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28 September 2022 AdvancedGeo Project No. 22-6994 An Employee -Owned Company . Page 12 of 15 n.M 9.3. CURRENT ON-SITE SOURCES OF NITRATE Septic systems, rainfall and agriculture are sources of nitrates (fertilizers) present on or around the property. The current site usage includes a 1,235 -square foot house with three bedrooms. Residential water use includes showering/bathing, clothes washing, cooking, and hand washing. The reasonable or maximum usage of wastewater for the three-bedroom house is 100 gpd for the first bedroom and 50 gpd for each additional bedroom for a total of 200 gpd. The total nitrate -nitrogen (NO3_N) average concentrations in domestic waste ranges between 20 to 85 milligram total nitrogen liter (mg/1-N) with an average of 45 mg/1-N when washing and sanitation is considered. The weighted average calculation for total nitrogen concentrations for onsite residential flow is proposed as the following: • Residential volume 200 gpd. • Home use concentration 45 mg/1-N (EHD standard). • The flow concentration of 9,000 mg/1-N gallon. 9.4. FUTURE ON-SITE SOURCES OF NITRATE The future site usage includes the addition of a modular home with two bedrooms for residential use. Residential water use will include showering/bathing, clothes washing, cooking, and hand washing. The reasonable or maximum usage of wastewater for the two-bedroom home is 100 gpd for the first bedroom and 50 gpd for each additional bedroom for a total of 150 gpd. The total nitrate -nitrogen (NO3_N) average concentrations in domestic waste ranges between 20 to 85 mg/1-N with an average of 45 mg/1-N when washing and sanitation is considered. The weighted average calculation for total nitrogen concentrations for onsite residential flow is proposed as the following: • Residential volume 150 gpd. • Home use concentration 45 mg/1-N (EHD standard). • The flow concentration of 6,750 mg/1-N gallon.