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 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
IRWD Wastewater Treatment Michelson and Los Alisos Water RecyclingPlants 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
Definition of Dual-PlumbedTitle 22 60301.250. Dual plumbed system."Dual plumbed system" or "dual plumbed" means a system thatutilizes separate piping systems for recycled water and potablewater within a facility and where the recycled water is used foreither 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-PlumbedTitle 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 watersince 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 RegulationsSection 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 valvesand seals.
The Process - DesignRecycled water signs are required to be placedon the restroom wall.
The ProcessPlan CheckPlan review schematic to assist in the plan checkprocess.
The ProcessEngineering ReportTitle 22- 60314. Report submittal.The engineering report containsinformation such as:•Type of facility;•Average number of persons estimatedto be served on a daily basis;•Boundaries of the project site; and•Persons responsible for operation ofbuilding.
The ProcessConstruction 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.
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 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.
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 ConstructionProcess:1. Plan checks and reviews plumbing plans of dual-plumbed buildings;2. Approves dual-plumbed building plumbing plans only after IRWD approves the plans; and3. 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 ofOccupancy: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; and3. When all punch list items from the City of Irvine are completed a Final Certificate of Occupancy is issued.
The Process - SubsequentTestingTitle 22 - Section 60316:The recycled water system shall also be testedfor possible cross connections at least onceevery four years.IRWD:Works on a Pressure Differential Test.
First dual-plumbed buildingsserved with recycled water in1991
Where are we now? IRWD currently serves 48 dual-plumbed buildings, with 3 more in the process.