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Soil Suitability and Nitrate Loading Study THREE B'S TRUCK AND AUTO PLAZA 14749 Thornton Road/Pennant Drive, Lodi, 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 14749 Thornton Road/Pennant Drive, Lodi, 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 restrooms and showers to the existing building 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. Site plans depicting structures, the percolation test hole location, septic tank locations, and the proposed improvements are illustrated in Figures 2 through 4. 1.1. DESCRIPTION OF SITE The location of the site, surrounding properties and general setting is illustrated on the Terminous topographic map (7.5 Minute United States Geological Survey (USGS) Topographic Series, California). The site is located in the southeast quarter of Section 11 , Township 3 North, Range 5 East, Mount Diablo Base and Meridian (Figure 1). The map shows the property located at an elevation of 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 west-southwest. The property is located adjacent to Interstate 5, approximately five miles west of Lodi, California and approximately 300 feet south of the intersection of Thornton Road and California State Highway 12 (Kettleman Lane). The site consists of a 4.45-acre irregular-shaped parcel identified as San Joaquin County Assessor Parcel Number (APN) 055-150-26. The current use type of the property is automotive uses, and the current zonin is not listed. The subject property is occupied by Three B's Truck & Auto Plaza at 14749 North Thornton Road, Lodi, San Joaquin County, California. The property is presently utilized as a Sinclair fueling station, minimart, and truck stop. The site has been utilized for commercial fueling since approximately 1981. The site is provided potable water from the San Joaquin County municipal water system (Figures 2 through 4). T, 1.2. DESCRIPTION OF PROPOSED DEVELOPMENT The proposed improvements will include remodeling an existing office inside the site building to add three restrooms and two showers. A 6,400 ft3 sump (20' x 40' x 8') will be