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Soil Suitability and Nitrate Loading Study Addendum MENCHACA PROPERTY California State Highway 120, Ripon, California (APN: 203-220-76) 1.0. INTRODUCTION AND PROPOSED DEVELOPMENT Advanced GeoEnvironmental, Inc. (AGE) has prepared this Soil Suitability and Nitrate Loading Study Addendum (Addendum) for the property located at the intersection of California State Highway 120 and French Camp Road, Ripon, California (site or subject property). The Addendum was prepared to address comments in the San Joaquin County Environmental Health Department (EHD) letter dated 13 September 2019 (Appendix A). 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 addition of a residence, septic system, and 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. The scope of work included a soil percolation test, groundwater sampling of the adjacent domestic water well, 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, a domestic water well 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 Avena topographic map (7.5 Minute United States Geological Survey (USGS) Topographic Series, California). The site is located in the southeast portion of Section 33, Township 1 South, Range 8 East, Mount Diablo Base and Meridian (Figure 1). The map shows the property located at an elevation of approximately 70 to 75 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 northwest. The property is located on the north side of California State Highway 120 (ST RT 120), at the intersection of French Camp Road and ST RT 120, Ripon, California. The site consists of a 2.11-acre rectangular parcel, trending northwest-southeast, identified as San Joaquin County Assessor Parcel Number (APN) 203-220-76. The current zoning of the property is agricultural. There are no existing structures on the site and the site is currently covered with walnut and fig trees. The property is provided with water for agricultural purposes from the existing domestic water well located on the adjacent property at 17699 ST RT120.