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LOGE 1516: Stonum Vineyards NLS Addendum Page 4 August 11, 2015 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 (used for the tasting room and winery workers), 5 gallons is typical for a bar customer, and 9 gallons is typical for a restaurant customer(used for the wine club events with kitchen) (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. In addition to the winery uses, an occupied two (2) bedroom residence exists on the Site. Though not planned, a potential second dwelling unit of two (2) bedrooms could legally be built on the property in the future. Considering the maximum potential build out of residential units, we estimate a maximum use of 120 gallons per day per bedroom. A typical residential concentration of 45 mg/L of nitrate as N is selected (Crites and Tchobanoglous, 1998). No contribution from the vineyard irrigation or any 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. The maximum average daily flow for the Site was estimated to be 525.4 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 46.9 mg/L-N at 525.4 gallons per day. Please see the following tables that present the information.