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I ~ Parameter <br />Nitrite <br /># of Sites / # of Excursions <br />2/2 <br />Nitrites are unstable in aerated water (Hem, 1989), and will oxidize to <br />nitrates. <br />Ammonia values require extra calculations to determine exceedences. The <br />standard is 0.02 mg/1 un-ionized NH3, while the method detects both un- <br />ionized NH3 and ionized NH4. The following table calculates the actual <br />un-ionized NH3 concentration of the exceedences reported on Table 12. <br />Site Date NH3+NH4,mg/1 pH Temp,C $NH3 NH3 concentration, mg/1 <br />NPDESB 9-16-02 0.34 7.99 15 1.8 0.006 <br />SSF13 5-7-02 0.07 8.75 15 21 0.015 <br />Neither sample exceeds the ammonia standard. <br />Sulfide values also require extra calculations. The standard is 0.002 <br />mg/1 un-ionized H2S, while the method detects for un-ionized H2S and <br />ionized HS. The following table calculates the actual un-ionized H25 <br />concentration of the exceedences reported on Table 12. <br />Site Date H2S+HS,mg/1 pH <br />NPDES4 4-15-02 0.12 7.70 <br />NPDESB <0.2 (elevated d <br />NPDE58 9-16-02 0.03 7.99 <br />SSF11 5-7-02 0.05 8.70 <br />SS F13 0.12 8.75 <br />8H25 H2S concentration, mg/1 <br />17.0 0.020 <br />=_tection limit, did not calculate; <br />9.00 0.003 <br />2.05 0.001 <br />1.82 0.002 <br />Only the NPDES4 sample and the September NPDESS sample experienced <br />exceedences of the sulfide standard. Any sulfides present in surface <br />water should eventually oxidize to sulfates. <br />There was one chromium, one copper and one nickel value that had <br />elevated detection limits higher than the standard. The cause of these <br />elevated detection limits was a decision by the laboratory to dilute the <br />21 <br />