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June 21, 2000 <br /> Job Number. L000-173 <br /> Page 11 <br /> Mass Balance Calculation <br /> — The nitrate loading analysis was conducted to determine the nitrate concentration of the <br /> combined septic effluent, wine barrel wash, and deep percolating rain water after biological <br /> denitrification of septic effluent. No agricultural sources were considered because the agricultural <br /> system is considered to be in balance. The estimated average concentration of the percolate was <br /> determined prior to mixing and diluting with existing ground water. Assumptions and calculations <br /> for the analysis are shown on Tables 5 and 6. The units of nitrate in used in the mass balance <br /> equation is nitrate-N with a maximum drinking water contaminate level of 10 mg/1- <br /> Table 5. <br /> General Assumptions, Quantities and Levels Regarding Nitrate Sources <br /> Source Nitrate Concentration Water Quantity Comment <br /> Ground water 2.1 mg/L as NO3 or(0.47 NA Nitrate level measured in well. <br /> mg/L-N <br /> Deep percolating rain 0.17 mg/1-N7.86 in over 20 Existing source see Table 4 for <br /> water acre site about details. <br /> 570,636 cf/yr of <br /> deep percolating <br /> min water <br /> Agricultural: Nitrate concentration of soil Drip irrigation Assumption.Due to regular <br /> soil amendments, amendment is unknown, rate is unknown. nitrate testing and vineyard <br /> fertilizer fertilizer was applied at 20 management,the agricultural <br /> gal/actyr CAN17 system is considered in balance. <br /> Wine barrel wash 9.9 mg/L-N" 20,000 to 50,000 Assumption. The 9.9 mg/L-N <br /> gals/yr or concentration is probably <br /> 55 to 137 gal/day conservative and assumes wine <br /> barrel wash water is less then the <br /> maximum drinking water <br /> contaminate level of 10 mg/L-N.' <br /> Litrfluent <br /> age/septic Human level(0.45mg/L-N) 26,280 gal/yr or See Table 3 for details. <br /> oncentration +Ground-water level(0.47 72 gal/day <br /> m - *0.8=36m -N <br /> _ 9 Hantzshe N.N.,Finnemore,E.J. 1991,Predicating Ground-Water Nitrate-Nitrogen Impacts. Ground <br /> Water Vol. 30, No. 4. <br /> 4 <br /> ♦w <br /> Z <br /> O <br /> 1�3oo <br />