Hampden Water District
Cross Connection Control Program
I. SUMMARY
This
program is designed to prevent the contamination of drinking water by the
backflow of water or other liquids,
gases,
mixtures, compounds, or other substances into the Public Water
Distribution System of the HAMPDEN
WATER
DISTRICT from a source or sources other than its intended sources.
II. AUTHORITY
This program
gains its enforceability from Title 22, M.R.S., sub-chapter 2, section 2612(5)
Maine Department of
Human
Services Cross Connection Rules number 10-144A CMR 226. In addition, authority
arises from provisions in
the State of
Maine Plumbing Code, Occupational Safety and Health Act, as well as from the
Rules and Regulations by
the HAMPDEN
WATER DISTRICT and approved by the Maine Public Utilities commission.
III. DEFINITIONS
A.
Anti-backflow device - a device or means to prevent backflow.
B.
Approved source- a source of water utilized by a public water system for
distribution to the public for
consumption or other purposes and which is approved by the Department of Human
Services for said use
following an approved treatment process, if any, required by the Department.
C.
Backflow - the flow of water or other foreign liquids, gasses, mixtures,
compounds or other substances into the
public water distribution system from any other than intended.
D.
Backflow preventer - a device or means to prevent backflow, sub-defined as
follows:
1. Air gap - A physical separation sufficient to prevent backflow between the
free flowing
discharge end of the potable water system and any other system.
2. Atmospheric vacuum breaker - a device that prevents back siphonage by
creating an atmospheric vent
where there is either a negative pressure or a sub-atmospheric pressure in a
water system.
3. Backflow preventers w/immediate atmospheric vent - a device having two check
valves separated by an
atmospheric vent.
4. Double check valve assembly - a device having two spring loaded bronze face
valves with soft rubber
discs and test cocks for periodic testing.
5. Hose bib vacuum - a device that is permanently attached to a hose bib and
which acts as an
atmospheric vacuum breaker.
6. Pressure vacuum breaker - a device containing a spring loaded check valve and
a spring-loaded
atmospheric vent, which opens when the pressure approaches atmospheric. It
contains valves and
fittings, which allow for periodic testing.
7. Reduced pressure principle backflow preventer - an assembly of check valves
and a reduced
zone, which spills water to the atmosphere in the event of failure of the check
valves. It has valves
and fittings which allow for periodic testing.
8. Residential dual check valve - an assembly of two independently acting check
valves used primarily on
residential and low-hazard services.
E. Back
Pressure- a condition where the owner's pressure is greater than the supplier's
system pressure,
causing a reversal of the normal direction of flow.
F.
Back-siphonage - backflow resulting from negative pressure in the distribution
pipes of a public water supply
system.
G.
Containment - a method of backflow prevention, which requires a backflow
preventer at the water service
entrance.
H.
Cross-connection - Any actual or potential connection between the public water
supply and a source of
contamination or pollution.
I.
Department - State of Maine, Department of Human Services.