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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 "purge tank" was not acutely toxic <br /> to fathead minnows at the test treatment levels.The LC50 of this sample was>750 mg/L, which <br /> is greater than the Title 22 "Hazardous Waste" classification threshold of 500 mg/L, and <br /> therefore,the sample should not be considered a hazardous waste with respect to fish toxicity. <br /> 4.1 QA/QC Summary <br /> Test Conditions—The initial pH levels of the test solutions were>9.0, which exceeded the <br /> acceptable range of 5.0-9.0. As per the test guidelines,the test solutions were adjusted to pH 8.5 <br /> via drop-wise addition of reagent grade HCL prior to test initiation. As a QA Measure,a"pH <br /> Adjustment Control" treatment consisting of Control treatment medium similarly adjusted to pH <br /> 8.5 was also prepared and tested. All other test conditions (D.O.,temperature,etc.) were within <br /> acceptable limits for these tests. All analyses were performed according to laboratory Standard <br /> Operating Procedures.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 4 L�� <br /> 7/19 <br />