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Site Inspection UFP-QAPP Addendum Stockton AASF, Stockton, California 904 (NTU), stabilizes at a level above 25 NTU, or for a maximum duration of one hour, whichever 905 occurs first. In wells with limited groundwater recharge, the sample will be collected using the 906 available groundwater. 907 In addition to turbidity, other water quality parameters (e.g., temperature, specific conductance, 908 pH, dissolved oxygen [DO], and oxidation-reduction potential [ORP]) will be measured and 909 recorded on the field sampling form every 5 minutes until the above turbidity criteria are met. 910 Water quality parameters will be measured using a water quality meter and flow-through cell (see 911 SOP 3-14: Monitoring Well Sampling and SOP 3-24: Water Quality Parameter Testing for more 912 details). In addition, a subsample of each groundwater sample will be collected in a separate 913 container and undergo a shaker test to identify if there is any foaming. If foaming is observed, the 914 observation will be noted on the CoC to notify the laboratory of potentially high PFAS 915 concentrations in the sample prior to analysis. Any non -dedicated sampling materials will be 916 decontaminated between boring locations. 917 Each sample will be collected into laboratory -supplied bottleware and submitted to the laboratory 918 for analysis of selected parameters (PFAS by LC/MS/MS compliant with QSM 5.3 Table B-15) 919 (DoD, 2019a) as per SOP 3-41. The laboratory method DLs for these analytes are presented in 920 Worksheet #15. QC samples will be collected in accordance with Worksheet #20. ERBs will not 921 be prepared or analyzed unless a deviation from this plan requires sample handling using non - 922 dedicated equipment. If non -dedicated sampling equipment is used, ERBs will be collected at a 923 rate of one per twenty samples and will be analyzed for the same analytes as the associated 924 samples. All sample containers will be PFAS free and the aqueous samples will not be filtered. 925 Samples will be packaged on ice and transported daily via overnight commercial carrier under 926 standard CoC procedures to the laboratory (SOP 3-04). 927 Temporary wells will be abandoned using bentonite chips at completion of sampling activities. 928 QAPP Worksheet #17d 929 Sampling Design and Rationale 930 Synoptic Water Level Measurements 931 Groundwater levels will be used to assess groundwater flow. Synoptic water level elevation 932 measurements will be collected from existing monitoring wells located on CAARNG property adjacent 933 to the west of the AASF. 934 QAPP Worksheet #17e 935 Sampling Design and Rationale 936 Investigation -Derived Waste Management 937 Currently, the disposal of PFAS investigation -derived waste (IDW) is not regulated. As such, the 938 IDW will be managed as follows. 939 940 Soil IDW (i.e., drill cuttings) generated during SI activities will be containerized in properly labeled 941 55 -gallon drums (See SOP 3-05). The containerized IDW will be temporarily stored onsite at a 942 location designated by the CAARNG. This IDW will not be sampled and will assume the PFAS 943 characteristics of the associated soil samples collected from that source location. Based on 944 laboratory results, containerized soil cuttings will be managed and disposed by ARNG, either by 945 offsite disposal or, where PFAS concentrations are below the relevant state criteria, ARNG will 946 distribute the soil on the downgradient side of the associated borehole. ARNG will further 947 coordinate in advance with RWQCB to ensure proper disposal in accordance with state 948 requirements and the Army Guidance for Addressing Releases of PFAS, Q18 (DA, 2018). AECOM QAPP Worksheet #17 Page 7 of 10