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January 7, 1994 18 <br /> Mr. Alan K. Whitaker <br /> Piney Mountain Subdivision <br /> Title 15A of the North Carolina Administrative Code 2B .0200 elaborates on the issue of <br /> potential discharges into low flow streams. In cases where the 7Q10 flow, the average <br /> flow for seven (7) consecutive days in a ten (10) year period as reported by the United <br /> State Geological Survey(USGS), is zero,approval for a new discharge is dependent upon <br /> the 30Q2, the average flow for thirty (30) consecutive days in a two (2) year period, as <br /> follows: <br /> 1. Where the 30Q2 flow is estimated to be greater than zero, effluent limitations <br /> for new discharges of oxygen consuming waste will be set at BODS =5 mg/l, <br /> NH3-N=2 mg/1 and DO=6 mg/l,unless it is determined that these limitations <br /> will not protect water quality standards. <br /> 2. If the 30Q2 and 7Q10 flows are both estimated to be zero,no new discharge of <br /> oxygen consuming waste will be allowed <br /> Due to the statistical variability of these estimates, any 30Q2 flow estimate 5 0.05 cfs is <br /> considered to be zero by the division. <br /> Therefore, based upon the information contained in the letter prepared by Barrett Kays & <br /> Associates, and that the estimated 30Q2 flow is below 0.05 cfs, we are in agreement with <br /> the conclusions drawn by the consultant. <br /> If you have any questions regarding this matter,please do not hesitate to contact Mr. Steve <br /> Tedder,Chief of the Water Quality Section or me at(919)733-7015. <br /> Since ly, <br /> A. Preston Howard, Jr., P.E. <br /> cc: Office of the Attorney General-Mr.Jim Gulick <br /> Mr.Steve Tedder <br /> Ms.Nancy Essex <br />