55C - ALTON AVE OVERCROSSING @ SR 55

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Draft Findings of Fact and Mitigation Monitoring Reporting Program (applies to CEQA only) Supplemental Initial Site Assessment (2003), and Phase II Environmental Site Assessment, (2005) there are numerous facilities located adjacent to the proposed project that handle, use, and/or store hazardous waste and/or materials. During construction, these facilities could potentially expose the public and construction workers to hazardous waste/materials. Acquisition Properties Based on the Phase II Environmental Site Assessment (ESA, 2005) was performed by Leighton Consulting, Inc. (Leighton Consulting) for all acquisition properties where there was a potential for hazardous waste/materials as identified in the ISA (1999) and Supplemental ISA (2003), the following sites have been identified as potential contaminant sources. The Phase II ESA involved several activities such as: obtaining and analyzing soil and groundwater samples on seven full acquisition sites (Sites No. 10, 11, 12, 13, 14, 15, and 17); reviewing a draft preliminary Endangerment Assessment Report (Site No.9); conducting a site reconnaissance on three partial acquisitions sites (Sites No. 44, 74, and 77); and reviewing a Phase I ESA for the final partial acquisition site (Site No. 75) identified in Table 4.3-1. A synopsis of the most recent hazardous waste/materials information for each of the sites and the hazardous waste concerns for each site are also provided below. Arsenic was not found in the soil in excess of the expected background concentration in any of the sites. · Site No.9 - Santa Ana Plating, 411 East Alton Avenue, Santa Ana (Site No.9) - Full Take According to the Phase II ESA (2005) prepared by Leighton Consulting, this site is subject to Consent Order SRPDOll02 sns-4270 with the Environmental Protection Agency, Department of Toxic Substance Control (DTSC). In lieu of site access, Leighton Consulting was allowed to copy the draft Preliminary Endangerment Assessment (PEA) Report, which was prepared in compliance with the consent order. According to the PEA, arsenic was detected in soil samples, however concentrations were consistent with background concentrations. The reported concentrations of arsenic, total chromium, molybdenum, nickel, selenium and vanadium exceed their respective Tap Water Preliminary Remediation Goals (PRG) in one or more of the groundwater samples. The PEA recommended several tasks to better identify the source, potential off-site sources, and to evaluate potentially affected groundwater resources, including development of a groundwater investigation work plan and performance of a soil gas survey. DTSC may require the owner to implement a remedial action plan for soil and groundwater at this location. This must be considered in negotiations to acquire this property to avoid becoming a potentially responsible party and avoid any unwanted liability. · Site No. 10 - Goodwin International, 3121 South Oak Street, Santa Ana; and Myers Forklift, 3126 South Kilson Drive, Santa Ana - Full Take According to the Phase II ESA (2005), arsenic was detected in soil samples, however, concentrations were consistent with background concentrations. Trichloroethylene (TCE) was detected in groundwater samples collected by Leighton Consulting. The source of contamination is undetermined. · Site No. 17 - Magna Engineering, 3122 South Halladay Street, Santa Ana (Site No. 17) - Full Take During the Phase II ESA (Leighton Consulting, 2005), arsenic present in the soil was within the expected background range for soils in the area. Arsenic and vanadium were detected at concentrations greater than their Tap Water Preliminary Remediation Goals (PRG). The source of groundwater contamination at this site was undetermined. If dewatering activities are required at this site, proper disposal of groundwater is required. Alton Avenue Overcrossing at SR-55 K-13 April July 2005 55C-31