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f <br /> Table 2 <br /> RBCA Tier I Analysis <br /> Onsite Receptors <br /> Exposure Onsite Target Benzene Toluene Ethylbenzene Xylenes MTBE <br /> Pathway Receptor Risk (RBSIICOPC) (RBSUCOPC) (RBSUCOPC) (RBSUCOPC) (RBSUCOPC) <br /> Scenario Level <br /> Soil Commercial/ <br /> volatilization Industrial lx 10.6 101<O 002 <br /> to outdoor air Receptor <br /> HQ--1 >RES/<O 002 >RES/<0 002 >RES/0 569 >RES/<O O1 <br /> Soil Commercial/ Ix 10-6 0 023/<O 002 <br /> volatilization Industrial <br /> to indoor air Receptor HQ=1 93/<O 002 >RES/<O 002 >RES/0 569 4601<O O1 <br /> Groundwater Commercial/ Ix 10' 5 3/0013 <br /> volatilization Industrial <br /> to outdoor air Receptor HQ=1 >Sol/O 022 >Sol/O 0074 >SoUO 038 >Sol/O 190 <br /> Groundwater Commercial/ lx 10-6 0 021/0 013 <br /> volatilization Industrial <br /> to indoor air Receptor HQ=1 85/0022 >Sol/O 0074 >Sol/O 038 270010 190 <br /> Direct Construction Ix 10-6 24/<O 002 <br /> exposure to Worker <br /> soils Receptor HQ=1 >RES/<0 002 >RES/<O 002 >RES/0 569 2401<O 01 <br /> All concentrations in ppm <br /> >RES=Selected risk level is not exceeded for pure compound present at any concentration <br /> >Sol=Selected risk level is not exceeded for all possible dissolved levels <br /> COPC=Chemical of potential concern onsite source concentration <br /> RBSL=Tier I risk-based screening level <br /> NA=Not Applicable <br /> HQ=Hazard quotient <br />