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Quantity and Quality of Domestic Wastewater According to the San Joaquin County Site Approval application, two employees and approximately 10 customers are anticipated at the winery Thursday through Sunday. The estimated sewage flow rates for various uses are available from a number of references. The uses presented below were guided by the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017), Crites and Tchobanoglous (1998), and US EPA (1980). The references indicate that 13 gallons for each employee is typical for an office or industrial worker and 3 gallons is typical for a bar customer; these rates were used for the winery employees and customers The estimated flow values discussed here should not be used for the design and sizing of the septic system. The design and sizing of the septic system should utilize the San Joaquin County Environmental Health Department On-Site Wastewater Treatment Systems Standards which incorporate peak and surge flow factors. The estimates used in the On-Site Wastewater Treatment Systems Standards may be greater than those discussed here. Discharge of process water is not considered for the nitrate loading calculation. According to Mr. Busalacchi, winery process water will be stored on-site and periodically trucked off for appropriate disposal. The nitrate as nitrogen (N) concentration of the employee and customer use is estimated to be 85 mg/L (US EPA, 1980). The maximum average daily flow for the Site was estimated to be 31.9 gallons per day (gpd). Please see the following table: Table 3. Average Daily Flow Calculation Use Units Rate Subtotal Reduction* Average Daily Flow Employees 2 13 gal/employee 26 gpd 4/7 14.8 gpd (Thurs.-Sun.) Customers 10 3 gal/customer 30 gpd 4/7 17.1 gpd (Thurs.-Sun.) _- Total 31.9 gpd *Reduction factors convert calculated flow into average daily flow:4/7 converts for days of operation per week. 00 rso IL LOGE 1913 ,��,�' �� V" Page 11