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Pacific EcoRisk Environmental Consulting & Testing <br />4. SUMMARY AND CONCLUSIONS <br />The results of this toxicity test indicate that the waste sample "Sample IA" was not acutely toxic <br />to fathead minnows at the test treatment levels. The LCso of this sample was 3750 mg/L, which <br />is greater than the "hazardous waste" toxicity threshold of 500 mg/L, indicating that this sample <br />should a&( be considered "hazardous" with respect to fish toxicity. <br />4.1 QA/QC Summary <br />Test Conditions - On the third day of testing, D.O. was measured at —4 mg/L in the 750 mg/L <br />treatment; accordingly, all test replicates we aerated for the remaining duration of the test. All <br />other test conditions were within acceptable limits for this test. All analyses were performed <br />according to laboratory Standard Operating Procedures. The client waived the pre-test holding <br />period for the fish. <br />Negative Control — The biological responses at the Lab Control treatment were within <br />acceptable limits. <br />Concentration -Response Relationship - The concentration -response relationship for this test <br />was evaluated as per EPA guidelines (EPA -$21-B-00-004), and was determined to be acceptable <br />for this testing. <br />Page 3 C <br />6112 <br />