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PL REPORT (June 20, 2003) LOCKEFORD ELEMENTARY SCHOOL EXPANSION 1.1 PEA OBJECTIVES The overall objectives of the PEA include: • Evaluating historical information for indications of the past use, storage, disposal, or release of hazardous wastes/substances at the Site. • Evaluating whether current or past hazardous material management practices or waste management practices have resulted in a release or threatened release of hazardous materials at the Site, or whether naturally occurring hazardous materials are present which pose a threat to children's health, children's learning abilities, public health, or the environment. • Evaluating through a field sampling and analysis program the nature of hazardous materials that may be present in soil, surface water, or groundwater at the Site, their concentration and general extent. • Estimating the potential threat to public health posed by hazardous materials at the Site, using a residential land-use scenario, and performing an ecological risk screening evaluation, if necessary. .Based on information developed during the PEA and the human and ecological risk screening evaluations using the PEA Guidance Manual, DTSC will make an informed decision regarding potential risks posed by the Site. Possible outcomes of the PEA decision include the requirement for further investigation through a remedial investigation/feasibility study (RDFS) process if the Site is found to be significantly impacted by hazardous substances release(s); the need to perform a removal action if localized impacts by hazardous substances release(s) are found; or issuance of a "No Further Action" finding if the Site is found not to be significantly impacted and risks to human health and the environment are found to be within acceptable levels based on the conservative screening level risk assessment. 1.2 SCOPE OF WORK The scope of work implemented to prepare this PEA report included: • Scoping meetings and discussions with DTSC and LUSD representatives, • Researching available background information regarding former and current land use at the Site, • Preparing the PEA Work Plan and addendum, • Implementing field and laboratory data collection and evaluation to assess environmental conditions at the Site, • Performing a screening level human health and ecological risk assessment, and • Preparing this PEA Report. Numerous information sources were reviewed as part of the background research for the Phase I ESA conducted by NOA Environmental [NOA, 2002]. The Phase I ESA was reportedly 1-2 URS CORPORATION PAPEA Loc keford\R eporALocke ford Report Rev.doc