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Site Inspection UFP-QAPP Addendum Stockton AASF, Stockton, California (NTU), stabilizes at a level above 25 NTU, or for a maximum duration of one hour, whichever occurs first. In wells with limited groundwater recharge, the sample will be collected using the available groundwater. In addition to turbidity, other water quality parameters (e.g., temperature, specific conductance, pH, dissolved oxygen [DO], and oxidation-reduction potential [ORP]) will be measured and recorded on the field sampling form every 5 minutes until the above turbidity criteria are met. Water quality parameters will be measured using a water quality meter and flow-through cell (see SOP 3-14: Monitoring Well Sampling and SOP 3-24: Water Quality Parameter Testing for more details). In addition, a subsample of each groundwater sample will be collected in a separate container and undergo a shaker test to identify if there is any foaming. If foaming is observed, the observation will be noted on the CoC to notify the laboratory of potentially high PFAS concentrations in the sample prior to analysis. Any non -dedicated sampling materials will be decontaminated between boring locations. Each sample will be collected into laboratory -supplied bottleware and submitted to the laboratory for analysis of selected parameters (PFAS by LC/MS/MS compliant with QSM 5.3 Table B-15) (DoD, 2019a) as per SOP 3-41. The laboratory method DLs for these analytes are presented in Worksheet #15. QC samples will be collected in accordance with Worksheet #20. ERBs will not be prepared or analyzed unless a deviation from this plan requires sample handling using non- dedicated equipment. If non -dedicated sampling equipment is used, ERBs will be collected at a rate of one per twenty samples and will be analyzed for the same analytes as the associated samples. All sample containers will be PFAS free and the aqueous samples will not be filtered. Samples will be packaged on ice and transported daily via overnight commercial carrier under standard CoC procedures to the laboratory (SOP 3-04). Temporary wells will be abandoned using bentonite chips at completion of sampling activities. QAPP Worksheet #17d Sampling Design and Rationale Synoptic Water Level Measurements Groundwater levels will be used to assess groundwater flow. Synoptic water level elevation measurements will be collected from existing monitoring wells located on CAARNG property adjacent to the west of the AASF. QAPP Worksheet #17e Sampling Design and Rationale Surveying A small notch will be cut on the northern side of the well casing which will be surveyed by a state - licensed surveyor (see SOP 3-07). The top of casing and ground surface elevation will be surveyed for each newly installed well. Survey data will be collected in the applicable Universal Transverse Mercator zone projection with WGS84 datum (horizontal) and North American Vertical Datum 1988 (vertical). QAPP Worksheet #17f Sampling Design and Rationale Investigation -Derived Waste Management Currently, the disposal of PFAS investigation -derived waste (IDW) is not regulated. As such, the IDW will be managed as follows. AECOM QAPP Worksheet #17 Page 7 of 10