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• month; no other special events are planned. Ms. Peterson indicated that the main house on the Site has four bedrooms, while the caretaker's house has three bedrooms. 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 5 gallons per visitor is typical for guests at a visitor center; these rates were used for the stable's employees and customers (Crites and Tchobanoglous, 1998). Crites and Tchobanoglous (1998) list a typical flow rate of 50 to 70 gallons per person per day for an individual residence. The San Joaquin County Enviromental Health Department has indicated that maximum flow and double occupancy within each bedroom should be considered for the nitrate loading assessment; as a result, a value of 140 gallons per bedroom per day has been selected (personal communication, January 6, 2017). 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. The nitrate as nitrogen (N) concentration of the customer and employee use is estimated to be 85 mg/L (US EPA, 1980). A typical residential concentration of 35 mg/L of nitrate as N is selected for the existing residences (Crites and Tchobanoglous, 1998). No contributions from crop 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. The maximum average daily flow for the Site was estimated to be 1,085 gallons per day (gpd). Through the use of a weighted average, the average concentration of the different effluent flows and concentrations was determined to be 39.8 mg/L-N at 1,085 gallons per day. Please see the following tables: • LOGE 1820 Page 10