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I. INTRODUCTION This report issues my findings regarding the Soil Suitability/Nitrate Loading Studies and onsite wastewater treatment system (OWTS) operational parameters for a proposed third Accessory Unit Dwelling (ADU) on property owned by Mr. & Mrs. Hernandez. 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. The City of Tracy, nor the City of Mountain House sewer system does not serve this property. It is unknown as to whether the City of Mountain House will annex land east of Mountain House Parkway and thus potentially provide services to this area. All residential properties within this locale must operate on an onsite wastewater treatment system and domestic water supplied by an onsite well. Currently, the subject property contains a two bedroom single family residence (SFR), and a three bedroom mobile home. It is proposed to install a three bedroom manufactured (modular) home at the south end of the property. The existing onsite domestic well, located adjacent to Von Sosten Road will serve all three structures. The total Parcel area is 2.35 acres. The purpose of these Studies was to collect the following information to fulfill the requirements of the EHD regarding the proposal to install a third unit dwelling on the subject property. 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 analyzed in the proposed primary disposal area for the third unit dwelling to accept 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. This was accomplished by the referenced testing, physical/chemical analyses and operational parameters incorporated into the design of the wastewater 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 in Appendix F, there is ample area on the west side of the property for the required 100% replacement areas for the two existing structures and the proposed third structure. Ultimately, it may be that effluent from the SFR structure may have to be pumped to this location upon OWTS failure. Chesney Consulting