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2014 -2021 SANTA ANA HOUSING ELEMENT AND PUBLIC SAFETY ELEMENT UPDATES CITY OF SANTA ANA 3. Environmental Analysis development site would be connected to the City's storm dr,, n system and is not anticipated to create substantial erosion or siltation on- or off -site. Future development projects would be subject to CEQA review and would adhere to the City's standard practices designed to prevent erosion and siltation during the construction phase. Impacts to the drainage pattern due to the adoption of the Housing Element would be less than significant. d) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, or substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or off -site? Less Than Significant Impact. Approval of the Housing Element would not modify land uses, but implementation relies on future development assumptions. Although Santa Ana is largely built out, increased development intensity could increase the amount of runoff from impervious surfaces. Given that each of the land use change areas are currently developed, however, the increase in impervious surfaces and resultant increase in runoff is anticipated to be nominal and not have the potential to result in flooding on- or offsite. Therefore, any future development would likely have a less than significant impact with regard to surface runoff. Additionally, any future development would be subject to CEQA review and potential drainage patterns and surface runoff impacts would be analyzed. Therefore, impacts due to the adoption of the housing element are less than significant. e) Create or contribute runoff water which would exceed the capacity of existing or planned storm water drainage systems or provide substantial additional sources of polluted runoff? Less Than Significant Impact. The majority of the City is built out, and stormwater drainage systems are already in place. Approval of the Housing Element would not directly modify land uses; however, development in accordance to the Housing could potentially increase the impervious surface area and resultant runoff and discharge of sediments and pollutants to stormwater drainage systems. This increase, however, would be nominal in comparison to existing development and would be subject to compliance with regulatory requirements. Therefore, any future development would likely have a less than significant impact with regard to surface runoff. Additionally, future development would be subject to CEQA review and would comply with the City and NPDES regulations regarding stormwater pollution prevention measures during construction and operation. Therefore, impacts from runoff water due to the adoption of the Housing Element would be less than significant. f) Otherwise substantially degrade water quality? Less Than Significant Impact. The Housing Element designates adequate sites for potential future development that could accommodate any unmet portion of the RHNA through 2021. Construction activities and long -term operation of the future development have the potential to degrade water quality through an increase in water pollutants, including sediments. Future projects would be evaluated on art individual basis for their potential to degrade water quality, and projects must comply with any applicable water quality standards and regulations. Impacts to water quality due to the adoption of the Housing Element would be less than significant. Page 56 • The Planning Center I DCdr'E 75A -78 Decem6er2013