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. Table 3 .. <br /> Tier t RBCA Results with Groundwater as a Potential Drinking Water Source <br /> ARCO a 6080 <br /> I� <br /> Most RecentCotact ESL-Groundwater is ESL-Groundwater is <br /> Analytical Data Direct Contact Direct nDirect Contact Indoor-Air a Potential a Potential li I <br /> l)1 Soil li Soil ESL Ibl soil ESL I`1 ESL jai Drinking Water Drinking Water <br /> Source!'1 Source!'! ,(, ) <br /> Y Soil LeachinglGW Ceiling Value(Ddor, ; <br /> SOIL(in mglkg) 95%UCL Res f Indust - Res 1 Indust Construction Res f Indust Protection Taste) <br /> Res l Indust <br /> Shallow Soils <br /> TPHg 2.8846 NAY 4091750 6,000 NAY 100 1001500 <br /> Ethylbenzene 24.3 4001400' -4001400' 400 3901390 3.3 4001400 <br /> MTBE 1.1 32170 30168 2,500 215.6 0.023 1001 500 q' <br /> Toluene 32 5207520` 1001340 650' 1307310 2.9 5001650 IF . <br /> Xylene(Total) 269.9 2701 420' 3301420` 420' 3101420 2.3 4201420 ' <br /> ESL-Groundwater is ESL-Groundwater is <br /> Most Recent ESL Drinking <br /> Califomia MCL Drinking Water Indoor-Air a Potential a Potential I+ <br /> Analytical Data PRG'"W Water Toxicity <br /> 1.) , f•I ESL tar Drinking Water Drinking Water il', <br /> .. Source!`) Source <br /> SyRQUNDWATER(in g5°6 UCL - Res f Indust Chronic Freshwater Ceiling Value{Odor, 3 <br /> Pg/L) Aquatic Habitat Goal Taste) <br /> Benzene - 2.1 1 0.35 1 54011,800 46 170 <br /> MTBE 0.49 13 11 13 24,000180,000 66,000 5 <br /> RIPE 7.7 NAY _NAY NAv NAv NAv NAY <br /> Bold=Exceedance of Tier 1 Environmental Screening Levels <br /> NAp=not applicable;NAY-not available,ND=nan-detect. <br /> 1 MTBE=methyl ten-butyl ether <br /> 1 TPHg=total petroleum hydrocarbons as gasoline <br /> TBA=ten-butanol <br /> =Concentration is based on saturation level <br /> (a)Soil EPC is the 95%UCL of 0-10 feel bgs residual samples;Groundwater data are from MW-1.MW-2,and MW-3 from Second Quarter 2006 to First Quarter <br /> (b) For Soils-3m.Tables A-1(Residential)and A-2(Industrial), For soils�3m,Tables C-1(Residential)and C-2(Industrial)(RWQCB,2005). „ <br /> .(c)Table K-3(RWQCB,2005). <br /> (d)Table E-1b for Soils and E-1a for Groundwater-High permeablily soil type(RVJQCB,2095). <br /> (e)Tables A-1 and A-2 for Shallow Soils(-3m bgs)and Table F-1a-and F-4a for Groundwater(RWQCB,2005). , <br /> 1 <br /> (1)USEPA Region 9 PRG Table(USEPA,2004b). ! <br /> (g)California Office ofAciministrative Law,2006. I' <br /> z , <br /> r <br /> i <br /> ' p <br /> 1 <br />