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STOCKTON WASTEWATER TREATMENT PLANT <br /> 100 ACUTE EFFLUENT TOXICITY TO CERIODAPHNIA <br /> + + + + <br /> + ®FO <br /> 90 m <br /> + + <br /> 80 w ® U o p o <br /> 70 + — t — + + l <br /> J + + + <br /> Q t <br /> > 60 EEO+ o <br /> > t +FF + tfi--F <br /> 7 t + <br /> a <br /> N 50 + + ®+ <br /> Z + <br /> U ++ t <br /> Cc w 40 e+ ra + <br /> a- <br /> + + <br /> 30 + + + <br /> + Cl+ <br /> 20 +o 0 <br /> 10 + <br /> o El <br /> o —1— --miu— <br /> Feb-88 Sep-88 Apr-89 Oct-89 May-90 <br /> DATE <br /> ® 48-hr acute test + 7 test mean <br /> Figure 2 <br />