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I. INTRODUCTION This report issues the investigative findings and operational parameters for the Onsite Wastewater Treatment System(OWTS)proposed to be installed for this project. The Studies were completed as a requirement of the San Joaquin County Environmental Health Department(EHD)to ensure that the wastewater treatment system for this project is adequately designed for its intended use and to assess, quantify and mitigate nitrate impact potential. Within the text of this Report, Bolded Section (§)numbers are referenced at the beginning of an applicable Paragraph(s), or Appendices that correspond with the EHD Requirements Checklist. Section Numbers referenced as SSS§, are sections applicable for the Soil Suitability Study Requirements Checklist. Section Numbers referenced as NLS§, are sections applicable for the Nitrate Loading Study Requirements Checklist. Other portions of text may also apply to other sections of the Checklists. SSS§ 1.1, 1.2. The registered owners of the 100.7 acre subject property are referenced on the Title Page. The property is an existing dairy facility, containing freestall barns, open corrals, a milk barn, manure separation and holding basins, a single family residential structure and cropland. A new freestall barn is in the construction process and will contain a robotic milking system. Surrounding land use is illustrated by the attached Google aerial photo and is predominately dairies, agricultural production land and sparse rural residential. NLS§2.3, SSS§3.1. As noted on the attached District Viewer map,the subject property is located northwest of the town of Escalon. The following summarizes the investigative parameters included to complete this report: • Soil chemical testing was conducted on three samples retrieved from a 23 ft exploratory boring, which included analyses for the constituents that influence nitrate loading. Physical testing of the soil samples included particle size(texture) analysis and the actual percolation testing to determine soil permeability. • The capacities of the on-site soils in the proposed effluent disposal location were analyzed for: 1.) The ability to accept future calculated wastewater effluent flows from the milk house, 2.) To quantify through calculations, the nitrate impact potential to the underlying groundwater from percolating effluent, 3.)To assess the characteristics of the on-site soils to mitigate nitrate impact, and 4.)Describe operational processes to further mitigate nitrate loading. • The new wastewater management(septic) system for the proposed facility, including the primary and 100%replacement effluent disposal areas are included on the attached Site Plan. The soil permeability testing has found the indigenous surface soils to contain a tight sandy loam soil with relatively high clay content and slow permeability, down to a depth of approximately six ft. Soil transitions L sandy loam to a loamy sand from six to 10 ft,then back to a sandy loam at the ten-ft depth,where ional permeability exists. At 23 ft,the soil has a high percentage of tight, compact silt. 1 Chesney Consulting