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Floadings <br /> c System Contribution: Data from various sources including independent <br /> ators, the U.S. EPA, and the Regional Water Quality Control Board estimate nitrogen <br /> from domestic sewage to be 12 grams N per person per day (g N/capita/day) to a high of <br /> f ta/day. Hantzche and Finnemore (1992) correlated septic tank effluent concentrations <br /> mutped by water discharge to the septic tank. They formulated a water discharge of 100 <br /> gal/capita/day with an effluent concentration of 30-60 mg N/L. It is our opinion that 60 mg N/L <br /> is most accurate for this type of operation. The following calculations determine nitrate-nitrogen <br /> loading from septic system contributions: <br /> 12 people max. on-site x 100 gals/day= 1200 gals x 3.79 L/gal=4548 L/d x 60 mg N/L = <br /> 273 grins N/day x 365 days/yr= 100 kg N/yr x 2.2 lb/kg=220 lbs N/yr. <br /> 4.) DAIRY NITROGEN PRODUCTION CALCULATIONS <br /> The Quaresma's plan to sell all of the manure solids Produced by the dais for off-site use. <br /> However,the following calculations demonstrate the facility is completely self-supporting and <br /> may apply both liquid and solid manure forms on all cropland acreage controlled by the <br /> Quaresma's without overload. The total nitrogen excreted from dairy animals is difficult to <br /> quantify since the rates of several important nitrogen transformation processes can only be <br /> estimated. Secondly,the fact that the animals will be confined under two different housing <br /> structures (loafing vs. freestall)during different times of the year creates differences in nitrogen <br /> loading. The following calculations incorporate the use of animal units (AU) for the Holstein <br /> dairy cow to formulate nitrogen loading. The nitrogen loading calculations for the milk cows is <br /> based on exclusive use of freestalls. The nitrogen loading calculations for the dry stock is based <br /> on exclusive use of the loafing barns with flushed feed alleys. This provides a more conservative <br /> approach for total nitrogen loading. The animal numbers are the maximum number the facility <br /> can support, with all calculations on the following three pages: <br /> 7 <br /> Valky sig Research <br />