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FThe NCLUSIONS AND RECOMMENDATIONS sical characteristics under the proposed disposal area reveal a silty clay/clayey silt type y slow permeability, based on thePercolation test results. This is due to the _ _.of the embankment, which consists of finer grained spoils from the Brown Sand operation and compacted during emplacement. However t_he AG-CON Equipment business is situated on what can be considered a favor le structure. By distributing the effluent through Infiltrator Chamber over the entire filter bed area, the favorable characteristics of these clay soils, and the structure itself, can be taken advantage of, such as: 1.) Ammonium absorption, 2.) itaerobic microsites within the clay lattices preventing nitrification and promoting denitrification dor anx nitrification that has occurred3.) Unsaturated flow conditions" 4.) Sustantially ins_ creasing ythe distance between the soil/efflue erf ce and the de th to groundwater, and 5 Greater _ _.nt-dna P ____ 9( likelihood of pathogen destruction to prevent contamination9f the lake. Consideration maybe given to constructing the 100%replacement area simultaneous with thejrimary field in the event the disposal areas need to rest and rehabilitate at some point in the future. ,\ iM-) T/gam, The nitrate loading calculations indicate an effluent concentration that is below the MCL for drinking water. Considering the lake will be the"sink" for the effluent that does reach the groundwater, the dilution effect will be substantial. In fact, the dilution should be so large as to be immeasurable. There should be no, or very little weight, to the west of the filter bed,between the west side of the bed and the beginning or heel of the slope. Loading in this area may cause slope failure if saturated soil conditions develop. The aggregate base (AB) currently on the surface of the embankment must be removed and the underlying infiltration surface must be scored with the backhoe teeth before Infiltrator Chamber installation. It is important to recognize that all septic systems and disposal areas have a lifespan. This lifespan is unpredictable due to the numerous operational and environmental factors involved. Operational factors include checking the toilet regularly to ensure there is no leakage. Environmental factors include biomat buildup that will occur at the soil/effluent interface within the chambers and a naturally occurring process illustrated on the attached schematic in Appendix D. (Adapted from Metcalf and Eddy: Wastewater Engineering- Treatment, Disposal, and Reuse). Biomat buildup is typically managed by allowing the filter bed to rest and rehabilitate naturally. If there are to be any food preparation inside the office, disposals or food waste grinders must not be installed. It is imperative that no chemicals, solvents or petroleum products, other than low concentrations of household cleaners be introduced into the septic system. The grass ground cover over the disposal areas will need irrigation during the spring and summer months. However, care must be given to the amount of water applied so as to not inundate the system. It is recommended to irrigate with"impact-type" sprinkler heads during the night. If irrigation is needed during the hottest summer days, the irrigation system should activate several times for short durations. Nitrogen fertilizer should not be applied to the filter bed Brass ground cover area. Page -9- Chesney Consulting