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17 <br /> Pumping Costs <br /> Pumping costs are based on an average daily flow of 10 MGD, with 5 MGD <br /> being drawn off at the NASA water treatment plant and the remaining 5 MGD <br /> being pumped to northern Orange County. It was assumed that the County' s <br /> water utilities would take advantage of the economy that would be achieved by <br /> increasing the pumping rates from existing sources to meet peak demands. It <br /> was further assumed that raw water would not be pumped from Jordan Lake during <br /> wet weather periods when the natural streamflow of existing sources would <br /> exceed the total demand. It is estimated that this practice would reduce the <br /> total energy costs by approximately half. <br /> Water Quality <br /> The water quality of Jordan Reservoir has received considerable <br /> attention since conceptual planning of the lake was initiated. These concerns <br /> were prompted by the large number of permitted point source wastewater <br /> discharges located upstream of' the lake. The North Carolina Division of <br /> Environmental Management (DEM) is conducting a continuous sampling and <br /> monitoring program to provide a history of the lake's development, as well as <br /> to monitor water quality. The COE has also conducted extensive sampling <br /> studies to define lake water quality. <br /> Water quality evaluations of Jordan Lake are summarized in the DEM <br /> Report, "Toxic Substances in Surface Waters of the B. Everett Jordan Lake <br /> Watershed and September 1985 Update" (March, 1985) . Important findings of <br /> this report are as follows: <br /> • Metals - In the past, concern has existed for levels of metals in <br /> tributary sources to Jordan Lake and associated effects on aquatic <br /> life. Data indicate that these levels appear to be declining, <br /> perhaps as a result of pollution control initiatives . Studies <br /> indicate that urban non-point source pollution is the predominant <br /> source of lead, copper, and zinc. This may also be the case for <br /> other metals. Metal levels in the lake are lower than those in the <br /> tributary inflows and in-lake standards are rarely exceeded, except <br /> 6-6 <br />