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0 0 <br /> Pacific EcoRisk Environmental Consulting &Testing <br /> 1. INTRODUCTION <br /> Under contract to GeoAnalytical Laboratories, Inc.(GeoAnalytical),Pacific EcoRisk (PER) <br /> conducted a screening Title 22"Hazardous Waste" fish toxicity evaluation of a waste sample, <br /> designated "41008-01".This toxicity test consisted of a 96-hr static bioassay with juvenile <br /> fathead minnows (Pimephales promelas). This report describes the performance and results of <br /> 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 waste sample,designated"41008-01",was delivered to the PER testing laboratory in Fairfield <br /> on April 18,2008, 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 Test Organisms <br /> The Pimephales promelas used in this test were obtained from a commercial supplier (Thomas <br /> Fish Company,Anderson,CA).These fish were maintained at 20°C in aerated aquaria <br /> containing EPA synthetic soft water prior to their use in this test. During this pre-test period,the <br /> fish were fed brine shrimp nauplii ad libitum. <br /> 2.3 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 Lab Control/dilution water consisted of synthetic US EPA "soft' water <br /> (prepared by adding reagent grade salts to reverse-osmosis de-ionized water).After mixing,these <br /> preliminary solutions were used to prepare test solutions at sample concentrations of 250,500, <br /> and 750 mg/L. <br /> Page 1 Pacific EcoRisk I��J <br />