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TABLE 5 <br /> • ESLs COMPARED TO SITE CONDITIONS <br /> ESL, MAxtmum soil <br /> Parameter mg/kg concegtratton,mg/kg Location,Depth,Date <br /> ' Benzene 018 NIA N/A <br /> Toluene 93 13 MW-2 @ 20 5' 8/12/98 <br /> Ethylbenzene 47 011 MW-2 @ 28 5' 8112198 <br /> Xylene 15 42 MW-2 @ 20 5' 8/12/98 <br /> ' TPHd 500 14,000 MW-2 @ 20 5' 8112/98 <br /> TPHg 400 870 MW-2 @ 20 5' 8112198 <br /> Source Table D,Interim Final—SF Bay RWQCB—July 2003 <br /> The October 2004 CAP also compared groundwater analytical results to the environmental screening <br /> ' levels (ESLs) developed for the potential for chemicals in groundwater to volatilize and impact indoor <br /> air Table 6 compares the maximum concentrations of petroleum constituents detected in groundwater <br /> to the Water Quality Objectives(WQO) <br /> ' TPHd and TPHg have been detected in groundwater samples collected from wells MW-2, MW-3, and <br /> MW-4 at concentrations that exceed water quality objectives (WQOs) established by the Regional <br /> lie, Water Quality Control Board, Central Valley Region (RWQCB) The WQOs for TPHd and TPHg are <br /> 100 micrograms per liter (ug/L) and 5 uglL, respectively, and the WQOs are based on taste and odor <br /> thresholds for drinking water(Table 6) The concentrations recorded for MW-2 are associated with the <br /> free product that has periodically appeared in this well <br /> TABLE 6 <br /> ' WQO's COMPARED TO SITE CONDITIONS <br /> WOO, Maximum groundwater <br /> 1Parameter u L conc.en_tration,u� � Location,Date <br /> _- <br /> Benzene 10 46 MW-2/Nov, 1998 <br /> Toluene 150 600 MW-35une,2004 <br /> Ethylbenzene 300 N/A N/A <br /> Xylene 1750 19,000 MW-2/Sept , 2001 <br /> TPHg** 100 240,000* MW-2/August,2004 <br /> ' TPH8** 5 370,000 MW-2/Sept,2001 <br /> • indicates TPHg result with presence of free prbdUo <br /> WQO values for TPHg and TPH,arc for taste and odor thresholds,values for benzene,toluene, <br /> ethylbenzene,and xylenes are California primary maximum contaminant levels(MCL's) <br /> • <br /> 1 - <br /> 15 <br /> R 1C0NTGRA111Stoc11on\CANCAP ADDENDUM <br />