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LABORATORY REPORT Date: June 24, 2021 Client: Advance Technology Laboratories 3275 Walnut Avenue Signal Hill, CA 90755 Attn: Arianna Campuzano Laboratory No.: A-21061801-001/003,-003Dup Sample ID.: 2101347-01/03, -03Dup Executive Summary: AT Aquatic Testing QC Laboratories &,,Iuwl v1lo ponditrq ryualuy m)uatur Imiuly lestfug' 4350 Transport St., Unit 107 Ventura, CA 93003 (805)650-0546 aq u atictesti n gl abs.com CA FLAP Cert Na 1775 NV CeN. Na CA01304 Samples were received in good condition, chilled, with custody seals intact and acceptable for Title 22 Hazardous Waste fish bioassay screen testing (see Sample Control section below). Testing was conducted using fathead minnows (Pimephales promelas) following protocols established by the California Dept. of Fish and Game manual "Static Acute Bioassay Procedures for Hazardous Waste Samples" (Polisini and Miller 1988). Upon completion of sample log -in procedures (see Sample Control section below), the samples were taken to the sample prep/extraction area for subsampling. They were then placed under locked refrigeration at 4°C until returned to client. The chain -of -custody record for sample collection and delivery is attached. Extraction/prep consisted of first homogenizing each sample, then placing measured sub -samples in extraction vessels, adding laboratory test water and placing the sealed vessels on a rotary mixer for six hours. The laboratory test water was prepared by adding reagent grade salts to Type 1 lab water (reverse -osmosis de - ionized water) following the EPA formulation for soft water (EPA 821-R-02-012). The subsamples are then added to test tanks each containing 10 liters of lab test water with the resulting final test concentrations of 400 and 750 mg/L (bracketing the 500 mg/L state criterion). All testing was conducted in duplicate. Ten fish were then added to each test tank and monitored for 96 hours. Fish used were obtained from Thomas Fish and exhibited no mortalities in the 48 hours prior to testing. Water quality parameters, such as dissolved oxygen (DO), pH, and temperature and mortalities are recorded daily. All testing was conducted in a temperature control lab at 20°C, under fluorescent lighting with a photoperiod of 16 light to 8 dark. All test conditions (pH, DO, temperature, etc.) were within acceptable limits. The final fish survival rate was used to determine if the samples pass state criteria for non -hazardous waste namely an LC50 greater than 500 mg/L. In the case of the hazardous waste screen, a less than 40 percent mortality in the 750 mg/l test concentration gives a 95% probability that the LC50 is greater than 500 mg/l and therefore considered non -hazardous with respect to the fish bioassay (Polisini & Miller 1988). Conversely, a greater than or equal to 40% mortality in the 750 mg/L concentration would indicate the presence of toxicity and further testing utilizing the definitive protocol should be considered. No mortalities were found in any of the samples tested in this report at any test concentration tested therefore these samples may be considered non- hazardous with respect to the fish bioassay. Please see Results section below. Page 16 of 33 This report pertains only to the samples investigated and does not necessarily apply to other apparently identical or similar materials. This report is submitted for the exclusive use of the client to whom it is addressed. Any reproduction of this report or use of the Laboratory's name for advertising or publicity purpose without authorization is prohibited.