WELCOME! Your instructors today: Neil Worthen John Hamner This - - PDF document

▶
welcome
SMART_READER_LITE
LIVE PREVIEW

WELCOME! Your instructors today: Neil Worthen John Hamner This - - PDF document

Apr 23, 2023 209 likes •686 views

Cross-Connection Controls Santa Rosa January 2016 This document was prepared using funds under Agreement 15-017-550 with the California State Water Resources Control Board; the total Agreement is for $3,971,379 and will produce multiple

slide-1
SLIDE 1

1

Santa Rosa January 2016

Cross-Connection Controls

This document was prepared using funds under Agreement 15-017-550 with the California State Water Resources Control Board; the total Agreement is for $3,971,379 and will produce multiple documents

WELCOME!

Your instructors today:

Neil Worthen John Hamner

This training is presented by RCAC with funding provided by the CA State Water Resources Control Board Division of Drinking Water (DDW)

slide-2
SLIDE 2

2

Housekeeping

  • Cell phones = set to STUN
  • Participation = encouraged
  • Restrooms
  • Breaks
  • Lunch
  • Evaluations
  • Certificates for CEU’s

The Rural Community Assistance Partnership

4

RCAC

slide-3
SLIDE 3

3

RCAC Programs

  • Affordable housing
  • Community facilities
  • Water and wastewater infrastructure financing (Loan

Fund)

  • Classroom and online training
  • On-site technical assistance
  • Median Household Income (MHI) surveys

 Acquiring and maintaining technical, managerial and financial capabilities (TMF) to consistently provide safe drinking water  TMF assessment process Mandatory – New systems Mandatory – Change of ownership Mandatory - To obtain SRF funding Optional – Enforcement action (DPH or LPA)

What is Capacity Development?

slide-4
SLIDE 4

4

The 13 TMF Elements

TECHNICAL ELEMENTS

  • Consolidation Feasibility
  • System Description
  • Certified Operators
  • Source Capacity
  • Operations Plan
  • Training

The 13 TMF Elements

MANAGERIAL ELEMENTS

  • Ownership
  • Water Rights
  • Organization
  • Emergency Response Plan (ERP)
  • Policies
slide-5
SLIDE 5

5

The 13 TMF Elements

FINANCIAL ELEMENTS

  • Budget/Capital Improvement Plan
  • Budget Controls

Where To Find Answers…

 George Faggella, Drinking Water Capacity Development Coordinator

916/449-5652 George.Faggella@waterboards.ca.gov

  • Division of Drinking Water District offices
  • Your Local Primacy Agency (LPA)
  • SWRCB Drinking Water Program web site:

http://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/TMF.shtml

slide-6
SLIDE 6

6

http://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/TMF.shtml

Scroll Down

12

LINKS TO RESOURCES

slide-7
SLIDE 7

7

Performance Assessment Rating Tool (PART)

  • 4 to 6 weeks from today
  • Email w/ today’s workshop in subject line
  • 3 questions – 3 minutes maximum
  • How did you use the information that was

presented today?

  • Funders are looking for positive changes
  • Help us continue these free workshops!

Questions / Discussion

slide-8
SLIDE 8

8

Time For An Opener!

slide-9
SLIDE 9

9

What is a Cross Connection?

  • Any physical connection to

a public water supply through which a contaminant (non-potable liquid, solid or gas) could enter the system by backflow

slide-10
SLIDE 10

10

19

Typical Cross-Connections…

Water softener drain line patched into a building sewer

20

Typical Cross-Connections…

Ice machine drain line patched into a sink drain

slide-11
SLIDE 11

11

21

Typical Cross-Connections…

Improperly plumbed toilet rinse line

22

Beauty parlor hair rinse sink

Typical Cross-Connections…

slide-12
SLIDE 12

12

23

Hospital bed pan washing station (yep, you heard it right!)

Typical Cross-Connections…

24

Garden hose connected to swimming pool recirculation line

Typical Cross-Connections…

slide-13
SLIDE 13

13

25

Hoses connected to janitor sinks for mop pails

Typical Cross-Connections…

26

Rinse lines and drain lines from an embalming table at a funeral home!

Typical Cross-Connections…

slide-14
SLIDE 14

14

Any Problem Here? Motorized Carbonator

slide-15
SLIDE 15

15

SoapDispenser

Cross-Connections

slide-16
SLIDE 16

16

slide-17
SLIDE 17

17

What is a Cross Connection?

  • Contaminants can enter the potable water

system in either of two ways:

  • Backsiphonage
  • Backpressure

Backsiphonage

  • When pressure is lost in distribution system a

siphon condition can occur

  • Broken water line
  • High hydrant flows
  • High water demand
slide-18
SLIDE 18

18

Backsiphonage Backpressure

  • Conditions that produce higher pressure than

that in the public water system

  • Storage tanks at higher elevation
  • Auxiliary pumping facilities
slide-19
SLIDE 19

19

Back Pressure Example

100 PSI 70 PSI Back Pressure Private Well

Plumbing Cross Connections

  • Actual or potential connections between a

potable and non-potable water supply

  • Serious public health hazard
  • Have resulted in contamination of drinking

water and spread of disease

slide-20
SLIDE 20

20

Why You Need A Cross Connection Control (CCC) Program

  • Protect the health of your consumers!
  • Microbiological contaminants that cause

cholera, typhoid, giardiasis or cryptosporidiosis

  • Chemical contaminants that cause effects based
  • n type, amount and duration of exposure
  • Physical hazards (compressed air, gas, hot water

and steam) cause injuries or death

Backflow Prevention

  • Backflow can be prevented
  • Air Gap
  • Mechanical device or assembly
  • Selection is based on
  • Application and design
  • Degree of hazard
  • Approval requirements
slide-21
SLIDE 21

21

Air Gap Mechanical Devices

  • Residential Meter Check / Single-Check Valve

(CV)

  • Dual-Check Backflow Preventer (DCV)
  • Dual-Check with Atmospheric Vent (DCAV)
  • Hose Bibb Vacuum Breaker (HBVB)
  • Atmospheric Vacuum Breaker (AVB)
slide-22
SLIDE 22

22

HBVB DCV

Simple Devices

AVB

slide-23
SLIDE 23

23

Mechanical Assemblies

  • Pressure Vacuum Breaker Assembly (PVBA)
  • Double-Check Valve Assembly (DCVA)
  • Double-Check Detector Assembly (DCDA)
  • Reduced-Pressure Backflow Assembly (RPBA)
  • Reduced-Pressure Detector Assembly (RPDA)

PVBA

slide-24
SLIDE 24

24

DCVA

RPBA or RPZ

slide-25
SLIDE 25

25

DCDA

  • Similar to DCVA and RPBA, but includes bypass with

meter

Questions / Discussion

slide-26
SLIDE 26

26

What Are Your “High Risk” Customers? Exercise....

General Installation Guide

  • Common Backflow Prevention Devices

Approved Backflow Preventer Type Degree of Health Hazard Backflow Conditions High Low Backsiphonage Backpressure AG Yes Yes Yes Yes RPBA/RPDA Yes Yes Yes Yes DCVA/DCDA No Yes Yes Yes

USC Foundation for Cross Connection Control and Hydraulic Research – List of Approved Assemblies http://www.usc.edu/dept/fccchr/

slide-27
SLIDE 27

27

Cross-Connection Programs

  • All public water systems should have cross-

connection control programs

  • Do not rely on federal, state or local statutes
  • Enforcement usually accomplished via
  • rdinances, resolutions etc.

CCC Programs

  • Step 1: Establishment of legal authority and program

policies

  • Adopt a Cross Connection Control ordinance
  • Step 2: Evaluate service connections for cross-

connection hazards

  • Survey existing customers
  • Establish new connection policy
  • Establish schedule for reassessment
slide-28
SLIDE 28

28

  • 3. Elimination And/Or Control Of Cross

Connections

  • Develop and implement procedures to ensure

that:

  • Cross connections are eliminated whenever

possible

  • Cross connections are controlled by installation
  • f approved devices commensurate with the

degree of hazard

  • Approved devices are tested annually
slide-29
SLIDE 29

29

Determine Type of Program

  • Premise isolation
  • Fixture isolation
  • Combination of both

Purveyor Owned Assembly

UPC Fixture Protection

slide-30
SLIDE 30

30

Customer Owned Assembly

UPC Fixture Protection

CCC Program – Content (cont)

  • 4. Provision of qualified personnel
  • Evaluate time and training requirements
  • 5. Inspection and testing of backflow

preventers

  • Written procedures for inspection and testing
  • 6. Quality control of testing process
  • 7. Response to backflow incidents
  • Establish backflow incident response plan
slide-31
SLIDE 31

31

Certifications

  • Cross Connection Control Specialist
  • CDPH definition: a person certified as a cross-

connection control program specialist by the CA- NV section of AWWA or an organization with equivalent requirements

  • Backflow Prevention Assembly Tester
  • 8. Public Education For Consumers
  • Residential
  • Mailers
  • Bill stuffers
  • Consumer confidence reports
  • Commercial / Institutional / Industrial
  • How will you reach them?
slide-32
SLIDE 32

32

  • 9. Record Keeping
  • Record keeping for CCC program
  • Master list of service connections
  • Surveyed response
  • Hazard assessment
  • Device installation, inspection and testing
slide-33
SLIDE 33

33

CA Regulations

  • CA Title 17 §7584 requires a water supplier to

implement a CCCP that addresses §7585-7605

  • Adopt operating rules or ordinances to implement

the program

  • Conduct surveys of premises to identify hazards
  • Provisions of backflow protection
  • Provision of a person trained in cross connection

control

  • Maintenance of records of locations, tests and

repairs of devices

You're The Inspector! How Would You Fix it?

Exercise....

slide-34
SLIDE 34

34

A Few Case Studies....

Port of Sacramento - 1985 Soft Drink Bottling Plant Located About 2 Miles From The Port Facilities

(Note the backflow device)

slide-35
SLIDE 35

35

Conveyor Belt at Port Facilities

Schematic of Grain Handling Facilities Any Problem Here?

slide-36
SLIDE 36

36

What Can We Learn From This Event?

  • There may be many installed devices, but not

necessarily in the right places

  • The cost of an “event” can be enormous (embargoed

and destroyed soft drinks were worth millions of $$)

  • Undetected “events” may be occurring without
  • bvious signs
  • Re-inspections of older, existing facilities is essential

(CCC is not like a building code!)

slide-37
SLIDE 37

37 Caltrans I-5 Rest Stop, Red Bluff Southbound (Routine Annual Inspection - 1999) Caltrans I-5 Rest Stop, Red Bluff Southbound (Routine Annual Inspection - 1999)

slide-38
SLIDE 38

38 Caltrans I-5 Rest Stop, Red Bluff Southbound (Routine Annual Inspection - 1999)

Caltrans I-5 Rest Stop – After Modifications

slide-39
SLIDE 39

39

Colusa High School - 2002 Colusa High School - 2002

slide-40
SLIDE 40

40

Colusa High School - 2002 Flow-through Situations

  • Flow through condition in piping that is

neither owned or controlled by the water utility

  • More than one service connection to the

same customer

  • Case study: Lime Saddle Estates MHP – Butte

County

slide-41
SLIDE 41

41

Lime Saddle Estates MHP

Any cause for concern?

slide-42
SLIDE 42

42

Connecticut, 1982

  • Propane gas in

water mains

  • Hundreds

evacuated

  • Explosions
  • 90 psi forced

2,000 cubic feet

  • f gas into the

water mains

slide-43
SLIDE 43

43

In Closing…..

  • Know your system and the possible

contamination risks!

  • Train your staff to recognize cross

connections!

  • Have a cross connection program and use

it!

  • Seek advice from “experts in the field”, i.e.

RCAC and others

Questions / Discussion

slide-44
SLIDE 44

44

slide-45
SLIDE 45

45

slide-46
SLIDE 46

46

Thank You For Attending!

Neil Worthen nworthen@rcac.org John Hamner jhamner@rcac.org