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• <br /> <br />scs <br />November 23, 2005 <br />Dear Sir or Madam: <br />SGS North America, Inc <br />Minerals Services Division-Denver Branch <br />4665 Pans St. <br />Suite B-too <br />Denver, CO 80239 <br />I have completed the QuikTM' Response testing for test code 11 (48-hr, Acute, Non-Renewal, 20° C) <br />Fathead Minnow and test code 32 (48-hr, Acute, Non-Renewal, 20° C) Daphnia magna. Upon <br />completion I reported my results immediately to Environmental Resource Associates. I have enclosed <br />a copy of the Final Report so you may report the results to the EPA for your individual sites. <br />Upon review of the data from the initial run for test code 11 a data entry error was found for the final <br />calculation of the LC50. When the proper data was re-run the LC50 nearly matched the original <br />assigned value. However, I decided to continue with the QuikTM' Response to re-verify my methods. <br />Data entry will be monitored much closer in future testing. <br />As for test code 32, I suspect the original concentrate may not have been mixed thoroughly enough <br />resulting in skewed test results. <br />The Final Report results indicate both tests to fall in the "Acceptable" category and marks the <br />conclusion of this study. I thank you for your patience in this matter. Please don't hesitate to contact <br />me with any questions either via a-mail or phone through the information supplied below. <br />Sincerely, <br /> <br />Heath M. Smith <br />Biomonitoring Supervisor <br />SGS North America Inc-Denver Branch <br />Minerals Division <br />t-(303) 373-4772 <br />f-(303) 373-4791 <br />heath.smith a(~sos.com <br />J <br />