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Septic permit applications have been researched and included in the appendix of this report. All applications are for properties within one mile 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. Each parcel that is being created would be allowed to have two homes built on them by current zoning ordinance. V. GROUND WATER AND DEPTH TESTING According 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 100 feet. The ( j gradient of ground water in the project area slopes east to west according to the map of lines of equal elevation published in the spring of 1999 by San Joaquin County Flood Control and Water Conservation District. (See Appendix). Water 4 _ samples were taken from the spigot located at the house at 7066 Mobley Road and 61 analyzed for nitrates and DBCP. Samples were taken by Mike Toy of Dillon & Murphy on March 31 , 2004. The samples were taken using the criteria of Precision Enviro-Tech. The samples were transported via automobile to Precision � S) Enviro-Tech and released to them (see chain of custody in Ap endix). The nitrates J were measured at 10.7 mg/I. The DBCP was measured atg/L. (Seems) Appendix for results.) Based on water testing results, potential for contamination by creating these new parcels is low. VI. SOIL PROFILE AND PERCOLATION TESTS Sixteen test holes were excavated to various depths in the area of potential '5.2J homesites. Eight were deep tests and the other eight were shallow holes. The purpose of the test holes were to determine percolation rate in these areas. For _ approximate location of the test holes, see the Tentative Parcel Map in the Appendix. Neil O Anderson and Associates prepared and tested the percolation holes. The holes were prepared in accordance with County Standards. Soils lithology in the general area of the test holes consisted of Galt Clay. <53> A copy of the Soils Classification Map prepared by the U.S. Department of l / Ag Soil Conservation Service is included in the Appendix. Their map classified the soils as Galt Clay. Based on the percolation results, there should be no potential problems or special engineering required on seven of the future septic systems. Parcel 1 will require an engineered system unless an acceptable percolation rate can )r/ ,�F, be achieved when a building permit is applied for. l 2 ,_ C:\0396\SOILS REPORT 040603