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TABLE 7 <br /> Comparison of Site-Specific Concentrations to <br /> Tier 1 Risk-Based Screening Levels (RBSLs) <br /> (Cancer Risk= 1 in a million Chronic HQ= i) <br /> Jackpot Food Mart <br /> 14000 East Highway 88 Lockeford California <br /> SURFACE SOILS(<5 feet bgs) <br /> Surface Soils Benzene Toluene Erthyibenzene Xylenes 1,2 Dibromoethane <br /> Exposure (mgfkg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) <br /> Pathway Receptor RBSLs' RBSLs RBSLs RBSLs RBSLs** <br /> dermal contact,ingestion construction 24 RES RES RES 0 067 <br /> and inhalation worker <br /> dermal contact, ingestion, commercial 29 18 700 11 500 208,000 0 067 <br /> and inhalation worker <br /> dermal contact, ingestion residential 169 13 300 7 830 145 000 00075 <br /> and inhalation <br /> Maximum Source Area Concentration 098 22 24 230 — <br /> (from UST pat backfill samples collected 9191) <br /> SUBSURFACE SOILS(>5 feet bgs) _ <br /> Subsurface Sods Benzene Toluene Ethylbenzene Xylenes 1,2 Dibromoethane <br /> Exposure (mgfkg) (mg/kg) (mgfkg) (mglkg) (mg/kg) <br /> Pathway Receptor RBSLs' RBSLs RBSLs RBSLs RBSLs <br /> ON-SITE COMMERCIAL RECEPTORS <br /> inhalation of vapors commercial 0 133 RES RES RES 0 067 <br /> migrating to outdoor air worker <br /> inhalation of vapors commercial 00032 55 1 100 RES 0 067 <br /> migrating to indoor air worker <br /> Maximum Site Concentration 25 280 130 730 00070 <br /> OFF-SITE RESIDENTIAL RECEPTORS <br /> inhalation of vapors residential 0 0789 RES RES RES 00075 <br /> migrating to outdoor air <br /> inhalation of vapors residential 00016 206 427 RES 00075 <br /> migrating to indoor air <br /> Maximum Site Boundary Concentration 0 064 0 005 not detected 0 007 not detected <br /> (bonngs for MW-4 MW-5, MW-8,and MW-10) <br /> 1 Page 1 of 2 <br />