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ADF of 40 gpd _ 0.1 gals/sf/day = 400 sf of filter bed area needed to manage the extremely low ADF of 40 gpd. The filter bed is to be constructed 40 ft N -S and 10 ft E -W, as illustrated on the design plans. There is ample area for the 100% reserve replacement area, which has been situated directly north of the primary filter bed location, also illustrated on the design plans. V. CONCLUSIONS NLS§ 4.2, SSS§ 6.7, SSS§ 5.4, 6.8. Soil compaction, along with a high magnesium content soil, have contributed to a failing percolation rate. Consequently, the proposed OWTS for this project must be an engineered system. The effluent flow volumes are anticipated to be extremely small. Although calculations have been presented illustrating potential maximum use of the Restroom, if it is determined in the future that flows are heavier than predicted and the filter bed fails, the replacement area must be enlarged. If this procedure is done, the additional area must be reconstructed with engineered fill to alleviate the soil compaction/magnesium content. NLS§ 4.1. The nitrate loading calculated for the original Studies found the nitrate impact to be 2.74 ppm as nitrate -nitrogen (NO3-N); 12.3 ppm as nitrate. This Addendum Study found the impact to be 0.121 ppm as nitrate -nitrogen (NO3-N); 0.537 ppm as nitrate. Therefore, the nitrate -nitrogen impact produced on, and emanating from the subject Parcel is 2.86 ppm; 12.73 as nitrate; well below the Federal nitrate -nitrogen Maximum Contaminant Level (MCL) of 10 ppm NO3-N, or 45 ppm as nitrate. This low nitrate impact potential is due to the large Parcel area of 145.91 acres. In quantifying nitrate loading, a well-defined area that has a nitrogen source, or sources must be defined. This is typically the APN Parcel under inquiry. Nothing is to be stored on, and no vehicles are to be driven over, or parked upon the septic tank and the filter bed. The filter bed must be barricaded to prevent this from occurring. -7- Chesney Consulting