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7SURFACE WATER INFORMATION water retention exists for the parcels north of State Route 132. On-site7can ponds must be constructed for the proposed improvements on the subjecsPotential nitrate impact from stormwater impoundments on this south be viewed in two ways: Stormwater will percolate from retention ponds through the soil profile and will carry an indeterminable percentage of soil nitrate into the water table for an indeterminable period of time. However, since the retention ponds will be excavated into the soil profile, the distance between the floor of the ponds and the static water table will be reduced,thereby reducing the nitrate potential entering the water table. Secondly, stormwater runoff from roofs, paved, concreted and aggregate base compacted areas should contain no nitrate. Consequently,this non- nitrate laden water will create a dilution effect upon entering the water table. NITRATE LOADING STUDY CALCULATIONS F. WASTEWATER FLOW PROJECTIONS AND CHARACTERISTICS In accordance with requirements of the EHD, this Nitrate Loading Study quantifies the number of people (customers and employees) for the two subject parcels north of SR 132. Since details of the proposed Truck Stop facility are unknown at this time, in addition to the fact that this facility will be required to have additional effluent treatment, nitrate loading calculations were not done for this parcel. To determine nitrate-nitrogen loading from the existing facility,wastewater flows must be determined as accurately as possible. Typically, loading projections are based on the maximum or total number of employees and customers who may potentially use the toilet/sink, etc. on a workday basis. It is assumed that the only cooking will be within the Bogetti's Orchard Restaurant. Therefore, there may be higher organic loading. The characteristics of the wastewater flow will be blackwater from toilets and graywater from sinks, showers, laundry and 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 the septic 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. 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 AA value of 66 mg N/I is typically used for rP� +Pr* �i calculations. 7 CFiesney Cotuulting