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In reviewing files at the San Joaquin County Environmental Health <br /> Department office, it appears there is not groundwater contamination experienced <br /> in this area. The water results, discussed later in this report, show no signs of <br /> groundwater contamination in this area. <br /> VI. SOIL PROFILE AND PERCOLATION TESTS <br /> Two test holes were excavated to depths of 3.5 feet in the area of the <br /> homesite areas. One hole was excavated near the existing septic system, but did <br /> not disturb the existing system. The purpose of the test holes was to determine <br /> percolation rate in this area. For approximate location of the test holes, see the <br /> Tentative Parcel Map in the Appendix. The holes were prepared in accordance with <br /> County Standards. <br /> Generally the surface soils consisted of top soil underlain with a layer of hard <br /> pan. As shallow percolation tests proved inadequate deep(percolation tests were <br /> performed. (See discussion and results later in this report) <br /> Two shallow percolation tests were performed in holes 9 inches in diameter <br /> by 42 inches deep backfilled with 2 inches of gravel. There was standing water in <br /> the holes at the start of the test. The two holes were filled with water 24 hours <br /> prior to running the test. The test holes for Parcel 1 and Parcel 2 were performed <br /> under a 4 hour test. The last half hour of the test readings were witnessed by a <br /> County Health Official and the test data obtained is enclosed in the Appendix. <br /> Parcel Number Percolation Rate (Shallow Test) <br /> 1 N/A <br /> 2 240 min/in <br /> Deep tests were performed by Neil O. Anderson and Associates (Anderson). <br /> They also performed shallow tests. The soils Iithology, as noted in the test <br /> pit, is noted on the data sheet provided by the County (See Appendix). <br /> Future septic areas will most likely experience similar soil Iithology. A <br /> summary of Anderson's results is as follows: <br /> Percolation Rate Percolation Rate <br /> Parcel Number Shallow Test Deep Test <br /> 1 31 min/inch 125 min/inch <br /> 2 62 min/inch 85 min/inch <br /> 2 <br /> C:\0338\Soil Suitability Report 072203 <br />