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I. INTRODUCTION This report issues our findings regarding the Nitrate Loading Study and Soil Suitability Study for the proposed WSP Trucking Facility. These studies are required by the San Joaquin County Department of Environmental Health(PHS-EHD) and comply with the San Joaquin County Development Title, specifically Section 9-1105.2(d). Mr. and Mrs. Bill Schwartz of WSP Trucking are the owners of the project. Preliminary information to complete these studies was provided by Schack& Company, Inc. of Tracy, CA. The site is located one-quarter mile east of Interstate 5 and directly south of the Highway 120 Bypass at the northeast corner of Madruga Road and Yosemite Avenue. The APN is 241-410- 36. The project is presently composed of 6.08 acres and eventually proposed to be 3.04 acres after the lot line adjustment. The project site will be used as an office, yard and maintenance facility for the small general engineering contractor. The purpose of this report is threefold: First,the proposed facility has been evaluated for the proper operation of the septic system to be installed. Secondly, the project has been assessed for current nitrate impact to the environment originating from surrounding land use operations and from potential future impact. And thirdly,this report specifies a septic system which has been designed to mitigate environmental impact based on contemporary scientific studies in conjunction with the on-site soil characteristics and depth to groundwater. II. SOIL SUITABILITY STUDY FINDINGS A. SUBJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION The land for the facility and surrounding land use was previously in agricultural production many years ago. This is evidenced by the United States Department of Agriculture(USDA) Soil Maps for San Joaquin County. The current surrounding land use is composed of commercial operations, mainly trucking facilities to the south,west and north. Directly to the north is the Highway 120 Bypass. To the east is agricultural production and residential development on City of Manteca water and sewer. The property is in the 100 year flood plain, per Map No. 060299- 9570. Applications on file with the Environmental Health Department reveal there have been no permits that have been issued for repairs/additions to existing systems in the one-half mile study area. There are two reasons for this: First there is very low density residential and commercial operations within the study area,thus a statistically lower likelihood of failures. Secondly,the indigenous soil is a silty sand/sandy silt soil structure which is conducive for excellent effluent management. LL 1 Na(ky Mfg Research