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Performa Inc. • • <br /> May 7,2003 <br /> Page 12 <br /> ' The following table indicates the categories, quantities, and total nitrogen concentration of waste <br /> water for the site. The average total nitrogen concentration of untreated domestic waste water for <br /> the site is estimated to be 26 mg/L-N. Please refer to the table for the calculation. <br /> ' Table 5. <br /> Estimate of total nitrogen concentration of wastewater. <br /> Category Average Average Average Average Mass <br /> Flow Flow Concentration mg/day-TN <br /> al/da <br /> Office Staff 214 808 75 60,628 <br /> ' Mechanics j,r 195 738 75 55356 <br /> Weekday Truck Drivers (excluding 1,429 5,407 75 405,536 <br /> shower and washing machine)3 IV <br /> ' Weekday Truck Drivers (shower 2,000 7,570 3 22,710 <br /> only) 3 is <br /> ' Weekday Truck Drivers(washing 1,786 6,759 3 20,277 <br /> machine only) �8 <br /> Weekend Truck Drivers (excluding 400 1,514 75 113,550 <br /> shower and washing machine) <br /> Weekend Truck Drivers(shower 560 2,120 3 6,359 <br /> only) <br /> Weekend Truck Drivers(washing 500 1,893 3 5,678 <br /> ' machine only) <br /> Totals: 7,083 26,809 L — 690,092 mg <br /> (volume) (mass) <br /> Resulting TN influent concentration(mass/volume): 26 mg/L-N <br /> ' Note: TN is total nitrogen as Nitrogen (1), gal is gallons,L is liters,mg is milligrams. <br /> 6.3 Quantity and Quality of Rain Water <br /> ' An estimate of the quantity and quality of rainfall was required for the analysis. The estimate of <br /> deep percolation of rain is based on the average monthly precipitation of rain fall and <br /> evapotranspiration for Stockton California. The estimate is monthly precipitation exceeds <br /> potential ET then the difference is potential deep percolation. This method does not consider <br /> runoff. <br /> O'S�A <br /> 1 <br />