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PAIREPORT (June 20,2003) LOCKEFORD ELEMENTARY SCHOOL EXPANSION conducted pursuant to the processes set forth in the American Society for Testing and Materials (ASTM) Standard Practice for ESAs: Phase I ESA Process (ASTM Standard E1527-00), and pursuant to DTSC recommended investigative procedures for assessment of proposed school sites. Supporting documentation, such as the June 20, 2002 environmental records search report, included in the Phase I ESA report was independently reviewed by URS during the preparation of the Work Plan to confirm statements made in the reports. Other information sources were also reviewed by URS such as maps and climatological and hydrogeological reports. This report does not contain all of the background information contained in the Work Plan, and the reader is referred to the Work Plan for this additional information. A sampling and analysis program was conducted to evaluate the potential presence of chemical constituents in soil gas, shallow soils, and groundwater beneath the site. The scope of field and laboratory investigations was presented in the Field Sampling Plan (FSP) included as Section 4.0 of the PEA Work Plan. The field and laboratory program included: • Evaluating the potential presence of volatile organic compounds (VOCs) based on a soil gas survey conducted in accordance with DTSC's Advisory — Active Soil Gas Investigations dated January 13,2003; • Follow up soil matrix sampling and testing for VOCs, depending on soil gas results; • Collection of soil matrix samples from 24 onsite locations at depths of approximately 1/2- foot, 5-feet, and at selected locations 15-feet below ground surface (bgs) and analysis for: o California Code of Regulations (CCR) Title 22 total metals, o Semi-volatile organic compounds (SVOCs) including polycyclic aromatic hydrocarbons (PAHs), o Organochlorine pesticides (OCPs), o Polychlorinated biphenyls (PCBs), and o Total Petroleum Hydrocarbons (TPHs) in the gasoline, diesel, and oil ranges; • Collection of first-encountered groundwater from two locations and analysis for selected chemical constituents; • Collection and analysis of quality assurance/quality control (QA1QC) samples, including field duplicates and equipment rinsate blanks; and • Validation of laboratory data to assure that data quality objectives (DQOs) were met and the data were suitable for use in the human health and ecological screening evaluation. Using the data collected during implementation of the field and analytical program, a screening. level human health and ecological risk assessment was performed following the procedures set forth in DTSC's PEA Guidance Manual and in consultation with the DTSC Staff Toxicologist assigned to the project. In consultation with DTSC and according to the work order issued to URS, no asbestos containing material (ACM) or lead-based paint inspections were conducted for the Site's 1-3 URS CORPORATION PAPEA Lockeford\Report\Lockeford Report Rev.doc