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w Septic permit applications have been researched and attached to the appendix of this report. All applications are for properties within the immediate area of the subject parcels. Predominantly, the septic systems consists of septic tanks, leach lines, and pits. Engineered systems have not been required in this area. V. GROUND WATER AND DEPTH TESTING FAccording to the map of "Lines of Equal Depth of Water Wells" published Fall, 1999, by the San Joaquin County Flood Control and Water Conservation District, the depth to groundwater at this location is approximately 70 feet. The gradient of ground water in the project area slopes east to west according to the F, map lines of equal elevation published in the spring of 1999 by San Joaquin County Flood Control and Water Conservation District. (See Appendix). Water samples were taken from the spigot at the office and analyzed for nitrates and DBCP. Samples were taken by Mike Toy of Dillon & Murphy on January 13, 2004. These samples were taken using the criteria of Precision Enviro-Tech. The samples were transported via automobile to Precision Enviro-Tech and released to them (see chain of custody Appendix). The nitrates were measured at 3.13 mg/l. The DBCP was F measured as non-detect. (See Appendix for results.) Areas of potential concern for ground water contamination consist of onsite storage for fuel, which in turn has a contaminant area around the fuel. However, based on water testing, potential for I contamination is very low. Vl. SOIL PROFILE AND PERCOALTION TESTS One test hole was excavated to a depth of 3.5 feet in the area of potential I homesite. The purpose of the test hole was to determinepercolation p p rate in this area. For approximation location of the test hole, see the Tentative Parcel Map in the Appendix. The hole was prepared in accordance with County Standards. The percolation hole was prepared on June 30, 2003. The presoak began on July 2 and the test performed on July 3, 2003. After 24 hour pre-soak the hole yielded no remaining water and the 4 hour test was run. Soils lithology in the general area of the test hole consisted of clay/loam. As shallow percolation tests did not percolate adequately for use of a conventional septic system, deep tests were performed by Neil O. Anderson & Associates. (See E Appendix) A copy of the Soils Classification Map prepared by the U.S. Department of Ag Soil Conservation Service is included in the Appendix. Their map classified the soils as clay loam. Due to this classification, there should be no potential problems to special engineering required on future septic systems. Fi 2 ' 1l