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6.2 Field Sample Custody Procedures The FPM is responsible for the implementation and maintenance of sample custody procedures in the field. The chain-of-custody form will be initiated by sampling personnel after the attachment of sample labels to the sampling containers and transcription of sampling information on the daily field log. The samples will be handled in a manner that minimizes the potential for sample tampering, degradation, cross contamination or loss due to chemical or physical actions including photo degradation, volatilization and/or breakage. Physical control over the collected samples may be maintained by: • storing the collected samples within the FPM's immediate possession until transfer to the analytical laboratory; • Storing the collected samples in a locked room with controlled access; and/or • Use of chain-of-custody or other seals that would provide evidence of entry by non-authorized personnel. Transfer of sample custody from the FPM, or their designate, to the analytical laboratories will be documented using the chain-of-custody form. One copy of the chain-of-custody form will be retained by Partner personnel and placed in the project file. 6.3 Sample Identification Labels As stated previously, each sample sent to the analytical laboratory will have an identification label attached to the sample container. The labels will be designed to remain fixed to the sample container and legible even upon wetting. Copies of the sample labels and Chain-of-Custody forms are provided in Appendix Al. 6.4 Laboratory Custody Procedures The designated personnel at the analytical laboratory will sign the chain-of-custody form and indicate the date and time of sample arrival, the number of samples received, and the condition of samples upon their receipt. The samples will be entered into the laboratory's sample custody system which will track the sample until the data package for the sample is generated and delivered. 7.0 QUALITY CONTROL REQUIREMENTS Quality control samples are used to assess the accuracy, precision, and representativeness of field and laboratory procedures. As noted on Table Al, the quality control samples related to field sampling that may be used during this project include blank samples, duplicate samples, and spiked samples. Laboratory quality control samples will be conducted in accordance with each laboratories QC program in conformance with the laboratories ELAP certifications. These samples are described in the following sections. 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 9