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• Consequently, for the rinse blank sample a filter paper should be placed in the filter barrel after the washing and rinsing stages and before the collection of the rinse blank so that the effect of the filter membrane on the sample can be determined. The DI water used for rinsing and field/rinse blanks was provided by the BMRI on-site laboratory. The DI water taken was channeled through the prefilter portion of the ion- exchange system but not through the final three columns of the ion-exchange system. There seemed to be an ample supply of "fully" deionized water, and if water from the BMRI laboratory is used again, the final DI water should be used. The duplicate sa~nle should be sent4o a_second. independent ]aboFatory (T1R-0046, gg._19). by_ B_IYiI3I.. In light of all the analytical problems with WAD ryanide, this would be an ~Vi(~ excellent idea. In additi_o~ I recommend the_.us~of a ~erformance_evaluat>;on standard or ~ ~// cyanide -- a standard of known cyanide concentration that would be submitted as a separate ~s~ sample to the analytical laboratories, and that could be diluted in one of the samples from ~{~"'"`~ the site that may present matrix interference problems, such as the collection or tailings 1G; f "-~~ pond samples. Several companies in the metro Denver area sell performance evaluation ~P ~e~r~ standards for cyanide and other constituents. 23 Sample Preservation The samples were not checked after filling the bottles to ensure that they were preserved to the proper pH. Cyanide samples should be preserved at pH 12, metals samples (dissolved and total) should be preserved to pH <2, total organic catibon should be preserved to pH <2, and sulfide should be preserved at pH 9. According to Table 5 in TR- 0006, phosphate and nitrate+nitrate samples should be preserved with sulfuric acid, but the anions samples had no preservative and were not filtered. Samples for nitrate+nitrite and total phosphorous determinations should be preserved with sulfuric acid to pH <2. Because sulfate is determined in the anions samples, it will be necessary to collect a separate sample for nitrate+nitrite and phosphorous. It is possible that samples with higher alkalinities may require more preservative to reach the desired preservation pH values. 3.0 SUMMARY AND ASSESSMENT OF ANALYTICAL ACTMTIES 3.1 Analytical Results The field parameters and analytical results are displayed in Tables 3 and 4, respectively. A discussion of any elevated concentrations or unusual results is provided below. RCG/Hagler, BaiUy, Inc.