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01 April 2021 <br /> Project No. 21-6365 <br /> Page 12 of 15 <br /> washing. The reasonable or maximum usage of wastewater for the two-bedroom house <br /> is 100 gpd for the first bedroom and 50 gpd for each additional bedroom for a total of <br /> 150 gpd. <br /> The total nitrate-nitrogen (NO3_N) average concentrations in domestic waste ranges <br /> between 20 to 85 milligram total nitrogen liter (mg/1-N)with an average of 45 mg/1-N when <br /> washing and sanitation is considered. <br /> The weighted average calculation for total nitrogen concentrations for onsite residential <br /> flow is proposed as the following: <br /> • Residential volume 150 gpd. <br /> • Home use concentration 45 mg/1-N (EHD standard). <br /> • The flow concentration of 6,750 mg/1-N gallon. <br /> 9.4. FUTURE ON-SITE SOURCES OF NITRATE <br /> The future site usage includes the addition of a modular home with two 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 two- <br /> bedroom home is 100 gpd for the first bedroom and 50 gpd for each additional bedroom <br /> for a total of 150 gpd. <br /> The total nitrate-nitrogen (NO3_N) average concentrations in domestic waste ranges <br /> between 20 to 85 mg/1-N with an average of 45 mg/1-N when washing and sanitation is <br /> considered. <br /> The weighted average calculation for total nitrogen concentrations for onsite residential <br /> flow is proposed as the following: <br /> • Residential volume 150 gpd. <br /> • Home use concentration 45 mg/1-N (EHD standard). <br /> • The flow concentration of 6,750 mg/1-N gallon. <br /> 9.5. DENITRIFICATIONS CAUSED BY SOILS <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 <br /> controlled by waste concentrations, soil type, annual rainfall, pH of the soils, total organic <br /> concentration of the soil (TOC) and exposure time to nitrogen. The soils with a high or <br /> moderate clay content, higher organic content, high pH, and adequate soil moisture <br />