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4 <br />3.0 SUMMARY AND ASSESSMENT OF ANALY'1TCAL ACTM7'IES <br />3.1 ANALYTICAL RESULTS <br />The 5eld parameters attd analytical result:; acre displayed in Tables 2 and 3, re::pectively. 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 />kS-5. Total and WAD cyanide were again below detection (at 20 µg/I) at this locution. The <br />nitrate+nit~ite concentration was below detection at 0.05 mg/l, which was lower than that <br />detected in November (100 µg/1). The calcitrm concentration (19.6 mgp) was similar to that <br />of the March sample but approximately half that of the November sample; the copper <br />concentration was again below detectie~n (at 10 µg/1). The iron concentration was <br />approximately twice that of the Marcli and November samples. Sodium and zinc <br />concentrations (4.2 and 0.01 mg/l, respecti.vc:ly) were nearly identical to those in November <br />and March. <br />3.1.2 Process Points <br />Total cyanide concentrations were highest in the G~llection Pond and above detection in all <br />process point samples. WAD cyanide wnc;entrations were above detection in :tll process <br />point samples except in the Upper Tailings Pond; hov~ever, dissolved WAD cyanide was <br />hieher than total WAD cyanide in this sample. In some cases total and/or WAD cyanide <br />concentrations were higher in filtered than in unfiltered samples, and in two samples WAD <br />cyanide was higher than total cyanide. Comparisons of filtered and unfiltered samples and <br />of total and WAD cyanide concentrations• will be discussed below. <br />iJnoer Tailin Pond. In the upper tailings pond filtered samples had higher concentrations <br />than unfiltered samples for both WAD and total cyanide. WAD cyanide concentrations <br />were lower than total cyanide in both filtered and unfiltered samples. The higher <br />concentrations in the filtered samples may indicate that there are analytical intc:rfc:rences for <br />both WAD and total tyanide in the unfiltered samples. Nitrate+nitrite, calctium, copper, <br />iron, sodium and zinc concentrations were: very similar t.o 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 rngJl), but higher concentrations of zinc in all three <br />process points may indicate that colloidal zinc also exists in the upper tailings pond. <br />RCG/Hagler, Bailiy, Inc <br />