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HomeMy WebLinkAboutPages from 2019 Green BldgNONRESIDENTIAL MANDATORY MEASURES 5.304.6 Outdoor potable water use in landscape areas. For public schools and community colleges, landscape projects as described in Sections 5.304.6.1 and 5.304.6.2 shall comply with the California Department of Water Resources Model Water Efficient Landscape Ordinance (MWELO) commenc- ing with Section 490 of Chapter 2.7, Division 2, Title 23, California Code of Regulations, except that the evapotranspi- ration adjustment factor (ETAF) shall be 0.65 with an addi- tional water allowance for special landscape areas (SLA) of 0.35. Exception: Any project with an aggregate landscape area of 2,500 square feet or less may comply with the prescrip- tive measures contained in Appendix D of the MWELO. 5.304.6.1 Newly constructed landscapes. New construc- tion projects with an aggregate landscape area equal to or greater than 500 square feet. 5.304.6.2 Rehabilitated landscapes. Rehabilitated land- scape projects with an aggregate landscape area equal to or greater than 1,200 square feet. SECTION 5.305 WATER REUSE SYSTEMS 5.305.1 Recycled water supply systems. Recycled water supply systems shall be installed in accordance with Sections 5.305.1.1, 5.305.1.2, and the California Plumbing Code. 5.305.1.1 Outdoor recycled water supply systems. All newly constructed nonresidential developments, where disinfected tertiary recycled water is available from a municipal source to a construction site, shall be provided with both a potable water supply system and a recycled water supply system. The recycled water supply system shall allow the use of reclaimed (recycled) water for abo- veground and subsurface irrigation to all landscape irriga- tion systems. For the purposes of Section 5.305.1.1, when a recycled water supply pipe is located within 300 feet from a con- struction site boundary, it shall be considered that reclaimed (recycled) water is available from a municipal source. Exceptions: 1. Service areas in which the only reclaimed (recy- cled) water is used for potable purposes, or in which net nonpotable deliveries are anticipated to remain level or decrease as a result of the potable reuse project. 2. Where access to disinfected tertiary recycled water is not feasible and/or cost-efficient, as determined by the authority having jurisdiction in consultation with the recycled water purveyor. Note: A city, county, or city and county, in consultation with the recycled water purveyor, may further reduce the area for the mandate to install recycled water supply systems if the recycled water purveyor is unable to accom- modate new services or unable to provide uninterruptable service. 3. A potable water supply system is not required for landscape irrigation if the landscape irrigation system is supplied with recycled water at the time of final inspection. 4. Potable water may be used with the recycled water supply system on a temporary basis, as allowed by the authority having jurisdiction in consultation with the recycled water purveyor. 5.305.1.2 Technical requirements for outdoor recycled water supply systems. Recycled water supply systems for outdoor applications shall meet the requirements of this code, and the California Code of Regulations, Title 17, Division 1, Chapter 5, Subchapter 1; Title 22, Division 4, Chapter 3; and Title 23, Division 2, Chapter 2.7, as appli- cable. 2019 CALIFORNIA GREEN BUILDING STANDARDS CODE 43