Laserfiche WebLink
IV. CONCLUSIONS AND RECOMMENDATIONS <br />NLS§ 4.1. The nitrate loading calculations show the effluent from the proposed project will <br />theoretically possess a nitrate-nitrogen concentration well below the Federal nitrate Maximum <br />Contaminant Level (MCL) of 45 ppm as nitrate or 10 ppm nitrate as nitrogen, and may actually <br />create a dilution effect to the underlying groundwater. A total nitrogen concentration equivalent to <br />domestic sources, as referenced in the scientific literature, was used in the loading calculations. <br />NLS§ 4.2, SSS§ 6.7, SSS§ 5.4, 6.8. The soils directly underlying the proposed leachfield area <br />show a rapid permeability, but permeability substantially decreases at the 8-ft depth. This may be <br />beneficial in creating anaerobic conditions at this 8-ft depth due to soil saturation and thus <br />promoting denitrification. By applying the effluent uniformly through leachlines laid level with <br />capped ends, will allow optimum effluent management by the receiving soils. <br />Although a smaller volume septic tank would have been appropriate, a large 2,000 gallon tank has <br />been specified for theoretical reduction in nitrogen concentrations in the effluent flowing from the <br />tank, and increasing leachfield longevity by retaining a higher percentage of particulate matter. <br />The effluent receiving soils possess a perc rate of 5.6 min/inch. This translates to an acceptance <br />rate of 0.800 gallons/ft2/day. Total lineal ft of leachline (LFLL) = 255. Therefore, the three <br />leachlines can manage: 4 ft2/LFLL x 255 LFLL = 1,020 ft2 x 0.800 gallons/ft2 /day = 816 gpd. <br />Nothing is to be stored on, and no vehicles are to be driven over the leachfield area. Consideration <br />should be given to installing bollards or safety barriers around the leachfield since there is <br />considerable truck traffic within the facility. <br />Page -9- <br />Chesney Consulting