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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />nr>t'~"Q, <br />,~I _" ., .,1 . <br /> <br />2. The best soils profile consists of 3 feet of fine loamy sand underlain by 50 to 200 <br />feet of coarse sand and gravel, below which lies a layer of clay or another <br />impermeable substance. <br /> <br />3. Hydraulic loading employs an alternating sequence of flooding and drying a <br />particular basin. <br /> <br />4. Optimum hydraulic loading rate is determined by on-site experiments. A typical <br /> <br /> <br />peak loading rate of 400 feet/year consists of 2 or 3 weeks of flooding followed by <br /> <br /> <br />10 to 20 days of drying, utilizing a shallow water depth of one foot. <br /> <br />5. Maximum removal of nitrogen (60-80%) occurs at reduced hydraulic loading rates <br />of 200 feet/year where the flooding and drying schedules are designed to stimulate <br />denitrification. <br /> <br />Basin Management and Design <br /> <br />I. Regular drying ofRS! basins is necessary to allow for decomposition of suspended <br /> <br /> <br />solids that have accumulated on the basin bottom and to allow oxygen to enter the <br /> <br /> <br />soil for decomposition of organic material and denitrification of ammonium. <br /> <br />2. Water depth in the basin is kept shallow (one foot) to promote fast turnover of the <br />wastewater and minimize growth of suspended algae. <br /> <br />C-4 <br />