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19 <br /> Effluent toxicity problems were noted in the Durham Farrington Road Wastewater <br /> Treatment Plant, but these appear to have been resolved. These assessments <br /> also identified several synthetic organic chemicals in Jordan Lake at <br /> concentrations that were well below levels of concern for finished drinking <br /> water. One set of samples indicated the presence of significant levels of <br /> methylene chloride. However, this was considered to be an anomaly that <br /> resulted from analytical error associated with widespread use of methylene <br /> chloride in the laboratory. This report advocated the concept of segmenting <br /> Jordan Lake into the Haw River Arm and the New Hope River Arm for the purpose <br /> of assessing water quality. It was pointed out that the New Hope River Arm <br /> compares with Falls Lake, an existing water supply, with respect to the <br /> influence of urbanization and point source discharges. Overall , the report <br /> concluded that "all available data indicate that Jordan Lake is suitable as a <br /> water supply. " <br /> Based on these reports, available evidence indicates that Jordan Lake <br /> can be treated to achieve present drinking water standards. However, the <br /> limitation of available data should be recognized. It should be understood <br /> that questions remain with respect to possible future standards and concerns <br /> that exist for water quality characteristics that are not now regulated. The <br /> future possibility of additional treatment requirements must be considered, <br /> especially in the case of organic compounds which have not been fully examined <br /> or which cannot be identified within the limitations of existing technology. <br /> Additionally, because of concerns for point source discharges to the Haw River <br /> arm and the possible influence of this arm on water quality in the New Hope <br /> arm, Jordan Lake is likely to continue to be exposed to a greater degree of <br /> questioning relative to overall acceptability as a source when using <br /> conventional water treatment processes. <br /> f <br /> Costs for additional treatment of raw water from Jordan Lake have been <br /> included in the project costs shown in Table 6. 1 . Additional treatment costs <br /> are based on granular activated carbon treatment. It is assumed that this <br /> treatment would only be applied to raw water obtained from Jordan Lake, which <br /> would require the operation of parallel treatment trains at the County' s water <br /> treatment plants. Granular activated carbon treatment improves the quality <br /> and safety of drinking water by removing many organic compounds not removed by <br /> 6-8 <br />