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- <br /> a Harding Lawson Associates <br /> s <br /> } <br /> ..i <br /> Table 5. Summary of BTXE Action Levels <br /> - i <br /> 3 Constituent DHS Action Level* <br /> Laazene 0.70 ppb <br /> Toluene 100 ppb <br /> Total Xylenes 620 ppb <br /> Ethyl. Benzene 680 ppb <br /> i Region 9, EPA Memorandum 9/24/87; Updated Drinking Water <br /> Standards and Health Advisory Table. <br /> i <br /> LI <br /> kni <br /> " <br /> � r <br /> E <br /> s } <br /> } <br /> R <br /> .... <br /> , 4 <br /> .. .. ., ole .. <br />