20A - AA FIRST ST BRIDGE REPLACEMENT PROJECT

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LSA ASSOCIATES, INC. INITIAL STUDYIMITIGATED NEGATIVE DECLARATION JULY 2010 FIRST STREET BRIDGE REPLACEMENT PROJECT CITY OF SANTA ANA HM-6 To ensure that utility owners mark the locations of underground transmission lines and facilities, notify the Underground Service Alert of Southern California by calling 1-800-227- 2600 at least two working days prior to subsurface excavation. HM-7 As is the case for any project that proposes excavation, the potential exists for unknown hazardous contamination to be revealed during construction of the proposed First Street Bridge widening improvements. For any previously unknown hazardous waste/material encountered during construction, the procedures outlined in Appendix E, Caltrans Unknown Hazards Procedures for Construction, will be followed. B. Create a significant hazard to the public or the environment through reasonable foreseeable upset and accident conditions involving the release of hazardous material into the environment? Less than significant impact. The proposed project does not have the potential to create a hazard to the public or environment through upset or accident conditions that may lead to release of hazardous materials. No chemicals will be used in the replacement of the bridge structure and street widening or during the operation of the project that could result in foreseeable release of the hazardous materials. However, the northern and southern bridge structure that will be demolished may contain lead-based construction materials and asbestos, which will be removed and disposed of in accordance with State and federal laws regulating asbestos remediation and disposal. The construction of the additional through lanes on the First Street is not anticipated to create hazards to the public or environment. The street may contain some traffic stripes and pavement-marking materials of the paint, however, they will be tested, removed and disposed of to the Class I disposal site. Mitigation Measures HM-1 through HM-4, and HM-7 will further reduce the potential impact associated with ACMs and lead- based materials that may occur during demolition of the bridge to less than significant levels. C. Emit hazardous emissions or handle hazardous or acutely hazardous materials, substance or waste within one-quarter mile of an existing or proposed school? Less than significant impact. The operation of the proposed project would not emit or involve handling of hazardous materials or substances because the project is constrained to a bridge replacement and street widening. No hazardous materials are associated with these uses. No existing or proposed schools are located within the one-quarter from the project site. Less than significant impacts are anticipated and the mitigation measures HM-1 through HM-4 will help to further reduce the impacts. D. Be located on a site which is located on a list of hazardous materials sites compiled pursuant to Government Code Section 659662.5 and, as a result, would it create a significant hazard to the public or the environment? Less than significant impact. The project is located in a built-out area, and previous uses of this site have not involved the use or operation of any hazardous materials. However, according to the ISA (LSA, July 2010) five known releases of hazardous substances occurred within 0.33 mile of the project vicinity, consisting of Leaking Underground Storage Tanks (LUST). Three leaking underground storage tanks (LUSTS) containing gasoline were issued closure letters and therefore, are not considered to pose a concern to the project site. Two other LUSTS affected groundwater and are currently undergoing remediation. According to records obtained from the RWQCB and the 07/25/10 «P:\DMJ0701\MND\4.0 Environmental Analysis.doc» 4-19 20A-70