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PACIFIC E C 0 R I S K <br />Christina Ruiz <br />GeoAnalytical Laboratories, Inc. <br />2300 Maryann Dr. <br />Turlock, CA 95380 <br />Christina: <br />ENVIRONMENTAL CONSULTING & TESTING <br />January 22, 2019 <br />I have enclosed our report "A Title 22 Hazardous Waste Toxicity Evaluation of a Waste Sample" <br />for the sample designated: "Waste Water Pond 1,2 Composite" that was collected on December <br />13, 2018, and delivered to our testing laboratory on December 20, 2018. This sample was <br />submitted under GeoAnalytical Lab Report # E8L1709 as listed on the chain -of -custody form. <br />The results of this evaluation are summarized below: <br />The results of this evaluation indicate that the waste sample "Waste Water Pond 1,2 Composite" <br />was not acutely toxic to fathead minnows at the tested treatment levels. The 96 -hr LC50 of this <br />sample was >750 mg/L, which is greater than the hazardous waste classification threshold of 500 <br />mg/L, as defined by CA Title 22 CCR §66261.24. Accordingly, the sample should not be <br />considered a hazardous waste with respect to acute aquatic toxicity. <br />If you have any questions regarding this testing or the report, please call Alison Briden at (707) <br />207-7760. <br />Sincerely, <br />Robert Gee <br />Aquatic Ecotoxicologist <br />Pacific EcoRisk is accredited in accordance with NELAP (ORELAP ID 4043). Pacific EcoRisk certifies <br />that the test results reported herein conform to the most current NELAP requirements for parameters for <br />which accreditation is required and available. Any exceptions to NELAP requirements are noted, where <br />applicable, in the body of the report. This report shall not be reproduced, except in full, without the <br />written consent of Pacific EcoRisk. This testing was performed under Lab Order 29758. <br />2250 Cordelia Road, Fairfield, CA 94534 phone: 707.207.7760 fax: 707.207.7916 www.pacifi'cecorisk.com <br />1/13 <br />