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• Nitrate nitrogen concentrations exceeded the interim limitations in three of the <br /> nine Crossroads wells (KMW-2, KMW-3, and KMW-4). The nitrate <br /> concentration in well KMW-3 was the highest ever observed in this well. Well <br /> KMW-4 is located upgradient of all land application sites and storage ponds, <br /> and the WDRs note that high nitrate concentrations in well KMW-4 existed <br /> prior to disposal of recycled water on Land Application Site 3. The <br /> exceedances in this well are therefore believed to be due to background <br /> groundwater conditions. Results from future monitoring events will be used to <br /> determine if the nitrate concentrations detected in KMW-2 and -3 are <br /> representative of groundwater conditions or are temporary aberrations. <br /> • Total Kjeldahl nitrogen and ammonia concentrations in the sample from KMW- <br /> • exceeded the interim groundwater limitations. The concentrations of both <br /> constituents were within the historical range of observations. Because KMW-6 <br /> is located upgradient of all land application sites and storage ponds, the <br /> exceedances at this well are believed to be due to background groundwater <br /> conditions. <br /> Table 7 provides a detailed comparison of each parameter and constituent to their <br /> corresponding interim groundwater limitations. As discussed above, most if not all <br /> of the exceedances are likely representative of background groundwater quality <br /> conditions. However, as recommended by the BPTC Work Plan, further study <br /> should be performed to better understand background groundwater quality in <br /> order to confirm this conclusion. <br /> - 15 - <br />