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ARROYO LAGO RESIDENTIAL PROJECT ADDENDUM FCS 87 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480036/Addendum/21480036 Arroyo Lago Residential Project Addendum.docx Therefore, under Design Option B, the County Project would be required to implement MM BIO-2a 25 and MM BIO-2b, which include obtaining a Construction General Permit from the RWQCB, preparing a Storm Water Pollution Prevention Plan (SWPPP), and implementing BMPs. Additional measures require installation of silt fencing and straw wattles, monitored by a qualified Biologist, and post- construction stormwater management to prevent pollution and hydromodification. Therefore, the Prior FEIR concluded that impacts with respect to any riparian habitat or other sensitive natural community would be less than significant with mitigation incorporated. (Draft EIR, pp. 3.3-28, 6-13). Proposed Project Analysis and Conclusion Similar to the County Project, 5.87 acres of Fremont poplar and mixed willow stands, as well as a drainage swale, which contains riparian habitat, are located east of the project site. The proposed bioretention area and detention basin, to be located off-site east of the proposed residential development portion of the project site, would be in close proximity to the existing drainage swale and associated riparian vegetation. As such, the proposed project could result in pollutant loading, increased erosion and sedimentation, and trash or debris dispersal in the adjacent drainage swale. As such, MM BIO-2a and MM BIO-2b would still be required to reduce potentially significant impacts to sensitive riparian areas and water quality in the drainage swale. With the implementation of these mitigation measures, impacts on riparian habitats or other sensitive natural communities would be reduced to a less than significant level. Therefore, the proposed project would not introduce new significant impacts or create substantially more severe significant impacts than those previously identified in the Prior FEIR. No additional analysis is required. c) Federally Protected Wetlands Would the project: Have a substantial adverse effect on State or federally protected wetlands (including, but not limited to, marsh, vernal pool, coastal, etc.) through direct removal, filling, hydrological interruption, or other means? Prior FEIR Conclusions The Prior FEIR found that the County Project would avoid any direct or indirect impacts to State or federally protected waters and/or wetlands because the County Project would not impact the water quality of the potential depressional wetland within the eastern portion of the Study Area, which is the only potential jurisdictional feature within the project site. The closest proposed project component, a storm drain outfall, would be located more than 120 feet from the potential depressional wetland feature and would not result in direct or indirect impacts. Therefore, the Prior FEIR concluded that impacts would be less than significant. (Draft EIR, pp. 3.3-35, 6-13). 25 Note: The National Pollutant Discharge Elimination System (NPDES) was inadvertently misidentified as the “National Pollutant Discharge Effluent Standards” in MM BIO-2a of the Prior FEIR. MM BIO-2a, as detailed below, has been revised to correct this minor typographical error.