Laserfiche WebLink
' Pozzolanic Northwest, Inc.• S <br /> Northwest Larramie River Fly Ash 4-2791 2 1984 <br /> ' Northwest Jim Bridger Fly Ash 4-2792 <br /> FISH BIOASSAY <br /> ' The following points relate to the test method: <br /> ' 1. The test procedure was that which is described in Standard Methods for the <br /> Examination of Water and Wastewater (15th Edition) . <br /> ' 2. The test species was fathead minnow (Pimephales promelas) . <br /> ' 3. Soft water was used to make up the test solutions_ The total hardness was <br /> 46 mg/1 as calcium carbonate. <br /> 4. The sample required no screening. It was. already fine enough to pass through <br /> ' a number 10 (two millimeter) standard sieve. <br /> 5. . Two control tanks were used. One contained the soft water that was used in <br /> ' the test tank. The other contained the same water as that in the holding tank. <br /> 6. A preliminary test showed that the fish were able to tolerate a solution containing <br /> ' more than 750 mg/1 of the fly ash sample. Therefore, the percent survival method <br /> was used. This allowed the use of 20 fish per tank instead of the 10 fish per <br /> tank as called for in the LC50 method. <br /> ' 7. The test tank contained 750 mg/1 of fly ash sample in soft water. <br /> 8. The sample was alkaline so hydrochloric acid was added to the test tank to adjust <br /> ' the pH to equal that of the soft water control tank. <br /> 9. Alpha Analytical Laboratories, Inc., is approved for fish toxicity bioassay <br /> examinations by the State of California Department of Public Health. <br /> Alpha <br /> Analytical Laboratories, Inc. <br />