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Remedial Investigation QAPP Stockton Army Aviation Support Facility,California 14.2 Field Investigation Activities The following subsections present field tasks that may be completed as part of the RI field efforts. Field tasks will be completed following the Parsons SOPs listed in Worksheet#21 and provided in Appendix D. In instances where deviations from the field protocols established in the Worksheet are made due to unforeseen conditions, a Field Change Request Form will be generated to document the change and will request feedback from the Parsons RI Task Leader and PM, USACE, and ARNG. 14.2.1 Field Instrument/Equipment Selection, Calibration, and Quality Control Materials being purchased or rented for field work will be confirmed as acceptable for use in the PFAS sampling environment. A summary of acceptability of materials for use in the PFAS sampling environment is provided in Parsons SOP PFAS ENV-01:PFAS Sampling Guidance(Appendix D).As an additional layer of control, prior to the start of field work each day,a PFAS Sampling Checklist will be completed.The checklist will serve as a reminder to each field team member regarding the allowable materials within the sampling environment. An example of the checklist is included in the Parsons SOP. Equipment will be checked to ensure its completeness and operational readiness. Any equipment found damaged or defective will be returned to the point of origin,and a replacement will be secured. Instruments and equipment that require routine maintenance and/or calibration will be checked initially upon arrival and then prior to use each day, if needed,to support that day's operations. Equipment calibration and daily checks will be documented in accordance with appropriate Parsons SOPs. This system of checks ensures that the equipment is functioning properly. If an equipment check indicates that any piece of equipment is not operating properly,and field repair cannot be made,the equipment will be tagged and removed from service, and a request for replacement equipment will be placed immediately. Replacement equipment will meet the same specifications for accuracy and precision as the equipment removed from service. 14.2.2 Potential Release Area Surface Soil Sample Collection Surface soil samples will be collected for three purposes: 1) in the vicinity of known release area A01 1 to ensure contamination identified during the SI has been delineated, 2) in the vicinity of A01 3 to ensure contamination identified during the SI has been delineated, and 3) to assist in identifying whether additional subsurface samplingshould be performed during Mobilization 2 to further delineate soil contamination.Surface soil samples will be collected as discrete samples from 0 to 0.5 ft bgs using hand tools. Utility clearances will not be required for these locations due to the shallow sample interval, and use of hand tools for sample collection. Refer to Worksheets #17 & #18 for additional details on the sample design, location, and rationale. All sampling materials will be PFAS-free. Each soil sample will be collected into laboratory-supplied bottleware and submitted to the laboratory for analysis. The laboratory method DLs for the sampled analytes are presented in Worksheet #15. The required sample containers,preservatives,and holding times are specified in Worksheets#19&#30. Refer to Parsons SOP PFAS ENV-02:Soil Sampling(Appendix D)for additional details. Surface soil sample locations will be marked with a pin flag, stake, or white board with sample identification number, photo-documented,and recorded with a hand-held global positioning system(GPS).The surface at each sampling location will be restored to match the surrounding area. PARSONS Worksheet#14&16: Project Tasks and Schedule Page 64