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737 <br />738 <br />739 <br />740 <br />741 <br />742 <br />743 <br />744 <br />745 <br />746 <br />747 <br />748 <br />749 <br />750 <br />751 <br />752 <br />753 <br />754 <br />755 <br />756 <br />Site Inspection UFP-QAPP Addendum <br />Stockton AASF, Stockton, California <br />• Worksheet #17e - Investigation -Derived Waste Management <br />Table 17-1: Site Inspection Sample Count <br />Notes: <br />1) All samples will be analyzed for PFAS. <br />2) One soil sample per AOI will be analyzed for pH and TOC from a location in the source area. Grain size analysis will be performed in up to <br />one soil sample per AOI where extensive horizontal and vertical clay units are identified by the field geologist, if these conditions are <br />encountered in the field. <br />AOI = area of interest <br />bgs = below ground surface <br />DPT = direct push technology <br />HA = hand auger <br />QC = quality control <br />QAPP Worksheet #17a <br />Sampling Design and Rationale <br />Mobilization <br />Site Preparation <br />The site preparation activities for the SI field investigation operations include mobilization of field <br />team personnel and equipment. No vegetation clearance is planned during field investigation <br />activities. <br />757 PFAS Site Water Supply Samalina and Samolina Eauiament Accentabilit <br />758 A sample from the potable water source (i.e., decontamination water) will be collected prior to <br />759 mobilization to confirm that it is acceptable for use for during field activities (i.e., equipment <br />760 decontamination). The water source is acceptable for use if the detected concentration is less <br />761 than 1/5 the SL. If the decontamination water has concentrations greater than 1/5 the SL, the <br />762 project team will determine whether the water is acceptable for its intended use based on site - <br />763 specific factors (i.e., drilling methodology, relevant sample media). If the water is deemed <br />764 unacceptable, water will be brought onsite from another source confirmed to be PFAS-free <br />765 through sampling. Quality control (QC) samples will not be collected for the decontamination <br />766 water sample. <br />767 All materials being purchased or rented for field work will be confirmed as acceptable for use in <br />768 the PFAS sampling environment. A summary of acceptability of materials for use in the PFAS <br />769 sampling environment is provided in SOP 3-41 (Appendix B). As an additional layer of control, <br />770 prior to the start of field work each day, a PFAS Sampling Checklist will be completed (SOP 3-41, <br />771 Appendix B). The checklist will serve as a reminder to each field team member regarding the <br />772 allowable materials within the sampling environment. An example of the checklist is provided <br />773 below. <br />AECOM QAPP Worksheet #17 <br />Page 2 of 10 <br />