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KLEINFELDER EXPECT MORE SOIL SUITABILITY AND NITRATE LOADING STUDY PILOT TRAVEL CENTER 10998 S. HARLAN ROAD SAN JOAQUIN COUNTY, CALIFORNIA ` 1. GENERAL L Kleinfelder is pleased to present the results of our soil suitability and nitrate loading study for the Pilot Travel Center located at 10998 S. Harlan Road in San Joaquin County, California. The Assessor's Parcel Number for the property is 193-330-30. An aerial photograph showing the approximate site boundaries is presented on Plate 1. The purpose of our study was to determine the suitability of the property for septic tank usage. The study was performed in general accordance with the requirements of Section 9-10100© of San Joaquin County Ordinance. The following sections include background information regarding the project site and the proposed development, past and present uses of the site, existing septic tank performance and permitting, and the r groundwater conditions in the project area. In addition, discussions regarding our investigative procedures and the site conditions encountered during our field exploration are included. Finally, the results of our percolation tests, nitrate loading calculations, and subsequent conclusions are presented. 2. SITE DESCRIPTION I PROPOSED DEVELOPMENT At the time of our study, the subject 23.64-acre parcel primarily consisted of a Kenworth semi-truck dealership in the western area and a fenced asphalt paved area reserved for truck and trailer parking in the center portion of the site. The dealership consisted of two structures and asphalt paved parking areas. To the east of the truck and trailer parking area was a relatively small fenced area that appeared to be used to stockpile and distribute soil. A retention basin was located in the southern area of the project site between the truck dealership and the parking area. The remainder of the project site consisted of a vacant field that was overgrown with weeds. Based on the presence of soil mounds and tire ruts, it appeared that the top soil of the vacant field had been moved around in the past. The property was bound to the north by various structures, asphalt paved parking areas, and a retention basin; to the immediate east by railroad tracks and S. McKinley Avenue beyond the tracks, to the west by S. Harlan Road; and to the south by Roth Road. The existing parcel is zoned I-G (General Industrial). An aerial photograph showing the existing developed components of the project site is presented on Plate 1. We understand that the existing truck and trailer parking area, the area used to .. stockpile soil, and the vacant field are proposed to be developed into a Pilot Travel Center. This development will consist of a McDonalds restaurant, a gas station with a ` store, a truck fueling station, and paved parking areas for public parking and semi- 82946.G01/ST07R401/SJW:Iv/Ir May 30, 2007 • ©2007 Kleinfelder Page 1 of 8