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Technical Memorandum: Evaluation of Deadman Gulch Background and <br />Lake Fork of the Gunnison Water Quality <br />Prepazed By: Gault Group Inc./Cortez, CO <br />Prepared For: Au Mining/Lake City, CO <br />Statement of the Purpose <br />The purpose of this TM was to review all available water quality data for two azeas; 1) Deadman <br />Gulch (the Gulch) background, and 2) the Lake Fork of the Gunnison (Lake Fork) within the <br />vicinity of the Deadman Gulch confluence, in order to determine if the Gulch is affecting the <br />water quality conditions within the Lake Fork. A variety of data sources were obtained and <br />reviewed as part of this process. The BLM in coordination with the EPA has conducted several <br />studies within 2007. LKA Int., and Au Mining have captured years of information as part of <br />DBMS permit procedures. Additional studies were completed by GGI in 2007 in order to gather <br />amore robust data set chazacterizing Deadman Gulch as a whole, and also to measure any <br />potential mixing zone footprint that may occur at the confluence (previously described within <br />Attachment A). This TM summarizes the methods and results of the water quality measurements <br />and characterization for Deadman Gulch (focused upon the background) and the Lake Fork. <br />Sources of Information <br />There were several sources of data obtained for the Deadman Gulch background and Lake Fork <br />of the Gunnison water quality characterization. These included data gathered by the Bureau of <br />Land Management in coordination with the Environmental Protection Agency (three data sets), <br />from the ongoing data collection as part of the Golden Wonder DBMS permit, and from the <br />Chemical Trace study defined earlier within Attachment A of this report. A description of the <br />sampling events completed for each source is as follows; <br />The BLM/EPA data sets evaluated include those provided to the public from the studies <br />completed on 04/18/07, 05/02/07 and 05/24/07. These data sets capture locations along <br />Deadman Gulch and the Lake Fork depending upon flow availability. Locations on the <br />Lake Fork were only provided within the 04/18/07 data set, while the Deadman Gulch <br />`background' or the headwaters location was evaluated within all three data sets. <br />Summary Tables of the Data aze provided (Tables 1, 2 and 3). <br />• Two locations along the Lake Fork of the Gunnison (above and below the confluence of <br />Deadman Gulch) have been analyzed as part of ongoing LKA Int. DRMS permit efforts <br />since 2004. A summary of the obtained data is provided in Table 4 by yeaz and location. <br />Deadman Gulch background was chazacterized as part of the Chemical Trace study <br />summarized in Attachment A. The data were provided within Table 1 of Attachment A <br />and within Table 4 of this Attachment. <br />Results and Discussion <br />The following provides a discussion of the water sample analysis results by source (BLM/EPA <br />etc.) and by location (Deadman Gulch background and Lake Fork of the Gunnison). <br />Page 15 of 16 <br />