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Table 7. Summary of differences between environmental and quality-control samples for wells in the Fraser River watershed, 1998-2001. <br />[All water-quality constituents are in the dissolved form except for total coliform bacteria, MBAS (methylene blue active substances), and radon-222. Lowest rounding unit is equal to <br /> the magnitude of the least <br />significant figure reported by the U.S. Geological Survey National Water Quality Laboratory; NA, not applicable; ammonia, un-ionized ammonia [NHS1 plus ammonium [NH4`1; nitrate is nitrate <br /> plus nitrite] <br /> Number of replicate pairs with <br /> Number of Percentage of Percentage of Percentage of replicate pairs with inconsistency in <br /> <br />Constituent replicate replicate pairs replicate pairs replicate pairs concentration(s) <br />reporting concen- <br /> pairs with no within I lowest within 2 lowest less than the trations less than <br /> evaluated difference rounding unit rounding units laboratory the laboratory <br /> reporting level reporting level <br />Bromide 19 68 100 100 6 1 <br />Calcium 19 0 32 37 NA NA <br />Chloride 19 42 79 84 NA NA <br />Fluoride 19 84 100 100 4 0 <br />Magnesium 19 11 37 47 NA NA <br />Potassium 19 5.3 21 37 NA NA <br />Silica 19 16 32 32 NA NA <br />Sodium 19 37 74 79 NA NA <br />Sulfate 19 37 84 95 1 0 <br />Iron 16 100 100 100 15 0 <br />Manganese 17 59 59 59 10 0 <br />Ammonia 18 22 28 50 8 4 <br />Ammonia plus organic <br />nitrogen <br />Nitrite <br />Nitrate <br />Phosphorus <br />Orthophosphate <br />Dissolved organic <br />carbon <br />Total coliform bacteria <br />MBAS <br />Radon-222, total <br />15 93 <br />100 <br />100 <br />8 <br />0 <br />17 71 100 100 13 3 <br />18 22 44 56 1 0 <br />18 28 56 78 NA NA <br />18 28 67 89 NA NA <br />18 50 67 89 NA NA <br />6 100 100 100 6 0 <br />18 83 83 89 17 3 <br />6 0 0 0 NA NA <br />a <br />M <br />Z <br />v <br />M <br />M <br />en <br />fJ7 <br />CT7