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07 Septmber 2021 <br />Project No. 21-6531 <br />Page 11 of 14 <br />The current site usage includes a 2,579-square foot house with three bedrooms. <br />Residential use includes showering/bathing, clothes washing, cooking, and hand <br />washing. The reasonable or maximum usage of wastewater for the three-bedroom house <br />is 100 gpd for the first bedroom and 50 gpd for each additional bedroom for a total of <br />200 gpd. <br /> <br />The total nitrate-nitrogen (NO3_N) average concentrations in domestic waste ranges <br />between 20 to 85 milligram total nitrogen liter (mg/l-N) with an average of 45 mg/l-N when <br />washing and sanitation is considered. <br /> <br />The weighted average calculation for total nitrogen concentrations for onsite residential <br />flow is proposed as the following: <br /> <br /> Residential volume 200 gpd. <br /> Home use concentration 45 mg/l-N (EHD standard). <br /> The flow concentration of 9,000 mg/l-N gallon. <br /> <br /> <br />9.4. FUTURE ON-SITE SOURCES OF NITRATE <br /> <br />The future site usage includes the addition of a modular home with three bedrooms for <br />residential use. Residential use includes showering/bathing, clothes washing, cooking, <br />and hand washing. The reasonable or maximum usage of wastewater for the three- <br />bedroom home is 100 gpd for the first bedroom and 50 gpd for each additional bedroom <br />for a total of 200 gpd. <br /> <br />The total nitrate-nitrogen (NO3_N) average concentrations in domestic waste ranges <br />between 20 to 85 mg/l-N with an average of 45 mg/l-N when washing and sanitation is <br />considered. <br /> <br />The weighted average calculation for total nitrogen concentrations for onsite residential <br />flow is proposed as the following: <br /> <br /> Residential volume 200 gpd. <br /> Home use concentration 45 mg/l-N (EHD standard). <br /> The flow concentration of 9,000 mg/l-N gallon. <br /> <br /> <br />9.5. DENITRIFICATIONS CAUSED BY SOILS <br /> <br />The process of denitrification is important when utilizing subsurface septic lines and <br />regularly occurs in the soil within the leach fields where bacteria utilize oxygen in the <br />nitrate to release nitrogen gas out to the atmosphere. The denitrification process is