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1 F CONCLUSIONS AND RECOMMENDATIONS rcolation rates obtained indicate a marginally.acceptable soil permeability with the bility decreasing as the soil becomes saturated. Effluent mana emand therefore design should be based on the permeability of the soil eventually reaching atlong erm appliccation TAR) of approximately 0.5 gals/ftZ/day due to biomat formation. It is imperative that a eplacement area be designated in the event a repair is needed or an additional system f installed. It may be a requirement of the EHD to install a flow meter on each new system. The nitrate loading study has demonstrated that a total of 77 people can occupy the three sub' � ,,parcels without theoretical nitrate overload. However it is to be emphasized that the number of, eo Ie 12er Parcel cannot exceed 23 60 days ner ear for the water supply to remain Otherwise the water su 1 will be considered a 1DUbIiC water supply. rivate. High elevation or shallow leachfields will take advantage of the indigenous clay soils that will promote denitrification. Therefore, filter bed disposal fields are recommended and should be should reduce nitrate impact to the calculated extent. However, leachlines within landscapeconsidered. The denitrification potential in combination with landscape plants in the leachfid areas eld should be assessed carefully. Ammonium in high concentrations can be toxic to plants under certain conditions whereby the ammonium ' is hydrolyzed to ammonia. Tf the landscape plants show signs of stress, this may be the reason. Without sophisticated groundwater monitoring over a long period of time, it is unknown as to the exact groundwater depth at different times of the year, as well as the groundwater directional flow. However, sufficient data has been collected and analyzed to determine that the water table is currently an acceptable distance below grade for there to be adequate biological treatment, according to published scientific literature. Mounding effects under the leachfield areas may be of a concern since the saturated zone is at comparatively shallow depth. Under severe climactic stress and heavy wastewater flows, percolating effluent and rainwater may pool on top of the saturated zone, inducing a mound. Accurate "as-builts" of the septic systems to be installed in the future must be supplied to the Environmental Health Department and all applicable "distance" requirements must be strictly followed. ll Vaffey Ag research