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y • <br />~. <br /> <br />RESULTS <br />7 <br />A total of 63 bioassays were conducted during this reporting period <br />' :..x~ <br />including ranee-finding and definitive tests. Results of these tests <br />' are provided in summary form in Table 2. As stated previously, the <br />inorganic chemicals designated "extra chemicals" will not be tested further. <br />Ammonia, PCB and Parathion have not been tested thus far. Methodology for <br />testing the toxicity of ammonia requires further investigation and discussion. <br />These comments will be provided at a later date. -PCB,, used as a general term <br />to describe several chemicals, is highly controlled by safety regulations. <br />At the present time, we have not solved all of the problems associated with <br />the safety regulations concerning these chemicals. Parathion was not tested <br />because the compound was not available. We do not anticipate this being a <br />problem in the future. <br />Lead and iron, in the chemical forms that we used (Pb(C2H~O2]2 2H~O <br />and Fe[S0~]3 nH~0), were precipitated during. bioassays with both types of <br />simulated Willow Beach water .(distilled and artesian well tap water <br />preparations). The conclusion is that the acute toxicity levels for <br />squawfish cannot be reached by these two elements due to the chemistry of <br />the simulated water. <br />DISCUSSION AND RECOI~IENDATIONS <br />The approximate LCS® and estimated ranges of some of the chemicals <br />tested with northern squawfish were not apparent. These were indicated by <br />question marks (?) in Table 2. There are several reasons why there are <br />undetermined LCSO values far some of the toxicity tests such as: the LC~0 <br />was not bracketed by data points; toxicant concentrations were too low or <br />