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Quality of Rainwater Hantzsche and Finnemore listed 1 mg/L-N as the nitrate concentration of rainwater for their original calculation; in the past, Live Oak has also utilized this value for the nitrate loading calculation. In May 2019, Live Oak collected rainwater during two storm events in Lodi; in March and May 2020, Live Oak collected two additional samples at the same location. Each sample was collected in a clean, dry, stainless steel bowl, then decanted into a plastic container and placed on ice for transport. The samples were analyzed for nitrate by FGL Environmental of Stockton. Nitrate was detected in the May 17, 2019 sample at a concentration of 0.4 mg/L-N, in the May 19, 2019 sample at a concentration of 0.2 mg/L-N, in the March 16, 2020 sample at a concentration of 0.2 mg/L, and in the May 18, 2020 sample at a concentration of 0.4 mg/L. Live Oak then averaged the concentrations of the four samples, for a value of 0.30 mg/L-N to represent the nitrate concentration of rain. Because the San Joaquin County Environmental Health Department has requested that local and recent data be utilized wherever possible, the concentration of the Lodi rainwater has been selected for use in the nitrate loading calculation. Quantity and Quality of Domestic Wastewater Mr. Black indicated that the Glassfab Tempering facility will be open Monday through Friday, 10 hours per day. During this time, 30 employees and 1 to 2 customers/visitors will be present. Employees will work 8-hour shifts (correspondence, December 30, 2020). 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). Crites and Tchobanoglous indicate that 13 gallons per day for each employee is typical for an office or industrial worker, and 5 gallons per day per user is typical for a public lavatory; these rates were used for the facility's employees and customers. 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. LOGE 20-60 Page 12