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„I <br />III. NITRATE LOADING STUDY FINDINGS <br />A. WASTEWATER FLOW VOLUME PROJECTIONS AND CHARACTERISTICS <br />Wastewater Flow Volume Projections <br />To determine nitrate -nitrogen loading from any project, wastewater flow volumes must be <br />determined as accurately as possible. This project will have extremely low flow volumes since <br />there will be one toilet, one sink and one person in the Control Room. Other people who visit the <br />Control Room may use the Restroom; therefore, the following calculations quantify wastewater <br />flows under a worst-case scenario of use: <br />Wastewater volume: <br />1 toilet x 2 flushes/hr x 10 hrs/work day x 2 gals/flush (includes %2 gal hand washing) _ <br />40 gpd = Average Daily Flow (ADF). <br />40 gpd x 6 work days/wk x 50 work wks/yr = 12,000 gals/yr <br />12,000 gals/yr _ 365 d/yr = 33 gals effluent generated on average, every day of the year. <br />Wastewater Characteristics <br />The domestic wastewater generated from the facility will be composed of blackwater from the toilet <br />and greywater from hand washing. There will be no high organic loading from wine wasste, break <br />room use, etc. Additional wastewater constituents may consist of other liquids to the system, such <br />as coffee, juices, low -strength cleaning liquids, etc. Any food waste products must be handled as <br />solid wastes and placed in the garbage. <br />B. CALCULATED NITRATE -NITROGEN LOADING <br />NLS§ 3.4, 3.5, 3.6. The calculated nitrate -nitrogen impact to the soil and potentially to t_1e <br />groundwater is difficult to determine due to the large number of variables involved and variables <br />unknown at this time. These include: 1.) Impact from upgradient agricultural sources, 2 ) <br />Variability in wastewater flows, effluent nitrogen concentrations and dilution effects, 3.) Changes in <br />groundwater directional flow and elevation, 4.) The denitrification potential of the indigenous soils. <br />HANTZSCHEIFINNEMORE EQUATION <br />INWLL- d)+RNb <br />Nr = (I + R) <br />Where: <br />Nr = Resultant average concentration of nitrate -nitrogen in effluent recharge water - (ppm NG3-N) <br />I = Volume rate of wastewater entering the soil averaged over the gross developed area in in/yr <br />Nw = Total nitrogen concentration of wastewater assumed to be 90 mg N /L <br />d = Fraction (%) of nitrate -nitrogen combined loss in the soil due to denitrification. <br />R = Net Rainfall Recharge determined by the document found in Appendix D. <br />Nb = Background nitrate -nitrogen concentration of rainfall recharge, exclusive of wastewater influences <br />-5- <br />Chesney Consulting <br />