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Pacific EcoRisk Environmental Consulting & Testing 1. INTRODUCTION Under contract to GeoAnalytical Laboratories, Inc. (GeoAnalytical), Pacific EceRisk (PER) performed screening level Title 22 "Hazardous Waste" fish toxicity evaluations of three liquid waste samples designnted: • "I000 E Channel Mixing Area Green Liquid On Ground", • "1000 E Channel Mixing Area White Liquid Under Mixer", and • "1000 E Channel Mixing Area Red Liquid". These toxicity tests consisted of 96 -hr static bioassays with juvenile fathead minnows (Pimtphales promelas). This report describes the performance and results of these tests. 2. ACUTE TOXICITY TEST PROCEDURES The methods used in conducting these tests followed the guidelines established by the California Dept. of Fish & Game manual "Static Acute Bioassay Procedures for Hazardous Waste Samples" (Polisini and Miller 1988), with additional guidelines as provided by the California Dept. of Health Services (Janna White, personal communication). 2.1 Receipt and Handling of the Waste Sample Three liquid waste samples (designated "1000 E Channel Mixing Area Green Liquid On Ground", "1000 E Channel Mixing Area White Liquid Under Mixer", and "1000 E Channel Mixing Area Red Liquid") were delivered to the PER testing laboratory on June 26, 2014, where they was placed under refrigeration at 4"C until being used to prepare the test solutions. The chain -of -custody record for the collection and delivery of these waste samples are provided in Appendix A. 2.2 Preparation of the Test Media Sub -samples of each waste were mixed with the Lab Water Control medium for 6 hrs, using a rotary mixer. The samples were homogenized as much as possible before mixing with the Lab Water Control medium. The Lab Water Control medium consisted of synthetic US EPA "soft" water (prepared by adding reagent grade salts to Type 1 lab water [reverse -osmosis de -ionized waters). After mixing, these preliminary solutions were used to prepare test solutions at sample concentrations of 250, 500, and 750 mg/L for each sample. 2.2.1 pH Adjustment of the Test Solutions The initial pH levels of the test solutions that were prepared for "1000 E Channel Mixing Area Green liquid On Ground" were >9.0 (Appendix B), which exceeded the acceptable range of 5.0- 9.0. As per the test guidelines, the test solutions were adjusted to pH 8.5 via drop -wise addition of reagent grade HCL prior to test initiation. As a QA Measure, a "pH Adjustment Control" Page t C (l 5128