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ARROYO LAGO RESIDENTIAL PROJECT <br /> ADDENDUM <br /> <br /> <br />134 FCS <br />Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480036/Addendum/21480036 Arroyo Lago Residential Project Addendum.docx <br />Environmental Issue <br />Area <br />Conclusion <br />in Prior FEIR <br />Do the <br />Proposed <br />Changes <br />Involve New or <br />More Severe <br />Impacts? <br />New <br />Circumstances <br />Involving New <br />or More Severe <br />Impacts? <br />New <br />Information <br />Requiring New <br />Analysis or <br />Verification? <br />Mitigation <br />Measures <br />d) In flood hazard, <br />tsunami, or seiche <br />zones, risk release <br />of pollutants due to <br />project inundation? <br />Less than <br />significant <br />impact <br />No No No NA <br />e) Conflict with or <br />obstruct <br />implementation of a <br />water quality control <br />plan or sustainable <br />groundwater <br />management plan? <br />Less than <br />significant <br />impact <br />No No No NA <br /> <br />Discussion <br />a) Water Quality <br />Would the project: Violate any water quality standards or waste discharge <br />requirements or otherwise substantially degrade surface or ground <br />water quality? <br />Prior FEIR Conclusions <br />The Prior FEIR found that construction activities such as grading and excavation could introduce <br />pollutants (e.g., sediment, fuel, concrete, litter) into stormwater runoff. However, the County Project <br />would be subject to the California State Water Resources Control Board’s (State Water Board’s) <br />NPDES General Permit for Construction Activities, requiring a SWPPP with site-specific BMPs. These <br />measures would minimize erosion and control pollutant discharge. During operations, increased <br />impervious surfaces could elevate urban runoff pollutants, but the County Project would comply with <br />the County’s Municipal Regional Permit (MRP), which includes Low Impact Development (LID) <br />standards and post-construction monitoring. <br />With respect to Alternative 2, the Prior FEIR determined that development would be located west of El <br />Charro Road in the Federal Emergency Management Agency (FEMA) Flood Hazard Zone X, avoiding <br />flood hazard areas and reducing potential impacts related to flooding and water quality. As such, <br />impacts under Alternative 2 would be lower than those under the County Project, although the impact <br />conclusions remained the same under both the County Project and Alternative 2. (Draft EIR, p. 6-16).