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f. e <br /> For argument sake, lets say there is 20 rng/l getting to the ground water. This is <br /> equivalent to 250 pounds of nitrogen in the million gallons added to the drainfield per <br /> year. This 250 pounds is spread over .6 of an acre. (The application of nitrogen to <br /> lawns is on the same order of magnitude,) The nitrogen, of coarse, Is added in small <br /> amounts. If the water table is moving, then the nitrogen is diluted and levels of NO3 r <br /> would not be a problem. I would not expect nitrates to rise above drinking water <br /> standards. There Is a domestic well 100 feet south of the drainfield which could be used <br /> to monitor the nitrates. This well has not been studied for depth. Providing the well has <br /> the correct physical features, it could be sampled periodically for nitrates. It should be <br /> i <br /> sampled now to establish background levels. <br /> The proposed community system does nqt pose a threat to groundwater. The combination <br /> of irrigating street trees and drainfields will save irrigation water and return highly <br /> treated water to the ground water. <br /> f <br /> Signed <br /> Mike Smith <br /> MHM ENGINEERING STAM P <br /> Ii <br /> E <br /> i <br /> I <br /> I <br /> 10 <br />