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I. INTRODUCTION This report issues my findings regarding the Nitrate Loading Study and Soil Suitability Study for the proposed West Lathrop Business Park. These studies were required by the San Joaquin County Environmental Health Department (EHD) and comply with the San Joaquin County Development Title, specifically Section 9-1105.2(d). Mr. Mike Preston, owner of MDP Valley Properties, LLC, and President of Preston Pipelines, Inc. is the owner/developer of the project and has provided the preliminary information to complete these studies. The Site Plan and associated civil engineering information were produced by the engineering firm of Siegfried Engineering of Stockton, California. Since the City of Lathrop sewer and water has not expanded to the subject property, the new site improvements will have to be on domestic well water and a decentralized wastewater management system. A new domestic well is proposed to be drilled near the south-center of the property. City of Lathrop utilities are expected to serve the property in five to ten years. SSS§ 1.2 The project site is near the north end of the City limits of Lathrop, on the west side of Interstate 5 and the frontage road,Manthey Road. Currently,the subject property is used by the Preston Pipelines Lathrop Facility for the parking and storage of trucks and equipment, and four office trailer buildings-two of which are being used. The balance of the property consists of open land. The total Parcel area is 34.7 acres. It is proposed to improve the property in two phases by first slightly re-orientating the existing office trailer buildings and connecting them to the new proposed septic system. The effluent disposal area to serve these trailers is referenced in this report as WLF for West Leach Field. The second phase to run almost concurrently is to construct a new office building adjacent to Manthey Road. The new Office Building will be the main offices for the Preston Pipelines Company Lathrop Office, and will also be offices for additional tenants that may or may not be related to the operations of the Preston Pipeline Company. The effluent disposal area to serve the new Office Building is referenced in this report as ELF for East Leach Field. These proposed improvements are illustrated on the attached Site Plan. The purpose of these Studies was to collect the following information to fulfill EHD requirements and specify septic system operational parameters for the new on-site decentralized wastewater system: • To analyze the capacity of the indigenous soils to accept the anticipated wastewater flows, assess the characteristics of the soil to mitigate nitrate impact, and formulate operational parameters and design specifications to achieve the two goals of proper wastewater management and nitrate mitigation from the proposed filter bed disposal fields. This was accomplished by the referenced testing,physical/chemical analyses and operational parameters incorporated into the design of the wastewater disposal system. • Conduct soil physical and chemical testing for determination of the following: Physical testing included percolation testing, standard penetration testing, and particle size analysis of the soil characteristics underlying the two proposed effluent disposal areas. Chemical testing included analyses for constituents that influence nitrate loading. • Chemical and Mounding Analyses of the water table underlying the two proposed filter bed locations was conducted. Chemical analysis established a baseline concentration of the tested constituents, and the capacity for nitrate loading. 1 Chesney Consulting