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Parameter <br />Max of Shallow Wells (June <br />2014 Sample) + 25% (mg/L) <br />Max of Shallow Wells (July <br />2014 Sample) + 25% (mg/L) <br />Max of Shallow <br />Wells + 25% (mg/L) <br />Degrees C of pH measurement <br />2 6. 3 <br />26.25 <br />26.250 <br />Phosphorus, ortho dissolved <br />0.025 <br />0.0750 <br />0.075 <br />Potassium, dissolved <br />L50 <br />0.88 <br />1.500 <br />Residue, Filterable (TDS) @180C <br />212.5 <br />138 <br />212.500 <br />Residue, Non - Filterable (TSS) @105C <br />78 <br />221.25 <br />221.250 <br />Selenium, dissolved <br />0.0006 <br />0.00 <br />0.001 <br />Silica, dissolved <br />8.25 <br />6.5 <br />8.250 <br />Silver, dissolved <br />0.0001 <br />0.00 <br />0.000 <br />Sodium, dissolved <br />5.75 <br />2.5 <br />5.750 <br />Sulfate <br />78 <br />68.8 <br />78.125 <br />Sum of Anions <br />2.88 <br />2.1250 <br />2.875 <br />Sum of Cations <br />3.13 <br />2 <br />3.125 <br />TDS (calculated) <br />186.25 <br />136.250 <br />186.250 <br />TDS (ratio - measured /calculated) <br />2.03 <br />1.31 <br />2.025 <br />Thallium, dissolved <br />0 <br />0 <br />0.000 <br />Total Alkalinity <br />56.3 <br />40.75 <br />56.250 <br />Uranium, dissolved <br />0.0003 <br />0 <br />0.000 <br />Vanadium, dissolved <br />0 <br />0 <br />0.000 <br />Zinc, dissolved <br />_. 3S <br />0.4625 <br />0.538 <br />Zinc, total <br />Not Tested <br />0.9 <br />0.900 <br />Chapter 7 - Proposed Standards <br />Three different aspects were taken into account to develop the final proposed standards. These aspects include <br />a) the representative groundwater value determined from the sampling wells, b) the in- stream water quality <br />standard set by the methodology in the CDPHE discharge permit, and c) the CDPHE groundwater standards which <br />are used in some cases as a backup method to determine standards for parameters when the other methods don't <br />provide the information. <br />CDPHE In- Stream Standards <br />The methodology used to determine CDPHE discharge permit limitations was from CDPHE Regulation Number 35 <br />on stream classifications and water quality standards for the Uncompahgre River Basin, Stream Segment Number <br />9 [1]. These regulations are referred to as in- stream standards as they are specific to the stream segment <br />applicable to the Revenue Mine site. The values as defined in the numeric standards table for Regulation No. 35 <br />are shown below in Figure 4. <br />