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TABLE 1 �\ SUMMARY OF POST-REMOVAL SOIL SAMPLING ANALYTICAL RESULTS KLE/NFELOER Costco Wholesale Warehouse No.658 3250 West Grant Line Road Tracy,California 95377 Total VOCs Purgable Petroleum Total Fuel Other Total Hydrocarbons' Benzene Toluene Ethylbenzene Xylenes Oxygenates VOCs Lead Date of (mg/kg) (mg/kg) (mglkg) (mglkg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) Sample Name Sample Location Sampling 8260B 8260B 8260B 8260B 8260B 8260B 82608 6010B D-1 Dispenser 6/17/2022 ND ND ND ND ND ND ND 7.3 D-2 I Dispenser 6/17/2022 ND ND ND ND NO NO ND 6.5 D-3 Dispenser 6/17/2022 ND ND ND I NO ND NO I ND 7.1 D-4 Dispenser 6/17/2022 ND ND NO NO NO NO ND 6.9 D-5 Dispenser 6/17/2022 NO ND NO NO NO NO NO 6.7 D-6 Dispenser 6/172022 NO ND NO ND NO NO NO 6.8 P-1 Piping Trench 6/17/2022 ND ND ND ND ND NO ND 5.8 P-2 Piping Trench 6/172022 NO ND ND NO NO NO NO 6.6 P-3 Piping Trench 6/17/2022 ND NO ND ND NO NO ND 6.6 P-4 Piping Trench 6/17/2022 NO NO ND NO NO NO ND 6.8 P-5 Pi ing Trench 6/17/2022 NO NO ND ND ND ND ND 7.0 P-6 Piping Trench 6/30/2022 ND NO NO ND ND ND ND 7.6 J A10 P-7 Piping Trench 6/30/2022 NO NO ND ND NO NO ND 8.2 J A10 SP-1 Stockpile 6/172022 NO NO NO NO ND ND ND 4.5 SP-2 Stockpile 6/172022 NO ND NO ND NO NO ND 4.3 Tier 1 ESLI 100 0.025 3.2 0.43 2.1 Vary or NV Vary or NV 32 Notes: ' Equivalent to gasoline-range total petroleum hydrocarbons. 8260B/6010B United States Environmental Protection Agency(US EPA)analytical method number. mg/kg Milligrams per kilogram. NO Not present at a concentration at or above the laboratory's practical quantitation limit(which varies by analyte and sample). J Laboratory qualifier indicating result is an estimated value. A10 Laboratory qualifier indicating detection and quantitation limits were raised due to matrix interference. ESL San Francisco Bay Regional Water Quality Control Board(SFBRWQCB)Environmental Screening Level(July 2019). NV No ESL value. 20224378.001A/LH22R143097 Page 1 of 1 July 25,2022 Copyright 2022 Meinfelder