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Soil Suitability and Nitrate Loading Study LEON PROPERTY 228 Klo Road, Lathrop, California 1.0. INTRODUCTION AND PROPOSED DEVELOPMENT Advanced GeoEnvironmental, Inc. (AGE) has prepared this Soil Suitability and Nitrate Loading Study(Study) for the property located at 228 Klo Road, Lathrop, 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 addition of a residence, septic system, 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. The scope of work included a soil percolation test, groundwatersampling of the onsite 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 locations of the percolation test hole, the domestic water well, and the existing septic system, 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 Lathrop topographic map (7.5 Minute United States Geological Survey (USES) Topographic Series, California). The site is located in the southwestern portion, of Section 14, Township 1 South, Range 6 East, Mount Diablo Base and Meridian (Figure 1). The map shows the property located at an elevation of approximately 10 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 southwest. The property is located on the south side of Klo Road, approximately 1,500. feet west of the intersection of Klo Road and Manthey Road, Lathrop, California. The site consists of a 1.61-acre parcel identified as San Joaquin County Assessor Parcel Number(APN) 191- 240-180. The current zoning of the property is single-family. residential. The existing structures on the site include a 1,434-square foot house, an approximately 360-square foot detached garage, and a domestic water well. The property is provided potable water from the existing domestic water well located on the site (Figure 2). 1.2. DESCRIPTION OF PROPOSED DEVELOPMENT The proposed development will include adding an approximately 1,620 square foot residence and septic system in the southeast portion of the site. The new septic system is proposed to be installed in the southeast area of the site and will be connected to the