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Remedial Investigation QAPP <br /> Stockton Army Aviation Support Facility,California <br /> Table 17-1 Potential Release Area Surface Soil Sampling Design and Rationale <br /> Area ofinterest Target <br /> /Potential Reference Sample Identifier Number of Sample Sampling Tool Analyte Group Rationale <br /> Release Area Figure Samples Depth <br /> .• <br /> STK-A0101-SS01 STK-A0101-SS01-[start depth]-[end depth] <br /> STK-A0101-SS02 STK-A0101-SS02-[start depth]-[end depth] <br /> STK-A0101-SS03 STK-A0101-SS03-[start depth]-[end depth] <br /> STK-A0101-SS04 STK-A0101-SS04-[start depth]-[end depth] PFAS,Target 40 During the SI, PFOS was detected in groundwater at A0101-01,A0101-03, <br /> Surface Compound List <br /> Stainless Steel A0101-04, and A0101-05 at concentrations in excess of the OSD SL.There <br /> A01 1:Airfield Figure 17-1 STK-A0101-SS05 STK-A0101-SS05-[start depth]-[end depth] 9 0-0.5 Soil Spoon or Hand (EPA Method were exceedances of the OSD SLs for PFOA at A0101-04 and A0101-05 and <br /> Auger 1633) for PFHxS at all five SI sample locations.The proposed sample locations are <br /> STK-A0101-SS06 STK-A0101-SS06-[start depth]-[end depth] intended to locate the source area of a PFAS release in this A01. <br /> STK-A0101-SS07 STK-A0101-SS07-[start depth]-[end depth] <br /> STK-A0101-SS08 STK-A0101-SS08-[start depth]-[end depth] <br /> STK-A0101-SS09 STK-A0101-SS09-[start depth]-[end depth] <br /> STK-A0103-SS01 STK-A0103-SS01-[start depth]-[end depth] <br /> STK-A0103-SS02 STK-A0103-SS02-[start depth]-[end depth] <br /> STK-A0103-SS03 STK-A0103-SS03-[start depth]-[end depth] <br /> A01 3: Butler ,PFAS Target 40 <br /> Stainless Steel During the SI, PFOS was detected in in surface soil at A0103-02 at a <br /> Building Parking Figure 17-1 STK-A0103-SS04 STK-A0103-SS04-[start depth]-[end depth] 7 0-0.5 Surface Spoon or Hand Compound List concentration in excess of the OSD SL.The proposed sample locations are <br /> Fire Training Soil Auger (EPA Method intended to locate the source area of a PFAS release in this A01. <br /> Area 1633) <br /> STK-A0103-SS05 STK-A0103-SS05-[start depth]-[end depth] <br /> STK-A0103-SS06 STK-A0103-SS06-[start depth]-[end depth] <br /> STK-A0103-SS07 STK-A0103-SS07-[start depth]-[end depth] <br /> Total Samples(not including QC) 16 <br /> Notes: <br /> A01 =area of interest PFHxS = perfluorohexane sulfonic acid <br /> bgs= below ground surface PFOS = perfluorohexane sulfonic acid <br /> EPA= Environmental Protection Agency QC = quality control <br /> OSD =Office of the Secretary of Defense SI =Site Inspection <br /> PFAS = per-and polyfluoroalkyl substances SL=screening level <br /> PARSONS Worksheet#17&18:Sampling Design and Rationale <br /> Page 117 <br />