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7BUSINESS NUMBER OF NUMBER OF DAYS OF PER TOTAL EMPLOYEES CUSTOMERS/ OPERATION CAPITA WASTEWATER VISITORS TOTAL FLONN Jim Aartman 6 Trucks w/2 Approximately I/day 6 days/week 12+1+1=14 14 people x 15 Trucking drivers and I gals/day/person= (Existing) dispatcher 210 gals/day Lodi Truck 3 Mechanics Approximately 12/day 5 days/week 3+12= 15 15 people x 15 Center gals/day/person= (Existing) 225 gals/day A.M. Stephens 4 Office Employees Approximately 4/day 5 days/week 4+10+4=18 18 people x 15 Construction 10 Construction gals/day/person= (Proposed) Employees 270 gaWday TOTALS 47 people/ 705 gals of day effluent/day It is assumed there will be no cooking within kitchen/office areas in any of the existing or future buildings, and consequently no need for garbage disposals. Therefore, there should be no highly concentrated organic loading. The characteristics of the wastewater flow will be predominately blackwater from toilets, with a comparatively small volume of graywater from sinks, or other sources of graywater. Additional wastewater constituents may consist of coffee,juices or other similar type liquids to the system. No industrial or commercial chemicals, solvents, etc. are to be introduced into any of the septic systems. From the anticipated wastewater characteristics described above, the nitrogen emanating from the project may be at a higher concentration than what would normally be found in a typical domestic or household system. This can be attributed to the lack of a dilution effect that graywater from showers, laundry, and dishwashing would provide. The scientific literature cites nitrogen concentrations in residential septic effluent typically ranging from 17 mg N/L for basins, sinks, etc. to 140 mg N/L for toilet wastes. Therefore, considering a 70/30 percent usage for toilet water volume and sink water volume, respectively, a value of 103 mg N/L of septic effluent will be used to calculate nitrate-nitrogen loading for this project. A value of 66 mg N/L is typically used for residential calculations. B. PREDICTED NITRATE-NITROGEN LOADING The calculated or estimated nitrate-nitrogen impact to the soil and ultimately to the groundwater is difficult to determine due to the large number of variables involved. These variables include: 1.) Future installation methods and design of on-site septic systems, 2.) Impact from upgradient nitrate sources, 3.)Variability in wastewater flows, nitrogen concentrations and dilution effects from effluent and stormwater recharge, 4.) Changes in groundwater directional flow and elevation, and 5.) Denitrification potential within the soil environment and within the underlying aquifers. 9 C6eesixy Consulting