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supported by any literature or industry practice that I am aware of. Woody/organic material <br />is used to remove nitrate from effluent that has already passed through a nitrification process, <br />such as a sand filter or aerobic treatment unit; i.e., in a two-step process. The proposed plan <br />to use organic material to create a heavy anaerobic organic layer on the bottom of the filter <br />bed will accelerate the sealing/clogging of the soil infiltrative surface, and interfere with the <br />absorption and percolation of wastewater. This is counter-productive to the primary purposes <br />of a septic drainfield which depends on an aerobic soil interface for breakdown of biological <br />matter and bacteria. There is a high likelihood it will lead to premature failure of the filter <br />bed. <br />Unless the designer can supply supporting technical literature and case study examples) to <br />validate this approach, I recommend against approval of this mitigation approach. Instead I <br />recommend a nitrogen removal system capable of 50% nitrogen removal be incorporated into <br />the OWTS design for this project. Per my revised nitrate loading calculations, a 50% <br />reduction in effluent nitrogen concentration would be adequate to bring the nitrate -nitrogen <br />level down to an acceptable level (<10 mg-N/L). An acceptable system would be one with <br />NSF/ANSI 245 certification, of which there are many to choose from. <br />