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NITRATE LOADING CALCULATION INCLUDING POTENTIAL SPECIAL EVENTS Quantity and Quality of Domestic Wastewater 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 Disposal Standards (2003), Crites and Tchobanoglous (1998), and EPA (1980). The references indicate that 13 gallons for each employee is typical for an office worker, and 5 gallons is typical for a bar customer; these rates were used for the winery facility (Crites and Tchobanoglous, 1998). 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 On-Site Wastewater Disposal Standards which incorporate peak and surge flow factors. The estimates used in the On-Site Wastewater Disposal Standards may be greater than those discussed here. According to the Site Approval Application, the proposed small winery will be open four days a week with both employees and customers present; the hours will be from 12:00 until 6:00 p.m. Two employees will operate the winery. Up to 10 customers are anticipated per day that the winery is open. Although no special events are planned for the winery at this time, Mr. Gash indicated that in the future he may wish to host events. He stated that a maximum of four to five special events could be held per year; attendance at each event could include up to 20 people. The nitrate as nitrogen (N) concentration of these uses is estimated to be 85- mg/L (Crites and Tchobanoglous, 1998). In addition to the winery uses, the existing four-bedroom residence is considered for the nitrate loading. We estimate a maximum use of 120 gallons per day per bedroom for the residence. A typical residential concentration of 45 mg/L of nitrate as N is selected (Crites and Tchobanoglous, 1998). It is possible a second dwelling unit could be constructed on the Site in the future. The second dwelling unit can be up to two bedrooms. This potential future use is considered. No contributions from the future vineyard irrigation or soil amendments are considered for the Hantzsche/Finnemore method. It is reasonably assumed that the irrigation and soil amendments would be applied at close to agronomic rates for a net balance of plant irrigation and nutrients.