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Additives During the use of the water for waste disposal, nutrients are dissolved and microorganisms are introduced on the way to the treatment system. Once the liquid reaches the recirculating filter, over 99% of the BOD & SS are removed. The soil will remove the microorganisms and most of the nutrients. All the nutrients are removed or utilized by plants with the exception of nitrates. During the summer, they will be used b the trees and shrubs. However, during h Y g t e winter months they will travel vertically In the soil. The recirculating filter will remove half of the nitrates leaving a concentration of 30 mg/I in the effluent. As the liquid travels downward, three reactions can occur - 1) Plants and microorganisms can consume it; 2) Denitrification can occur turning it into nitrogen gas; and/or 3) Leaching can carry it to the water table. Recent studies on nitrate movement show that denitrification occurs in the portion of the soil that is dry in the summer, but is saturated in the winter. �R CESS The exact amount of nitrate getting to the water table is impossible to predict. We know y that no more than 30 mg/I of nitrogen (N-NO3) will enter the soil. (see Table 1) �LGac�/S When this 30mg/I of N-NO3 enters the soil it can be lost through denitrification. As the NO enters zones where there is little or no oxygen, the o 1 3 xyg oxygen attached to the N is used by organisms. The N is released as a gas. The amount of denitrification is site specific. r The well log for B-6 shows there is a grey clayey silt at 21 to 27 feet. (see attached log) The groundwater probably fluctuates in this layer. if this is true, a great deal of the nitrate could be lost due to denitrification. A conservative estimate of NO3 reaching the groundwater would be 20 mg/I. (This could be O if the correct soil conditions are I k encountered.) ` I 9