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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. The 2020 analytical reports are attached as Appendix 6. 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 Ms. Affonso indicated that the existing shop on the Site will be renovated to include a two-bedroom second unit dwelling. A three bedroom home is also located on the Site. Crites and Tchobanoglous (1998) list a typical flow rate of 50 to 70 gallons per person per day for an individual residence. In the past, San Joaquin County Environmental Health Department has requested that the flow rate be calculated as 140 gallons per bedroom per day to reflect maximum usage. On March 4, 2020, however, Michael Kith, Lead Registered Environmental Health Specialist at the San Joaquin County Environmental Health Department, stated that he has conferred with Norman Hantzsche (author of the 1992 paper discussed previously), and they have arrived at a new method to determine flow from residential sources. He indicated that wastewater flow from a single-family residence should be calculated as 100 gallons per day (gpd) for the first bedroom and 50 gpd for each additional bedroom, additional residences should be calculated in the same manner (personal communication, March 4, 2020). Using this method, the existing three-bedroom house would contribute 200 gpd, and the proposed two-bedroomhouse_would contribute 150 gpd, for a total wastewater flow rate of 350.9pd. �- -- .--.�- LOGE 20-22 Page 10