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I. INTRODUCTION This report issues my findings regarding the Nitrate Loading Study, Soil Suitability Study and onsite wastewater treatment system (OWTS) operational and design parameters for a proposed three bedroom, two bath modular (manufactured) home on property owned by Mr. and Mrs. Erskine. 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). Within the text of this Report, Bolded Section (§) numbers are referenced at the beginning of an applicable Paragraph or Paragraphs, 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. NLS§ 2.3, SSS§ 1.2. Since this project is in the County of San Joaquin, there is no sewer system available, nor will there be for several decades, and probably never. All residential properties within this locale must operate on septic systems, also known as onsite wastewater treatment systems (OWTS), and domestic water supplied by onsite wells. Prior to improvements made to the property, aerial photos revealed a structure near the southwest corner (SWC). Mrs. Erskine's parents owned the subject property at this time and built this structure in the SWC. Presently, the subject property has a new domestic well, a pump house and outbuildings. The total Parcel area is 1.51 acres. The purpose of these Studies was to collect the following information to fulfill the requirements of the EHD. Wastewater system operational parameters are also presented within this report to facilitate the transfer of information to EHD: • The capacity of the indigenous soils was 1.) Analyzed in the proposed primary disposal area for the management of the anticipated wastewater flows, 2.) Assessment of the soil characteristics to mitigate nitrate impact, and 3.) Discussion of operational parameters to achieve the two goals of proper wastewater management and nitrate loading mitigation from the effluent disposal system. • Soil physical and chemical testing was conducted to determine the following: Physical testing included percolation testing and particle size analysis of the soils underlying the effluent disposal area. Chemical testing included analyses for the constituents that influence nitrate loading. • As illustrated on the Aerial photo, both the primary and 100% replacement area for the proposed modular home can be installed on the east side of the property, adjacent to Koster Road. In summary, the soils testing and investigation has found the indigenous soils under the proposed domestic wastewater disposal area contain a predominately fine-grained silty, clayey material that possesses an acceptable percolation rate that is faster than what would be expected given the soil type. Clay soils in the Tracy area have exceptional permeability. The nitrate loading criteria were calculated to be acceptable. Chesney Consulting