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April 3,2001 <br /> Job Number: LGO1-074 <br /> Page 9 C <br /> the common occurrence of dark colored (organic layer) clayey surface soils, the denit <br /> factor is estimated to be about 25 percent. ` <br /> An estimate of the quantity and quality of effluent is required for the analysis <br /> the following information was used in the calculation. The deep percolation of rain <br /> estimated to be 7.86 inches and the calculation is shown on Plate 8. The nitrate concentration of <br /> rain fall was estimated to be 0.17mg/L-N.' The quantity of water use by each student and staff <br /> member for a school setting without cafeteria is 15 gallons per day per person. Each visitor was <br /> assigned the quantity of 5 gallons/day per visitor The average nitrate concentration of the typical <br /> residential septic waste is normally considered to be 45 mg/L-N.' The nitrate concentration of a <br /> septic waste for a typical school maybe slightly I than 45 mg/L-N. <br /> (see wor <br /> �y <br /> Category Quantity <br /> Students 15 gallons/day/person <br /> Staff 15 gallons/day/person <br /> Visitors 5 gallons/day/person <br /> The most important variab <br /> exits the septic tank before reachit <br /> MircoSeptec or Orenco Systems h <br /> waste stream within the septic tan] <br /> reported to deliver a typical concel __ _ -1 A v .Ls,L-1V in resioential application.9 The <br /> MicroSeptic System is reported to deliver a nitrate concentration lower than 5 mg/L-N <br /> determined in a residential system.10 The inflow of nitrogen may be slightly higher for a school <br /> when compared with a residential system. To allow for the possibility of a higher concentration <br /> of Nitrates in the waste stream associated with a school,the performance level estimate was <br /> doubled for the Orenco and MicroSeptic Systems. Table 5 presents the results of the nitrate <br /> loading balance for selected systems. <br /> pERSOy <br /> 1 <br /> Z � <br /> �j5 O L <br />