Backflow Prevention and Cross Connection Control at NCGW ...
Transcript of Backflow Prevention and Cross Connection Control at NCGW ...
![Page 1: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/1.jpg)
Cathy Heald NCGW System Inspection Coordinator
November 22, 2016
Backflow Prevention and Cross Connection Control at
NCGW Systems
![Page 2: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/2.jpg)
Overview
• Sanitary Surveys at NCGW Suppliers of Water
• How BPCCC is Evaluated
• Discovered Cross Connections
![Page 3: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/3.jpg)
Sanitary Surveys at NCGW Suppliers of Water
![Page 4: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/4.jpg)
Public Suppliers of Water Currently 1980 public water systems in Colorado 874 Community 168 Non-transient non-community 938 Transient non-community
Total 1106 Non-community systems
![Page 5: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/5.jpg)
Transient –vs- Non-transient Transient, non-community water system means a non-community water system
that does not regularly serve at least twenty-five of the same persons over six months per year.
![Page 6: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/6.jpg)
Transient –vs- Non-transient Non-transient, non-community water system means a public water
that regularly serves a population of at least 25 of the same people for at least six months per year and is not a community water system. months per year.
![Page 7: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/7.jpg)
• System Management & Operations – 1 of 8 sanitary survey element
• Required of all public suppliers of water
• Evaluated during both the recordkeeping and physical walkthrough
portions of a sanitary survey
Backflow Prevention and Cross-Connection Control
![Page 8: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/8.jpg)
How BPCCC is Evaluated during Sanitary Surveys
![Page 9: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/9.jpg)
• Written backflow prevention and cross-connection control program reviewed by the inspector
• Survey of the water system to identify cross connections
• includes the internal water supply buildings which the
water system owns and/or operates
Evaluation of Backflow Prevention and Cross-Connection Control
![Page 10: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/10.jpg)
• Installation of backflow prevention assemblies or methods
on uncontrolled cross connections • Inspector checks for inventory or summary of existing
backflow prevention assemblies/methods
• Testing and inspection requirements for backflow prevention assemblies/methods
• Annual backflow prevention and cross connection control program report
Evaluation of Backflow Prevention and Cross-Connection Control
![Page 11: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/11.jpg)
• Physical walk-through of the entire water works including the treatment plant, storage tanks if present and the DS
• To evaluate areas where potential cross connections may exist
• To evaluate existing backflow prevention assemblies/methods
that are documented in the program
Evaluation of Backflow Prevention and Cross-Connection Control
![Page 12: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/12.jpg)
NCGW Suppliers typically have small Distribution Systems
Well TP DS
One to two buildings with service connections is not uncommon
![Page 13: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/13.jpg)
NCGW Suppliers with fairly large Distribution Systems
However some can have small community like DS
![Page 14: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/14.jpg)
Multiple Service Connections
![Page 15: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/15.jpg)
• Irrigation systems
• Fire sprinkler systems
• Chemical dispensers
• Beverage dispensers (carbon dioxide gas)
Targeted Areas during Sanitary Surveys
![Page 16: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/16.jpg)
• Boilers (use of chemical or not)
• Heat exchangers (toxic transfer fluid)
• Coffee machines/non-carbonated beverage dispensers
• Areas that use chemicals such as school chemistry labs
Targeted Areas during Sanitary Surveys
![Page 17: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/17.jpg)
Discovered Cross Connections
![Page 18: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/18.jpg)
Irrigation System
Main water line splits into two lines that flow onto the DS
Direct Connect to Potable Water System in TP
![Page 19: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/19.jpg)
Irrigation System
Direct Connect to Potable Water System in DS
![Page 20: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/20.jpg)
Four Hose Manifold Irrigation Hydrant
![Page 21: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/21.jpg)
Recreational Splash Pad
![Page 22: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/22.jpg)
Recreational Splash Pad
Splash Pad Valve Control Box
Splash pad’s overflow collection pond with fountain
![Page 23: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/23.jpg)
Fire Suppression System
No Backflow Prevention Assembly
![Page 24: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/24.jpg)
• The National Fire Protection Association Code 13 (2002 Edition), Section 8.16.4.6.2 requires that a hydraulic analysis be performed as a part of the backflow prevention assembly installation to ensure that the fire suppression system not be compromised.
• Hydraulic Analysis includes:
• revised hydraulic calculations,
• necessary system modifications to accommodate the additional friction loss, and
• new fire flow data.
Cross Connection Control at Existing Fire Suppression Systems
![Page 25: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/25.jpg)
• Must be performed by a certified Fire Suppression System Contractor
• The CO Division of Fire Prevention and Control’s website maintains a list of certified fire suppression contractors at: https://www.colorado.gov/pacific/dfpc/fire-suppression-system-contractors
Hydraulic Analysis at Existing Fire Suppression Systems
![Page 26: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/26.jpg)
Fire Suppression Tank Water Supply Line
![Page 27: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/27.jpg)
Concentrated Chemical Dispensers
Pure Force dispensers directly connected to the potable water supply
Sanitizing floor cleaner and multi-purpose degreaser
![Page 28: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/28.jpg)
EcoLab Chemical Dispenser
Atmospheric Vacuum Breaker on Mop Sink Faucet mospheric Vacuum Breaker
![Page 29: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/29.jpg)
Concentrated Chemical Dispensing Hose
EcoLab dispenser hose submerged into receiving sink full of dirty dish water
![Page 30: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/30.jpg)
Janitorial Mop Sinks
![Page 31: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/31.jpg)
Boiler System
No backflow prevention device could be located
![Page 32: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/32.jpg)
Boiler Intermediate Atmospheric Vent
Identified after the sanitary survey
![Page 33: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/33.jpg)
Swimming Pool Fill Lines
2” below water level
![Page 34: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/34.jpg)
RV Waste Digesters
High Hazard!
![Page 35: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/35.jpg)
Plastic Vacuum Breaker
Advertised as fully backflow prevented
![Page 36: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/36.jpg)
Reclaim Water Digester Tank
Finished water directly enters the digester
![Page 37: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/37.jpg)
Reverse osmosis waste line
Water softener waste line
Evaporative cooler drain line (not connected to the drinking water system)
Both are cross connections
Not a cross connection
![Page 38: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/38.jpg)
Anti-freeze Water Pump
Discharge Hose
![Page 39: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/39.jpg)
Artesian Well Overflow Line
![Page 40: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/40.jpg)
Barn Animal Water Troughs
![Page 41: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/41.jpg)
Water Softener Discharge Line
![Page 42: Backflow Prevention and Cross Connection Control at NCGW ...](https://reader030.fdocuments.net/reader030/viewer/2022020707/61febf1a2f06eb2c3d4cf7a8/html5/thumbnails/42.jpg)
Questions & Comments?