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• Table 3 • <br /> Maximum Detected Concentrations Compared to CHHSLs <br /> Frontier Transportation <br /> 425 W.Larch Road,Tracy,CA <br /> Maximum Residential CHHSL Residential CHHSL Commercial CHHSL Commercial CHHSL <br /> Maximum with en ineered fill without engineered with engineered fill without engineered fill <br /> (pg/1) <br /> Chemical Concentration Concentration g <br /> (Ppmv) (Pg/9 fl,ll(Pg)1) (pWl) (pg") <br /> Benzene 54 IT5 0.085 0.036 _ 028 0.12 <br /> Toluene 9.5 36.3 320 140 890 380 <br /> Ethylbenzene 0.11 0.48 11 0.42 3-6 1A <br /> Xylenes 1.1 0.06 800 320 2200 880 <br /> MTBE 44 160.6 8.6 4.0 29 13 <br /> Notes: <br /> ppmv=Parts per million by volume <br /> pg/I=Microgram per liter <br /> CHHSL=Califomia Human Health Screening Level(2010) <br /> MTBE=Methyl tertiary butyl ether <br /> BTEX= Benzene,toluene,ethylbenzene and xylenes <br /> A MotaYb�.Mc. <br />