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November 19, 1999 Job Number-S99303 " Page 7 the presence of silt.and the slower percolation rates observed,the denitrification factor is estimated to be 25'%. To estimate the average concentration of the waste stream to the septic tank, the nitrate level of nearby well water was added to the aver se tic waste level a€a p el for humans,normally considered to be 45 mg/I=N.-- The nitrate level of the water from;the near by agricultural well was found.to be 3.2-mg/1-N. Therefore the total.nitrate concentration of the waste stream is estimated to be 48.2 mgA-N for"the site, To estimate-the average daily quamtiy,we used fifteen, allons er da . -tett gallons -er,da . g - P. y Per.employee and g p day.per customer for the proposed winery visitors center. The visitor center is, anticipating about 200'people per week and will be open Friday thru Sunday only. No more then. three employees will be working a_t tie facility: Typically.one-or two employees will be at the winery at any given time: } Table of Total Estimated Daily Usage (see worksheets in Appendix for calculations) Category Effluent usage for P - eoplrPer Day Daily effluent quantity per category each category Employees`: _ 15 gals 3 45 gaWday Customers , 10 gals 200/week, 284.9 gals/day (average 28.49,per'day) E' Total Avera a Flow: 329.9 ats/da ' Table of Results and Variables Used in the Mass Batance Analysis f (see worksheets in Appendix for calculations) Result of Denitrifi- Deep Rain Waste level Acres Analysis. cation"' Percolation fi Concentration 6 G 8.94 -N 25% 7.86 inches 48.2 m N 0.17 m N 1.75 antzshe N.N.,Finnemore:'E.J. 199.1,Predicating Ground-Water Nitrate-Nitrogen Impacts" Ground 7 -Water Vot.,30,No.4.