2025-023 - Addendum to Transit Zoning Code Environmental Impact Report

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• Construction activities associated with implementation of the proposed Transit Zoning Code (SD 84A and SD 84B) would result in the release of hazardous materials to the environment through reasonably foreseeable upset and accident conditions. (impact 4.5-2: Less Than Significant with mitigation) • Construction activities associated with the implementation of the Transit Zoning Code would result in the handling of hazardous materials, substances, or waste within one- quarter mile of an existing school. (impact 4.5-3: Less Than Significant without mitigation) • The Transit Zoning Code (SD 84A and SD 84B) includes sites which are included on a list of hazardous materials sites and as a result, would create a significant hazard to the public or environment. (Impact 4.5-4: Less Than Significant with mitigation) • Construction activities associated with the implementation of the Transit Zoning Code could result in a safety hazard for people residing or working in the project area. (Impact 4.5-5: Less Than Significant with mitigation) • The Transit Zoning Code could impair the implementation of, or physically interfere with, an adopted emergency response plan or emergency evacuation plan resulting in a significant impact. (Impact 4.5-6: Less Than Significant with mitigation) TZC EIR Mitigation Measures MM4.5-1 When sites that are listed in the EDR Report initiate project development, the project applicant shall prepare a Phase I ESA for the proposed site. The Phase I ESA shall be prepared in accordance with ASTM E-1527-05 "Standard Practice for Environmental Site Assessments: Phase I Environmental Site Assessment Process" (November 1, 2006). The purpose of a Phase I ESA is to identify environmental conditions at a proposed project site that may suggest environmental contamination. The Phase I ESA report shall be prepared by a CA EPA Registered Environmental Assessor or similarly qualified individual prior to initiating any construction activities at the site. If recommended in the Phase I ESA, the project sponsor shall undertake (or require the responsible party to undertake) a Phase Il ESA soil sampling plan; or if any environmental contamination is identified by the Phase I ESA, the project sponsor shall implement (or require the responsible party to implement) the recommendations of the report to further investigate and to remove any soil contamination. (Impact 4.6-2) MM4.5-2 In the event that previously unknown or unidentified soil and/or groundwater contamination that could present a threat to human health or the environment is encountered during construction in the Transit Zoning Code (SD 84A and SD 84B) area, construction activities in the immediate vicinity of the contamination shall cease immediately. If contamination is encountered, a Risk Management Plan shall be prepared and implemented that (1) identifies the contaminants of concern and the potential risk each contaminant would pose to human health and the environment during construction and post-development and (2) describes measures to be taken to protect workers, and the public from exposure to potential site hazards. Such measures could include a range of options, including, but not limited to, physical site controls during construction, remediation, long-term monitoring, post-development maintenance or access limitations, or some combination thereof. Depending on the nature of contamination, if any, appropriate agencies shall be notified (e.g., Santa Ana Fire Department). If needed, a Site Health and Safety Plan that meets Occupational Safety and Health Administration requirements shall be prepared and in place prior to commencement of work in any contaminated area. (impact 4.5-2) January 2025 32 Environmental Analysis Resolution No. 2025-023 Page 40 of 65