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March 26,2003 Job Number:LG02=031 Page 8 Table 4. ' ted avera a daiily.flow of the septic system. Tota!estimated g - - g . Calculation Category Effluent usage for each.cate orySee{ footnote no: 5-employees k-13.5 Ernployees each working one{1} 1�gal ons/day/employee . r galionsldaylemployee= J eight(8)hour shift' seven(7)days per gPd week. f 3 all Ida /customer 30 custorilers x 3 30 customers visit the winery per day,- y gallons/day/custoiner average. The winery is open 7,days gpd per week.' Avera e Dail •Flaw; 155 d � Note: "gpd is gallons per day. Denitrification is an important process in septic syswrns.that normally occurs in the leach line whereby certain bacteria utilize the oxygen in the nitrate (NO3) and release nitrogen gas(NZ)to the atmosphere. Denitrification is expressed as a percentage, and the normally accepted range is F 10 percent to 35 percent. Soils with higher clay.content, moist soil conditions,high pH,.and organic:material denitrify about 35 percent and soils with very high sand content and fast. percolation rates are estimated to denitrify at a lower rate, about 10 percent to15 percent. Due to . the-mix of sandyand,siity'soiis,the denitrification factor is estimated to be 15 percent. . 5.3 Nitrates from Agriculture Leaching losses:of nitrate fertilizer occur.when soils have more incoming water,(rain or y irrigation)than the soil can hold. As water moves through the soil, the nitrate(NO3:)that is in soil solution moves along with the water. Ammonium (NH4+) forms of N have a positive charge and are held by the negative sites on the clay in the soil; therefore,NH4' forms of N leach very 1 � little.`In sands where there is very. little clay, ammonium•forms of N can leach. Coarse-textured sands and some muck soils are the.only.soils where ammonium leaching'may be significant. One . way to minimize N�leaching and denitrification is to minimize the time the N is'in the soil before 9 Crites;R.,-Tchobanoglous,G., 1998,Small and decentralized wastewater managernent systems: + McGraw-Hill series in water resources and environmental engineering;McGraw-l�i11 Boston edition,see Table .. . 4-3 page 172..bar category. !! G p �� Assoc.