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r <br /> Table 3 <br /> RBCA Tier I Analysis <br /> Offsite Receptors <br /> Exposure Otl'ske Target Benzene Toluene Ethylbenzene Xylenes MTBE <br /> Pathway Receptor Risk (RBSLCOPC) (RBSIICOPC) (RBSLCOPC) (RBSLCOPC) (RBSIXOPQ <br /> Scenario Level <br /> Groundwater Residential 1x 10-6 3 1/00017 <br /> volatilization Receptor at <br /> to outdoor air Apartment HQ=i >Sol/<O 0005 >Sol/<O 0005 >Sol/<0 0005 >Sol/0 0013 <br /> Building <br /> Groundwater Residential 1 x 10-6 0007/00017 <br /> volatilization Receptor at <br /> to indoor air Apartment HQ=1 331<O 0005 77I<O 0005 >Soll<O 0005 870/00013 <br /> Building <br /> Groundwater Residential lx 10-6 0 5010 013 <br /> ingestion Exposure at <br /> Nearest <br /> Agricultural/ >Sol/O 022 >Sol/O 0074 >Sol/O 038 2 8*10 056 <br /> Irrigation HQ=I <br /> Well <br /> All concentrations in ppm <br /> * RBSL based on odor and taste threshold of 5 ppb <br /> >Sol=Selected risk level is not exceeded for all possible dissolved levels <br /> COPC=Chemical of potential concern offstte source concentration <br /> RBSL=Tier I risk-based screening level <br /> NA=Not Applicable <br /> HQ=Hazard quotient <br /> ,r <br /> �^ <br />