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Revised Workplan-Additional Site Investigation for PFAS BSK Project E20-016-01F <br /> Stockton Metropolitan Airport(SCK) March 1, 2023 <br /> Stockton, California Page 11 <br /> 3. Immediately following the advancement of DPT borings, BSK and a drilling subcontractor will <br /> advance four (4) monitoring wells within the vicinity of PRA 1, PRA 2 and PRA 3. The monitoring <br /> wells will be installed with respect to anticipated gradient flow (east-northeast)lunderneath the <br /> SCK property.Soil samples for chemical analysis will be collected in each of the four(4) monitoring <br /> well borings at 1 ft, 5 ft and 10 ft bgs for additional characterization of PFAS in soil. Additionally, <br /> soil samples will be collected in three (3) monitoring well borings (e.g., MW-2, MW-3 and MW-4) <br /> within the capillary fringe (approximately 40 ft bgs)to characterize PFAS in the capillary fringe. <br /> 4. Once the wells have been installed, they will be developed, purged and sampled for chemical <br /> analysis. The wells will also be surveyed by a licensed surveyor. <br /> 5. Summarize information regarding the storm drain network provided by the airport, including <br /> stormwater flow direction, and any stormwater retention and/or treatment system available to <br /> SCK.This would be completed to evaluate if PFAS are being transported off SCK property. Please <br /> note that SCK is performing a drainage study in late 2022 to early 2023 which should aid in this <br /> summary. <br /> 1 Historical groundwater flow information is available under Case Number T0607700159 in GeoTracker <br /> (KM C554e-20140613134325(ca.gov)) <br />