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V. CONCLUSIONS AND RECOMMENDATIONS <br />SSS§ 5.4, SSS§ 6.7. The soils underlying the disposal area for the proposed modular home <br />exhibit acceptable permeability from the percolation test conducted. The soils actually possess <br />excellent permeability given the clay content, which is observed in Tracy area clay soils. From the <br />historical evidence of repairs/replacements/additions to surrounding onsite wastewater treatment <br />systems, longevity of the onsite system can be considered reasonable. <br />NLS§ 4.2. From the soil physical and chemistry test results, there is significant denitrification <br />potential within the soil environment due to the high organic matter and high clay content soil. <br />Significant denitrification potential has been observed in a project 2,650 ft to the south which <br />possesses the same soils as the subject property. <br />The nitrate loading calculations demonstrate that the SFR can be situated on the property without <br />exceeding the loading standards. Septic tank pump -out intervals should be every three to five years <br />to remove the nitrogen within the septage. <br />Accurate "as-builts" of the onsite wastewater treatment system should be supplied to the <br />Environmental Health Department. The leachfield area is not to be parked on or driven over. <br />It is imperative to recognize that all septic systems and disposal areas have a lifespan. This <br />lifespan is unpredictable due to the numerous operational and environmental factors involved. A <br />critical lifespan issue is controlling the on-site water use as much as possible. <br />Chesney Consulting <br />