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ATTACHMENT 1 <br />CHEMICALS DETECTED AT WFS, VERNALIS <br />December 1996 <br />Chemical <br />Maximum <br />Detected, <br />µ g/1 <br />Limiting <br />Criteria, <br />µ g/1 <br />Source <br />Potential <br />water quality <br />problem? <br />Aldrin <br />0.076 <br />0.0021 <br />Cal/EPA CPF <br />YES <br />Ammonia -N <br />1300 mg/1 <br />0.5 mg/1 <br />taste & odor <br />YES <br />Bromodichloromethane <br />I 5.3 <br />0.27 <br />Cal/EPA CPF <br />YES <br />Chlorobenzene <br />4.9 <br />30 <br />Ca RPHL <br />no <br />Chloroform <br />5.3 <br />1.1 <br />Cal/EPA CPF <br />YES <br />DBCP <br />1.2 <br />0.005 <br />Cal/EPA CPF <br />YES <br />1,2 -Dichlorobenzene <br />0.78 <br />10 <br />Ca SAL <br />no <br />1,2-Dichloropropane <br />27 <br />0.56 <br />Cal/EPA CPF <br />YES <br />Diazinon <br />1.0 <br />0.6 <br />USEPA IRIS <br />YES <br />Diuron <br />28 <br />10 <br />USEPA HA <br />YES <br />EDB <br />0.88 <br />0.001 <br />Cal/EPA CPF <br />YES <br />Nitrate -N <br />903 mg/l <br />10 mg/l <br />Ca MCL <br />YES <br />Notes: Cal/EPA CPF = Cal/EPA Cancer Potency Factor <br />taste & odor = taste and odor threshold, as reported in the literature <br />Ca RPHL = California Recommended Public Health Level <br />Ca SAL = California State Action Level <br />USEPA IRIS = value from the USEPA IRIS database <br />USEPA HA = USEPA Health Advisory (toxicity other than cancer) <br />Ca MCL = California Maximum Contaminant Level <br />