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Section 5 <br />Regulatory Records Review <br />As part of the Phase I Environmental Site Assessment local agencies such as <br />Orange County Fire Authority (0CFA), Orange County Health Care Agency <br />(OCHCA), California Department of Toxic Substances Control (DTSC), and State <br />Water Resources Control Board (SWRCB) were contacted, and State and <br />Federal databases were reviewed to determine if Centennial Park, or any <br />adjacent properties, were listed as hazardous waste generators, underground <br />storage tank releases (UST), or as having other environmental concerns (i.e., <br />spill, leak, or above-ground tank). Environmental sites identified within one mile <br />of the project site are shown in Figure 20, Based on the review of available <br />environmental database and other readily accessible regulatory information, <br />none of the sites identified Figure 20 showed any evidence of existing <br />environmental concerns related to a release of hazardous substances or <br />petroleum products on either Centennial Park or any adjacent properties. <br />Because there is no evidence of presence of a contaminated of plume in the <br />vicinity of the injection well sites, there would be no concern the potential ground <br />water mounding from the injection wells would cause an existing contaminated <br />plume to migrate. Additionally, it is noted that the groundwater mounding occurs <br />in the deeper aquifers and does not affect the shallow aquifer. <br />Vapor Encroachment Screen <br />A Vapor Encroachment Screen (VES) for Centennial Park property was <br />performed to evaluate whether sites that store or dispose Of potential chemicals <br />of concern or have documented releases, could migrate as vapors onto the <br />property. The Vapor Encroachment Screen (VES) performed at the subject <br />property concluded that then- is no potential Vapor Encroachment Condition, due <br />to the lack of known or suspected contaminated properties within the property, <br />Groundwater Quality Data <br />Numerous wells have been installed throughout the Orange County Groundwater <br />Basin by OCWD and other entities. OCWD uses these wells to monitor <br />groundwater quality and groundwater levels throughout the basin. All wells that <br />have been sampled for water quality analyses within two miles of mid -basin <br />injection area are shown in Figure 21 and were queried from OCWD's WRMS for <br />constituents with a State or Federal Primary Maximum Contaminant Level (MCL) <br />or State Notification Level (NL) between May 1, 2005 and May 1, 2015, The <br />water quality data from nearby wells and regulatory records indicate absence of <br />groundwater contamination plumes within two miles of the mid-basin injection <br />site. <br />Mid Basin Centennial Park Adld�� Project Final EIR 5-121 <br />