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METHODS <br />An effluent grab sample from Somerset Mining was collected on <br />August 23, 1993, and received at Commercial Testing and Engineering <br />(CT&E) approximately 24 hours later where it was assigned CT&E <br />number 72-257736. Discharge receiving water from the Gunnison <br />River was also collected and delivered on the same dates. <br />The chemical characteristics of the effluent, receiving and <br />laboratory waters were measured. The pH, dissolved oxygen, <br />alkalinity, hardness, conductivity, ammonia and residual chlorine <br />were determined as follows. The pH was measured using a Fisher <br />Scientific model 910 pH meter and dissolved oxygen was measured <br />with a YSI model 54A oxygen meter. Alkalinity and hardness were <br />determined by titrimetric methods specified by the American Public <br />Health Association (1989). Conductivity was measured with a Jenway <br />PCM 3 conductivity meter. Ammonia was measured using a LaMotte <br />ammonia nitrogen test kit and total residual chlorine was measured <br />using a LaMotte model STC-C1 colorimeter. A toxic metals scan was <br />performed using ARL/Fisons 3410 ICP. <br />Acute tests were conducted in accordance with the most recent <br />protocols specified by the Water Quality Control Division of the <br />Colorado Department of Health, (1), as outlined in Table 1 and, <br />with additional guidance from the Environmental Protection Agency's <br />Methods for Aquatic Toxicity Identification Evaluations, Phase 1 <br />Toxicity Characterization Procedures (2). <br />-2- <br />COMMERCIAL TESTING & ENGIN EE RING CO. <br />^~in al Wa~erm arketl Foi Your Pro iecuon ~~` <br />