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[7] CONCLUSIONS <br /> The results of the percolation tests indicate that there is a <br /> medium fast percolation of the shallow test boring on Parcel No. l <br /> at 20 min/in. However, the DR indicated a much faster percolation <br /> rate in the shallow test boring at 4 . 3 min/in. The distance <br /> between these two percolation test was approximately 1000 feet. <br /> Therefore, significant percolation rate differences can be observed <br /> within this relatively short distance. <br /> It is recommended that the firm installing the septic system be <br /> aware of the potential differences in soil structure, and to <br /> compensate for any soil discrepancies by the use of engineered <br /> backfill, or a larger leach field area. <br /> As noted above, the water table is approximately 20 feet below the <br /> soil surface. Therefore, the groundwater level in this area is <br /> below the five foot minimum distance between the bottom of the <br /> leach field, and the highest anticipated depth to groundwater, as <br /> of the date of this report. <br /> Based upon the documented information from the percolation testing <br /> procedures and the highest depth to groundwater, the proposed <br /> septic system should not produce additional nitrate contamination <br /> of the underlying groundwater. Since the subject property is not <br /> subject to flooding, there should be no adverse impact to surface <br /> - waters. <br /> 5 <br /> E '�Uality (vontrol Inspection <br />