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20 July 2021 AdvancedGeo Project No. 21-6486 An Employee-Owned Company Page 12 of 15 ^^ � 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 an approximately 3,600-square foot residence with five (5) bedrooms and an approximately 1,800-square foot residence with three (3) bedrooms. Residential use includes showering/bathing, clothes washing, cooking, and hand washing. The reasonable or maximum usage of wastewater for the two residences is 100 gpd for the first bedroom and 50 gpd for each additional bedroom for a combined total of 500 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 500 gpd. • Home use concentration 45 mg/I-N (EHD standard). • The flow concentration of 22,500 mg/1-N gallon. 9.4. FUTURE ON-SITE SOURCES OF NITRATE The future site usage includes the addition of a modular home with three bedrooms for residential use. Residential use includes showering/bathing, clothes washing, cooking, and hand washing. The reasonable or maximum usage of wastewater for the three- bedroom home 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 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/I-N gallon.