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Remedial Investigation QAPP Stockton Army Aviation Support Facility,California Table 17-4 Groundwater Monitoring Well Installation/Sampling Design and Rationale Area of Interest/ Referen Location Well Target Screen Interval wl� Slug NumberPotential ce EN •- •• SamplesSample Identifier Of Analyte Group Rationale Release Figure Area Across the water table Shallow Evaluate groundwater at the northwest point of the [MMDDYY] MW 01S YY] STK-MW-01 STK Proposed (depth to water observed at X X [ 0] 4 Facility boundary at A01 3 and improve groundwater 37-42 during SI) [MMDD flow delineation. Across the water table Shallow Evaluate groundwater at the southwest corner of A01 [MMDDYY] MW 02S YY] STK-MW-02 STK Proposed (depth to water observed at X X [ 0] 4 3 and Facility boundary and improve groundwater 37-42 during SI) [MMDD flow delineation. Across the water table Shallow Evaluate groundwater downgradient of A01 3 at the [MMDDYY] MW 03S YY] STK-MW-03 STK Proposed (depth to water observed at X X [ 0] 4 Facility boundary and improve groundwater flow 37-42 during SI) [MMDD delineation. Across the water table Shallow Evaluate groundwater at A01 2 and the southwest [MMDDYY] MW 04S YY] STK-MW-04 STK Proposed (depth to water observed at X X [ 0] 4 Facility boundary and improve groundwater flow 37-42 during SI) [MMDD delineation. Across the water table Shallow STK- STK-MW05S- PFAS,Target 40 Evaluate groundwater at the southwest corner of A01 STK-MW-05 MW-05S Proposed (depth to water observed at X X [MMDDYY] 4 Compound List 1 and improve groundwater flow delineation. 37-42 during SI) (EPA Method Across the water table Shallow STK- STK-MW06S- 1633) Evaluate groundwater at the northwest corner of A01 STK-MW-06 MW-06S Proposed (depth to water observed at X X [MMDDYY] 4 1 and improve groundwater flow delineation. 37-42 during SI) A01 1, Shallow With a subset of: Evaluate groundwater adjacent to the Facility Figure Across the water table Bladder TSS(EPA Method A01 2, STK- STK-MW07S- Groundwater boundary, north of A01 1; investigate potential off- and17-2 STK-MW-07 Proposed (depth to water observed at X X 4 Pump SM2540D),TDS A01 3 MW-07S 37-42 during SI) [MMDDYY] (EPA Method Facility non-DoD source; improve groundwater flow STK- Proposed TOC delineation. Across the water table Shallow Evaluate groundwater at A01 1 and improve STK-MW08S- (EPA Method STK MW 08 MW-08S Proposed (depth to water observed at X X [MMDDYY] 4 SW9060A), pH groundwater flow delineation. 37-42 during SI) (EPA Method Across the water table Shallow 9040C) Evaluate groundwater downgradient of A01 1 at the STK 37-42 during SI) STK-MW09S northeast Facility boundary, investigate potential off- STK MW 09 MW-09S Proposed (depth to water observed at X X [MMDDYY] 4 Facility non-DoD source, and improve groundwater flow delineation. Across the water table Shallow Evaluate groundwater adjacent to A01 land the [MMDDYY] MW 10S YY] STK-MW-10 STK Proposed (depth to water observed at X X [ ] 4 southern Facility boundary and improve groundwater 37-42 during SI) [MMDD flow delineation Across the water table Shallow Evaluate groundwater at the most southeastern [MMDDYY] MW 11S YY]] STK-MW-11 STK Proposed (depth to water observed at X X [ 4 Facility boundary, improve groundwater flow 37-42 during SI) [MMDD delineation. Across the water table Shallow Evaluate groundwater flow at the most northeastern STK 37-42 during SI)) STK-MW12S Facility boundary, investigate potential off-Facility STK MW 12 MW-12S Proposed (depth to water observed at X X [MMDDYY] 4 non-DoD source, and improve groundwater flow delineation. Total 12 12 Total Samples 48 (not including QC) Notes: A01 =area of interest EPA= Environmental Protection Agency PFAS= per-and polyfluoroalkyl QC=quality control TOC =total organic compounds bgs= below ground surface MW= monitoring well substances TDS =total dissolved solids TSS=total suspended solids PARSONS Worksheet#17&18:Sampling Design and Rationale Page 120