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INTRODUCTION 7cTharsaacteristics ility Study presents the results of our investigation concerning the soil nd groundwater under the subject property referenced on the Title Page. Our studyo satisfy the requirements of the San Joaquin Environmental Health Department (EHD), specifically: 1.) To determine if the four homesite parcels that are proposed to be subdivided are acceptable for the proper operation of a septic system which will function as intended for its anticipated lifespan, and 2.)Provide analysis and recommendations based upon the environmental criteria encountered in this study. There is one domestic well and no irrigation wells on the subject property. The March 4, 2004 EHD Conditions of Approval, Item C, states that the domestic well is to be tested for the agrichemical DBCP. However, this requirement was waived by EHD staff since there was no agricultural production in this locale from 1970 up through 1976 that would have used DBCP. Therefore, only nitrate water testing accompanies this report. Our report is in compliance with the requirements for a Soil Suitability Study under Development Title Section 9-1105.2 Item(d) of the San Joaquin County Ordinance Codes. SUBJECT SITE AND STUDY AREA BACKGROUND INFORMATION The purpose of this project is to create four new parcels from a total area of 12.2 acres, and construct four single family residential structures. Each parcel area and orientations are denoted on the attached Tentative Map, found in Appendix A. Parcel 1 currently includes two single family residences, a shed and two barns. It is unlikely EHD would support second unit dwellings on proposed Parcels 2 and 3 since the acreage is to be 2.0 acres each. It is a possibility for Parcel 4. The subject property is near the small town of Peters, one-half mile north of Copperopolis Road on Hewitt Road. Surrounding property use consists predominately of low density single family residences,ranchettes,horse ranches, and other types of ag buildings. The subject property is currently zoned rural residential. Municipal sewer will probably never serve this area, or at least not for several decades. As depicted on the attached USGS Map and the Tentative Map,the topography of the site is 105 feet above MSL,with a slight land declination toward the southwest. Therefore, septic system design criteria for slopes do not have to be considered. A review of Application Permits on file with the Environmental Health Department reveals there have been 10 Applications for Repairs/Additions to septic systems on Hewitt Road exclusively, with six of these Applications for the subject property alone, as described: Supplementary drainage(seepage-pit) in 1962, another pit in 1964, replacement of system in 1966, addition of drain line and pit in 1977, replacement of old tank in 1992, and additional drain and pit in 1994. This high number of Repairs/Additions/Replacements can be attributed to the very poor on-site, and surrounding soils. The subject property is in an area designated as"Hardpan"by EHD's colored map denoting the various soil types and septic system requirements throughout the County. Therefore, since the water table is comparatively deep in this area at approximately 130 feet, and the fact that the shallow soil structure is typically poor for effluent management by leachlines, seepage pits are allowed to be installed, and almost always are in this area. Page-1- Chesney Consulting