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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 Sods Benzene Toluene Ethylbenzene Xylenes Exposure (mglkg) (mglkg) (mglkg) (mg/kg) 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 1migrating to indoor air worker Maximum Site Concentration 25 280 130 730 OFF-SITE RESIDENTIAL RECEPTORS inhalation of vapors residential 26 RES RES RES migrating to outdoor air inhalation of vapors residential 0 066 320 RES RES Imigrating 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 ON-SITE 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 2 200 10,300 OFF-SITE 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) Explanation BOLD=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 >S=Selected risk level is higher than solubility of pure compound sstlstwo AS