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v <br /> unit dwelling. In other words, technically the 53 acres could have four home sites <br /> with four separate septic systems. <br /> V. GROUND WATER AND DEPTH TESTING <br /> According to the map of "Lines of Equal Depth of Water Wells" published <br /> Fall, 1999, by the San Joaquin County Flood Control and Water Conversation <br /> District, the depth to groundwater at this location is approximately 120 feet. (See <br /> appendix). <br /> The groundwater gradient map is included in the appendix. The gradient in <br /> the project area is descending in a northwesterly direction. <br /> 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 LITHOLOGY <br /> The general Iithology of the soil in this area is adobe and hardpan. The test <br /> holes taken in Parcel 2 were predominantly hardpan. The shallow test taken on <br /> Parcel 1 had a strata of adobe mixed with loam at 42 inches. The deep test <br /> encountered hardpan to 25 feet depth. The auger used by Anderson while <br /> preparing the holes was the source of visual observation of the Iithology. <br /> After reviewing records of other septics and pits in this vicinity, I would <br /> expect future septic systems to encounter hardpan. All records indicated that leach <br /> lines and pits have been used in the vicinity of the project. Since this report did not <br /> locate a strata with an acceptable percolation rate, a future system will require an <br /> engineered system unless a strata that percolates to Environmental Health's <br /> standards is encountered. <br /> VII. 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 /> 2 <br /> C:\0338\Soil Suitability Report 072203 <br />