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The nitrate concentration of rainfall was estimated to be 1 mg/L-N (Hantzsche and Finnemore, 1992). 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 Sewage Standards which incorporate peak and surge flow factors. The estimates used in the Sewage Standards may be greater than those discussed here. According to the Site Approval Application, the proposed small winery will be open seven days a week from 10 to five with two owners present and up to two additional employees. The wine tasting room will also be open seven days a week; up to 20 customers are anticipated per day. No winery special events or marketing events are proposed. 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 three-bedroom residence and one-bedroom area in the winery building are considered for the nitrate loading calculation. We estimate a maximum use of 120 gallons per day per bedroom for the residences. A typical residential concentration of 45 mg/L of nitrate as N is selected (Crites and Tchobanoglous, 1998). The maximum average daily flow for the Site was estimated to be 625.5 gallons per day (gpd). Through the use of a weighted average, the average concentration of all the different effluent flows and concentrations was determined to be 54.3 mg/L-N at 625.5 gallons per day. Please see the following tables that present the information in a tabular form. LOGE1013 Page 10