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Pacific EcoRisk Environmental Consulting and Testing <br /> 4. SUMMARY AND CONCLUSIONS <br /> A screening-level Title 22 hazardous waste acute toxicity evaluation was performed for the <br /> waste sample designated S-2,S-3,S-4,S-4@2' Composite. The results of this test are summarized <br /> below. <br /> The LCso of the sample S-2,S-3,S-4,S-4@2' Composite was>750 mg/L, which is greater than <br /> the hazardous waste classification threshold of 500 mg/L, as defined by CA Title 22 CCR <br /> §66261.24. Accordingly,the sample should not be considered a hazardous waste with respect to <br /> acute aquatic toxicity. <br /> 4.1 QA/QC Summary <br /> Test Conditions—After approximately 24 hours of exposure,the D.O. in the A and B replicates <br /> of the 750 mg/L treatment dropped to 3.1 mg/L and 3.6 mg/L,respectively. In order to prevent <br /> mortalities due to hypoxia, all test replicates were aerated for the remaining duration of the test. <br /> Otherwise, all test conditions(pH,temperature, D.O., etc.) were within acceptable limits for this <br /> test and all test analyses were performed according to laboratory Standard Operating Procedures. <br /> The client waived the pre-test holding 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-821-B-00-004), and was determined to be acceptable. <br /> Page 3 C))> <br /> 6/13 (( <br />