Dual Plumbed Buildings (Irvine Water Ranch District)

DUAL-PLUMBED BUILDINGS Presentation

November 9, 2010

TopicsAbout IRWDDefinition of Dual-PlumbedIRWD’s Program Administration Rules & Regulations Requirement to UseThe Process Pre-Design Plan Check Engineering Report Construction Inspection Temporary Domestic Water by-Pass required for Cross-Connection Test to

activate Recycled WaterCity of Irvine’s Role Plan Check and Permits Temporary Certificate of Occupancy and Final Certificate of Occupancy Where are we now

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+

IRWD Service Area

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

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

IRWD Wastewater Treatment Michelson and Los Alisos Water Recycling Plants provide recycled water at IRWD

Definition of Dual-PlumbedTitle 2260301.250. 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.

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.

IRWD’s AdministrationRequirement 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”

IRWD’s AdministrationRequirements to UseIRWD’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.”

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.”

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.

The Process - Design The recycled water pipe is wrapped with purple

mylar identification tape; and Proximity of recycled water to potable water.

The Process – DesignRecycled water valves contain locking ball valves and seals.

The Process - DesignRecycled water signs are required to be placed on the restroom wall.

The ProcessPlan CheckPlan review schematic to assist in the plan check process.

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.

The ProcessEngineering Report

The ProcessConstruction

The ProcessConstruction Inspection60316 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.

The ProcessTemporary Domestic Water By-Pass ConnectionTitle 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.

The ProcessCross-Connection Testing The On-Site Recycled Water Group & Cross-

Connection Control Group conduct cross-connection test.

• 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.

The Process

The ProcessMeter 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.

City of Irvine’s RolePlumbing 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.

City of Irvine’s RoleTemporary 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.

The Process - Subsequent TestingTitle 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.

First dual-plumbed buildings served with recycled water in 1991

Where are we now? IRWD currently serves 48 dual-plumbed

buildings,with 3 more in the process.

Dual-Plumbed Buildings Site

Dual-Plumbed Building SiteRecycled water serves cooling towers of dual-plumbed buildings located on rooftop

Dual-Plumbed Building SiteIrrigation on top of Dual-Plumbed building

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

Dual-Plumbed Building Site2-story dual-plumbed building

Dual-Plumbed Family Lots

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Acr

e Fe

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Years

Recycled Water Customers1969-2010

LANDSCAPE IRRIG-RECL WATER COMMERCIAL/RECL WATER-TOILETS RESID/LNDSCPE-NEWPORT CST-RECL

3897

546

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

Day #2 of Construction

Final stages of modular construction at a new high school

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

Questions?