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I. INTRODUCTION Soil Suitability/Nitrate Loading Studies (SSNL) and onsite wastewater treatment system ;OWTS) design parameters were completed for The Wine Group (TWG) winery facility in September 2021. The Wine Group is in the process of constructing a winery Distillation Area Facility, which will have a Control Room containing a Restroom with one toilet and one sink. The San Joaquin County Environmental Health Department (EHD) has specified the requirement of an Addendum to the original Studies addressing this new Restroom. This Addendum examined the underlying soil structure and characteristics to determine the suitability of managing the anticipated domestic wastewater flows from the proposed Restroom. Mr. Ralph Medema, PE is Senior Project Engineer for TWG winery. He has provided the preliminary information to complete these Studies. Drawings of the proposed Control Room and the design details of the effluent disposal system to serve the Restroom are included in this Addendum. Within the text of this Report, Bolded Section (§) numbers are indicated 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, but may not necessarily be referenced. NLS§ 2.3, SSS§ 3.1. The subject property is located on the south side of State Route 120, east of Murphy Road, and approximately six miles east of the town of Manteca. There are no municipal water, sewer or stormwater management services that serve this area. Consequently, the winery has its own existing OWTS system, domestic wells, and on-site stormwater management system. The winery's domestic water supply operates under a Small Public Water System and is therefore monitored by EHD. It will be decades, if ever, before municipal water and wastewater management services become available to this locale. The winery process wastewater is currently land -surface applied in the surrounding agricultural production land owned by TWQ but this will change when the wastewater treatment facility becomes operational. Discharge of the treated wastewater is currently managed by the engineering firm of Kennedy/Jenks under Waste Discharge Requirements (WDRs), as promulgated by the Central Valley Regional Water Quality Control Board. SSS§ 1.1, 1.2. The Control Room is located on APN 245-060-42, consisting of 145.91 Acres. This Parcel creates the specific winery area for use in the nitrate loading calculations, since all domestic wastewater sources originate on this Parcel. Wastewater from the sources on this Parcel is currently transferred to a single disposal location, as engineered for the original SSNL. However, the Control Room OWTS will be self-supporting because the distance is too great and the effluent volume too small to economically pump the effluent to this primary disposal location. Page -1- Chesney Consulting