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r <br /> TABLE 7 <br /> Comparison of Site-Specific Concentrations to <br /> Tier 9 Risk-Based Screening Levels (RBSLs) <br /> (Cancer Risk= 1 in a million Chronic HQ= 1) <br /> Jackpot Food Mart <br /> 1 14000 East Highway 88 Lockeford, California <br /> GROUNDWATER <br /> Groundwater Benzene Toluene Ethyl- Xylenes MTBE <br /> J Exposure (uglL) (ug1L) (uglL) (ug1L) <br /> Pathway Receptor RBSLs* RBSLs RBSLs RBSLs RBSLs <br /> 1 ON-SITE COMMERCIAL RECEPTORS <br /> Inhalation of vapors commercial 5 340 >S >S >S >S <br /> migrating to outdoor air worker <br /> inhalation of vapors commercial 21 85 000 >S > S 3,700 000 <br /> migrating to indoor air worker <br /> Maximum Site Concentration 2,200 12 500 2,200 10 300 12 6 <br /> OFFSITE RESIDENTIAL RECEPTORS <br /> JInhalation of vapors residential 3,190 >S >S >S > S <br /> migrating to outdoor air <br /> i inhalation of vapors residential 69 32 800 77 500 >S 1,400 000 <br /> Jmigrating to indoor air <br /> Maximum Site Boundary Concentration 388 494 100 898 126 <br /> (wells MW-4, MW-5, MW-8, and MW-10) <br /> 1 Explanation <br /> BOLD=Site-specific concentration exceeds one or more RBSLs <br /> =Benzene RBSLs have been adjusted(multiplied by 0 29)for California's 0 1 slope factor <br /> IJ **=RBSLs are from EPA Region ill,Risk Based Concentration Table April 15 1998 <br /> RES=Selected risk level is not exceeded for pure compound In any concentration <br /> >S=Selected risk level is higher than solubility of pure compound <br />' rbsisone xis <br /> IJ <br /> 1- <br /> 1- <br /> J <br /> t- <br /> 1� <br /> IPage 2 of 2 <br /> J <br />