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Remedial Investigation QAPP Stockton Army Aviation Support Facility,California be collected from a single point in the waterbody by dipping the sample container in the water, approximately from the depth midpoint of the water column. Sampling will be performed deliberately and methodically to minimize disturbance of bottom sediments, and as quickly as possible to ensure a representative sample is collected. After the water sample is collected, water quality parameters, including ORP, pH, SC, salinity, temperature, DO, and turbidity,will be measured with a water quality meter and recorded in the field logbook or sampling form. Physical characteristics of the sampling locations (e.g., water depth and stream width) will be documented. Additionally, at each location, the depth of water and width of channel or conveyance feature will be recorded, and a photograph will be taken. Refer to Parsons SOP PFAS ENV-04:Surface Water and Sediment Sampling(Appendix D)for additional details. If co-located with a water sample, soil samples will be collected after water sampling is complete. Soil samples will be collected from 0 to 0.5 feet bgs using a hand-driven coring barrel or stainless-steel spoon.The sediment solids will be transferred to a PFAS-free container(i.e., 1-gallon Ziploc®bags)from which material,such as twigs, leaves, and stones, will be removed prior to homogenization and documented in the field log or field forms. Sediment samples will target fine-grained material from depositional areas. Refer to PFAS ENV-04: Surface Water and Sediment Sampling (Appendix D) for additional details. The surface water dipper, sediment/stormwater-transported solids coring device,and water quality probe will be stainless steel or another PFAS-free material. Each sample will be collected into laboratory-supplied bottleware and submitted to the laboratory for analysis of selected parameters.Sample containers will be PFAS-free,and the aqueous samples will not be filtered.Surface water and sediment samples will be analyzed under standard TAT for the target list of 40 PFAS (USEPA Method 1633).Additionally, 10%of sediment samples will be analyzed for TOC(USEPA Method 9060A)and pH (USEPA Method 9045D).The laboratory method DLs for these analytes are presented in Worksheet#15. The required sample containers, preservatives, and holding times are specified in Worksheets#19&#30. 14.2.11 Synoptic Groundwater Level Measurements Synoptic groundwater level measurements will be collected from existing and newly installed permanent groundwater monitoring wells. Synoptic groundwater level measurements from newly installed wells will be collected a minimum of 24 hours after completion of well development. The specific locations of groundwater and surface water level measurements are specified in Worksheets#17&#18. The synoptic groundwater gauging round will be conducted within as short a time period as reasonably feasible and will follow a period of little to no precipitation.The water level gauging event will be conducted on a day when little to no precipitation is forecasted. 14.2.12 Field Quality Control Samples Field QC samples will include field duplicates (FDs), matrix spike (MS)/MS duplicates (MSDs), field reagent blanks (FRBs), and temperature blanks. Worksheet #20 defines quality control samples. FD samples will be collected at a rate of 10% and analyzed for the same parameters as the accompanying samples. MS/MSD samples will be collected atthe rate of 5%and analyzed for the same parameters as the accompanying samples. FRBs will be collected at a rate of one per sampling event for groundwater, soil, surface water, and sediment media, or one per day or one per 10 samples(whichever is more)for potable well samples. A temperature blank shall be placed in each cooler to ensure that samples are preserved between 0 and 6 °C during shipment. If non-dedicated sampling equipment is used, an equipment blank will be collected at a rate of 5%and analyzed for the same parameters as the accompanying samples. PARSONS Worksheet#14&16: Project Tasks and Schedule Page 70