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Addendum-Soil Suitability&Nitrate Loading Study Page 2 Proposed Stama Winery, 17521 Davis Rd,Lodi CA Project No. 670.1B November 6,2013 Personnel No.Persons Flow Rate Schedule Annual Output Caretaker Residence 5 60 GPD per Person 355 DaysfYr 106,500 gals Full Time Employees 4 15 GPD per Person 260 Days/Yr 15,600 gals Part Time Em to es• 5 8 GPD per Person 260 Days/Yr 10,400 gals Tasting Room Visitors** 71 71 X 4 GPD 355 DaysfYr 100,820 gals Marketing Meetings*** 150 8 GPD per Person 30 DaysfYr 36,000 gals Comms Kitchen 150 3 GPD per Person 8 DaysfYr 3.600 gaJs Total Annual Effluent, 272,920 gab • Assumes part timers work approx.half time. •• Assumes 500 visitors per 7-day week. Assumes 4 restroom visits each day per person at 2 gals.per use. 7.2 Nitrate Loading Calculation An estimate is made of total nitrate load as calculated from a simple mass-balance approach. The Hantzsche and Finnemore model is then used to estimate the nitrate concentration in groundwater. The calculation worksheet(s) are attached. The following table summarizes the revised flow-rate calculation with nitrate effluent loads for the anticipated septic system. Use Annual Ave. Effluent Vol.Weighted Effluent Daily Flow Cone. N„ Ave. Caretaker Residence 106.500 gals 292 GPD 44 m 17.2 mgfL Full Time Employees 15,600 gals 43 GPD 80 mgfL 4.6 m Part Time Employees 10,400 gals 28 GPD 80 m 3.0 m Tasting Room 100,820 gals 276 GPD 80 m 29.5 m Marketing Meetings 36,000 gals 99 GPD 80 m 10.6 mgfL Comm?Kitchen 3,600 10 60 m L 0.8 m TOTALS 272,920 gals 748 GPD 65.7 m The total load will be 748 GPD at 65.7 mg/L nitrate concentration. The Hantzsche and Finnemore model is then used to estimate the nitrate concentration in groundwater. The calculation worksheet(s)are attached. System Acres Daily Flow Effluent Denitrification Percolation N Loading Cone. . Factor d R Proposed 1 10 748 GPD 1 65.7 mgfL 25% 7.85 in. 112 IN The proposed septic system will produce a load of 112 pounds per year of nitrogen loading. This represents an average concentration at the groundwater surface 6.48 mg/L of nitrogen, or 65 percent of the established maximum contaminant limit of 10 mg/L. The future system is estimated to result in nitrate loading to groundwater that will not exceed the MCL limit. This calculation does not consider the dilution that occurs as newly introduced water mixes with the deeper groundwater. The calculated groundwater concentrations offers a "worst case" 2937 Venemen Ave.,#8240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto,CA 95356 Fax: (209)569-0295