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U <br /> assessed carefully. First, ammonium in high concentrations can be toxic to plants under certain <br /> conditions in which the ammonium ion can be hydrolyzed to ammonia. If the landscape plants <br /> show signs of stress, this may be the reason. Secondly, root systems can infiltrate the leachlines <br /> and cause failure. Fertilization of the lawn and landscape plants should be done carefully and <br /> only after demonstrated need for nitrogen. Slow release nitrogen fertilizers should be used. <br /> Without sophisticated groundwater monitoring over a long period of time, it is unknown as to the <br /> exact groundwater depth at different times of the year, and the groundwater directional flow. <br /> However, sufficient data has been collected and analyzed to determine that the water table is <br />! currently an acceptable distance below grade for there to be adequate biological treatment, <br /> according to published scientific literature. _ <br /> Mounding effects under the leachfield areas may be of a concern in the spring when the facility <br /> reopens. Under severe climactic stress and heavy wastewater flows, percolating effluent and <br /> rainwater may pool on top of the saturated zone, inducing a mound. <br /> The existing lake that has fish in it should not contribute nitrogen to the underlying groundwater <br /> in significant amounts. Normally, when there are high fish populations within a comparatively <br /> small volume of water, does nitrogen impact from the fish waste become a concern. This can <br /> occur with commercial "fish farms." <br /> Accurate "as-builts" of the septic system installed.must be supplied to the Environmental Health _ <br /> Department and all applicable "distance" requirements must be followed. This ensures that the <br /> Health Department can make the proper modifications, if needed. <br /> E <br /> 10 <br /> Va.Cley Ag Research <br />