HomeMy WebLinkAboutSSP071811CITY OF CENTRAL POINT
Study Session Agenda
July 18, 2011
I. MEETING CALLED TO ORDER – 6:00 P.M.
II. DISCUSSION ITEMS
A. Central Point Hazard Mitigation Plan (Holtey)
B. Cross Connection and Backflow Prevention (Samitore)
III. ADJOURNMENT
Central Point
City Hall
541-664-3321
City Council
Mayor
Hank Williams
Ward I
Bruce Dingler
Ward II
Kelly Geiger
Ward III
Ellie George
Ward IV
Allen Broderick
At Large
Carol Fischer
Kay Harrison
Administration
Phil Messina, City
Manager
Chris Clayton, Assistant
City Manager
Deanna Casey, City
Recorder
Community
Development
Department
Tom Humphrey, Director
Finance Department
Bev Adams, Director
Human Resources
Barb Robson, Director
Parks and Public Works
Department
Matt Samitore, Director
Jennifer Boardman,
Manager
Police Department
Jon Zeliff, Chief
Purpose: Protect drinking water supply from contamination by
systems with a potential hazard, such as:
◦Irrigation systems
◦Industrial facilities
◦Commercial facilities
Program requirements:
◦Back-flow device installation
◦Device testing by owner every year
◦Results provided to Public Works
Enforcement conducted to bring hazardous facilities into
compliance
Residential dangers to City’s water system
Water may pool in yards where the sprinkler heads are nested and if not
protected against backflow the contaminated water may be sucked back into the City’s water system.
Contamination occurs as a result of:
◦Backflow into City Supply from:
Back-pressure –occurs when pressure in a facility is higher than the City’s water system causing water and contaminates to flow back into the City’s water system.
Back-siphonage –occurs when a drop in the City’s water system causes the water to flow in the opposite direction.
◦Cross-connection occurs when a pipe, vessel, or machine containing non-potable fluid, solids, or gas connects to the water system and contaminates the water supply by back-flow.
Lawn irrigation systems, swimming pools and hot tubs are common cross-connection sources.
Industrial, Commercial buildings pose the most significant hazards to water systems.
Most common type of cross-connection
A backflow preventer is a check valve that prevents water from flowing backwards into a
water supply line resulting in a contaminated water supply. It prevents your potable water system from getting contaminated.
There are degrees of protection ranging from a vacuum breaker on a garden hose line to
reduced pressure zone backflow preventers used in an industrial setting where chemicals
are connected to water lines. The most common backflow used is the double check valve assembly backflow used in underground sprinkler system.
The type of backflow to use and where it’s installed depends on the application and the
threat level.
Because the Assemblies have springs and flaps that open and shut several hundred times a
day it must be tested annually to make sure it continues to operate properly.
OAR 333961-070 & CP Ordinance 13.20.060
Typical Double Check Valve Backflow Prevention
Assembly
To house or
sprinkler system
To meter and
water main
Flow direction
Typical fire suppression and fire vault units with
backflow preventers
Commercial Backflow units
Conger Morris
Albertsons
Ericson Air Crane
It’s the Law. Statewide mandates exist across the country which require every
municipality to operate and maintain an effective backflow program. OAR 333-061-
0065 Public water systems shall be operated and maintained in a manner that
assures continuous production and delivery of potable water….
Contamination can be very costly . The cost to clean and repair the damage
from a cross connection contamination can be very expensive.
Providing clean safe water to the residences. It is essential to have and keep
the publics trust that the water they drink is safe and clean.
Backflow Program began in 1980
The program is still is growing, but only about 40% of all backflows get tested annually.
◦1995 there were less than 100 known tested units
◦2001 there were 735
◦2005 there were 1625
◦2010 there were 1936
Currently there are approximately 5,300 backflows in the City (commercial and residential).
Public Works aims to increase the annual testing to 80% or better by the end of 2012,
◦This is achieved by using better software and GIS mapping to track facilities and compliance
Options
◦A. Ordinance Revision for city to test if in non-
compliance.
◦Additional Fee like the MWC