Orange County NC Website
15 <br />!—� <br />7:7-1 <br />An example for determining the net size of a nitrification <br />field and length of line required by a treatment system would <br />be as follows: <br />A subdivision has 100 three bedroom houses; its nitrification <br />field has a waste loading capacity of 0.10 gallons per square <br />foot per day. The total waste load to the treatment system <br />would be 100 houses x 3 bedrooms x 120 gallons per day per <br />bedroom = 36,000 gallons per day total waste load. The size <br />of the field is determined by calculating <br />36,000 d = 360.000 square feet of net <br />0.10 gpd per square foot nitrification field <br />application rate treatment area <br />The length of line required would be determined by <br />calculating <br />360,000 sf 72,000 linear feet of <br />5 sf of field treated low pressure line <br />by one linear foot <br />of low pressure line <br />The calculations shown above give only the net size of a <br />nitrification field and the length of low pressure line to be <br />used in that field. The gross size of the nitrification <br />field is increased by requirements for a 100 percent repair <br />area and buffers, and by encountering areas within the <br />interior of the field that are unusable because of the need <br />to avoid trees or other surface problems. <br />If I may answer any other questions, please advise. <br />