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Varra Coal Ash Burial Project <br /> Weld County, Colorado <br /> CGRS Project No. 1-135-2755 <br /> Water Quality of Unconsolidated Alluvial Deposits <br /> Boulder - Fort Collins - Greeley Area <br /> Number of Number of Samples where <br /> Constituent Units Standard Range Samples standard was exceeded <br /> Dissolved Solids mg/L 500 53-6,570 178 161 <br /> Dissolved Arsenic ug/L 50 < 1-5 89 0 <br /> Dissolved Chloride mg/L 250 .4-1,100 295 2 <br /> Dissolved Fluoride mg/L 1.8 .2-5 145 12 <br /> Dissolved Iron ug/L 300 < 1-16,000 164 15 <br /> Dissolved Manganese ug/L 50 < 1-920 92 14 <br /> Dissolved Magnesium mg/L 125 1.9-510 170 30 <br /> Dissolved Nitrite (plus <br /> nitrate as nitrogen) mg/L 10 .00-73 289 43 <br /> Dissolved Selenium ug/L 10 < 1-100 94 15 <br /> Dissolved Sulfate mg/L 250 5.9-3,640 180 136 <br /> Hardness, as calcium <br /> carbonate I mg/L I None 1 31-3,540 1 177 1 N/A <br /> Hillier and Schnider, 1972. Well Yields and Chemical Quality of Water, Boulder-Fort Collins-Greeley Area, Colorado. <br /> US Geological Survey Miscellaneous Series, Map 1 855-1. <br />