for each sample date per site with the annual average of all sites shown as TTHM 1-2 in the

figure for both sites.

The Mabel Lake distribution has been monitored for THM’s since 2010, with consistently low TTHM results (Table 12 and Figure 8). This is likely due to the source water having little to no measurable color and low TOC levels throughout most of the year. Table 12 shows the TTHM average from 2010 to 2017 for the two sites that have been sampled in MLW (start and end of the system sites). The TTHM annual average for the longest retention at the end of the system site is also included in Table 12 for 2010 to 2017. All years’ show that TTHMs did not exceed guidelines. In 2018, THMs will only be sampled at the Kingfisher site but sampling will occur quarterly to comply with GCDWQ. Haloacetic acids (HAA) sampling will also be added to the Kingfisher site in 2018 with the same schedule as THMs.

0.000

0.020

0.040

0.060

0.080

0.100

0.120

March 2 September 5 TTHM 1-2

TH

Ms (

ug

/L)

Date

Mabel Lake TTHMs 2017

Kingfisher Old Pumphouse GCDW

20


Figure 8: Historical Mabel Lake distribution TTHM’s since monitoring began in 2010.

Table 12: Annual average TTHMs from 2010 to 2017.

Year Average ug/L Longest Retention ug/L

2010 48 53

2011 55 61

2012 73 84

2013 61 70

2014 48 54

2015 35 39

2016 39 40

2017 39 39

WATER USAGE

Table 13 provides the monthly consumption for MLW while Figure 9 provides a graph of the monthly consumption from 2013 to 2017 with the exception of 2015 when the water meter was not working correctly and the values recorded could not be used. Water consumption begins to significantly increase in May with peak consumption usually observed in July and August, while October shows a decrease in consumption. Figure 9 demonstrations that monthly consumption has significantly increased in 2017 compared to previous years. This increase in consumption is concerning to the utility and will be investigated in 2018 starting with leak detection to determine if there is a leak contributing to this change.

0

20

40

60

80

100

120

2010 2011 2012 2013 2014 2015 2016 2017

TT

HM

(u

g/L

)

Date

Mabel Lake Distribution TTHM's 2010 - 2017

Average ug/L GCDWQ IMAC Average Longest Retention ug/L

21


June and July consumption data was lost, hence those monthly consumption values were estimated. In order to avoid losing data again, a system was implemented where RDNO staff download the consumption data monthly and back it up on the RDNO server.

Table 13: Monthly consumption data for MLW.

Mabel Lake Treatment 2017

Consumption

Monthly Average Total Monthly

Consumption (m3)

January 4574

February 4157

March 4693

April 5613

May 7027

June 17997

July 17997

August 24790

September 13377

October 5979

November 6288

December 7532

2017 Monthly Min 4157

2017 Monthly Max 24790

2017 Monthly Average 10002

2017 Total 120024

22


Figure 9: Mabel Lake water usage for 2013 to 2017 with the exception of 2015 when the flow meter was not working

properly.

EMERGENCY RESPONSE / NOTIFICATION

A comprehensive update of the MLW Emergency Response Plan (ERP) was completed in 2012 and a review is completed annually. Sampling methodology and RDNO small utility ERP training for the operators also occurs annually. 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. MLW Emergency Response Plan 2. MLW 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. MLW must inform customers when their drinking water does not meet standards with the appropriate notifications based on risk. A WQA is released when the water poses a modest health risk. A BWN is released when there is a known or higher risk of a possible health impact to the customer.

0

5000

10000

15000

20000

25000

30000

Jan

uary

Fe

bru

ary

Ma

rch

Ap

ril

Ma

y

Jun

e

July

Au

gu

st

Se

pte

mb

er

Octo

be

r

Nove

mbe

r

Dece

mbe

r

Wate

r U

se (

m3)

Date

Mabel Lake Annual Water Use from 2013 to 2017

2013 2014 2016 2017

23


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 has developed a new method to provide notification to its customers about announcements, media releases and updates. Customers are advised to subscribe to the Mabel Lake Water Mailing List by going to www.rdno.ca and clicking on “Subscribe for Updates” (Figure 10) and subscribe for Mabel Lake Water email updates (Figure 11).

Figure 10: RDNO notification to subscribe for MLW updates.

Figure 11: RDNO mailing updates for MLW announcements.

http://www.rdno.ca/

24


INCIDENTS

In 2017, four incidents occurred in the MLW utility (Table 14), one of which required a Media Release to customers. Reporting of incidents are required by RDNO or operations staff when there is a deviation from normal operating procedure or a water quality issue. Incident reporting allows staff to track and review issues to assess if improvements could reduce the risks from each issue.

MLW experienced a BWN which was issued May 29 due to the raw water source turbidity increasing to greater than 5 NTU. This BWN was downgraded to a WQA on June 2. This advisory remained in effect until June 26 when it was rescinded. The spike in turbidity occurred concurrent to the 2017 flooding and was likely caused from creek/river bank instabilities, reported landslides into Mabel Lake and other erosion issues as a result of the high peak flows. Table 84: 2017 incident summary for MLW.

MLW: 2017 Public Notifications # Connections

effected

Turbidity at Source May 29 –June 26

Mabel Lake turbidity greater than 5 NTU. Advised to go to BWN.

310

Temporary Water Interruption

October 13 Water main work caused water interruptions. Notification was hand delivered to affected customers.

MLW: 2017 Incidents # Connections

effected

Power Outage May 24 Power outage shut down system and reservoir drained to 50%. No customers without water.

0

Power Outage July 24

Power outage shut down system and reservoir drained to 11%. No customers without water. Water quality sampling was completed to ensure no concern. All parameters were within guidelines.

0

Power Outage August 5 Power inconsistent causing breaker for lakeshore pumps to trip. Requires site visit by operator to reset to start pumps again.

0

In 2017, there were no water quality complaints.

CROSS CONNECTION CONTROL PROGRAM

The RDNO has a Cross Connection Control Program (CCCP) for all water utilities owned by RDNO, including the MLW. The CCCP program is focused on identifying high and medium backflow risks and ensuring annual compliance of Backflow Prevention Device (BPD) testing for these facilities. Currently the majority of connections in the Kingfisher community are residential with the exception of a few businesses, including 2 campgrounds, a restaurant and store.

25


LONG TERM IMPROVEMENTS

The current disinfection process at MLW is with chlorine only. As outlined in the UV Transmissivity and Filtration Exclusion sections UV treatment is the proposed second barrier. With this existing water system, a 3 log inactivation of Giardia and Cryptosporidium is not possible with chlorination alone. In order to meet provincial standards, UV treatment has been proposed within the Mabel Lake Water Treatment Study completed by Kerr Wood Leidal on May 13, 2011. A copy of the report is available at: www.rdno.ca/index.php/services/engineering/water/community-water-utilities/mabel-lake-water-utility (MLW will be seeking a Filtration Deferral. More information is provided in the 2018 Work Plan section below).

WORKS COMPLETED IN 2017 AND PREVIOUS YEARS

Works completed on the MLW system in 2017 include:

Removal of the Old Pressure Reducing Valve (PRV) - This PRV was removed at the Mabel Lake Holiday Centre (MLHC) campground as it was no longer needed and considered a safety issue. Installation of several main line gate valves were completed as part of this project.

Pipe Main Commissioning - The 150mm diameter water main on Large Road was commissioned. The water main had originally been installed in 2003 to service cabins for the MLHC, but had not been put into service. MLHC was upgrading their service connection for the cabins and commissioning the main to accommodate this connection was required. A new service connection was also installed to reduce future renewal costs.

Relocation of the Old Pumphouse Sample Site - The Old Pumphouse is private property so the sample site was relocated to inside the LPH so the access to this sample site would be on RDNO property. The Old Pumphouse had been considered the first customer but the service was relocated with the pipe main commissioning project and no longer represented the first customer. A sample site is planned to be installed in 2018 to represent the first customer.

Electrical upgrades to the LPH - Hardware was installed at the LPH along with software to monitor the quality of power supplied by BC Hydro. Several power “brownouts” had caused pumps to shut down, throwing a breaker, and requiring the Operator to drive to the site to reset the breaker. The new equipment shuts off the pumps in a controlled manner when power supply is poor, without throwing the breaker. When power returns to normal the pumps can start up automatically without requiring the operator to visit the site, thus saving on operations costs and reducing the risk of a water shortage for customers.

SCADA Programming - SCADA programming was completed to shut off the distribution pumps at the LPH when the chlorine residual at the injection point falls below a set value which is currently 0.5 mg/L. This will greatly reduce the risk of raw water entering the distribution system if there is a chlorine system failure.


Chlorine System Improvements - The 90 degree bend with a single chlorine injection point was replaced by a tee with two injection points. The two injection points allows two


http://www.rdno.ca/index.php/services/engineering/water/community-water-utilities/mabel-lake-water-utility

http://www.rdno.ca/index.php/services/engineering/water/community-water-utilities/mabel-lake-water-utility

26


chlorine pumps to be connected, with one on standby. If the operating chlorine pump fails, the standby pump can be turned on remotely by SCADA improving the reliability of the system and reducing operations costs.

Installation of Two Chlorine Analysers – One analyser was installed to monitor the chlorine at the Booster Pump Station and the other to be installed at the Upper Level reservoir to monitor chlorine residuals. An upgrade was completed on the SCADA software to align with this project.


Valve and Isolation Improvements - An in-line valve and a small PRV station were installed on Dolly Varden Road just south of Walker Road to allow changes to the water flow in the Mabel Lake Estates area. These changes separate the upper and lower pressure zones so that 3 dead ends were eliminated, improving water circulation and water quality.

Standpipe installation - A standpipe was installed on the 250mm diameter transmission main at the entrance to the MLHC campground. This was installed so the transmission main could be flushed.

2018 WORK PLAN

Works planned for 2018 include:

Installing New Sample Stations: o At the end of the transmission main before the first customer. This is the new “first

customer” sample station to replace the Old Pumphouse sample site.

o At the small PRV on Dolly Varden Road. This replaces the sample site from a hosebib on the house at 21 Walker Road.

Installing PRV controls in the Booster pump station on Lusk Lake Road East – This will cause the valve to open when the Mid-Level reservoir is low, allowing water from the Upper Level reservoir to flow into the lower pressure zone if/when it’s needed.

Clean Reservoirs and Improving Circulation – Both the mid-level and upper reservoirs are scheduled to be cleaned and a circulation system will be installed in the upper-level reservoir to improve water circulation and reduce the risk of “dead-zones” that cause water degradation and increase the formation of disinfection by-products (THMs). The intent is to improve water quality in the Mabel Ridge Estates area.

LONG TERM TREATMENT IMPROVEMENTS

There has been a significant water quality improvement observed after the lake intake was deepened. RDNO plans to apply for filtration exclusion for MLW in 2019. The following provides a summary of the progress on the IH filtration exclusion criteria that need to be met to fulfil the filtration exclusion criteria:

Mabel Lake Water Utility 2017 Annual Report Mabel Lake Water Utility 2017 Annual Report

27


RDNO has completed a monthly sampling program for protozoa to assess background concentrations of Cryptosporidium and Giardia in the water source to demonstrate if the raw water fully meets the filtration deferral requirements for protozoa. These monthly samples were completed for one year from November 2014 to October 2015.

Once the protozoa risk is assessed, the conceptual design for a second barrier for the MLW system and cost estimate will be undertaken. For example, if the protozoan risk meets the exclusion criteria, plans to install UV will be undertaken. If the risk does not meet the criteria then plans for filtration will be required. UV treatment has been proposed within the Mabel Lake Water Treatment Study completed by Kerr Wood Leidal on May 13, 2011 and noted the following:

If protozoan sampling indicates that UV is required, then conceptual planning for future UV will be implemented at that stage. This plan may also include a conceptual plan for filtration in the event that this treatment method is required in the future.

If protozoan sampling indicates that filtration is required, then planning for implementation of filtration will be initiated.

Once the treatment requirement is determined, a project installation schedule and Financial Implementation Plan (FIS) will be developed and will be presented to the RDNO Board for endorsement and submitted to Interior Heath for approval.

Based on the FIS, Development Cost Charges (DCC) will be calculated and a DCC Bylaw presented to the RDNO Board for approval to assist in collecting funds for this project.

CONCLUSION

The program objectives for MLW owned and operated by the RDNO are:

Provide Clean, Safe drinking water

Reliable delivery

In Quantities to meet current and future demand

Continuity of service

“Water Quality Advisories”– only a rare event RDNO has made significant strides in fulfilling the RDNO program objects, the requirements outlined by IH, and in implementing BC’s DWPA and DWPR at MLW. RDNO will strive for implementation of system improvements within the constraints of the MLW budget and through the seeking of grant funding. MLW is pleased to present the 2017 Annual 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 Regional District of North Okanagan at 250-550-3700 or email [email protected].


mailto:[email protected]

28


REFERENCES

British Columbia Ministry of Environment. 2017. B.C. Source Drinking Water Quality Guidelines. Accessed on-line at: www2.gov.bc.ca/assets/gov/environment/air-land-water/water/waterquality/wqgs-wqos/approved-wqgs/source_drinking_water_quality_guidelines_bcenv.pdf British Columbia Ministry of Health. 2013. Decision Tree for Responding to Turbidity Event in Unfiltered Drinking Water, Accessed online from: www2.gov.bc.ca/assets/gov/environment/air-land-water/water/waterquality/how-drinking-water-is-protected-in-bc/1078529_dwog_part_b_-_9_turbidity_decision_tree.pdf British Columbia Ministry of Health. 2012. Drinking Water Treatment Objectives (Microbiological) for Surface Water in British Columbia. Version 1.1 Accessed online from: www2.gov.bc.ca/assets/gov/environment/air-land-water/water/waterquality/how-drinking-water-is-protected-in-bc/part_b_-_5_surface_water_treatment_objectives.pdf Bryan, J. E. and Jensen, E. V. 1999. Water Quality Trends in Mara, Mabel, and Sugar Lakes 1971-1998. Prepared for Ministry of Environment, Lands and Parks. Government of British Columbia. 2003. Drinking Water Protection Regulation. Accessed on-line at: www.bclaws.ca/civix/document/id/crbc/crbc/200_2003 Government of Canada. 2011. Statistics Canada Environmental Indicators – Residential Water Use. Accessed on-line at: www.canada.ca/en/environment-climate-change/services/environmental-indicators/residential-water-use.html Health Canada (2017). Guidelines for Canadian Drinking Water Quality—Summary Table. Water and Air Quality Bureau, Healthy Environments and Consumer Safety Branch, Health Canada, Ottawa, Ontario. Accessed on-line at: www.canada.ca/content/dam/hc-sc/migration/hc-sc/ewh-semt/alt_formats/pdf/pubs/water-eau/sum_guide-res_recom/sum_guide-res_recom-eng.pdf

https://www2.gov.bc.ca/assets/gov/environment/air-land-water/water/waterquality/how-drinking-water-is-protected-in-bc/1078529_dwog_part_b_-_9_turbidity_decision_tree.pdf

https://www2.gov.bc.ca/assets/gov/environment/air-land-water/water/waterquality/how-drinking-water-is-protected-in-bc/1078529_dwog_part_b_-_9_turbidity_decision_tree.pdf

https://www2.gov.bc.ca/assets/gov/environment/air-land-water/water/waterquality/how-drinking-water-is-protected-in-bc/part_b_-_5_surface_water_treatment_objectives.pdf

https://www2.gov.bc.ca/assets/gov/environment/air-land-water/water/waterquality/how-drinking-water-is-protected-in-bc/part_b_-_5_surface_water_treatment_objectives.pdf

http://www.bclaws.ca/civix/document/id/crbc/crbc/200_2003

http://www.canada.ca/en/environment-climate-change/services/environmental-indicators/residential-water-use.html

http://www.canada.ca/en/environment-climate-change/services/environmental-indicators/residential-water-use.html

http://www.canada.ca/content/dam/hc-sc/migration/hc-sc/ewh-semt/alt_formats/pdf/pubs/water-eau/sum_guide-res_recom/sum_guide-res_recom-eng.pdf

http://www.canada.ca/content/dam/hc-sc/migration/hc-sc/ewh-semt/alt_formats/pdf/pubs/water-eau/sum_guide-res_recom/sum_guide-res_recom-eng.pdf


APPENDIX A

MLW WATER SYSTEM MAP

250Ø

PVC

LAK

E INT

AKE

(1992

)

01

02

03

100

Ø P

VC10

0Ø

PVC

100Ø P

VC

100Ø P

VC

100

Ø P

VC

100

Ø P

VC

100 Ø P VC

75Ø

PV

C

100 Ø P VC150 Ø P VC

75Ø PV C

75Ø PV C

75Ø PV

C

150 Ø P VC

100

Ø P

VC

150 Ø P VC

150 Ø P VC 100

Ø P

VC15

0Ø

PVC

100Ø P

VC

150

Ø W

AT

150 Ø WA T

100 Ø WA T

150 Ø WA T

200 Ø P VC

200Ø P

VC

200

Ø P

VC15

0Ø

PVC

200 Ø P VC

BLO

W O

FF

SP

150 Ø P VC

SP

SPSP

SPSP

200 Ø P VC

SP

SP

SP

SP

SPSP

SP

SPSP

SP

150 Ø P VC

SPSP

200 Ø P VC

SP

150Ø P

VC

150Ø P

VC

SP

SP

150 Ø P VC 150

Ø P

VC

150

Ø P

VC15

0Ø

PVC

200 Ø P VC

200

Ø P

VC

250 Ø P VC

200 Ø P VC

200 Ø P VC

200

Ø

200 Ø P VC 200 Ø P VC

100Ø P

VC150

Ø

200

Ø P

VC&

150Ø

OV

ERF

LOW

200 Ø P VC

& 15 0Ø O V E RF LO W

250

Ø P

VC

250 Ø P VC

FLO

W M

ETE

R

PR V

150 Ø P VC

100Ø P

VC

100Ø P

VC10

0Ø

PVC

100Ø P

VC

SP

SP

150 Ø WA T

150

Ø P

VC

SP

SP

SP

SP

SP

SP

150

Ø P

VC

150Ø P

VC

150 Ø P VC

150 Ø P VC

150 Ø P VC

50Ø IR R I G AT IO N

50Ø D OM ES TI C

468 R

eser

voir (

1 ce

ll)Vo

l; ±32

0 m3

HWL;

469.

20m

Feed

; Main

PS

(Larg

e Rd.)

Boos

ted

at Lu

sk L

ake

Rd. P

S

518 R

eser

voir (

2 ce

ll)Vo

l; ±UK

N m

3HW

L; 51

8.0m

Feed

; Lu

sk L

ake R

d. PS

SP

SP

SP

150

Ø W

AT

150

Ø W

AT

Beatt

ie Rd

Walke

r Rd

Dolly

Vard

en R

d

Lusk Lake Rd

Rivermouth Rd

Leighton Rd

Kingfi

sher

Rd

unna

med l

ane

Mabel Lake WaterThis map was compiled by RDNO, using data believedto be accurate; however, a margin of error is inherent in all maps. This product is distributed without warranties of any kind, eitherexpress or implied, including but not limited to warrant ies of sustainability or particular purpose or use.

Plot Date: Jun 10, 2013 1:12,000Scale: 0 500 1,000250Meters

Mabel Lake Water Service Area

#

c (Mid Level Reservoir)

#

d (Upper Level Reservoir)

# d (Booster Station)

#

b (Transmission Main)

# a (Intake) # a/b (Clear Well)

jdepfyffer

Polygonal Line


APPENDIX B

MLW SAMPLE SITES MAP

01

02

03

100Ø

PVC

100Ø

PVC

100Ø P

VC

100Ø

PVC

100Ø

PVC

100Ø

PVC

100Ø PVC

75Ø

PVC

100Ø PVC150Ø PVC

75Ø PVC

75Ø PVC

75Ø PV

C

150Ø PVC

100Ø

PVC

150Ø PVC

150Ø PVC 100Ø

PVC

150Ø

PVC

100Ø

PVC150Ø

WAT

150Ø WAT100Ø WAT

150Ø WAT

200Ø PVC

200Ø

PVC

200Ø

PVC

150Ø

PVC

200Ø PVC

BLOW

OFF

SP

150Ø PVC

SP

SPSP

SPSP

200Ø PVC

SP

SP

SP

SP

SPSP

SP

SPSP

SP

150Ø PVC

SPSP

200Ø PVC

SP150Ø P

VC

150Ø PVC

SP

SP

150Ø PVC

150Ø P

VC

150Ø

PVC

150Ø P

VC

200Ø PVC

200Ø

PVC

250Ø PVC

200Ø PVC

200Ø PVC

200Ø

200Ø PVC 200Ø PVC

100Ø P

VC150

Ø

200Ø

PVC

& 15

0Ø O

VERF

LOW

200Ø PVC

& 150Ø

OVERFLO

W

250Ø

PVC

250Ø PVC

FLOW

MET

ER

150Ø PVC

100Ø

PVC

100Ø

PVC

100Ø

PVC

100Ø

PVC

SP

SP

150Ø WAT150Ø

PVC

SP

SP

SP

SP

SP

SP

150Ø

PVC

150Ø

PVC

150Ø PVC

150Ø PVC

150Ø PVC

50Ø IRRIGATION

50Ø DOMESTIC

468 R

eserv

oir (1

cell)

Vol; ±

320 m

3HW

L; 46

9.20m

Feed

; Main

PS

(Large

Rd.)

Boos

ted at

Lusk

Lake

Rd.

PS

518 R

eserv

oir (2

cell)

Vol; ±

UKN

m3HW

L; 51

8.0m

Feed

; Lu

sk La

ke R

d. PS

SP

SP

SP

150Ø

WAT

150Ø

WAT

250Ø PVC LAKE INTAKE

B2066

1

1P5194

P.2790

10

8

P.18111

1

1

A

A186

01

CG9012/1161

KD975

18A1

8601

P. 33

257

35084

AIRST

RIP

TAXI-WAY

1

B2066

1

KAS1617

KAP45947

2P. 5441

KAP57802

P.12210

3

1

2

A

A186

01

CG9012/1161

A1860

1

ROAD

KAP54711

35084

AIRST

RIP

12

2.659ha

8

1

P. 17880

W25 CHAINS OF SE1/4SEC. 14

A18049

B

34531

DOLL

Y

REM

56105

4

P. 2790

P. 2790

5

4

3

1 3

A186

01

A1860

1

VARD

EN

2

2

B

AIRST

RIP

P. 5245 4

27 28

A B C

COMMON54713

PLAN

222

30

PL.LAKEMABEL

P.1277

0

P10680

13

14

16

1718

19

35

1215

10

876 5

4

3

2

116

33

40

8

421

23

26

30

29

23

26 28

2524

19

27

20

17 14 13

11718

12P L A N 2 0 1 5 25

2

4

1

PLAN

332

57

29PLAN B7593

PCL. AKH76856

P.279

0B4

766

7

241655

11 12 2221

19

12

25KAP62694

18KAP 62694

1 2 7

KAP 6269410

6

FRAC.

33 A B C D

3

REM SW1/4

1

4

5

6

KAP7

0626

KAP7

0808

1KAP70797

P.279

0

A

B

CD

KAP71571

PHAS

E 1

KAP72766

KAP72768

KAP72769

AKAP72765

KAP72767

KAP72770

KAP72842

SW 1/4

A

KM086618SEWERAGE

KAP73021

KAP73022KAP73023

COMMONPROPERTYPHASE 2

PROPERTY

COMMON PROPERTY

COMM

ONPR

OPER

TY

COMM

ONPR

OPER

TY

COMM

ONPR

OPER

TY

KAP7

2109

KAP73110

KAP73111

KAP73112

KAP73113

KAP73297

KAP7

3671

KAP73671

KAP73671

KAP7

3671

KAP75219

SKOOKUMCHUCK RAPIDS PARK

12

KAP81268

KAP82554

0237952

1

2

3

4

KAP90444

3401118

91696

KAP81665

34091423406490

3412512

KAP69463

3405756ParcelA

A B

COMMONPHASE 2

AKAP72765

0242859

PLAN

125

47

PHASE 2

1P.21255

41975

2223

0

24

AB C

74

F30292 0 2 4

P L A N

PLAN 2024 7

Bldg.4 (SL 49-60)

Bldg.1 (SL 1-12)

KAS3033Bldg.2 (SL 13-27)

Bldg.3 (SL 28-48)

WALK

ER RO

AD

CESSNA RD.

LUSK LAKE RD

ROHAN - P

ETER

S

PCL. B

KAP20152

SIMARD RD.

LARGE RD

LEIGHTON RDZEMLA RD.Licence file

Licence file

RIVERMOUTH ROAD

LAKE

VIEW

PL.

ENDERBY

MABEL

LAKE ROAD

BEAT

TIE RD

Licence file

Licence file

Licence file

Licence file

1KAP73539

Licence file3405818

LuskCreek

1KAP2656

171615

13

1112

10

46

46

444342

2324

2627

2829

3031

32

3839

41

22

36

34

COMM

ON

PROP

ERTY

1

2

34

5678910111213

14

151617

19 20 21

18 222324 25

EPP6

3160

PARKWAY RD

PARKSIDE PL

EPP63159

EPP63159

KM086618

SEWERAGE

KAP60070 COV

PH.3

KAP 62694

KAP62695

KAP62695

347410File#3409864

9

7978

808182

86

899091

9293

9495

969798

99

102

87

83

85

8788

106105

104103

101100

1011121314151617181920212223242526272829303132

1 23456

33343536373839404142 43

44454647

48

5756

55545352

585960616263646566

6768

6970717273747576

77

5049 51

18

PH. 2KAS2501PH. 2

KAS2501PH. 1

20

LuskLake

KAP47996

KAP4

8054

KAP47282 COV

KAP60069

KAP62962

KAP50932

KAP58523

KAP56407

KAP56421

KAP53617

KAP6

5899

KAP6

6097

KAP67586

KAP67682

KAP58106

KAP75209

KAP76903

KAP92118 KAP78438

EPP52539

KAP5

0446

KAP5

1983

EPP66109

KAP90443KAP93003

PLAN 33257

KAP57803Not constructed LUSK LK RD E

KAS2261

Not m

aintai

ned

A11369

KAP76295 KINGF

ISHER

RD

12.291 ha

11.01 ha

8.58ha

1KAP24188

12.355 ha

KAP11248

KAP7

0625

KAP52451 2

KAP6652

23

22.788ha

KAP26561 2 3 4 5 6 7

89101112

1314

15 1617

30

1920 2122 23

242526272829

18

313233343536

636261

373839

4041

4243

4445

4647

6059

5857

5655

5453

646566

6768

697048

4950

51 52

1KAP6252

3.302 ha

ENDERBY MABEL LAKE ROAD

2

#0

#0

#0

#0#0

Mabel Lake Sampling StationsThis map was compiled by RDNO, using data believedto be accurate; however, a margin of error is inherent in all maps. This product is distributed without warranties of any kind, eitherexpress or implied, including but not limited to warranties of sustainability or particular purpose or use.

Plot Date: Aug 23, 2018 1:7,000Scale: 0 500 1,000250Meters

Plot Size: 17" x 11"

Kingfisher

Lot 12 Golf Course

Lake Station Pumphouse - RawOld Pumphouse

#21 Walker Rd


APPENDIX C

2017 MLW SAMPLING PROGRAM and SCHEDULES

Mabel Lake

Sampling Schedule: Mabel LakeRevision Date: January 8, 2016

Completed by: KP

Sampling *

Chlorine

Temperature

Bacterial, UVT, & TOC **

Chain of Custody ***

Bottle Drop off

Turbidity Meter Cleaning

WaterTrax ID#1374C1375519F772E351276DC

Notes:

Lot # 12 Golf Course

Old Pumphouse#21 Walker Road

Sampling will occur the second and fourth week of every month (exception: May, October, and December due to RDNO staff completing sampling Christmas)

At all distribution sites use handheld meter and log data, do weekly

At all distribution sites take 1 - Caro BacterialUntreated site for raw water in pumphouse - Caro Bacterial, TOC, & 500 ml UVT (Filtered and Unfiltered)

Mabel Lake - Raw

At all distribution sites use handheld meter and log data, do weekly

Fill out highlighted area's on Chain of Custody for TOC and UVT, fill out highlighted areas on requisition sheets for bacterial samples.Samples must be dropped off at Enderby Community Health Centre on Wednesdays by 12 pm. Microbiological samples must be at Caro lab within 24 hours or they cannot be processed. Ice packs in coolers keep samples at 4 °C, samples cannot be frozen.

Mabel Lake Sample Sites

* Sampling was changed to twice a month in 2015 due to IHA request. Sample sites rotate between Lot #12, #21 Walker and Raw on the second week of the month and Old PH and Lot #8 Kingfisher on the fourth week of the month (Exception May, October, and December due to RDNO sampling and Christmas).

** UVT Filtered and Unfiltered and TOC will be taken on raw water once a month (twice a month during freshet) from January and June to gather data for filtration exclusion.

*** IHA supplied RDNO with requisition sheets for bacterial samples for all sample sites in 2015. Therefore all bacterial samples use a requisition sheet for bacterial samles and UVT and TOC still use RDNO COC.

Sites

Lot # 8 Kingfisher

Operator Tasks

Flush, clean, and calibrate online turbidity meter quarterly (March, June, September and December) and write when flushed, cleaned, calibrated and any other comments in online excel sheet operator's log.

Interior Health Unit Information

Enderby Community Health Centre, 707 - 3rd Avenue Enderby, BC 250-838-2450 Water Sample drop off: Wednesday by 12 noon

MABEL LAKE

Sampling Schedule: Mabel LakeRevision Date: December 10, 2015

Completed by: KP

Bi-annually RDNO Water Quality SamplingDistribution & Untreated (Caro bacterial) Late May and Early OctoberTHMs Late May and Early OctoberSource Water (Annual) Late May or Early October

GVW Sampling (Caro Bacterial & THM's) May and Octobersite WaterTrax ID# BottlesMabel Lake - Raw 1374C Caro, TOC, 500 ml for UVT - F & UF (Jan-June 2015)King Fisher 13CD6 Caro (THMs)Old Pumphouse 19F77 Caro (THMs)#21 Walker Road 2E351 Caro#12 Golf Course 276DC Caro

Yearly (May or October)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 a

Annual Sampling Records2012 October2013 May2014 October2015 May2016 October

Mabel Lake - Raw1374C

Week Wednesday Sampling Sites Sample Bottles

Jan 2 - 6

Jan 9 - 13 Lot #12, #21 Walker, & RawRaw Sample Bacterial bottle (regular bottle))Distribution Samples are bacterial bottles (regular bottle)

Jan 16-20

Jan 23 - 27 Old PH & Lot #3 KingfisherDistribution Samples are bacterial bottles (regular bottle)

Jan 30 - Feb 3

Feb 6 - 10Lot #12, #21 Walker, & Raw (Sampled

by WQ)

Raw SampleBacterial bottle (regular bottle))Distribution Samples are bacterial bottles (regular bottle)

Feb 13 - 17

Feb 20 - 24 Old PH & Lot #3 KingfisherDistribution Samples are bacterial bottles (regular bottle)

Feb 27 - Mar 3

Mar 6 - 10 Lot #12, #21 Walker, & RawRaw Sample Bacterial bottle (regular bottle))Distribution Samples are bacterial bottles (regular bottle)

Mar 13 - 17 Turbidity Meter Flush, Clean, and Calibrate

Mar 20 - 24 Old PH & Lot #3 KingfisherDistribution Samples are bacterial bottles (regular bottle)

Mar 27 - 31

Apr 3 - 7 Lot #12, #21 Walker, & RawRaw Sample Bacterial bottle (regular bottle))Distribution Samples are bacterial bottles (regular bottle)

April 10 - 14

Apr 17 - 21 Old PH & Lot #3 KingfisherDistribution Samples are bacterial bottles (regular bottle)

Apr 24 - 28

May 1 - 5 Lot #12, #21 Walker, & RawRaw Sample Bacterial bottle (regular bottle))Distribution Samples are bacterial bottles (regular bottle),

May 8 -12

May 15 - 19 Old PH & Lot #3 Kingfisher, & Raw

Raw Sample (TOC bottle (brown glass), UVT Filtered and Unfiltered bottle (in-house bottle))Distribution Samples are bacterial bottles (regular bottle), THM bottles on Old PH and Kingfisher)

May 22 - 26

MLW Operator Sample Schedule 2017 (revised 170511 by KP)



May 29 - Jun 2

Jun 5- 9 Lot #12, #21 Walker, & Raw

Raw Sample (TOC bottle (brown glass), UVT Filtered and Unfiltered bottle (in-house bottle),Bacterial bottle (regular bottle))Distribution Samples are bacterial bottles (regular bottle)

Jun 12 - 16 Turbidity Meter Flush, Clean, and Calibrate

Jun 19 - 23 Old PH & Lot #3 Kingfisher, & Raw

Raw Sample (TOC bottle (brown glass), UVT Filtered and Unfiltered bottle (in-house bottle), Bacterial bottle (regular bottle))Distribution Samples are bacterial bottles (regular bottle)

Jun 26 - 30

July 3 -7 Lot #12, #21 Walker, & Raw


July 10 - 14

July 17 - 21 Old PH & Lot #3 Kingfisher

Raw Sample UVT Filtered and Unfiltered bottle (in-house bottle))Distribution Samples are bacterial bottles (regular bottle)

July 24 - 28

July 31 - Aug 4 Lot #12, #21 Walker, & Raw


Aug 7 - 11

Aug 14 - 18 Old PH & Lot #3 Kingfisher


Aug 21 - 25

Aug 28 - Sept 1



Sep 4 - 8 Lot #12, #21 Walker, & Raw


Sep 11 - 15 Turbidity Meter Flush, Clean, and Calibrate

Sep 18 - 22 Old PH & Lot #3 Kingfisher


Sept 25 - 29

Oct 2 - 6 Lot #12, #21 Walker, & Raw


Oct 9 - 13

Oct 16 - 20 Old PH & Lot #3 Kingfisher

Raw Sample UVT Filtered and Unfiltered bottle (in-house bottle))Distribution Samples are bacterial bottles (regular bottle), THM bottles on Old PH and Kingfisher)

Oct 23 - 27

Oct 30 - Nov 3

Nov 6 - 10 Lot #12, #21 Walker, & Raw


Nov 13 - 17

Nov 20 -24 Old PH & Lot #3 Kingfisher


Nov 27 - Dec 1

Dec 4 - 8 Lot #12, #21 Walker, & Raw


Dec 11 - 15 Turbidity Meter Flush, Clean, and Calibrate



Dec 18 -22 Old PH & Lot #3 Kingfisher


Dec 25 - 29

May and October Keiko completes monitoring well sampling for septic field170511 - Operator will take two distribution samples the first and third week of the month alternating between the four distribution sites.170511 - Raw water sample will be taken twice a month. On the first week TOC, UVT Filtered and Unfiltered, and Bacterial will be sampled. The third week only an in-house UVT sample will be taken and brought to RDNO lab.150511 - Raw water sample will be taken twice a month during freshet (usually May and June) on the first and second week of the month.170511 - All bacterial samples use a requisition sheet to send to the lab. The brown bottles use the MLW COC sheet. The UVT samples will be processed in-house by RDNO staff.


APPENDIX D

MLW CL2 CONTACT TIME

Completed by: ZMUpdate (JdeP): June 17, 2013 Date Printed: 9/6/2018, 8:33 AM

Mabel Lake Water Contact Time Calculation

0.25 m ID = inside diameter of transmission main Contact Pipe

526 m L = Contact Pipe Length

26 m3

V = Contact Pipe Total Volume

480 USgpm maximum flow rate peak operating conditions, with 2 distribution pumps and 1 fire pump running, Usgpm

30 L/s Q = maximum flow rate peak operating conditions, with 2 distribution pumps and 1 fire pump running, L/s

14 minutes V/Q = Theoretical Detention Time (TDT)

15 L/s maximum flow rate under normal conditions, 2 distribution pumps running

28 minutes Contact Time in Pipe under normal conditions, 2 distribution pumps running

The Lakeshore Pump House operates normally with either 2 distribution pumps or 1 fire pump running, but under peak flow conditions all

3 pumps operate (see Note 3)

Contact Time in Pipe for Peak Flow assumes all 3 pumps are running continuously

Contact Time in Pipe for Normal Flow assumes duplex flow, where 2 distribution pumps are running continuously

CT calculation for 1st customer - Cl2 sampling point at water sample station at Lot 42 at airpark taxiway

Cl2 Residual

mg/L (free)

(note 1)

Cl2

Injection

mg/L

pH raw

water

Raw

Water

temp °C

(note 2)

CTa =

(Cl2 * CT in

Pipe)

CTr (Virus)

(note 4)

CTa/CTr

(Virus)

CT (Virus)

% Achieved

Existing Intake Location Minimum Minimum Average Average min-mg/L Required

Peak Flow, Avg. Temp 1.17 2.50 7.71 9.0 16.6 8.0 2.08 100Peak Flow, Winter Temp 1.17 2.50 7.71 4.0 16.6 12.0 1.39 100Peak Flow, Summer Temp 1.17 2.50 7.71 12.0 16.6 6.0 2.77 100

Normal Flow, Avg. Temp 1.17 2.50 7.71 9.0 33.3 8.0 4.16 100Normal Flow, Winter Temp 1.17 2.50 7.71 4.0 33.3 12.0 2.77 100Normal Flow, Summer Temp 1.17 2.50 7.71 12.0 33.3 6.0 5.54 100

Proposed Intake Location

Normal Flow, Avg. Temp 1.17 1.50 7.50 7.4 33.3 8.0 4.16 100Normal Flow, Winter Temp 1.17 1.50 7.50 4.0 33.3 12.0 2.77 100Normal Flow, Summer Temp 1.17 1.50 7.50 10.7 33.3 6.0 5.54 100

Notes:

1. Normal residual Cl2 range at 1st customer is 1.17 to 1.62 mg/L, minimum is 1.17 mg/L.

2. Temperature average is about 9°C with lows of near 3°C in Winter months, and highs near 17°C in Summer.

3. Peak Flow Rates occur normally in Summer when water temperatures are warmest.

4. From CT Values Table B-2 of US EPA Guidance Manual LT1ESWTR Disinfection Profiling and Benchmarking

virus log inactivation = 4*(Cta/CTr) log

virus percent achieved =100-(100/(10^(4*CTa/CTr))) log(x)=4*CTa/CTr x=10^(4*CTa/CTr) xvirus = 2.06E+08


APPENDIX E

MLW UV SCHEMATIC

Documents

Mabel Lake Water Utility 2017 Annual Report · Mabel Lake Water Utility 2017 Annual Report The MLW system is comprised of the following: An intake located in Mabel Lake approximately