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4 <br />3.0 SUMMARY AND ASSESSMENT OF ANALYTICAL ACTMTIES <br />3.1 ANALYTICAL liESi1LTS <br />The field parameters and analytical results are displayed in Tables 2 and 3, respectively. A <br />discussion of any elevated concentrations or unusual results and comparison to previous <br />results is provided below. <br />3.1.1 Surface Water <br />RS-5. Total and WAD cyanide were again below detection (at 20 µg(1) at this location. The <br />nitrate+nitrite concentration was below detection at 0.05 mg/I, which was Jgwer than that <br />detected in November (100 µg/I). The calcium concentration (19.6 mg/1) wasi similar to that <br />of the March sample but approximately half that of the November sample; the copper <br />concentration was again below detection (at 10 µg/1). The iron concentration was <br />approximately twice that of the March and November samples. Sodium and zinc <br />concentrations (4.2 and 0.01 mg/1, respectively) were nearly identical to those in November <br />and March. <br />3.1.2 Process Points <br />Total cyanide concentrations were highest in the Collection Pond and above detection in all <br />process point samples. WAD cyanide concentrations were above detection in all process <br />point samples except in the Upper Tailings Pond; however, dissolved WAIb cyanide was <br />higher than total WAD cyanide in this sample. In some cases total and/or WAD ryanide <br />concentrations were higher in filtered than in unfiltered samples, and in two simples WAD <br />cyanide was higher than total cyanide. Comparisons of filtered and unfiltered samples and <br />of total and WAD ryanide concentrations will be discussed below. <br />Uoner Tailings Pond. In the upper tailings pond filtered samples had higher concentrations <br />than unfiltered samples for both WAD and total ryanide. WAD ryanide concentrations <br />were lower than total cyanide in both 5ltered and unfiltered samples. The higher <br />concentrations in the filtered samples may indicate that there are analytical interferences for <br />both WAD and total cyanide in the unfiltered samples. Nitrate+nitrite, calcium, copper, <br />iron, sodium and zinc concentrations were very similar to those in samples from the March <br />trip. <br />Total metal concentrations were within 10%RPD of dissolved metal concentrations with the <br />exception of iron and zinc values. The higher iron concentration in the unfiltered sample <br />again indicates that colloidal iron is present in the upper tailings pond. Zinc concentrations <br />are very close to the detection limit (0.01 mg11), but higher concentrations of zittc in all three <br />process points may indicate that colloidal zinc also exists in the upper tailings pond. <br />RCG/Hagler, Bailly, Inc. <br />