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23 October 2019 AdvantedGeo <br /> AGE Project No. 19-4881 E rn vi ro ri m e r t a I <br /> Page 12 of 15 <br /> washing. The reasonable or maximum usage of wastewater for the two-bedroom house <br /> is 140 gpd per bedroom for a total of 280 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 280 gpd. <br /> • Home use concentration 45 mg/1-N (EHD standard). <br /> • The flow concentration of 12,600 mg/1-N gallon. <br /> 9.4. FUTURE ON-SITE SOURCES OF NITRATE <br /> The future site usage includes the addition of a 1,620-square foot residence with two <br /> bedrooms for residential use. Residential use includes showering/bathing, clothes <br /> washing, cooking, and hand washing. The reasonable or maximum usage of wastewater <br /> for the two-bedroom mobile home is 140 gpd per bedroom for a total of 280 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 280 gpd. <br /> • Home use concentration 45 mg/1-N (EHD standard). <br /> • The flow concentration of 12,600 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 /> denitrify the concentrations by approximately 30 percent and less desirable soils with <br />