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soil profile encountered in the test holes was similar to that <br /> which was encountered in the test pit . <br /> The test hole for the deep pit percolation test was also <br /> logged by a civil engineer. A description of each soil encountered <br /> is contained in the Appendix as Log of Deep Pit Percolation Test <br /> Hole . For approximate location of percolation test holes ( PT ) see <br /> Tentative Parcel Map in the Appendix. <br /> Both percolation tests were performed in 8 inch diameter test <br /> holes that had a 4 inch perforated pipe backfilled with pea gravel . <br /> Both holes were filled with water 24 hours prior to running the <br /> test . The last half hour of the tests readings were witnessed by <br /> a county health official and the test data obtained is enclosed in <br /> the appendix . <br /> A summary of the test results is presented next : <br /> Diameter of Depth of <br /> Test No . Hole ( in. ) Hole ( in. ) Percolation Rate (min/in) <br /> PT-1s 8 36 No Percolation <br /> PT-1d 8 300 2 . 1 <br /> There was no change in the water level of the shallow <br /> percolation test over the 4 hour time period of the test. Although <br /> it was anticipated that the surface soils would be very slow to <br /> percolate , the absence of percolation was probably due to the <br /> saturated condition of the surface soils as a result of the recent <br /> heavy rains . <br /> VII CONCLUSION <br /> Based on the results of the shallow and deep percolation <br /> tests , the soil profile, and the performance of the septic systems <br /> in the surrounding area, it is our opinion that the proposed two <br /> new parcels will be well suited for the use of a septic tank, leach <br /> line , and dry well ( 25 feet deep) sewage disposal system. Proposed <br /> systems however, should be properly designed and installed <br /> according to current San Joaquin County criteria. <br /> Based on the depth to ground water in the area, it is our <br /> opinion that the installation of the proposed septic systems , if <br /> properly installed , should not adversely affect the quality of the <br /> ground water in the area. <br /> P 0ERSO� <br /> 4 <br /> D � <br /> Z W <br /> O � <br /> gSsor\ <br /> P <br />