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In addition to TDS, sodium, and chloride concentrations, the concentrations of the <br /> following constituents exceeded the interim limitations in one or more wells: <br /> • In the Second Quarter 2010, pH values exceeded the interim limitation in one <br /> of nine Crossroads wells (KMW-7). However, the pH value for well KMW-7 <br /> (8.94) was within the historical range of observations. The pH levels in this well <br /> have been consistently outside the typical pH range of the treated wastewater, <br /> indicating that the pH exceedances are likely the result of background <br /> groundwater conditions. <br /> • Coliform bacteria are widespread in the environment and occur in large <br /> numbers within soil. The test for total coliform includes all coliform organisms, <br /> not just those found in the human intestinal tract. Historical total coliform <br /> counts have been variable and erratic from well to well and quarter to quarter. <br /> In the Second Quarter 2010, total coliform exceeded the interim limitations in <br /> one of the nine Crossroads wells. The total coliform count in KMW-7 (1.1 <br /> MPN/100 ml) was within the historical range of observations. Although <br /> background coliform counts have not yet been defined for these wells, the <br /> background groundwater quality study performed at the nearby WRP-1 MBR <br /> plant would suggest that this exceedance is at least partially the result of <br /> background groundwater conditions and potential limitations with analytical <br /> reproducibility. <br /> • Boron concentrations exceeded the interim limitations in seven of the nine <br /> Crossroads wells. All concentrations were within the historical range of <br /> observations. Several Crossroads wells, including KMW-3 and KMW-7 located <br /> on Land Application Site 2, frequently exceeded the boron interim limitations <br /> even prior to the development and use of the sites. Therefore, most, if not all, <br /> of these exceedances are likely the result of background groundwater <br /> conditions. <br /> • Manganese concentrations exceeded the interim limitations in eight of the <br /> nine Crossroads wells. The manganese concentrations in all but one well <br /> were within the historical range of observations. The manganese <br /> concentration in well W-1 was the highest ever observed in this well. <br /> Although background manganese concentrations have not yet been defined, <br /> the background groundwater quality study performed at the nearby WRP-1 <br /> MBR plant would suggest that these exceedances are at least partially the <br /> result of background groundwater conditions. <br /> • The concentration of iron in well MW-5 exceeded the interim groundwater <br /> limitation. The iron concentration in this well is within the historical range of <br /> observations suggesting it is likely representative of background groundwater <br /> conditions. <br /> - 14 - <br />