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Pacific EcoRisk <br />1. INTRODUCTION <br />Environmental Consulting & Testing <br />Under contract to GeoAnalytical Laboratories, Inc. (GeoAnalytical), Pacific EcoRisk (PER) <br />conducted screening level Title 22 "Hazardous Waste" fish toxicity evaluations of two liquid <br />waste samples designated "Entrance Trailer -East 1 Gallon Jug Pink -Cleans" and "Entrance <br />Trailer -East All Supercleaner White Powder". These evaluations consisted of 96 -hr static tests <br />with juvenile fathead minnows (Pimephales promelas). This report describes the performance <br />and results of these tests. <br />2. ACUTE TOXICITY TEST PROCEDURES <br />The methods used in conducting these tests 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 />Two liquid waste samples designated "Entrance Trailer -East 1 Gallon Jug Pink -Cleans" and <br />"Entrance Trailer -East All Supercleaner White Powder" were delivered to the PER testing <br />laboratory on June 26, 2014, where they were placed under refrigeration at 4°C until being used <br />to prepare the test solutions. The chain -of -custody record for the collection and delivery of these <br />waste samples are provided in Appendix A. <br />2.2 Preparation of the Test Media <br />Sub -samples of each waste sample were mixed with the Lab Water Control medium for 6 hrs, <br />using a rotary mixer. The samples were homogenized as much as possible before mixing with the <br />Lab Water Control medium. The Lab Water Control medium consisted of synthetic US EPA <br />"soft" water (prepared by adding reagent grade salts to Type 1 lab water [reverse -osmosis de - <br />ionized water]). After mixing, these preliminary solutions were used to prepare test solutions at <br />sample concentrations of 250, 500, and 750 mg/L for each of the two waste samples. <br />2.2.1 pH Adjustment of the Test Solutions <br />The initial pH levels of the test solutions that were prepared for "Entrance Trailer -East 1 Gallon <br />Jug Pink -Cleans" were >9.0 (Appendix B), which exceeded the acceptable range of 5.0-9.0. As <br />per the test guidelines, the test solutions were adjusted to pH 8.5 via drop -wise addition of <br />reagent grade HCL prior to test initiation. As a QA Measure, a "pH Adjustment Control" <br />treatment consisting of Control treatment medium similarly adjusted to pH 8.5 was also prepared <br />and tested. <br />Page 1 L <br />4121 <br />