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In May 2019, Live Oak collected rainwater during two storm events in Lodi; the samples were analyzed for nitrate by FGL Environmental of Stockton. Each sample was collected in a clean, dry, stainless steel bowl, then decanted into a plastic container and placed on ice for transport. Nitrate was detected in the May 17 sample at a concentration of 0.4 mg/L-N and in the May 19 sample at a concentration of 0.2 mg/L-N. Live Oak then averaged the concentrations of the two samples, for a value of 0.3 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 been selected for use in the nitrate loading calculation. Quantity and Quality of Domestic Wastewater Employee and customer numbers were provided by Parree Enterprises on the San Joaquin County Use Permit Application. According to the information provided, the facility will be open daily year-round, and three shifts are anticipated. The estimated employees and customers per shift are as follows: • First shift, 8 am — 5 pm: 35 employees, 800 customers; • Second shift, 5 pm — 12 am: 25 employees, 400 customers; • Third shift, 12 am — 8 am: 5 employees, 50 customers. By totaling the customers and employees throughout the day, we arrive at totals of 65 employees and 1,250 customers per day. 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 1947 Page 11