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' ENS( RECO <br /> . 4.0 Regulatory requirements <br /> 4.1 Cleanup criteria objectives <br /> The following tables (Tables 4-1 and 4-2) present potential cleanup criteria applicable to the site. <br /> ' Table 4-1 Groundwater cleanup criteria <br /> Chemical Constituent Cleanup Criteria Reference <br /> Benzene 1 California Primary MCL <br /> Toluene 150 California Primary MCL <br /> Eth (benzene 300 California Primary MCL <br /> Xylenes 1,750 California Primary MCL <br /> MTBE 13 California Primary MCL <br /> Table 4-2 Soil cleanup criteria <br /> Chemical Constituent Cleanup Criteria m Reference <br /> ' Benzene 0.64 EPA Region 9, Preliminary <br /> Toluene 520 Remediation Goals, Direct Contact <br /> Eth (benzene 400 Exposure Pathways, Residential, <br /> October 2004 <br /> Xylenes 270 <br /> Meth I-tert-but I-ether MTBE 32 <br /> TPHg 100 February 2005 Environmental <br /> Screening Levels, San Francisco <br /> Bay Regional Water Quality Control <br /> Board <br /> Site-specific risk-based clean-up criteria may be more appropriate in some cases. For example,the ubiquity of <br /> public water and absence of private wells in the immediate vicinity of the site indicates that there is no current <br /> ' risk associated with exceedances of drinking-water-based groundwater cleanup criteria. <br /> 1 <br /> 1 <br /> J:1Rem_Eng%Project Files\P60(6000- <br /> ' 6999)16940-UNOCAL Portfolio Closure16940 4-1 January 2006 <br /> UNOCAL Pordollo Closure\Site 0187-Stockton <br /> East Minor\CSM Report\CSM Report Final.cfoc <br />