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ARCADIS The following sections describe the recognized environmental concerns, sampling strategy, rationale, investigative methods and procedures, sampling and analysis program, sample handling, decontamination procedures, and management of investigation-derived wastes. 3.1 Recognized Environmental Concerns The objective and scope of the PEA Work Plan are stated in Section 1.1 of this PEA Work Plan. Background information for the Site is presented in Section 2.0. The following potential source of chemical contamination has been identified at the Site: Historical and current chemical storage and repackaging activities. Releases and spills from on-site chemical storage containers may have affected shallow soils. In accordance with the DTSC PEA Guidance Manual (DTSC 1999), a screening-level evaluation will be conducted to provide an estimate of potential chronic (long-term) health risks from soil at the Site. Analytical data from the PEA field investigation will be used for this evaluation. In accordance with the DTSC PEA Guidance Manual, land use of the Site was assumed to be residential, regardless of the current or proposed future site use. Complete exposure pathways included (1) inhalation of airborne dust, (2) ingestion of site soil, and (3) dermal absorption from direct contact with soil. A conceptual site model is presented on Figure 3. Exposure to water was not considered in the evaluation. Potable and non-potable water for the proposed redevelopment of the Site is expected to be supplied by the local municipality water utility system. 3.2 Sampling Strategy, Rationale, and Approach Engineering or geologic work, performed as a portion of the PEA, will be performed or supervised by a professional geologist (P.G.) in compliance with the requirements of the Professional Engineers Act, Business and Professions Code Sections 6700-6899 and Section 7838, and the Geologist and Geophysicists Act, Business and Professions Code Sections 7800-7887. The PEA field investigation will consist of soil sampling to assess environmental conditions at the Site. Surface samples (0 to 0.5 foot bgs) and subsurface samples (1.5 to 2.0 and 4.5 to 5.0 feet bgs) will be collected. A site reconnaissance was conducted by ARCADIS and DTSC on April 14, 2010. The Site is currently abandoned. Structures located on-site include an abandoned residence, a barn, a few sheds, a domestic well, a pump house, and a silo. Tall grass and weeds cover the majority of the surface of the Site. Portable storage containers formerly used wp-PEA-Gordon-1u110-RV009808.doc: Page 15