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have not yet been defined, the background groundwater quality study <br /> performed at the nearby WRP-1 MBR plant would suggest that these <br /> exceedances are at least partially the result of background groundwater <br /> conditions. While the manganese concentration in well W-1 was the highest <br /> concentration observed in this well, subsequent quarterly sampling results are <br /> needed to determine whether the concentration increase is statistically <br /> significant. <br /> • Nitrate nitrogen concentrations exceeded the interim limitations in three of the <br /> nine Crossroads wells (KMW-3, KMW-4, KMW-6). Because well KMW-6 is <br /> located upgradient of all land application sites and storage ponds, the <br /> exceedances in this well are likely due to background groundwater conditions. <br /> High nitrate concentrations in well KMW-4 existed prior to disposal of recycled <br /> water on Land Application Site 3 as noted in the WDRs. The exceedences in <br /> this well are therefore likely due to background groundwater conditions. The <br /> nitrate concentration in KMW-3 exceeded its previous historical maximum <br /> concentration and was greater than the typical concentrations observed in <br /> samples from this well. If this concentration is confirmed by subsequent <br /> quarterly sampling results, further evaluation of this well will be required to <br /> determine potential causes for this concentration increase. <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 their historical ranges. Because KMW-6 is located <br /> upgradient of all land application sites and storage ponds, the exceedances at <br /> this well are likely due to background groundwater conditions. <br /> Table 7 provides a detailed comparison of each parameter and constituent to the <br /> interim groundwater limitations. As discussed above, most if not all of the <br /> exceedances are likely the result of background groundwater quality conditions. <br /> However, as recommended by the BPTC Work Plan, further study should be <br /> performed to better understand background groundwater quality so that this <br /> conclusion can be confirmed. <br /> - 15 - <br />