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I. INTRODUCTION This report issues our findings regarding the Nitrate Loading Study and Soil Suitability Study for the proposed Warehouse Expansion at the R.B. Construction, Inc. 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. Mike Kniss is the Sales and Operations Manager for the Company and is coordinating this project. He has provided the preliminary information to complete these studies. The Site Plan was provided by Mr. Randy Reeves of Diede Construction, Inc., of Lodi, CA. The site is located on the East Frontage Road of Highway 99, one-quarter mile north of the Arch Road interchange. The project is composed of 4.5 acres with no proposed zoning changes and is currently used as a rental equipment, storage and trucking facility. There are currently six buildings, with the primary buildings a 130 sq ft office and a 3,000 sq ft shop, with a rest room. Future buildings are the aforementioned warehouse and another potential building. The purpose of this report is threefold: First,the subsurface soil was evaluated to determine if the proposed septic system to be installed will function as intended. Secondly, the project was assessed for current nitrate impact originating from on-site and surrounding land use, with potential future impact quantified. And thirdly, this report describes a septic system which will comply with San Joaquin County Environmental Health Department requirements and may mitigate nitrate-nitrogen environmental impact. II. SOIL SUITABILITY STUDY FINDINGS A. SUBJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION The land for the facility and surrounding land use is, and has been, industrial, commercial and agricultural production for many years. It is currently unsewered. Land use is evidenced by the United States Geological Survey (USGS) Map and United States Department of Agriculture (USDA) Soil Maps for San Joaquin County. There is no single family housing on individual lots. Adjacent to the north of the project is the Little John Creek, a trucking yard for trailer storage and a Residential Trailer Park. To the northwest is the City of Stockton, and to the southwest is the Stockton Airport. Flood plain determination is to be made by the Consultant to Diede Construction, San Joaquin Design Group of Stockton, CA. According to Applications on file with the County Environmental Health Department, there have been eight permits issued for repairs/additions to existing systems in the one-half mile study area. Five of these permits were for the Trailer Park, north of the subject property. However, due to the fact that the site address is unusual, it is our opinion that many of the permits have been filed under different addresses. Although eight permits can be considered a comparatively high number of repairs/additions, there are probably many more. The requirement for additional drainage can be attributed to the heavy clay stratum which exists at the typical leachline depth, along with a subsurface hardpan layer. I Na!!ey Ag Research