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Table 3-1 Summary of Proposed Sampling Locations and Rationale 3003 Navy Drive,Stockton,CA Location Proposed Proposed Proposed Application/Usage Type Upgradient/ Shallow Soil Location Name Description Description Downgradient Rationale/Proposed Action (based on 2021 Interviews) Background Samples Well Well (1-2 ft deep) U1 West Terminal Foam use area at Foam use at West Terminal truck loading rack.Contained TS-9R,SP-5 TS-1R Sample upgradient,downgradient,and cross-gradient Truck Rack on concrete;collected for offsite disposal. wells Sample upgradient,downgradient,and cross-gradient S1 West Terminal Foam storage area 1000-gallon foam storage tank located southwest of TS-9R,SP-5 TS-1R,TS-4R wells in proximity to and downgradient of the foam truck rack at West Terminal. storage tank.These sample locations create a perimeter around the known storage and release areas Collect one soil sample southeast of 600-gallon foam tank S2 East Annex Foam storage area 600-gallon foam tank at East Annex. 1 off the edge of the concrete pad(i.e.,below gravel covering soil). S3 East Annex Fire monitor with foam Two 55-gallon drums stored at East Annex for use with 1 Collect one soil sample off the south edge of the concrete fire monitor. pad for the two 55-gallon foam drums. Total Sampling Locations 2 2 2 Note:Although proposed wells TS-9R and SP-5 are listed as a downgradient wells with respect to Usage Area U1 and Storage Area S1,TS-911 and SP-5 will only be sampled once.Similarly,well TS-1R is listed as an upgradient well with respect to U1 and S1,however TS-111 will only be sampled once.