ARCHIVED REPORTS_REPORT ON SOIL VAPOR SAMPLING AND HUMAN HEALTH RISK ASSESSMENT DEC 2010

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Table 3 Soil Vapor Analytical Results and Comparison to CHHSLs Chevron Facility#306620(Former Unocal#5098) 5400 and 5606 Pacific Avenue, Stockton, California SAMPLE ID DATE TPHg B T E X Naphthalene (Pg)m') (Ppb✓) (Pg)m 3) (Ppb✓) (Pg-7m') (PPb✓) (Pg7m') (Ppb✓) (PgIm') (Ppb✓) (Pglm') (Ppb✓) CHHSLs(residential) 26,071 36.2 135,000 420 315,000 31.9 CHHSLs(commercial/industrial) 73,000 122 378,000 1400 879,000 106 ESLs(residential) 10,000 84 63,000 980 21,00072 ESLs(commercial/industrial) 29,000 280 180,000 3,300 58,000 240 SV-1 5/20/2010 470,000 110,000 49 15 <52 <14 <60 <14 <60 <14 <290 <55 9/9/2010 1,000,000 250,000 62 20 <56 <15 <64 <15 <64 <15 <310 <59 10/20/2010 17,000 4,100 <5.6 <1.7 <6.6 <1.7 <7.6 <1.7 <7.6 <1.7 <36 <7.0 SV-1 (Dup) 9/9/2010 1,000,000 250,000 67 21 <56 <15 <64 <15 <64 <15 <310 <59 SV-2 5/20/2010 <76 <19 <3.0 <0.93 <3.5 <0.93 <4.0 <0.93 <4.0 <0.93 <19 <3.7 10/20/2010 <170 <41 <2.6 <0.82 <3.1 <0.82 <3.5 <0.82 <3.5 <0.82 <17 <3.3 SV-2D(Dup) 5/20/2010 <75 <18 <2.9 <0.92 <3.4 <0.92 <4.0 <0.92 <4.0 <0.92 <19 <3.7 10/20/2010 <170 <41 <2.6 <0.82 <3.1 <0.82 <3.5 <0.82 <3.5 <0.82 <17 <3.3 SV-3 5/20/2010 1,200 280 14 4.4 38 10 <3.4. <0.78 11.7 2.7 <16 <3.1 10/20/2010 <190 <47 <3.0 <0.94 <3.5 <0.94 <4.1 <0.94 <4.1 <0.94 <20 <3.8 FB-1 5/20/2010 <91 <22 <3.6 <1.1 16 4.4 <4.8 <1.1 5.0 1.2 <23 <4.5 9/9/2010 <720 <180 <28 <8.8 <33 <8.8 <38 <8.8 <38 <8.8 <180 <35 10/20/2010 <180 <44 <2.8 <0.88 <3.3 <0.88 <3.8 <0.88 <3.8 <0.88 <18 <3.5 FB-1 (Lab Dup) 5/20/2010 <91 <22 <3.6 <1.1 16 4.3 <4.8 <1.1 5.2 1.2 <23 <4.5 EXPLANATION: CaIEPA= California Environmental Protection Agency. CaIEPA,2005= Use of California Human Health Screening Levels in Evaluation of Contaminated Properties.January 2005.Table 2. CalEPA,2009= California Human Health Screening Levels for Ethylbenzene. Draft Report. November 2009. CHHSL= California Human Health Screening Levels(CalEPA,2005 and CalEPA, 2009). (Ng/m')= Micrograms per cubic meter ppbv= Parts per billion by volume TPHg = Total petroleum hydrocarbons as gasoline by modified EPA method TO-3 B= Benzene by modified EPA method TO-15 T= Toluene by modified EPA method TO-15 E= Ethylbenzene by modified EPA method TO-15 X= Total Xylenes by modified EPA method TO-15(Calculated by adding reported values of m,p-xylene and o-xylene.) <= not detected above indicated laboratory reporting limit. Shading indicates an exceedence of the residential and/or commercial/industrial CHHSL. 60146576 1 of 4 AECOM