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Page 4 <br /> proposed leach field area so that the bottom of the leach lines will be at least 3.0 feet above the <br /> estimated average ground water elevation of 5.0 feet. Two inches of gravel was placed in the bottom <br /> of the percolation test hole. A 3 inch diameter perforated pipe was then placed in the hole and <br /> backfilled with gravel. The test hole was filled with water 24 hours prior to running the tests. The <br /> last half hour of the test readings were witnessed by a county health official and the test data <br /> obtained is enclosed in the appendix. The percolation rates have been adjusted to account for the <br /> gravel and pipe backfill. Calculations for adjustments are on the test data sheets. <br /> A summary of the test results is presented next: <br /> Diameter of Depth of <br /> Test No. Hole in. Hole ft. Percolation Rate (min/in) <br /> PT-1 8 24 23 <br /> VII CONCLUSION <br /> Based on the results of the percolation tests,the soil profile,and the performance of the septic <br /> systems in the area, it is our opinion that the proposed septic system planned for the golf course <br /> clubhouse should be suitable for its intended use as an on site sewage disposal systems.. <br /> Recommended systems should include shallow leach lines. San Joaquin County Environmental <br /> Health Division requires shallow leach lines to be placed 3 feet below ground level with a minimum <br /> clearance of 3 feet above average estimated ground water elevation. Therefore,as stated in the our <br /> geotechnical investigation, dated July 5, 1994, it is expected that 1 foot of fill will be placed in the <br /> vicinity of the proposed leach field to establish at least 3 feet of clearance between the bottom of the <br /> leach lines and the estimated average groundwater elevation of 5 feet below ground level. Any <br /> proposed system should be properly designed and installed according to current San Joaquin County <br /> criteria. <br /> Due to the size of the parcel, 63 acres,it is our opinion that the installation of the proposed <br /> septic system,if properly installed,should not adversely affect the quality of the ground water in the <br /> area. <br /> VIII LIMITATIONS <br /> The conclusions of this report are based on the information provided regarding the existing <br /> and proposed development, the use of the subject property, and the site conditions as they existed <br /> at the time we excavated our test holes and performed the percolation tests. It was assumed that the <br /> ?pERSO <br /> P N <br /> D N <br /> Z w <br /> O � <br /> P <br /> 9SSOC� <br />