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L November 3,2004 NOA Project Number: E040118A L6.7 Discussion of Percolation Test Results The soils within in Parcels 1,3, and 4 have demonstrated a satisfactory percolation rate in accordance with the requirements of the EHD. Parcel 2 did not achieve a satisfactory percolation rate due t2AI&ading water in the hole. The ground water depth below the ground surface was found to be approximately 4 feet re low`=heround surface. The existence of shallow ground water will require an mounded type engineered septic system to mitigate these conditions. L6.8 Discussion of Septic System Sizing Engineered septic plans for a mounded type septic system are provided to mitigate the shallow ground water conditions observed. The engineered septic system plans were stamped by a Civil Engineer and may be used for various sized residences should they ever be proposed for the parcels. l L 7.0 CONCLUSIONS In summary,the soils within Parcels 1,3, and 4 have demonstrated a satisfactory percolation rate in accordance with the requirements of the EHD. Parcel 2 did not achieve a satisfacercolation rate diem +� h.,a ,arer in�rhr der o ation t r h�lP- e ground water depth wasto found to be 1 P> approximately 4 feet below the ground surface and was observed to fluctuate slightly over several days. The existence of shallow ground water will require a mounded tvne_sentic system to mitigate these conditions. Plans for a mounded septic system are attached to this report. The soils of Parcel 2 did not demonstrate a satisfactory percolation rate in accordance with the requirements of the EHD.The standing water in the hole is most likely shallow ground water but could also be water from the presoak. We find the site suitable for development with the use of mounded septic systems. We do not anticipate that the ground water quality will be negatively impacted primarily due to the existence of peat and fine-grained soils. These conditions are favorable for the removal of nitrate from septic system effluent. 8.0 LIMITATIONS The conclusions of this report are based on the information provided regarding the existing and ` proposed development, the use of the subject property, and the site conditions as they existed at the time we excavated our test holes and performed the percolation tests. It was assumed that the test , holes and percolation test results are representative of the subsurface conditions in the general area. L L L10 L