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Detected Chemical <br />Table <br />• <br />Tier 1 Evaluation ForGroundwater <br />Benzene <br />Pathway Eaclumon Analysis <br />5,800 <br />Former Chevron Service Station 95775 <br />Toluene <br />301. West Kettleman Lane <br />530 000 <br />Lodi, California <br />Detected Chemical <br />Ground Water <br />Concentration <br />(Cgw, U91L) <br />(1191L' <br />1 <br />((1191L)9J</L) <br />Cgw Exceeds RBSL- <br />(YeslNo) <br />Benzene <br />397 <br />5,800 <br />No <br />Toluene <br />43 <br />530 000 <br />No <br />Ethyl -benzene <br />45 <br />170,000 <br />No <br />Xylenes <br />44 <br />161,000 <br />No <br />MTBE <br />89,559 <br />2 7 x 10' <br />No <br />Methanol <br />4096 <br />NA <br />_ - <br />Ethanol <br />28,897 <br />NA <br />- - <br />TBA <br />9,867 <br />NA <br />- - <br />DIPE>, <br />171 <br />2 7 x 11Y <br />No <br />EME b <br />2,036 <br />2 7 x 16' <br />No <br />TAME b <br />673 <br />2 7 x 10' <br />No <br />1,2 -DCA <br />121 <br />29,000 <br />No <br />EDB <br />121 <br />NA <br />- <br />TCE <br />1 <br />57,000 <br />No <br />P -H MB ` <br />1 <br />161,000 <br />No <br />PCE <br />1 <br />15,000 <br />No <br />Abbreviations <br />ug(L = micrograms per liter <br />NA = not available <br />- = can not evaluate <br />RBSL = Risk Based Screening Level for groundwater volatilization to residential indoor air <br />MtBE = Methyl ternary butyl ether <br />TBA = Tertiary butyl alcohol <br />DIPS = Di- sopropyl ether <br />EtBE = Ethyl ternary butyl ether <br />TAME = Tertiary amyl methyl ether <br />1,2 -DCA =1,2-dichloroethane <br />EDB = Ethylene dibromrde <br />ME = Trichloroethylene <br />pdPMB = para- isopropyl methyl benzene <br />PCE = Tetrachloroelhene <br />Footnotes <br />`From CRWQCB (2000), Values are for fine-grained soils, as available. <br />RBSL values not available for these chenucals, so the value for MTBE, which is closely related, was used. <br />'RBSL value not available for this chemical, value for xylenes, a closely related chemical, was use& <br />Referenem <br />California Regional Water Quality Control Board (CRWQCB) 2000 Application of Risk Based Screening Levels and Decision <br />Making to Sites With Impacted Soil and Groundwater August. <br />M IProjectslChevronMxdARBCAids1GW Tier 1 Page 1 of 1 4 51 PM, 51MI <br />