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Soil Suitability/ Nitrate Loading Study Addendum Letter 1rerracon <br /> Nostra Vita Winery Lodi, California <br /> May 20, 2019 Terracon Project No. NA197023 <br /> day for a total of 3,050 gallons for the existing building. The proposed wine production building <br /> will add 45 gallons per day of effluent to the overall facility wastewater flow for a max daily flow <br /> total of 3,095 gallons per day. The existing septic system currently has a tank holding capacity of <br /> 1,600 gallons. The proposed development will add an additional 2,500 gallon septic tank for a <br /> tank holding capacity of 4,100 gallons. Although no concerns were reported for the existing septic <br /> system, the client should be aware wastewater flows may exceed the existing tank holding <br /> capacity during special events. <br /> Nitrate loading results were based on average daily flow rates. Nitrate levels for the existing <br /> facility plus special events is 4.3 mg/L-N. The proposed development is anticipated to add 1.2 <br /> mg/L N which increases nitrate as N levels to 5.5 mg/L-N below the MCL of 10 mg/L-N. <br /> Based on a review of the utility plan, the proposed leach field will be located within 150 feet of the <br /> public supply well. Terracon recommends the septic system construction should follow the San <br /> Joaquin County OWTS where applicable including setback requirements for public water wells of <br /> 150 feet. <br /> Limitations <br /> Our study takes into account the subject property only with the sewage load applied over the <br /> property site area. The study does not take into account surrounding properties and/or lands. <br /> The method utilized for the nitrate loading analysis is based on a simple mass balance formula, <br /> discussed in a published article by Hantzsche and Finnemore (1992), which provides a <br /> convenient and simplified method to estimate long-term groundwater nitrate impacts on an area- <br /> wide basis. A more detailed analysis was not requested nor intended. <br /> Our professional services were performed, our findings obtained, and our conclusions proposed <br /> in accordance with generally accepted engineering principles and practices. This warranty is in <br /> lieu of all other warranties either expressed or implied. Test findings and statements of <br /> professional opinion do not constitute a guarantee or warranty, expressed or implied. <br /> Responsive ■ Resourceful r Reliable 8 <br />