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5.2 Laboratory Records The samples collected at the Site will be analyzed at State of California certified laboratories. The analytical laboratories analyzing samples from the Site will be responsible for maintaining their own internal QA/QC program. Information in the data report packages provided by the analytical laboratories will include: • Documentation that QA/QC procedures were met and/or any deviations that occurred as well as other pertinent information; • Laboratory QA/QC reports documenting QA/QC sample information including blanks, spiked samples, calibration check samples, laboratory duplicates, and/or split samples; and • Records of sample receipt, handling and storage. 6.0 SAMPLE HANDLING AND CUSTODY REQUIREMENTS The soil and groundwater sampling procedures to be utilized during the Site investigation will be performed in accordance with the QA/QC procedures outlined in the DTSC's Preliminary Endangerment Assessment Guidance Manual,January 1994 (Interim Final—Revised October 2013). The groundwater sampling procedures to be utilized during the site investigation will be performed in accordance with the QA/QC procedures outlined in the DTSC's June 2012 Guidelines for Planning and Implementing Groundwater Characterization of Contaminated Sites. Soil gas samples will be collected in general accordance with the July 2015 DTSC and Los Angeles and San Francisco Regional Water Quality Control Boards (LARWQCB — SFRWQCB) Advisory — Active Soil Gas Investigations. Chain-of-custody procedures will be used to document the collection of soil, soil vapor, and groundwater samples through their final disposition. Chain-of-custody forms document the date and time of collection, location, sample identification, analyses required and track the sample from the field through transfer to the analytical laboratory. Internal custody procedures at the laboratory document the tracking of samples throughout the preparation, analysis, storage and/or disposal of samples and extracts. 6.1 Sample Packaging The collected soil and groundwater samples will be sealed, labeled, and packed on ice in a portable cooler immediately after collection. Sample containers will be packed in zip locked baggier to minimize contact between ice and container, reducing the potential for cross contamination. The cooler will be delivered to the laboratory within 24 hours of sampling. Soil vapor samples will be collected in gas-tight syringes by mobile laboratory personnel or in Summa canisters provided by the analytical laboratory. Quality Assurance/Quality Control Plan Tracy Corners Shopping Center 3225 North Tracy Boulevard Tracy,California 95376 Partner Project Number SM14-129814 Docket Number HAS-VCA 14/15-108 August 15,2016 Page 8