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Fificatioil CONCLUSIONS AND RECOMMENDATIONS il physical characteristics under the proposed disposal area reveal a silty-ciay/clax�silt tyle__th very slow petmeabilitZ,_6ased onthe percolation testresults. This is due to thection of the embankment, which consists of finer grained spoils from the Brown Sandon and compacted during emplacement. However, the AG-CON_Equipment.husiness is gn_), hat can be considered a favorable structure. By distributing the effluent throughtor Chamber over the entire filter bed arca, the favorable characteristics of these clay soils.e structure itself. can be taken advantage of, such as: 1.Z Ammonium absor)tion, 2.) bic microsites within the clay latticereventing nitrification and promoting denitnftcation..ury nitrification that has occurred. 3.) Unsaturated flow conditions. 4 ) Substantt,tll) incrs:asmg S the distance between the soilleftluent interface and the depth to groundwater, and �Urcaler r zlikelihood o(puthgjen destruction to prevent cut3tmnmatiott of the Iatic�Consideration may he given to constructing the 10FI� replacement area sinwltaneous with the primary field in the event the disposal areas need to rest and rehabilitate at some point in the future. calculationsindicateindicate an effluent concentration that is below the MCL for The nitrate loading ca 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 he immeasurable. There. should be no. or vct'v 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 ad .Tegete hasc_(.AB) currently on the surface of the embaL*ment must be removed and the underlying infiltration sui face must be scored with the backhoe teeth before irihhralor 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 Reusel. 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 he 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. 11' irrigation is needed during the hottest summer days,the irrigation system should activate several times for short durations. Mitt oxen ler till er should not be cyr/died to the filter bed Yrncr eruu+ul corer area. Page -9- Chesney Coersalti'19