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Project: Gold Hill Mill LSR No: R8090117 <br />Case Comments <br />Total Mercury <br />Analyst: Jack Sheets <br />Introduction: <br />Certificate of Analysis <br />Two sediment samples were received for mercury analysis on 07-07-2009. All sediment samples were dried at 60 <br />C. Sediment results are reported as dry weight. Percent solids results are included to allow calculation to wet weight. <br />Digestion Methods: <br />Soil samples for total mercury were prepared using EPA Region 8 laboratory SOP 208, "Determination of Mercury <br />Using the Nippon MA 200 Direct Hg Analyzer," and EPA method 7473 in SW-846 Test Methods for Evaluating Solid <br />Waste, January 1998, revision 0 (thermal decomposition and atomic absorption spectrophotometry). <br />Analytical Methods: <br />Soil samples for total mercury analysis were analyzed using EPA Region 8 laboratory SOP 208 and EPA method <br />7473. <br />Quality Control Notes: <br />Routine sample quality control results such as matrix spikes and laboratory duplicates are reported on the quality <br />control pages of this report. Certain of the reported QC criteria may not be applicable. For example, duplicate analysis <br />RPD does not apply if the sample result is less than five times the reporting limit. Matrix spike control limits do not <br />apply if the sample concentration is four times the amount of spike added. Serial dilution analysis RPD does not apply <br />if the original sample concentration is less than 50 times the reporting limit. QC results that meet these criteria may be <br />reported on the QC summary page but should not be evaluated. Applicable QC results not within control limits are <br />discussed in the analyst notes section. Instrument quality control results, such as continuing calibration verification <br />(CCV), continuing calibration blanks (CCB), initial calibration verification (ICV), initial calibration blank (ICB), and <br />instrument blanks (IBL), were within QC criteria unless stated in the analyst notes section. <br />Analyst Notes: <br />No difficulties or unusual circumstances were encountered during these analyses. <br />SPLP Metals <br />Analysts: Jack Sheets and Michael Bade <br />Introduction: <br />Two sediment samples were received for SPLP extraction and metals analysis on 07-07-2009. The samples were <br />held until a decision was made regarding re-sampling within the 28 day holdng time for mercury. The decision to <br />analyze the samples outside the 28 day holding time for mercury instead of re-sampling was made by the Poject <br />Manager. The extraction was performed on August 4, 2009. <br />Preparation methods: <br />The samples were extracted using EPA Method 1312, Synthetic Precipitation Leaching Procedure (SPLP), <br />September 1994. <br />8907007 FINAL 09 04 09 1617 <br />Page 2 of 16 <br />Print Date : 04-Sep-2009