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L' <br />C <br />Pacific F,coRisk Environmental Consulting & Testing <br />4. SUMMARY AND CONCLUSIONS <br />1000 E Channel Mites Area Green Liquid On Ground: <br />The results of this test indicate that the waste sample "1000 E Channel Mixing Area Green <br />Liquid On Ground" was acutely toxic to fathead minnows at the test treatment levels. The LCso <br />of this sample was <250 mg/L, which is less than the Title 22 "Hazardous Waste" classification <br />threshold of 500 mg/L, and therefore, the sample should be considered a hazardous waste with <br />respect to fish toxicity. <br />1000 E Channel Mixing Area White Liquid Under Mixer: <br />The results of this test indicate that the waste sample "1000 E Channel Mixing Area White <br />Liquid Under Mixer" was not acutely toxic to fathead minnows at the test treatment levels. The <br />LC5o of this sample was >750 mg/L, which is greater than the Title 22 "Hazardous Waste" <br />classification threshold of 500 mg/L, and therefore, the sample should not be considered a <br />hazardous waste with respect to fish toxicity. <br />1000 E Channel Mixing Area Red Liquid: <br />The results of this test indicate that the waste sample "1000 E Channel Mixing Area Red Liquid" <br />was acutely toxic to fathead minnows at the test treatment levels. The 1_04io of this sample was <br /><250 mg/L, which is less than the Title 22 "Hazardous Waste" classification threshold of 500 <br />mg/L., and therefore, the sample should be considered a hazardous waste with respect to fish <br />toxicity. <br />4.1 QA/QC Summary <br />Test Conditions —Test conditions (pH, D.O., temperature, etc.) were within acceptable limits <br />for these tests. All analyses were performed according to laboratory Standard Operating <br />Procedures. The client waived the pre-test holding period for the fish. <br />Negative Control —The biological responses at the lab Control treatments were within <br />acceptable limits. <br />Concentration -Response Relationship — The concentration -response relationships for these <br />tests were evaluated as per EPA guidelines (EPA -821-B-00-004), and were determined to be <br />acceptable. <br />Page 5 [ U9/28 <br />