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Page 2 of 2 <br />Sincerely, <br />(below) for station NF -3. Please comment on events /circumstances that may explain the <br />increase in the parameters for each site listed below. <br />a. Station NF -3 had an increase in eight measured parameters for the August 2010 lab <br />analysis. The most dramatic increase was zinc with 2,800 times its seven year August <br />average (2002 - 2009). The August 2010 value was 14 mg/1 compared to the seven year <br />August average of .005 mg/1. Other elements with noted increases are: cyanide — 4 <br />times its seven year average, boron — 13, chromium III — 2, chromium VI — 10, <br />selenium — 3, chloride — 10 and NO 13. The Division is aware that the NF -3 <br />monitoring location is on the North Fork of the Gunnison River down gradient from the <br />town of Somerset and many producing and inactive mine sites. <br />b. Station NF -1 monitors the water up- gradient on the North Fork of the Gunnison River <br />from the Elk Creek Mine. The increased parameters were documented in August 2010 <br />and compared to August data from 2002 -2009. Chromium VI was 10 times the seven <br />year August average, chromium III — 2, cyanide — 4, boron — 7, silver — 10, zinc — 3, <br />selenium — 3 and chlorine — 20. <br />c. Monitoring well BC -1 had a significantly increased quantity of arsenic, NO3/NO2 and <br />zinc for June and August of 2010 compared to previous year's data. <br />d. Monitoring well EC -14 had significantly increased quantities of NO dissolved <br />iron, zinc and arsenic for June 2010 compared to previous year's data. <br />e. Monitoring well EC -15 had significantly increased quantities of arsenic, NO3/NO2, <br />chloride, orthophosphate, dissolved iron and zinc compared to previous year's data. <br />f. Monitoring well SC -1 had significantly increased quantities of arsenic and NO3/NO2 <br />compared to previous year's data. <br />g. Monitoring well SC -3 had significantly increased quantities of arsenic compared to <br />previous year's data. <br />If you have any questions, please let me know. <br />Brock Bowles <br />Environmental Protection Specialist <br />cc: Sandy Brown (electronically) <br />