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Soil Suitability and Nitrate Loading Study STOCKTON TERMINAL & EASTERN RAILROAD PROPERTY 1177 North Stokes Avenue, Stockton, 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 1177 North Stokes Avenue, Stockton, California (site). The purpose of this study is to determine the potential impact from nitrate loading due to the addition of a modular office building and future use of the property. The study included a soil percolation test, local septic use research and estimated nitrate impact to soil and groundwater at the site as required by San Joaquin County Environmental Health Department (EHD). The site and surrounding area are illustrated in Figure 1. A site plan depicting structures, the percolation test hole location, and existing 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, 1978 (7.5 Minute United States Geological Survey (USGS) Topographic Series, California). The site is located in the southern half of Section 54, Township 1 North, Range 5 East, Mount Diablo Base and Meridian (Figure 1). The map shows the property located at an elevation of approximately 30 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. The property is located at the termination of Stokes and consists of 3.01-acre parcel identified as San Joaquin County Assessor Parcel Number (APN) 143-280-01. The current zoning of the property is light commercial. The existing structures on the site include a small modular building located in the northeast corner and railroad tracks located across most of the property. Potable water at the site is provided by the California Water Service Company. 1.2. DESCRIPTION OF PROPOSED DEVELOPMENT A modular office building has already been constructed in the northeastern portion of parcel 143-280-01 and connected to the existing septic system. No additional development is proposed for the property. 1.3. PARCEL VICINITY LOCATION MAP San Joaquin County Assessor's Map Book 143 Page 28 depicts the site parcel (APN 148- 280-01) on the western portion of the page. The parcel is bordered to the east by APN 148-280-02 utilized by San Joaquin County; to the north by APN 101-240-13 and to the