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i <br /> GROUNDWATER QUALITY OF THE AREA <br /> The compiled groundwater quality data were compared <br /> with Federal and State Applicable or Relevant and <br /> Appropriate Requirements (ARAR's) . The ARAR's were obtained <br /> from the Colorado Department of Health (1985) water quality <br /> numeric recommendations and standards. Table IX summarizes <br /> the ARAR's and water quality parameters which exceed <br /> applicable standards. <br /> Sulfate, iron, fluoride, pH, ROE and, manganese <br /> parameters were found to exceed applicable standards. <br /> Figure 19 shows the distribution of samples exceeding ARAR <br /> concentrations. With the exception of pH and ROE, the <br /> highest percentage of samples that exceed ARAR's are from <br /> Data Groups "B" and "C" . Over 60% of Data Group "C" samples <br /> and, 45 -` Data Group "B" samples exceed the ARAR's for <br /> sulfate concentrations. Additionally, the ARAR <br /> concentration for dissolved iron is exceeded by 36% of the <br /> samples from Data Group "B" . Thirteen percent of the Group <br /> "C" samples exceed the ARAR for fluoride. Over 82% of the <br /> j, <br /> samples from Data Group "A" exceed the applicable water <br /> quality standard for pH. All of the samples (groups "A" , "B" <br /> and "C") exceed the ARAR value (500mgj1) for ROE (TDS) . <br /> I <br /> 67 <br />