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Soil Suitability and Nitrate Loading Study PINA PROPERTY 11560 West Clover Road, Tracy, California 1.0. INTRODUCTION AND PROPOSED DEVELOPMENT Advanced GeoEnvironmental, Inc. (AGE) has prepared this Soil Suitability and Nitrate Loading Study for the property located at 11560 West Clover Road, Tracy, California (site). 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 mobile home and 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, review of published soil and groundwater information, local septic use and permit research, and an estimate of 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, existing and planned septic systems, and an out of service domestic water well are illustrated in Figure 2. 1 .1. DESCRIPTION OF SITE The location of the site, surrounding properties and general setting is illustrated on the Union Island topographic map, 1978 (7.5 Minute United States Geological Survey (USGS) Topographic Series, California). The site is located in the southern half of Section 20, Township 2 South, Range 5 East, Mount Diablo Base and Meridian (Figure 1). The map shows the property located at an elevation of approximately 17 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 north. The property is located on the south side of West Clover Road, approximately 0.25 miles east of the intersection of West Clover Road and Corral Hollow Road, Tracy, California. The site consists of a 1.16-acre parcel identified as San Joaquin County Assessor Parcel Number (APN) 212-260-22. The current zoning of the property is residential. The existing , structures on the site include an 1,862-square foot house, an approximately 300-square// foot shed, and an out of service domestic water well. Potable water at the site is provided by the City of Tracy. 1.2. DESCRIPTION OF PROPOSED DEVELOPMENT The proposed development will include addin an approximately 1,500 square foot mobile home in the northwestern portion of the site. Additionally, a[w septic system will be instilled and connected to the mobile home in the western portion of the property. The proposed locations of the mobile home and new septic system are depicted in Figure 2. No additional development is proposed for the property.