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E. CLEANUP AND AS "'.. .�.cNT ORDER NO. 92-707 -4- <br /> AMENDING CLEANUP AND ABATEMENT ORDER<NO. 9720 <br /> FOR SOUTHERN PACIFIC TRANSPORTATION COMPANY, I <br /> TRACY YARD, SAN JOAQUIN COUNTY <br /> ij <br /> I! contaminant levels specified in California Code of Regulations, Title 22, Division 4, <br /> Chapter 15. <br /> i� <br /> "Ground waters designated for use as agricultural supply (AGR) shall not contain <br /> concentrations of chemical constituents in amounts that adversely affect such <br /> E beneficial use. <br /> "Ground waters shall ' -'not contain taste- or odor-producing substances in <br /> 3 <br /> concentrations that cause nuisance or adversely affect beneficial uses." <br /> �1 16. In 1980, the USEPA published a 10-day Suggested-No-Adverse-Response-Level <br /> ti (SNARL) containing a taste and odor.threshold for diesel in water of 100 µg/l. The <br /> USEPA has also published, in the Federal Register, taste and odor thresholds for <br /> selected constituents of concern as follows: <br /> i ethylbenzene 29 µg/i <br /> I toluene 42 µg/I <br /> xylenes 17i <br /> µg/l <br /> EI <br /> I `I The California Department of Health Services (DHS) has established an action level <br /> 1! for 1 ,3-dichlorobenzene;, based on taste and odor, of 20 -µg/l. The USEPA has <br /> established a National Ambient Water Quality Criterion for acenaphthene, based on <br /> ! i taste and odor, of 20 µg11. <br /> `I 17. DHS has established the following Primary Maximum Contaminant Levels for the <br /> € following constituents: <br /> I + chromium 50 µg/l <br /> benzene 1.0 µg/l <br /> r I� <br /> 1,1-dichloroethane `' 5 µg/l <br /> cis-1 ,2-dichloroethylene 6 µg/l <br /> trans-1 ,2-dichloroethylene 10 µg/l <br /> 1,1,1-trichloroethane 200 µg/l <br /> E� <br /> II <br /> trichloroethylene 5 µg/l <br /> I <br /> EI <br /> ii trichlorofluoromethane 150 µg/l <br />