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r , Soil Suitability/ Nitrate Loading Study Addendum Letter Irerracon Nostra Vita Winery Lodi, California May 20, 2019 revised June 10, 2019 Terracon Project No. NA197023 We understand the SSNLS addendum letter has been requested to update the prior SSNLS report as required by the San Joaquin County Environmental Health Department (EHD). We further understand the site is proposed to be developed in three phases and this update letter considers the Phase I development which includes an approximately 4,000 square foot (SF) building and additional septic system. Terracon was provided with a copy of the following documents. Soil Suitability / Nitrate Loading Study, Mencarini Property, 1150 W. Turner Road, Lodi, CA dated August 6, 2008 and prepared by Neil O. Anderson & Associates, Inc. (NOA), Project No. LGS080538 Based on a review of the prior NOA report, the site consisted of a 45.91 acre tract of agricultural land improved with a vineyard, a shed, domestic well, and agricultural well. A former residence had been removed.At the time of the report,the site was proposed to be developed with a new wine tasting facility which would be open six days per week 9 hours per day with up to 4 employees, 10 customers, and 4 marketing events per year. The site elevation was reported between 30 and 35 feet mean sea level with a topographic gradient to the west. Depth to groundwater was reported at 10 feet below grade surface (bgs) and groundwater was not encountered in the borings advanced to 8.5 feet bgs. A groundwater sample collected from the domestic well was analyzed for Nitrate and dibromochloropropane (DBCP). Nitrate was reported at 31.6 milligrams per liter (mg/L) below the United State Environmental Protection Agency (EPA) maximum contaminant level (MCL) of 45 mg/L. DBCP was identified in the groundwater sample at 0.17 micrograms per liter (ug/L) below the MCL of 0.2 ug/L. Surface soils consisted of Tokay fine sandy loam. Two soil borings were advanced to 3.5 feet bgs and 8.5 feet bgs. Soils consisted of medium brown sandy silt. A 4 hour shallow percolation test conducted in August 2008 resulted in a percolation rate of 4.9 minutes per inch. NOA calculated the average daily flow for the septic wastewater to be 266 gallons per day (gpd). The average total nitrogen concentration of wastewater was reported at 85 milligrams per liter nitrogen (mg/L-N). A 25% denitrification factor was selected due to the presence of fine-grained soils. Deep percolation of rainfall was estimated to be 5.76 inches per year. The nitrate mass balance was calculated to be 1.8 mg/L-N below the MCL of 10 mg/L-N. Site Plan dated February 22, 2019 prepared by NJ Associates Based on a review of the Site Plan the site is proposed to be developed in three Phases. The site is currently developed with a 4,000 SF 2 story tasting room, eating area, gravel paved drive areas, and vineyard. A 950 SF storage shed is proposed to be demolished. Phase I of the proposed site development will include a 4,000 SF single story building and additional paved parking and drive areas. Refer to the Site Plan for additional information regarding all three phases of development. Utility Plan dated May 10, 2019 prepared by MCR Engineering Based on a review of the Utility Plan, the existing septic tank is located north of the existing building and the leach field is located west of the existing building. An approximately —4,000 SF wine production building is proposed to be developed Responsive ■ Resourceful ■ Reliable 2