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TABLE 4 r <br /> Screening Level HHRA Results <br /> a 7-Eleven Store#19976 <br /> 1399 North Main Street <br /> Manteca,CA <br /> Maximum Residential Carcinogen Residential Non- <br /> Chemical Concentration Sample Location Screening Level Cancer Risk Hazard Quotienta <br /> (Ng/m3) (ug/m3) Screening a evel` <br /> (Ng/ m) <br /> Benzene 41,000 SG-9 �kO 3.6E+01 3.15E+04 1.1E-03 1.3E+00 <br /> Toluene o0fl 10,000 Not Detected U454- NA /,3 it I 1.35E+05 NA 7AE-02 <br /> Eth (benzene Q0 10,000 Not Detected S V4.2E+02 <br /> a ,}(t} nears4L 1.05E+06 2.4E-05 9.5E-03 <br /> Total Xylenes 24,600 10,000 Not Detected OWL, NA 3.0x1~+ 1.05E+05 NA 9.5E-02 <br /> TPH /0 od1 2,500,000 SG-9 NA .5:00E+04 NA 5.0E+01 <br /> MTBE 2,200,000 SG-9 If5L'4.00E+03 3.15E+06 5.5E-04 7.0E-01 <br /> v CUMULATIVE RISK 1.7E-03 5.2E+01 <br /> Definitions <br /> Ng/m3=micrograms per cubic meter _ r.,,,, <br /> TPHg=.Total petroleum hydrocarbons in the gasoline range <br /> MTBE=Methyl tertiary butyl ether <br /> Explanations <br /> 'Toluene,Ethylbenzene,and Xylenes were not detected. The maximum laboratory analytical reporting limit was used as the maximum concentration. <br /> bLowest value between California Human Health Screening Levels(Cal-EPA,2005)Region 2 ESLs(SFRWQCB,2008)based on a cancer risk of 1E-06 <br /> °Lowest value between the residential CHHSLs(Cal-EPA,2005)and ESLs(RWQCB,2008)based on a hazard quotient of 1.0 <br /> d(Maximum Concentration/Residential Carcinogen Screening Level)'1.0E-06 <br /> 'Maximum.Concentration/Residential Non-carcinogen screening level - - <br /> i <br /> I:\7-Eleven\7-11 Stores\19976\Tables\19976 Vapor Risk Assessment Tables.xis Page 1 of 1 <br />