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3.2 Contaminant Migration Migration of petroleum hydrocarbon or volatile organic compound (VOC) contamination is t/ generally via groundwater. erefore, LLonly_.illose__.G9ntaminant release sites located hydrologically upgradient relative to the subject properly are expected to represent a potential environmenta concern to the su pec property. Contaminated sites located hydrologically downgralient of the sulijecl'"propert}y-m'e-not expected to represent a potential threat to the groundwater quality beneath the subject property. Sites that are situated hydrologically cross- gradient relative to the subject property are not expected to represent a concern unless close proximity allows for the potential of lateral migration. As discussed in Section 2., groundwater in the vicinity of the subject property is assumed to flow to the north. 3.3 Record Details National Priorities List (NPL) is EPA's national listing of contaminated sites targeted for cleanup because they pose a threat to human health and the environment. The Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA or Superfund) authorizes and requires the EPA to investigate, categorize, and enforce the cleanup of hazardous waste sites on the NPL. An NPL site on or near a particular property may threaten the environmental integrity of the property or affect its marketability. No sites within a 1-mile radius of the subject property were identified during the NPL database search. ll'ICORRACTS is an EPA-maintained database of Resource Conservation and Recovery Act (RCRA) facilities undergoing "corrective action". A "corrective action order" is issued when there has been a release of hazardous waste or constituents into the environment from a RCRA facility. Corrective actions may be required beyond the facility's boundary and can be required regardless of when the release occurred, even if it predates RCRA. No sites within a 1-mile radius of the subject property were identified during the CORRACTS /database search. �/ California Sites (CalSites) are provided by the California Environmental Protection Agency, Department of Toxic Substances Control and include state equivalent NPL (SPL) and CERCLIS (SCL) sites. No sites within a 1-mile radius of the subject property were identified during the CalSites database search. k�CERCLIS and CERCLIS/NFRAP are lists of sites that the EPA has investigated or is presently investigating for release or threatened release of hazardous substances, which may be subject to review in accordance with the terms and conditions of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA, also known as Superfund). Sites listed on the "No Further Remedial Action Planned" (NFRAP) database are sites where, following an initial investigation, no contamination was found, contamination was removed Environmental Transaction Screen AE i Project No.262905 January 18,2007 Page 8