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1 Soil Suitability/ Nitrate Loading Study Addendum Letter Lange Twins Winery �: Acampo, California Irerracon May 21, 2019 N Terracon Project No. NA197005 The maximum daily flow for the existing facility during peak hours is 2,402 gpd. The special events may add an additional 4,000 gallons of effluent to the system per event day for a max daily flow total of 6,402 gpd. The addition of the proposed development and special events appears to be within the existing and proposed tank holding capacity of 12,700 gpd. There were no concerns reported in connection with the existing septic system. Nitrate as N levels for the existing facility were based on long term average daily flow rates for each system. The average daily flow for the existing facility, plus the proposed development and special events during peak hours was calculated to be approximately 1,568 gpd. Nitrate levels for the existing facility is anticipated between 9.0 mg/L-N during peak hours or up to 10.2 mg/L-N when a special event occurs. The proposed development is anticipated to add 1.9 mg/L N which increases nitrate as N levels to 12.1 mg/L-N slightly above the MCL of 10 mg/L-N. In general, the parcel appears suitable for the development of the future tasting stand alone restroom building and future administration building. Terracon recommends the septic system construction should follow the San Joaquin County OWTS where applicable. Limitations Our study takes into account the subject property only with the sewage load applied over the property site area. The study does not take into account surrounding properties and/or lands. The method utilized for the nitrate loading analysis is based on a simple mass balance formula, discussed in a published article by Hantzsche and Finnemore (1992), which provides a convenient and simplified method to estimate long-term groundwater nitrate impacts on an area- wide basis. A more detailed analysis was not requested nor intended. Our professional services were performed, our findings obtained, and our conclusions proposed in accordance with generally accepted engineering principles and practices. This warranty is in lieu of all other warranties either expressed or implied. Test findings and statements of professional opinion do not constitute a guarantee or warranty, expressed or implied. Responsive■ Resourceful ■ Reliable 8