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Objective Development Standards City Council Draft Code Amendments A-101 11. Manual shut-off valves (such as a gate valve, ball valve, or butterfly valve) shall be required, as close as possible to the point of connection of the water supply, to minimize water loss in case of an emergency (such as a main line break) or routine repair. 12. Backflow prevention devices shall be required to protect the water supply from contamination by the irrigation system. 13. The irrigation system shall be designed to prevent runoff, low head drainage, overspray, or other similar conditions where irrigation water flows onto non-targeted areas, such as adjacent property, non-irrigated areas, hardscapes, roadways, or structures. Weather- based irrigation controllers, soil moisture-based controllers or other self-adjusting irrigation controllers shall be required for all irrigation systems. 14. In mulched planting areas, the use of low volume irrigation is required to maximize water infiltration into the root zone. 15. Sprinkler spacing shall be designed to achieve to achieve a uniform precipitation rate with no overspray onto hardscapes. 16. Swing joints or other riser-protection components are required on all risers subject to damage that are adjacent to high traffic areas. 17. Check valves or anti-drain valves are required for all irrigation systems. 18. Narrow or irregularly shaped areas, including turf, less tha n eight feet in width in any direction shall be irrigated with subsurface irrigation or low volume irrigation system. Overhead irrigation shall not be permitted within 24 inches of any non-permeable surface. Allowable irrigation within the setback from non-permeable surfaces may include drip, drip line, or other low flow non-spray technology. 19. For the efficient use of water, all irrigation schedules shall be developed, managed, and evaluated to utilize the minimum amount of water required to maintain plant h ealth. Irrigation scheduling shall be regulated by automatic irrigation controllers. Overhead irrigation shall be scheduled between 8:00 p.m. and 10:00 a.m. unless weather conditions prevent it. If allowable hours of irrigation differ from the local water purveyor, the stricter of the two shall apply. Operation of the irrigation system outside the normal watering window is allowed for auditing and system maintenance. 20. Stabilizing mulching products shall be used on slopes. It is highly recommended that bio based products are used and petroleum based products are avoided. 21. Compost shall be specified as the soil amendment according to the outcome of the soil analysis, to bring the soil organic matter content to a minimum of 3.5 percent by dry weight or one inch of compost. Adding compost is waived if the plant palette primarily includes plants that are adapted to soils with little or no organic matter as documented by a published plant reference. If imported or site soil meets the organic content of 3.5 percent, the compost requirement is waived. 150