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Status Report Robinson Seep Investigation <br />Climax Molybdenum Company <br />The major ion chemical data for each of the wells, Robinson Lake, and the Robinson Lake <br />Seepage are plotted on Piper Diagrams, included as Figure 2.5, utilizing data from September <br />2013. The distribution of the data points indicates distinct chemical classes for water collected <br />from Robinson Lake and Robinson Lake Seep (high sulfate, calcium and magnesium), EVMW- <br />1 S and EVMW -1 D (lower sulfate, calcium and magnesium) and EVMW -004 (minimal sulfate). <br />Throughout the monthly sampling period from April 2013 to November 2013 the individual <br />locations have shown little variation in relative concentrations and their position within the <br />diagram. <br />Tetra Tech, Inc. November 2013 17 <br />