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Phase II Sampling and Analysis Plan SOP-2—Drilling and Sampling Port of Stockton-Rail and Bridge,Stockton,CA FN 6.2.3.5 Soil Sample Collection for PFAS Sampling equipment can be a source of PFAS contamination. To the extent practicable, rinse parts of equipment coming in direct contact with samples with PFAS-free water(such as laboratory provided PFAS-free water or distilled water) prior to use. Liners used during DPT drilling to collect samples for PFAS must be verified PFAS-free and made from PVC. Table 6.2.3.5 outlines prohibited sampling materials during PFAS sample collection and handling. Table 6.2.3.5. Prohibited sampling materials for PFAS Sampling 110066000 NOW" Polytetrafluoroethylene Teflon®and Hostaflon® Ball check-valves on certain bailers, lining some (PFTE) hoses and tubing,wiring, certain kinds of gears, lubricant, and some object that require the sliding action of parts Polyvinylidene fluoride Kynar® Tubing,films/coatings on aluminum, galvanized (PVDF) or aluminized steel,wire insulators, and lithium- ion batteries Ethylene-tetrafluroro- Tefzel® Wire and cable insulation and covers,films for ethylene(ETFE) roofing and siding, liners in pipes, and some cable ties Fluorinated ethylene Teflon®FEP and Hostaflon®FEP, Wire and cable insulation and covers, pipe propylene (FEP) and may also include Neoflon® linings, and some labware 6.2.3.6 Grab Groundwater Sample Collection for Laboratory Analysis The procedure for collection of grab groundwater samples are as follows: • the DPT drive rod will be advanced approximately 5 feet below first encountered groundwater. • A new 3/4-inch inside diameter polyvinyl chloride (PVC) slotted screen and casing will be lowered to the bottom of the boring and the DPT rod retracted approximately 5 feet to allow groundwater into the screen interval. New polyethylene tubing will be lowered through the PVC casing to approximately 1-foot from the bottom of the boring. • A peristaltic pump will be used to pump the groundwater into laboratory supplied containers. 6.3 Soil Boring Backfill Soil borings will be backfilled by first removing tooling and temporary casing. Bentonite pellets will be poured into the boring to approximately 6-inches below ground surface and hydrated with potable water. Alternatively, cement grout will be used to backfill the borehole to within 6-inches of the ground surface. If groundwater is present, a tremie will be used. Borehole backfilling will be consistent with applicable guidance and regulations. The remaining 6-inches of the boring will be restored to match predrilling conditions (soil, gravel, asphalt, concrete, etc.). 2-10