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Appendix A-Sampling and Analysis Plan BSK Project E19-016-01F Stockton Metropolitan Airport(SCK) March 1, 2023 Stockton, California Page 6 4.3 Sampling Collection and Storage Prior to sampling, hands will be well washed. Clean powderless nitrile gloves will be used before handling any sampling equipment and sample containers; and collecting samples. The sample container will be kept sealed and only opened during sample collection. Sample container caps or lid will never be placed on the ground or any other surface unless it is PFAS-free. Sample containers will be labeled with identification information including the sample location name, date and time of the sample collection, and sampling personnel initials. Ballpoint pens will be used for labeling sample containers. The filled sample containers will be doubled bagged using resealable bags provided by the laboratory prior to placing samples into a cooled ice chest with bagged wet ice. Samples must be chilled during storage and delivered to the laboratory within 48 hours after collection. Sample temperature must not exceed 50°F. Whenever possible, samples will be transported under COC protocol within 48 hours of collection to BSK Analytical Laboratories, a California National Environmental Laboratory Accreditation Program (NELAP) certified analytical laboratory. The following additional considerations must be observed during sample collection to prevent PFAS introduction: • Regular/thick size markers such as Sharpie° are not allowed. • Do not use sticky notes such as Post-it Notes', plastic clipboards,or waterproof paper notebooks. • If ballpoint pens do not write on the sample container labels, preprinted labels from the laboratory may be used. • Chemical or blue ice should not be used. 4.3.1.Potable Water Sampling Potable water sample will be collected directly from the discharge port into the designated sample container. Prior to sample collection, the discharge port will be allowed to flush for approximately 5 minutes to reduce impact from local PFAS sources such as Teflon°tape and resilient valves sets;and water quality parameters of temperature, pH, and electrical conductivity stabilized to within +/-0.1 for pH and +/-3%for EC. A blank well sample log is presented in Appendix A-A. Well sample logs will be prepared for each water sample. 4.3.2.SoiI Sampling Soil borings will be advanced to the determined depths by a C-57 licensed drilling subcontractor or by hand auger. Due to the presence of utilities and history of military uses at the Site, each boring will be hand augered to a depth of 5 feet or air-knifed for the first 10 feet(ft) below ground surface (bgs)to allow for the exposure of potential buried utilities and objects prior to drilling. Depths greater than 10 ft boring will be advanced using hollow-stem auger(HSA) or Direct Push Technology (DPT) drilling methods. ,y a