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44 <br /> Barrett Kays & Associates <br /> Civil Engineering/Environmental Engineering/Environmental Assessment <br /> December 8, 1993 <br /> Ms. Deborah Christie <br /> c/o Piney Mountain Home Owners Association <br /> 5310 Taproot Lane <br /> Durham, NC 27705 <br /> RE: Preliminary Low Flow Stream Analysis <br /> Pine Mountain Creek <br /> Orange County, NC <br /> BKA Project #9311003 <br /> Dear Ms. Christie: <br /> On your request Barrett Kays &Associates, P.A. has conducted a preliminary <br /> low flow stream analysis for Pine Mountain Creek in Orange County, NC. <br /> Pine Mountain Creek, adjacent to the Piney Mountain Subdivision, has a <br /> drainage area of 3.5 square miles. We utilized the United States Geological <br /> Survey methodologies for estimation of low flows. These are the <br /> methodologies used by North Carolina Division of Environmental <br /> Management (DEM) for waste load allocations for wastewater discharge <br /> permits to surface waters. DEM requests flow calculations from USGS. Ms. <br /> Nancy W. Lasater, P.E. of our office worked with Mr. Robert Mason, P.E. of <br /> USGS in determining the low flow values. <br /> Using the regional equation methodology the 7Q10 is 0.00 cfs and the 30Q2 is <br /> 0.02 cfs. The 7Q10 is an estimated stream flow that would typically occur <br /> once every 10 years for at least 7-consecutive days. The 30Q2 is an estimated <br /> stream flow that would typically occur once every 2 years for at least 30 <br /> consecutive days. The USGS has previously completed a final flow analysis <br /> downstream at SR 1718 and their records showed a 7Q10 of 0.00 cfs. It was <br /> reported to DEM as no or zero flow under the criteria with DEM. <br /> DEM's regulations prohibit a discharge of treated wastewater into a surface <br /> stream where the 7Q10 flow is zero. However, the regulations allow a <br /> discharge if the 30Q2 flow is greater than zero and where the waste load <br /> allocation modelling can demonstrate that the discharge will not impair the <br /> water quality below the standards for the stream. <br /> 304 East Jones Street / Raleigh, North Carolina 27601 <br /> Telephone: 919-828-1903 Fax: 919-828-0365 <br />