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will work seven days per week. Approximately one to two customers/visitors per day are <br /> anticipated, according to Mr. Alexander (personal communication, March 25, 2019). <br /> The estimated, sewage flow rates for various uses are available from a number of <br /> references. The uses presented below were guided by the San Joaquin County On-Site <br /> Wastewater Treatment Systems Standards (2017), Crites and Tchobanoglous (1998), <br /> and US EPA (1980). Crites and Tchobanoglous indicate that 13 gallons per day for <br /> each employee is typical for an office or industrial worker, and 5 gal/user is typical for a <br /> public lavatory; these rates were used for the employees and customers of the facility. <br /> The estimated flow values discussed here should not be used for the design and sizing <br /> of the septic system. The design and sizing of the septic system should utilize the San <br /> Joaquin County Environmental Health Department On-Site Wastewater Treatment <br /> Systems Standards which incorporate peak and surge flow factors. The estimates used <br /> in the On-Site Wastewater Treatment Systems Standards may be greater than those <br /> discussed here. <br /> Discharge of process water is not considered for the nitrate loading calculation. <br /> According to Mr. Alexander, the California Regional Water Quality Control Board is <br /> providing regulatory oversight for process water discharges into the on-site ponds. <br /> The nitrate as nitrogen (N) concentration of the employee and customer use is <br /> estimated to be 85 mg/L (US EPA, 1980). <br /> The maximum average daily flow for the Site was estimated to be 256.1 gallons per day <br /> (gpd). Please see the following table: <br /> Table 3. Average Daily Flow Calculation <br /> Use Units Rate Subtotal Reduction* Average Daily <br /> Flow <br /> Employees 7 13 gal/employee 91 gpd 5/7 65.0 gpda�t' <br /> (office) 7 <br /> Employees <br /> (warehouse/processing, 12 13 gal/employee 156 gpd 5/7, 9/12 83.6 gpdt7S <br /> 9 mos.) <br /> Employees 30 13 gal/employee 390 gpd 3/12 97.5 gpd 05 P4.5, <br /> (processing, 3 mos.) <br /> Customers/visitors 2 5 gal/customer 10 g d N/A 10 gpd <br /> Total h�0C— YAK's 256.1 gpd <br /> *Reduction factors convert calculated flow into average daily floW-overa year: 5/7 converts for days.Qf operation per <br /> week,3/12 and 9/12 correct for months per year. <br /> LOGE 1912 Page 12 <br />