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01 October 2019 <br />AGE Project No. 19-4850 <br />Page 11 of 14 <br />twelve (12) full-time employees. The reasonable or maximum usage of wastewater for <br />the warehouse and office trailer is 20 gpd per person or 240 gpd (12 employees). <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 commercial <br />flow is proposed as the following: <br /> <br /> Commercial volume 240 gpd. <br /> Warehouse and office trailer use concentration 45 mg/l-N (EHD standard). <br /> The flow concentration of 10,800 mg/l-N gallon. <br /> <br /> <br />9.4. FUTURE ON-SITE SOURCES OF NITRATE <br /> <br />The future site usage includes similar usage as the existing site usage. However, its <br />reasonable to expect a 25% to 30% future increase in the number of employees at the <br />facility. Based on the operating schedule of the business (Monday through Friday from <br />8:00 AM to 5:00 PM; 260 days a year), the reasonable or maximum usage of wastewater <br />for the warehouse and office trailer for 4 additional employees (33% increase) is 20 gpd <br />per person or 80 gpd (4 employees). <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 commercial <br />flow is proposed as the following: <br /> <br /> Commercial volume 80 gpd. <br /> Home use concentration 45 mg/l-N (EHD standard). <br /> The flow concentration of 3,600 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 <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