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Fdetemiined er Flow Volume Projection ne nitrate-nitrogen loading from any project, wastewater flow volumes must be as accurately as possible. Typically, loading projections aze based on the maximum orer of employees and customers who may use the toilet/sink, etc. on a daily basis. Severale involved in estimating wastewater flows from a facility. Wastewater flow volume projections for facilities in unsewered areas have been historically and typically calculated under numerous guidelines and scenarios, as illustrated in the following list: 1. Published Data in the San Joaquin County Sewage Standards and scientific literature. 2. Number of bathroom fixtures(bathroom use per capita) for a facility. 3. Number of parking spaces for a facility. 4. Maximum number of people (i.e., employees,customers,etc.)for a facility. 5. Historical wastewater flow data from an existing facility. 1. The San Joaquin County Sewage Standards assigns 15 gallons per person for Industrial Buildings with no food cafeteria, 10 gallons per vehicle served for service stations, or 30 gallons per person for day workers at offices. 2. The number of bathroom fixtures(toilets)is unknown and difficult to estimate at this time. The Sewage Standards assign 150 gallons per toilet fixture (employee/public use). Since there are no project details at present, the only applicable criteria at this time is assigning 15 gallons per person for an Industrial/Commercial Building so that a total volume of wastewater flow can be obtained,which can then be correlated with the maximum number of people the property can support. Wastewater Flow Characteristics It is assumed there will be food preparation in any fixture on-site building. Therefore, concentrated organic loading may exist. Other characteristics of the wastewater flow will be predominately blackwater from toilets, graywater from sinks, and other sources of graywater. Additional .a.� wastewater constituents may consist of other liquids to the system. No industrial or commercial chemicals, solvents, etc. should be introduced into the wastewater treatment system. 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 from a household. The scientific literature cites nitrogen concentrations in septic effluent typically ranging from 17 mg N/L for basins, sinks, etc. to 140 mg N/L for toilet wastes. Therefore, con a 70/30 percent usage for toilet water volume LLandsink water volume, respectively, a valu of 103 gN/L tic effluent will be used to ulate nitrate-nitrogen loading for this pmt valof 66 m N/L is typically used for ential calculations, as indicated in the scientific liters 8 Chesney Consulting