Presentation from the San Diego County Water Authority’s workshop on Recycled Water and Dual Plumbing.

1. DUAL-PLUMBED BUILDINGS
Presentation
November 9, 2010

2. Topics
About IRWD
Definition of Dual-Plumbed
IRWD’s Program Administration
 Rules & Regulations
 Requirement to Use
The Process
 Pre-Design
 Plan Check
 Engineering Report
 Construction Inspection
 Temporary Domestic Water by-Pass required for Cross-Connection Test to
activate Recycled Water
City of Irvine’s Role
 Plan Check and Permits
 Temporary Certificate of Occupancy and Final Certificate of Occupancy
 Where are we now

3. About IRWD
 Public Agency / “Special District”
 Five Elected Board Members
 Serve City of Irvine, portions of Costa Mesa,
Lake Forest, Newport Beach, Orange, Tustin,
unincorporated County of Orange
 Area: 181 square miles (19% of Orange
County)
 Population: 331,500
 Service Connections: 100,584+

4. IRWD Service Area

5. IRWD Services Provided
 Potable Water
– Groundwater
– “Imported” Water
 Wastewater
– 25 million gallons per day treated at two
treatment plants
 Recycled Water
– Irrigation of parks, golf courses,
street/common area landscaping; commercial
building flushing; industrial uses
 Urban Runoff Treatment
– Treats water in San Diego Creek watershed
before it enters Newport Bay/Pacific Ocean

6. IRWD Wastewater Treatment
 Michelson and Los Alisos Water Recycling
Plants provide recycled water at IRWD
 Michelson Water
Recycling Plant currently
treats a maximum of 18
MGD and is under
construction to expand to
28 MGD by summer 2012
 Los Alisos Water
Recycling Plant treats a
maximum of 7.5 MGD

7. Definition of Dual-Plumbed
Title 22
60301.250. Dual plumbed system.
"Dual plumbed system" or "dual plumbed" means a system that
utilizes separate piping systems for recycled water and potable
water within a facility and where the recycled water is used for
either of the following purposes:
(a) To serve plumbing outlets (excluding fire suppression
systems) within a building or
(b) Outdoor landscape irrigation at individual residences.

8. Definition of Dual-Plumbed
Title 22
 60307 states that recycled
water used for flushing
toilets, urinals, priming drain
traps and industrial process
water that may come into
contact with workers shall be
disinfected tertiary recycled
water; and
 Section 60301.230 Defines
disinfected tertiary recycled
water.

9. IRWD’s Administration
Requirement to use recycled water
since 1991 have changed from:
• 5-story building or taller;
• More than 300 people;
• 80,000 square feet; and now
• “Reasonable cost”

10. IRWD’s Administration
Requirements to Use
IRWD’s Rules and Regulations
Section 4.12.2:
• “If recycled water service is determined by the
District to be feasible, applicants for new water
service shall be required to install onsite facilities to
accommodate both potable water and recycled
water service in accordance with these Rules and
Regulations.”
• “The District may also require existing customers to
retrofit existing onsite water service facilities to
accommodate recycled water service.”

11. IRWD’s Administration
“Will Serve Letter” states:
“Recycled Water, if available, is to be used for
all State approved applications, including, but
not limited to: irrigation, toilet and urinal
flushing, and cooling tower make up, as long as
it is at a reasonable cost to the customer. If the
customer believes the cost is unreasonable, it
must provide documentation to that effect to
IRWD for review and approval.”

12. The Process - Pre-Design
 In the pre-design phase the developer finds out
if recycled water is available at their site and for
what uses.

13. The Process - Design
 The recycled water pipe is wrapped with purple
mylar identification tape; and
 Proximity of recycled water to potable water.

14. The Process – Design
Recycled water valves contain locking ball valves
and seals.

15. The Process - Design
Recycled water signs are required to be placed
on the restroom wall.

16. The Process
Plan Check
Plan review schematic to assist in the plan check
process.

17. The Process
Engineering Report
Title 22- 60314. Report submittal.
The engineering report contains
information such as:
•Type of facility;
•Average number of persons estimated
to be served on a daily basis;
•Boundaries of the project site; and
•Persons responsible for operation of
building.

18. The Process
Construction

19. The Process
Construction Inspection
60316 under Operation requirements.
 All dual-plumbed inspections prior to and after recycled water
activation are carried out by an AWWA Cross-Connection
Control Program Specialist.

20. The Process
Temporary Domestic Water By-
Pass Connection
Title 22 - 60316. Operation requirements.
 (a) Prior to the initial operation of the dual-plumbed recycled
water system and annually thereafter, the Recycled Water
Agency shall ensure that the dual-plumbed system within each
facility and use area is inspected for possible cross connections
with the potable water system.

21. The Process
Cross-Connection Testing
 The On-Site Recycled Water Group & Cross-
Connection Control Group conduct cross-
connection test.

22. The Process
• The temporary by-pass is removed after the
cross-connection test is performed and an
electrical conductivity test is performed on the
potable and recycled water meters.

23. The Process
Meter Release
• IRWD will release domestic and recycled
water meters to property when all IRWD
punch list items are complete, i.e. cross-
connection tests, “Correction Notices” and all
fees have been paid for the water meters.

24. City of Irvine’s Role
Plumbing Permit and Construction
Process:
1. Plan checks and reviews plumbing plans of
dual-plumbed buildings;
2. Approves dual-plumbed building plumbing
plans only after IRWD approves the plans;
and
3. Issues plumbing permit for the dual-plumbed
buildings which is necessary for the developer
to begin construction on the building.

25. City of Irvine’s Role
Temporary and Final Certificate of
Occupancy:
1. City requires that IRWD fax over to their office
an official IRWD release of water meters;
2. Prior to owner or tenant moving into dual-
plumbed building a Temporary Certificate of
Occupancy must be acquired from the City;
and
3. When all punch list items from the City of
Irvine are completed a Final Certificate of
Occupancy is issued.

26. The Process - Subsequent
Testing
Title 22 - Section 60316:
The recycled water system shall also be tested
for possible cross connections at least once
every four years.
IRWD:
Works on a Pressure Differential Test.

27. First dual-plumbed buildings
served with recycled water in
1991

28. Where are we now?
 IRWD currently serves 48 dual-plumbed
buildings,
with 3 more in the process.

29. Dual-Plumbed Buildings Site

30. Dual-Plumbed Building Site
Recycled water serves cooling towers of dual-
plumbed buildings located on rooftop

31. Dual-Plumbed Building Site
Irrigation on top of Dual-Plumbed building

32. Dual-Plumbed Building Site
This building has a balcony with irrigation on the
20th floor and its cooling tower is located outside

33. Dual-Plumbed Building Site
2-story dual-plumbed building

34. Dual-Plumbed Family Lots

35. Acre Feet
500
1000
1500
2000
2500
3000
3500
4000
4500
0
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
LANDSCAPE IRRIG-RECL WATER
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
Years
1991
1992
1993
COMMERCIAL/RECL WATER-TOILETS
1994
1995
1996
1997
Customers
1969-2010
1998
1999
2000
2001
2002
Recycled Water
2003
2004
2005
2006
2007
2008
RESID/LNDSCPE-NEWPORT CST-RECL
2009
2010
48
546
3897

36. New Dual-Plumbed School
(Modular Construction -1st day)

37. Day #2 of Construction

38. Final stages of modular
construction at a new high school

39. Last stage of completion for the
new high school, scheduled to open
by December 1, 2010.

40. Questions?