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Phase II Subsurface Investigation Workplan <br /> Dollar General <br /> 2150 West Alpine Avenue <br /> Stockton, California 95204 <br /> April 26, 2022 <br /> Page 13 <br /> • Advance five borings in the vicinity of the historical dry cleaning operations to a terminal depth of 15 <br /> feet bgs or groundwater,whichever is shallower, collecting soil samples at 2, 5, 10, and 15 feet bgs and <br /> a grab groundwater sample at the terminal depth; <br /> • Field-screen each soil sample using a photoionization detector (PID); <br /> • Prepare up to 20 soil samples and five groundwater samples for laboratory analysis; <br /> • Install a temporary soil gas probe in each boring at 5 feet bgs. The final screening depth at each <br /> borehole will be adjusted based on the encountered lithology. In general, probes will be screened within <br /> coarser-grained materials and clayey/saturated intervals will be avoided, if possible; <br /> • Purge each probe, then collect and prepare up to five soil gas samples for laboratory analysis using <br /> laboratory-provided, batch-certified SUMMA canisters and flow controllers with a 5- to 10-minute <br /> sample period; <br /> • Analyze each soil gas sample(up to five soil gas samples total)for chlorinated solvents [specifically PCE; <br /> trichloroethylene (TCE); cis-1,2-dichloroethylene (DCE); trans-1,2-DCE; 1,1-DCE; and vinyl chloride] via <br /> EPA Method TO-15; <br /> • Based on field-screening results,analyze one soil sample per boring and each groundwater sample(five <br /> soil samples and five groundwater samples total) for chlorinated solvents via EPA Method 8260; and <br /> • Compare data to applicable screening criteria, and prepare a report summarizing field activities, <br /> methods, and findings. <br /> Signatures of Environmental Professionals <br /> Sincerely, <br /> qJoeangine, PG Lauren inch, GIT <br /> Project Manager Project Geologist <br /> PARTNER 4 O <br />