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1 TABLE 8 Comparison of Site-Specific Concentrations to Tier 2 Site-Specific Target Levels (SSTLs) (Cancer Risk=1 in a million Chronic HQ=1) Jackpot Food Mart 14000 East Highway 88 Lockeford California SUBSURFACE SOILS(>5 feet bgs) Subsurface Sails Benzene Toluene Ethylbenzene Xylenes r Exposure (mg/kg) (mg/kg) (mg/kg) (m9/kg) J Pathway Receptor SSTLs' SSTLs SSTLs SSTLs ON-SITE COMMERCIAL RECEPTORS inhalation of vapors commercial 1 5 RES RES RES migrating to outdoor air worker inhalation of vapors commercial 00074 83 140 RES migrating to indoor air worker J Maximum Site Concentration 25 280 130 730 OFFSITE RESIDENTIAL RECEPTORS inhalation of vapors residential 26 RES RES RES migrating to outdoor air Inhalation of vapors residential 0 058 320 RES RES migrating to indoor air Maximum Site Boundary Concentration 0 064 0 005 not detected 0 007 (borings for MW-4 MW-5 MW-8 and MW-10) GROUNDWATER Groundwater Benzene Toluene Ethyl- Xylenes Exposure (ug/L) (ug/L) (ug/L) (ug/L) Pathway Receptor SSTLs' SSTLs SSTLs SSTLs ONSITE COMMERCIAL RECEPTORS Inhalation of vapors commercial 4 900 >S >S >S migrating to outdoor air worker Inhalation of vapors commercial 32 130 000 >S >S migrating to indoor air worker Maximum Site Concentration 2,200 12 500 2200 1030o OFFSITE RESIDENTIAL RECEPTORS Inhalation of vapors residential 2 900 >S >S >S migrating to outdoor air inhalation of vapors residential 10 49,000 110 000 >S migrating to indoor air Maximum Site Boundary Concentration 388 494 100 898 (wells MW-4,MW-5 MW-8 and MW-10) Exp1 nation SOLD=Site-specific concentration exceeds one or more SSTLs `=Benzene SSTLs have been adjusted(multiplied by 0 29)for California's 0 1 slope factor RES=Selected risk level is not exceeded for pure compound in any concentration >5=Selected risk level is higher than solubility of pure compound sstistwo AS