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S ° <br />6- Co NO <br />2-0 <br />%,6 TABLE A <br />Summary of Analytical Results <br />Sample Date Depth (ft.) <br />EPA Region IX RSLs Soil Gas Screening Level <br />VOCs <br />TPH -gasoline <br />pg/m' <br />Acetone <br />pgfin' <br />3.2E+07 <br /> <br />dCinantbLne Benzene <br /> <br />irg/m" ug/n' <br /> <br />7.3E+05 .6E+02 <br />Toluene <br />5.2E+06 <br />4-Methy1-2- <br />Pentanone (MIBK) <br />pg/m' <br />3.1E+06 <br />D vlene trt'' <br />pg/m' <br />1.0E+05. <br />Styrene <br />pg/ni' <br />1.0E+0 <br />Hexane <br />pg/m' <br />7.3E+05 <br />2-Hexanone 2-Eittm7K7ne eEnt o 2heylne <br />pg/m' holm' pg/m' <br />3.1E+841 5.2E+06 1.1E+03 <br />1,2,4- <br />trimethylbenzene <br />pg/m' <br />1,3,5- <br />trimethylbenzene <br />pg/m' <br />Tetrahydrofuran <br />ticfitn' <br />Naptbalene <br />pg/m" <br />tert-Butanol <br />pg/m3 <br />Bromomethane <br />pg/m3 <br />6.3E+041_,/ 6.3E+04 2.1E+06 8.3E+01 ' 5.2+03 1,/ 3.1E+04 <br />RWQCB ESLs Soil Gas' 1.5E+07 - L644.8E+01/4 /1.6E+05 5.2E+04 4.7E+05 - 5.6E+02 - 4.1E+01 - 3.0E+05 <br />DTSC Modified Screening Level' - - 6.7E+01,, / 3.1E+05 9.4E+05 - <br />ewe SG - 5 11/20/2018 76.0 ND 3.1 3.7 8.3 ND ND ND 4.1 46 ND ND ND 180 ND 7.5 ND 210 <br />Gib SG - 5 I 11/20/2018 10 120.0 2.3 12 22 15 13.2 ND 11 51 2.4 6.1 2.5 44 3.0 9.3 ND 596 <br />SG - 6 11/20/2018 400.0 ND ND 4.2 14 3.3 ND ND 7.4 110 ND 4.4 ND 240 ND 13 ND 1040 <br />SG - 6 11/20/2018 10 220.0 5.3 19 23 17 14.6 2.1 40 5.9 81 3.2 9.1 2.9 51 ND ND 1.9 1630 <br />SG - 7 11/20/2018 5 180.00 1.7 5.5 6.7 7.0 ND ND ND 9.9 72 ND ND ND 140 ND 4.3 ND 542 <br />11/25/2018 10 190.00 12 33 36 16 13.1 4.9 25 8.7 71 44 4.7 ND 22 ND ND ND 1040 <br />.4-8 11/20/2018 5 ND ND ND ND ND ND ND 3.8 ND ND ND ND ND 16 ND ND NO ND <br />SG - 8 11/20/2018 10 138.00 3.9 12 17 3.8 5.8 ND 9.7 3.2 37 ND ND ND 67 ND 2.7 ND 256 <br />SG - 9 11/20/2018 5 14.00 ND ND ND ND ND ND 12 ND ND ND ND ND 5.2 ND ND ND ND <br />I. SG - 9' u. it? 11/20/2018 10 ND ND _ ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND <br />Notes: <br />NA = not applicable <br />ND = not detected <br />'-'means screening level not reported <br />EPA Region IX Regional Screening Levels for indoor air (November 2017) with an attenuation factor of 0.001 for future residential land use <br />'Regional Water Quality Control Board ESLs for Soil Gas, Residential (February 2016, Rev 3). <br />DISC Modified Screening Levels in Ambient Air (January 2018, updated February 2018) with an attenuation factor of 0.001 for future residential land use <br />0-; - Ct2 rot-) <br />12066.002.000 <br /> ENGEO <br />November 30, 2018 <br />EvierdErcellere.--