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f I. INTRODUCTION. This report issues our findings of the Nitrate Loading and Soil Suitability.Studies regarding a new decentralized wastewater management system (septic) system for the existing.Sutter Home Winery Facility, dba Trinchero Family Estates. Domestic Wastewater Disposal Design and Operational Parameters are also presented in this Report. -These studies are 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. Eric Jenssen is the engineer for Sutter Home Winery and has provided the preliminary information to complete these studies. The site plans and associated civil engineering information were produced by the engineering firm of Advanced Design Group, Inc..ofModesto, California. Within the text of this Report, Bolded Section(§) numbers-are referenced at the beginning of an applicable Paragraph or Paragraphs, Appendix-or Table of Contents 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. Commercial winery.wastewater.from the Sutter Home facility is managed under permit from the Central Valley Regional Water Quality Control Board. The Winery property where the new domestic wastewater disposal system i.s'to be installed is referenced on the Title Page, and illustrated on the District Viewer Map and Assessor's Parcel Map found in Appendix A. Domestic wastewater originating from the on-site restrooms with toilets, sinks, urinals and two rarely used showers, is currently managed by a mound system near the north-center of the subject property. In May of this year, Chesney Consulting conducted a study.bf this mound system to primarily determine its current status and estimate rernain ng'lifespan. It was subsequently determined that the domestic wastewater management system should be_updated to handle higher flow volumes since the Winery is currently under expansion, which will lead to an increase in the number of employees. Installation of the new disposal area will be near the east end of the 70-acre Parcel, close to Jacob Brack Road. The new disposal area location has been dictated by underlying water table elevations. Under the existing mound system,the water table is two-to-three feet below grade. Backhoe test pits conducted for this investigation found the water-table to be approximately nine feet below grade under the proposed disposal area. Therefore, the new filter bed ieachfield can be k j installed nearly at-grade which will maintain the required five-foot separation distance between the E soil-effluent interface and the,highest anticipated.depth to the water table. The purpose of these Studies was to collect the following information as summarized below and fulfill EHD requirements of specifying domestic wastewater management:operational parameters for-the new on-site decentralized wastewater system: • Analysis of the capacity of the indigenous soils to accept the anticipated domestic wastewater.flows, assess the characteristics of the soil for.mifigation of nitrate impact, and 'formulate operational parameters and design specifications to achieve_ proper wastewater management from the proposed chambered`filter bed disposal area. - I Chesney Consulting