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Hughes Hardwoods <br /> May 5,2003 <br /> Page 7 <br /> Table 5. /// <br /> Estimated Quantity of Effluent. <br /> Category Uses Use per person Pea=flow Average daily flow <br /> Employees 2 employees/day, 20 gallons per employee 2 employees x 20 gpd Peak flow x 5.5/7= <br /> 5.5 days per week per day,5.5 days per =40 gals 31 gpd ADF <br /> week(=5.5/7). <br /> Customers 30 customers/day, 5 gallons per customer 30 customers x 5 gpd Peak flow x 5.5/7= <br /> 5.5 days per week per day,5.5 days per =150 gals 118 gpd ADF <br /> week(=5.5/7). <br /> Average Daily Flow: 1 31 gpd + 118 gpd =149 gals ADF <br /> 6.2 Quantity and Quality of Deep Percolating Rain Water <br /> An estimate of the quantity and quality of rainfall was required for the analysis. The average deep <br /> percolation of rain for the Stockton area is estimated to be 5.01 inches. Please refer to Plate 8 for <br /> det��ardingtl on of deep percolation of rain. The nitrate concentration of rain fall <br /> was ated to be 1 �g/L . <br /> 6.3 Denitrification Estimate <br /> Denitrification is an important process in septic systems that normally occurs in the leach field <br /> whereby certain bacteria utilize the oxygen in the nitrate (NO3) and release nitrogen gas(NO to <br /> the atmosphere. Denitrification is expressed as a percentage, and the normally accepted range is <br /> 10 percent to 35 percent. Soils with higher clay content,moist soil conditions, high pH, and <br /> organic material denitrify by about 35 percent and soils with high sand content and fast <br /> percolation rates are estimated to denitrify at a lower rate, about 10 percent to 15 percent. Due to <br /> the clayey soil which exist on the site,the denitrification factor is estimated to be about 25 <br /> percent for standard type septic system effluent. <br /> 5 Hantzshe N.,Finnemore,E.J. 1991,Predicating Ground-Water Nitrate-Nitrogen Impacts. Ground Water, <br /> ., Vol.30,No.4. <br /> PERS 1 <br /> r ; <br /> Z W <br />