Monitoring Water Quality in the Distribution System
Transcript of Monitoring Water Quality in the Distribution System
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National Guide to Sustainable Municipal Infrastructure
Monitoring Water Quality in the Distribution System
Clean and Safe Drinking Water Workshop
Gander, Newfoundland Sept. 21-23, 2004
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Presentation Agenda
Who am I?
What is InfraGuide?
How are best practices developed?
Best practice for monitoring water quality in the distribution system
• Development team and information sources
• How to develop a program
• Key considerations
• On-line monitoring
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Who Am I?
Jo-anne Moore, P.Eng.
Project Engineer
Water Division
Delcan Corporation
(613) 738-4160
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Who Am I – Really?
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What is InfraGuide?
• National Guide to Sustainable Municipal Infrastructure
• National network of people
• Published best practice documents
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What is InfraGuide?
Key infrastructure areas
Potable Water
Storm and Wastewater
Roads and Sidewalks
Environmental Protocols
Transit
Decision Making and Investment Planning
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How are Best Practices Developed?
Partners: FCM, NRC, Infrastructure Canada
Currently over 300 active volunteers
• municipalities
• trade organizations
• consulting engineers
• contractors
• suppliers
• politicians
• academics
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How are Best Practices Developed?
• Set topics/priorities
• Committee proposal
• Select consultant (facilitator)
• Set up working group (experts)
• Document development
• Review: technical committee, stakeholder and peers
• Publish
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Published Best Practices
• Available on-linewww.infraguide.ca
• Hard copies1-866-330-3350 (order form available on-line)
• Regional contact: Atlantic Provinces - CBCL LimitedNfld. – Jack Caines 709-364-8623
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What is InfraGuide?
Key infrastructure areas
Potable Water
Storm and Wastewater
Roads and Sidewalks
Environmental Protocols
Transit
Decision Making and Investment Planning
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Potable Water
• Examine municipal or water utility delivery of drinking water to the public
• Suggest ways to ensure public health and safety at least risk and best value
• Up-to-date technical approaches and practices
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Potable Water - Published
1. Deterioration and Inspection of Water Distribution Systems
2. Water Use and Loss in the Water Distribution System
3. Selection of Technologies for the Rehabilitation or Replacement of a Water Distribution System
4. Water Quality in Distribution Systems
5. Establishing a Metering Plan to Account for Water Use and Loss
6. Developing a Water Distribution System Renewal Plan
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Potable Water - Review
1. Speed and Quality of Linear System Repairs
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Potable Water - Development
1. Monitoring Water Quality in the Distribution System
2. Small System Operation and Maintenance Practices
3. Methodologies for Setting a Cross-Connection Control Program
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Monitoring Water Quality in the Distribution System
• Development team and information sources
• How to develop a program
• Key considerations
• On-line monitoring
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• Working group 12 members
• Consultant facilitator
• InfraGuide technical advisor
• Stakeholder and peer reviewers
Development Team
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Information Sources
• Guidance Manual for Monitoring Distribution System Water Quality(AwwaRF)
• Online Monitoring for Drinking Water Utilities (AwwaRF/CRS Proaqua)
• Survey of 11 Canadian municipalities
• Expertise of working group members
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How to Develop a Program
• Understand the importance of a Distribution System monitoring program
• Understand your system
• Satisfy regulatory monitoring requirements
• Develop a site-specific program
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Key Considerations
1. Determine monitoring parameters
2. Determine monitoring locations
3. Determine monitoring frequency
4. Determine sampling techniques
5. Manage and report monitoring data
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Key Considerations
6. Include event-driven monitoring
7. Establish partnerships
8. Develop response procedures
9. Include community monitoring of indicator parameters
10.Maintain and update the monitoring program
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1. Monitoring Parameters
• Regulatory requirements
• Public health: chlorine residual, E.coli, disinfection by-products
• Heterotrophic plate count (HPC)
• Many others: turbidity, flow, pressure, ammonia, nitrite, nitrate, temperature, pH, alkalinity, metals, taste, odour, hydrocarbons, etc.
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1. Monitoring Parameters
• Treatment process, chemical additions
• Multiple sources
• Distribution system attributes
• Special consumer needs
• Community health concerns
• Historical data
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2. Monitoring Locations
• Regulatory requirements
• Historical data
• Sensitive facilities
• Distribution system attributes
• Spatial representation, population/consumer distribution, high flows, system ends
• Operational requirements
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3. Monitoring Frequency
• Routine and non-routine
• Regulatory requirements
• Oversampling
• Frequent chlorine – on-line?
• Parameter – time to affect water quality
• Form a history of water quality
• Identify problems – quickly, easily
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4. Sampling Techniques
• On-line monitors
• Manual sampling
• Automatic samplers
• Regulatory requirements/frequency
• Remote locations
• Costs – capital and operating
• O&M of equipment
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4. Sampling Techniques
• Availability of technology, labs
• Sample storage, preservation, travel
• Sample contamination
• Staff/equipment availability, capability
• Fastest possible receipt of results
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5. Data Management
• Data storage and access issues
• Automatic screening and flags:1. Results approach unacceptable2. Results reach unacceptable
• Computerized system with backup
• Daily review – charts, graphs
• Link to GIS for analysis
• Reporting
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6. Event-driven Monitoring
• Procedures for expected events
• Compare with routine results
• Consumer inquiries
• Suspected health problem from drinking water – involve health and province
• Water main break
• Water main flushing and cleaning
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6. Event-driven Monitoring
• Fire fighting
• Construction activities
• Operational activities
• Large changes in water usage –seasonal population, plant shutdown
• Floods and other extreme weather
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7. Partnerships
• Stakeholders, public, private groups
• Exchange information on problems
• Educate those impacting system
• Establish partnerships now, meet regularly, communication protocols
• Contribute to training programs
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7. Partnerships
• Health and fire departments
• Dept. of Environment and Conserv.
• Regulatory agencies/approvals
• Emergency measures/response
• Building/plumbing inspection
• Labs, pharmacies, wholesale
• Consultants, contractors, suppliers
• Industry and special interest groups
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8. Response Procedures
• Determine normal/acceptable limits
• Develop response procedures:1. Results approach unacceptable2. Results reach unacceptable
• Corrective actions: flushing, chemical dosage, valve operation, shutdown facilities, public notices, re-sampling
• Communication protocols, reporting
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9. Community Monitoring
• Health-related community parameters
• Acute, seasonal, chronic conditions
• Over-the-counter medicine, hospital and clinic attendance, disease
• Compare local conditions
• Municipality and health department
• Pharmacies
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10. Update and Maintain
• Staff training and updates
• Instrument replacement, calibration
• Document and communicate –summary tables and mapping
• Criteria for change: growth, new construction
• Annual review
• Communicate strengths/weaknesses
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On-line Monitoring
• Chlorine, pressure, flow – pumping stations, storage facilities, others
• Technological development
• Combination of on-line monitors and manual sampling
• Evaluate before purchase and installation
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On-line Monitoring
• Timely information
• Consumer confidence
• 24/7
• Regulatory standards
• Cost/benefit analysis – capital costs, operating costs, cost savings, water quality, operations, compliance
• Treatment facility first
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On-line Monitoring
• Determine locations: manual sampling, historical data
• Communication system: recording, transfer, retrieval, backup, alarms
• Regular maintenance, reagents, staff training, regular calibration
• Power, drain, operational and weather issues
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Questions?
• InfraGuide
• Monitoring Water Quality in the Distribution System
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