4A Public Hearing 2015 0120 - Laserfiche WebLink

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City of San Leandro Housing Element Update (2015-2023) Project Initial Studv and Environmental Checklist g) Place housing within a 100 -year flood hazard area as mapped on a federal Flood Hazard Boundary or Flood Insurance Rate ❑ Less Than ® ❑ Map or other flood hazard delineation map? Significant IX. HYDROLOGY AND WATER UALITY Q Potentially Significant With Mitigation Less Than No Would the project: Impact Incorporated Significant Impact a) Violate any water quality standards or waste discharge re- ❑ ❑ ® ❑ quirements? b) Substantially deplete groundwater supplies or interfere sub- ry, or death involving flooding, including flooding as a result ❑ ❑ stantially with groundwater recharge such that there would be ❑ ❑ ® ❑ a net deficit in aquifer volume or a significant lowering of the j) Expose people or structures to a significant risk of inundation local groundwater table level? ❑ ® ❑ c) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a ❑ ❑ ® ❑ stream or river, in a manner which would result in substantial erosion or siltation on- or off-site? 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? e) Create or contribute runoff water which would exceed the ❑ ❑ ❑ ❑ capacity of existing or planned stormwater drainage systems? f) Otherwise substantially degrade water quality? ❑ ❑ ® ❑ g) Place housing within a 100 -year flood hazard area as mapped on a federal Flood Hazard Boundary or Flood Insurance Rate ❑ ❑ ® ❑ Map or other flood hazard delineation map? h) Place within a 100 -year flood hazard area structures which ❑ ❑ ® ❑ would impede or redirect flood flows? i) Expose people or structures to a significant risk of loss, inju- ry, or death involving flooding, including flooding as a result ❑ ❑ ® ❑ of the failure of a levee or dam? j) Expose people or structures to a significant risk of inundation ❑ ❑ ® ❑ by seiche, tsunami, or mudflow? a) Wllould the project violate any mater quality standards or waste discharge requirements? Potential future development or redevelopment that is associated with implementation of the Housing Element could affect drainage patters and increase the overall amount of impervious surfaces, thus creating changes to stormwater flows and water quality. Increasing the total area of impervious surfaces can result in a greater potential to introduce pollutants to receiving waters. Urban runoff can carry a variety of pollutants, such as oil and grease, metals, sediments, and pesticide residues from roadways, parking lots, rooftops, and landscaped areas and deposit them into an adjacent waterway via the storm drain system. New construction could also result in the degradation of water quality with the clearing and grading of sites, releasing sediment, oil and greases, and other chemicals to nearby water bodies. However, residential development anticipated by the Housing Element would be located in the urbanized areas of San Leandro or areas previously zoned for residential use, which generally have already been developed and currently have a high percentage of impervious surfaces. In addition, potential housing will be required to comply with the National Pollutant Discharge Elimination System (NPDES) Permit and implementation of the construction Storm Water Pollution Prevention Plan (SWPPP) that require the incorporation of Best Management Practices (BMWs) to control sedimentation, ero- Page 133