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The orientation of the four leachfields are in a triangular shape and this area is calculated to <br /> be 120,000 sq ft. The total weight of the groundwater under this area, assuming 100 ft <br /> thickness, is 339,564,234 kg, Therefore, the yearly impact of NO3-N concentration is 546 <br /> 340 =.1.6 ppm or 1.6 mg NO3-NIL. <br /> It must be stressed that the above calculations do not take into account several factors that in <br /> all probability, will attenuate nitrate formation and impact. These factors include groundwater <br /> flow which will produce a dilution effect in the mixing layer, the denitrification process, <br /> effluent treatment, and the use of effluent as landscape irrigation for uptake of NO3 and NH4 <br /> ions. <br /> 12 <br /> vaffey Ag Rssearch <br />