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Generally the surface soils consisted of a clay and hard pan. As shallow percolation <br /> tests proved adequate for conventional septic systems, no further soil exploration was <br /> necessary. <br /> The two percolation tests were performed in holes varying from 9 inches to 10 inch <br /> diameter by 36 inch deep backfilled with 3 inches of gravel. Both holes were filled with water <br /> 24 hours prior to running the test. The test hole for Parcel 1 was performed under a 4 hour <br /> test. The test hole for Parcel 2 was performed under a 1 hour test due to water remaining in <br /> the test hole after a 24 hour soaking period. The last half hour of the tests readings were <br /> witnessed by a County Health Official and the test data obtained is enclosed in the Appendix. <br /> Parcel Number Percolation Rate <br /> l 2 inches/hr <br /> 2 3 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 homesites resulting from the proposed parcel split of the subject <br /> property are suited for a typical on-site sewage disposal system. The proposed system, <br /> however, should be properly designed and installed according to the current San Joaquin County <br /> criteria. <br /> It should be noted that the location of each of the percolation tests was chosen near the <br /> existing disposal field. <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 any new proposed septic systems, if properly installed, <br /> should not adversely affect the quality of ground water in the area. <br /> -2- <br />