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VI. SOIL PROFILE AND PERCOLATION TESTS <br /> Four test holes were excavated to depths of 3.0 feet in the areas of the proposed <br /> homesites. The purpose of the test holes was to determine percolation rates in these areas. For <br /> approximate locations of the test holes, see the Tentative parcel Map in the Appendix. Holes <br /> were prepared in accordance with County Standards. <br /> Generally the surface soils consisted of a sandy loam. As shallow percolation tests proved <br /> adequate for conventional septic systems, no further soil exploration was necessary. <br /> All four percolation tests were performed in holes varying from 9 inchs to 10 inch <br /> diameter by 36 inch deep backfilled with 3 inches of gravel. All holes were filled with water 24 <br /> hours prior to running the test. The test holes for Parcels 1,2,3, and 4 were performed under a 4- <br /> hour test. The last half hour of the tests readings were witnessed by a County Health Official and <br /> the test data obtained is enclosed in the Appendix. <br /> Parcel Number Percolation Rate <br /> r <br /> 1 5 '/z inches/hr <br /> 2 6 inches/hr <br /> 3 2 inches/hr <br /> 4 13 inches/hr <br /> VII. CONCLUSION <br /> Based on the results of the percolation tests and the soil profile, it is Dillon & Murphy's <br /> opinion that the existing homesite and any new homesites resulting from the proposed parcel split <br /> of the subject property are suited for the construction of a typical on site sewage disposal system. <br /> " The proposed system, however, should be properly designed and installed according to the <br /> current San Joaquin County criteria. <br /> It should be noted that the location of each of the percolation tests was chosen as the most <br /> likely location for a disposal field. If the actual location of a proposed disposal field varies <br /> significantly from the test locations, the test data should not be considered accurate of other <br /> locations. <br /> Based on the depth to ground water in the area, and the size of the proposed parcels, it is <br /> our opinion that the installation of the proposed septic systems, if properly installed, should not <br /> adversely affect the quality of the ground water in the area. <br /> r <br /> -2- <br />