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Soil Suitability and Nitrate Loading Study GUTIERREZ PROPERTY 1901 Patterson Avenue, Stockton, California 1.0. INTRODUCTION AND PROPOSED DEVELOPMENT AdvancedGeo, Inc. (AGI) has prepared this Soil Suitability and Nitrate Loading Study (Study) for the property located at 1901 Patterson Avenue, Stockton, California (site or subject property). The purpose of this Study is to determine the potential impact from nitrate loading and the suitability of the subsurface for an onsite wastewater treatment system (OWTS) due to the proposed development of a residence and septic system at the site, and the future use of the property. The study was performed in accordance with the requirements of Section 9-1105.2(d) of the San Joaquin County Community Development Department (SJCCDD). The scope of work included a soil percolation test, review of published soil and groundwater information, local septic use and permit research, and estimated nitrate impact to soil and groundwater at the site. The site and surrounding area are illustrated in Figure 1. A site plan depicting structures, the percolation test hole location, and the planned locations of the proposed residence and septic system are illustrated in Figure 2. 1.1. DESCRIPTION OF SITE The location of the site, surrounding properties and general setting is illustrated on the Stockton East topographic map (7.5 Minute United States Geological Survey (USGS) Topographic Series, California). The site is located in the east portion of Section 84, Township 2 North, Range 7 East, Mount Diablo Base and Meridian (Figure 1). The map shows the property located at an elevation of approximately 45 feet above mean sea level in an area of low topographic relief. The regional slope of the area is relatively gentle and dips toward the west-southwest. The property is located on the west side of Patterson Avenue, approximately 600 feet north of the intersection of East Fremont Street and Patterson Avenue, Stockton, California. The site consists of a 0.228-acre rectangular parcel identified as San Joaquin County Assessor Parcel Number (APN) 089-091-080. The current zoning of the property is vacant and there are no structures on the subject property (Appendix A). Based on San Joaquin County Environmental Health Department (EHD) records and information provided by the property owner, an out-of-service domestic water well and pressure tank are located on the property. The well has a secure cap and both the well and pressure tank are useable. The well and pressure tank can be used to provide a potable water service to the property (Figure 2; Appendix B). 1.2. DESCRIPTION OF PROPOSED DEVELOPMENT The proposed development will include adding a small, two-bedroom residence and a septic system in the eastern portion of the site. The new septic system will be located to