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Phase II Sampling and Analysis Plan SOP-2—Drilling and Sampling Port of Stockton-Rail and Bridge,Stockton,CA FN • The only acceptable drilling fluid to be used while advancing the borehole is water. However, water will be used only when necessary as approved by the FTL and will be from a potable water source. Water will not be used when drilling boreholes where soils for PFAS analysis are to be collected. • During drilling of boreholes with DPT, soil cores will be collected continuously in 4-foot sections in clear plastic liners. When sampling for PFAS, soil cores must be collected in verified PFAS-free PVC liners, as other liner materials are prohibited when sampling for PFAS (see Section 6.2.3.5) • During drilling of boreholes via HSA, borings will be advanced no further than 3 feet bgs. • The HDR geologist/engineer will maintain visual and verbal communication with the onsite subcontracted driller in order to maintain awareness of any changes in subsurface conditions, amount of water used (if any) during drilling, quantities of materials used during drilling and well installation, or any mechanical problems with the drill rig or support equipment. • The HDR geologist/engineer will carefully and thoroughly complete all required field documentation in order to provide a complete record of drilling activities, including drill rig maintenance and repairs, subcontractor down time, subsurface conditions and geologic materials encountered. The HDR geologist/engineer will determine and record the depth to groundwater observed during drilling. • When the HDR geologist/engineer is finished with visual logging and sampling soil core, the drilling subcontractor will place the core in an approved container for disposal of soil cuttings. • The HDR geologist/engineer will monitor the breathing zone for organic vapors in accordance with the procedures contained in the HASP. The tops of the boreholes will be monitored for organic vapors using a PID. • The HDR geologist/engineer will collect soil samples at specified intervals in borings for soil classification and/or chemical analysis or field screening as specified in the project-specific work plan. • Drilling equipment will be decontaminated prior to drilling activities in accordance with SOP 5 Equipment Decontamination. • Investigative-derived waste (i.e., drill cuttings, wastewater)will be characterized and disposed as specified in the project work plan. • The HDR geologist/engineer will communicate with the FTL regarding site conditions and out of scope work to be performed. 6.2.3.1 DPT and HSA Drilling DPT drilling will be used for any borings terminating at 10 ft bgs or greater. DPT drilling is performed for the purpose of soil, groundwater and soil vapor sampling using the Geoprobe dual tube system. The dual tube system uses a 2.25-inch outer diameter(OD) drive rod and cutting shoe attached to 2-7