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17 January 2020 AdvancedGeo Project No. 19-4964 Anfmployee-Owned Company Page 11 of 14 `ryf ETo between 2014 and 2018. The estimated deep percolation (R) is 3.64 inches (Appendix E). 9.3. CURRENT ON-SITE SOURCES OF NITRATE Septic systems, rainfall and agriculture (property to the west) are sources of nitrates (fertilizers) present on or around the property. The current site usage includes a 1,678-square foot house with two bedrooms. Residential use includes showering/bathing, clothes washing, cooking, and hand washing. The reasonable or maximum usage of wastewater for the two-bedroom house is 140 gpd per bedroom for a total of 280 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 280 gpd. • Home use concentration 45 mg/1-N (EHD standard). • The flow concentration of 12,600 mg/1-N gallon. 9.4. FUTURE ON-SITE SOURCES OF NITRATE The future site usage includes the addition of a residence 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 modular home is 140 gpd per bedroom for a total of 420 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 420 gpd. • Home use concentration 45 mg/1-N (EHD standard). • The flow concentration of 18,900 mg/1-N gallon.