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Soil Suitability/ Nitrate Loading Study Addendum Letter Irerracon Nostra Vita Winery Lodi, California May 20, 2019 revised June 10, 2019 Terracon Project No. NA197023 from the domestic supply well. The max daily wastewater flow for the existing wine tasting building is 650 gallons of effluent per day. On special event days, the max flow is anticipated to add up to 2,400 gallons of effluent per day for a total of 3,050 gallons for the existing building. The proposed 4,000 SF wine production building will add 391 gallons per day of effluent to the overall facility wastewater flow for a max daily flow total of 3,441 gallons per day. The existing septic system currently has a tank holding capacity of 1,600 gallons. The proposed development will add an additional 2,500 gallon septic tank for a tank holding capacity of 4,100 gallons. Although no concerns were reported for the existing septic system, the client should be aware wastewater flows may exceed the existing tank holding capacity when a special event occurs. Nitrate levels for the existing facility plus special events (5.4 mg/L-N) is below the MCL of 10 mg/L- N. The proposed 4,000 SF wine production building (2.6 mg/L) will increase nitrate as N levels to 8.0 mg/L-N also below the MCL. Based on the result of the nitrate loading balance, the proposed 4,000 SF wine production building is not anticipated to increase nitrates above the MCL. 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