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It will be a requirement of the Environmental Health Department to orientate the leachlines as high in elevation as practical within the leachfield area. This procedure may have the leachlines between six inches and one foot below final leachfield grade. Therefore, the effluent must be pumped to the leachfield. Pumping of effluent will also create surge capacity for large functions such as weddings. A filter bed may be considered if the proposed leachfield area becomes to constrained idue to any number of factors. The final leachfield design must also incorporate a 100 percent t replacement area. / B. WASTEWATER FLOW PROJECTIONS AND CHARACTERISTICS To adequately determine nitrate-nitrogen loading from the project, wastewater flows must be determined as accurately as possible. Loading projections are based on the number of Eagal Lake members who may potentially use the toilet/sink, etc. on a daily basis. This incorporates an acceptable safety factor. It is our understanding from Mr. John Eagal that there will be a maximum of 34family membershifts sold. .I<t�]1 be ass»mPd that nn ' .der from each e 30 membershi swill c' ' y (seven days per week) during the proposed seven months of operation. The facility will operate from April through October and be completely closed the remaining winter months of each year. As conveyed by Mr. Eagal,the Ski Shop will have a "barbeque style" kitchen in which there will be minimal indoor cooking, as would be the case with a cafeteria or restaurant. There will be, however, dishwashing. No garbage disposals should be installed in the sinks. The characteristics of the wastewater flow will be blackwater from toilets, and graywater from sinks, showers and dishwashing. Additional wastewater constituents may consist of coffee, juices or other similar type liquids to the system. No industrial or commercial chemicals, solvents, etc. should be introduced into any of the septic systems. From the anticipated wastewater characteristics described above, the nitrogen emanating from the project may be similar to what would normally be found in a typical domestic or household system. In determining nitrogen concentrations of septic influent and effluent, per capita intake of nitrogen per day must be estimated. The average American consumes between 70 and 140 g of N/day. Since nitrogen comprises 16% of the weight of the average protein, 16% of 70 g N 11. Ica ' and 16% of 140 g N = 22 g N/capi The average of these two values is ` 17 N/ca ita/da of theoretical influent. The concentration of nitrogen in septic system effluent is normally specified in the scientific' literature as units of mg NIL. Unfortunately, these units superimpose wastewater flow variability onto nitrogen influent variability,thus creating even greater variability. One researcher, (Bauman), has averaged the means from 20 other studies to arrive at a concentration of 62 f 21 - mg NIL in septic tank effluent. If the above figure for wastewater discharge is estimated at 35 gals/member/day (133 liters) and using the figure of 17 g N/cap/day excreted= 17 g- 133 L = F 128 m NIL/da estimat-,d for the ro osed r ',ect. This concentration will be the estimated nitrogen loading in the effluent discharged throughout the project. 7 Va&y Ag research