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Pacific EcoRisk Environmental Consulting&Testing <br /> 1.INTRODUCTION <br /> Under contract to GeoAnalytical Laboratories,Inc. (GeoAnalytical), Pacific EcoRisk (PER) <br /> conducted a screening level Title 22 "Hazardous Waste" fish toxicity evaluation of a liquid waste <br /> sample designated"purge tank".This toxicity test consisted of a 96-hr static bioassay with <br /> juvenile fathead minnows (Pimephales promelas).This report describes the performance and <br /> results of this test. <br /> 2.ACUTE TOXICITY TEST PROCEDURES <br /> The methods used in conducting this test followed the guidelines established by the California <br /> Dept. of Fish & Game manual "Static Acute Bioassay Procedures for Hazardous Waste Samples" <br /> (Polisini and Miller 1988), with additional guidelines as provided by the California Dept. of <br /> Health Services (Janna White,personal communication). <br /> 2.1 Receipt and Handling of the Waste Sample <br /> A liquid waste sample designated"purge tank"was delivered to the PER testing laboratory on <br /> January 28,2014, where it was placed under refrigeration at 4°C until being used to prepare the <br /> test solutions.The chain-of-custody record for the collection and delivery of this waste sample is <br /> provided in Appendix A. <br /> 2.2 Preparation of the Test Media <br /> Sub-samples of the waste were mixed with the Lab Control/dilution water for 6 hrs,using a <br /> rotary mixer.The sample was homogenized as much as possible before mixing with the Lab <br /> Control/dilution water.The Lab Control/dilution water consisted of synthetic US EPA"soft" <br /> water(prepared by adding reagent grade salts to Type 1 lab water [reverse-osmosis de-ionized <br /> water]). After mixing,these preliminary solutions were used to prepare test solutions at sample <br /> concentrations of 250,500,and 750 mg/L. <br /> 2.2.1 pH Adjustment of the Test Solutions <br /> The initial pH levels of the test solutions were>9.0 (Appendix B), 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. <br /> Page I L It > <br /> 4/19 <br />