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ARROYO LAGO RESIDENTIAL PROJECT ADDENDUM 126 FCS Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480036/Addendum/21480036 Arroyo Lago Residential Project Addendum.docx as fuels, lubricants, and household cleaners. Consistent with the analysis in the Prior FEIR, compliance with applicable federal, State, and local laws and regulations regarding hazardous materials, including the Hazardous Materials Transportation Act, California Public Resources Code, and the City’s General Plan (including Public Safety Element Policy 17, which seeks to “ensure that hazardous materials are not released as a result of construction activities and that any existing hazardous materials and potential contamination are remediated prior to development”), would reduce and limit any such potential associated risks, and impacts in this regard would be less than significant, consistent with the impact conclusions of the Prior FEIR. 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. b) Risk of Upset Would the project: Create a significant hazard to the public or the environment through reasonably foreseeable upset and accident conditions involving the release of hazardous materials into the environment? Prior FEIR Conclusions Phase I Environmental Site Assessments (Phase I ESAs) were conducted for both the residential site and off-site improvement areas, and no Recognized Environmental Conditions (RECs) were identified. The Former Hanson Aggregate Radum Facility is classified as a Controlled REC (CREC), but nearby sites were evaluated and found not to pose a concern to the project site. The Prior FEIR found that, because the project site remains under active regulatory oversight with long-term management requirements, there is potential for exposure to impacted soil or groundwater if such materials are not properly handled. However, the County Project would be required to comply with the ACDEH-approved Soil Management Plan and Soil Import Management Plan, which establishes procedures for identifying, segregating, testing, and properly managing any impacted materials encountered during construction, which would ensure potential hazards to the project site and to the public are minimized. Additionally, vapor migration was also assessed and determined to be unlikely. Areas of Concern (AOCs) 6 and 7 were evaluated through historical investigations and subsequent sampling; results indicated that subsurface conditions in both areas do not pose a risk to human health or the environment. None of the County Project’s on-site or off-site improvements would be constructed within these AOCs. The County Project would comply with applicable health and safety laws and regulations to prevent accidental releases. As discussed above, construction activities would require the use of commercially available typical hazardous materials and may generate small amounts of hazardous waste. The Prior FEIR disclosed that the use, storage, transportation, and disposal of hazardous materials at the project site could result in the accidental release of hazardous materials into the environment. However, the County Project would be required to comply with applicable mandatory federal, State, and local laws and regulations, which would reduce the potential for an accidental release of hazardous materials. In the event of an accidental release, the ACFD and ACDEH would be notified