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Concentration Limits <br /> Compound arts per billion Source <br /> Benzene 10 California Pnmary Maximum Contaminant Levels <br /> Toluene 42 Taste and Odor Threshold <br /> Ethlbenzene 29 Taste and Odor Threshold <br /> X lenes 17 Taste and Odor Threshold <br /> TPPH-g 50 Detection Linut <br /> TPH-d 100 SNARL <br /> The concentration limits were obtained from a May 17, 1995 Memorandum from Dr Jon <br /> Marshack to Technical Staff of the RWQCB These levels have been applied as the concen- <br /> tration limits as they are deemed RWQCB policy However, the regulated community has <br /> taken some exception to the taste and odor thresholds As tins discussion is resolved, the <br /> concentration limits may be revised accordingly in the future with appropnate regulatory <br /> review <br /> It should be noted that other conditions may make the use of shallow occurring groundwater <br /> for municipal supply unlikely Use as a drinking water source may necessitate water treat- <br /> ment, regardless of petroleum hydrocarbon impact <br /> The aforementioned water quality goals apply to the site during remediation and beyond, <br /> however, they may be modified at any time if it can be shown that changes are (1) consistent <br /> with the maximum benefit to the people of the State, and (2)will not unreasonably affect <br /> present or probable future beneficial uses of groundwater <br /> • 3201337B/CAP_AMD DOC 11 November 30, 1995 <br />