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Hess-Dubois Cleaners, Stockton - 4 - 21 March 2023 <br /> Table 1 — February 2023 Soil Gas Petroleum Hydrocarbon Results <br /> (Results in micrograms per cubic meter [ug/m3]) <br /> Helium <br /> Well TPHg B T E X MTBE Naph- 02 <br /> thalene (/o) Shroud/ <br /> Sample <br /> SV-1 Res. On-Site <380 <2.9 8.0 <4.0 7.3 <13 <9.6 1.8 22/<0.092 <br /> SV-2 Res. On-Site <2,200 <17 <41 <23 <46 <78 <57 16 19/<0.094 <br /> SV-3 Com. On-Site <7,700 <60 <71 <82 <164 <68 <400 11 23/<0.094 <br /> SV-4 Com. Off-Site <370 <2.9 <6.9 <4 <8 <13 <9.6 12 18/<0.092 <br /> LTCP Res. No BAZ -- <85 -- <1,100 -- -- <93 <4 -- <br /> Thres- W/ BAZ -- <85K -- <1.1 M -- -- <93K >4 -- <br /> holds' Com. No BAZ -- <280 -- <3,600 -- -- <310 <4 -- <br /> W/ BAZ -- <280K -- <3.6M -- -- <31OK >4 -- <br /> Res. ESL 20K 3.2 10K 37 3,500 360 2.8 -- <br /> Com. ESL 83K 14 44K 1 160 15K 1,600 12 -- -- <br /> TPHg= total petroleum hydrocarbons as gasoline; BTEX= benzene, toluene, ethylbenzene, total <br /> xylenes; MTBE = methyl tert butyl ether; 02= oxygen; LTCP= Low Threat UST Case Closure Policy; <br /> Comm.= commercial; BAZ= bio-attenuation zone; K= thousand; M= million; Res.= residential; Com.= <br /> commercial <br /> ' LTCP Petroleum Vapor Intrusion Scenario 4.2 Thresholds <br /> 2 San Francisco Bay Water Board Subslab/Soil Gas Vapor Intrusion Human Health Risk <br /> Environmental Screening Levels <br /> Table 2 — February 2023 Soil Gas Non-Petroleum Hydrocarbon Results <br /> (Results in ug/m3) <br /> Chloro- cis-1,2- Other Non- <br /> Well form PCE TCE DCE Freon12 Ethanol THE Petroleum <br /> VOCs <br /> SV-1 Res. On-Site <4.5 <6.2 <4.9 <3.6 <4.5 <17 3.4 All ND <br /> SV-2 Res. On-Site <26 6,900 500 <21 71 <100 <16 All ND <br /> SV-3 Com. On-Site <92 110,000 8,600 1,300 <93 <180 <56 All ND <br /> SV-4 Com. Off-Site 1 6.4 1 10 1 <4.9 1 <3.6 1 <4.5 1 28 1 4.2 1 All ND <br /> Res. ESL' 4.1 15 16 280 -- -- -- various <br /> Com. ESL' 18 67 100 1,200 -- -- -- various <br /> PCE= tetrachloroethylene; TCE= trichloroethylene; cis-1,2-DCE= cis-1,2-dichloroethene; THF= <br /> tetrahydrofuran; VOCs= volatile organic compounds; ND= not detected above laboratory <br /> reporting limit; Res.= residential; Com.= commercial <br /> ' San Francisco Bay Water Board Subslab/Soil Gas Vapor Intrusion Human Health Risk <br /> Environmental Screening Levels <br />