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April 17, 2019 BGG Job No. G001.05 The proposed improvement area currently contains asphalt concrete pavement for vehicle and truck traffic and is flanked by vineyards to the north and south. The existing winery facility is located to the south of the proposed guard station area(Plate 2—Site Plan). The site is relatively level with elevations varying between approximately 32 to 35 feet above mean sea level (MSL),according to Google Earth mapping. According to the San Joaquin County Community Development Department, the subject property is zoned AG, general agriculture. EXISTING AND PROPOSED SEPTIC SYSTEM USAGE Existing Septic System No septic systems are currently present at the site. Proposed Septic System A new 1,500-gallon septic system is proposed to serve the new Guard Station facility (Plate 2). On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. No permits were identified. Existing Septic Tank Usage in the Vicinity To estimate the septic system usage in the area,we used professional judgement to identify potential septic systems that exist within approximately one square mile surrounding the project site. Google Earth imagery was utilized. Each building cluster on the photo was assumed to have one septic system. Using this method, it is estimated that approximately 30 to 40 septic systems per square mile are located in the immediate vicinity of the Site. The general site area primarily consists of the Delicato Family Vineyards winery facility and orchards,vineyards,and open agricultural land. Several residential ranchette properties are located in the site vicinity. Septic Permit History in the Vicinity A review of septic permits on file at the San Joaquin County Environmental Health Department for nearby properties indicated that most septic systems in the area utilize leach lines. Expected On-Site Maximum Septic Tank Usage Maximum expected usage for the proposed onsite septic system will be from the future employees at the Guard Station. Septic system design should be based on the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) or other engineering recommendations. GROUNDWATER INFORMATION Groundwater Depth and Gradient We reviewed ground water elevation information available from the California Department of Water Resources Water Data Library (CA WDL) and the San Joaquin County Flood Control and Water BAEZ GEOTECHNICAL GROUP Soil Suitability Study and Nitrate Loading Study-DFV Guard Station Page 2