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PARTNER Engineering and Science, Inc: October 2, 2025 San Joaquin County Environmental Health Department 1868 East Hazelton Avenue Stockton, California 95205 Subject: Soil Gas Sampling Workplan 601 North Central Avenue Tracy, California 95376 Partner Project Number ES22-353833 To Whom it May Concern: Partner Engineering and Science, Inc. (Partner) on behalf of CRP Affordable Housing &Community Development, has prepared this Soil Gas Sampling Workplan (Workplan) for the property located at 601 North Central Avenue, Tracy, California (herein after referred to as the "Site"), for the San Joaquin County Environmental Health Department (SJCEHD) review and approval. Please refer to Figure 1 for a Site Plan of the Site. Purpose The purpose of the soil gas sampling is to evaluate the potential impact of volatile organic compounds (VOCs) to soil gas at the Site as a consequence of a release or releases from the Tidewater Association Oil Company (TAOC) pipeline cleanup site located south of the Site. Scope of Work The proposed scope of the project is to advance five borings to facilitate the collection and analysis of soil gas samples. The proposed boring locations are shown on Figure 1. The sample analysis will be performed by State-certified laboratories and the work will be performed under the responsible charge of a California registered Professional Civil Engineer or California registered Professional Geologist in conformance with the common requirements of the SJCEHD, Department of Toxic Substances Control (DTSC) and the United States Environmental Protection Agency (EPA). Partner will perform the following tasks for the soil gas sampling scope of work: • Secure the necessary Boring Permit from the SJCEHD; • Prepare a Site-specific health and safety plan;