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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 />('l:~ l": l. (1 n <br />0" ~ ,. _ I <br /> <br />2. This is accomplished by placing the RSI system on high ground so that the <br />renovated water can either gravity drain into a nearby stream, gravity flow into <br />man-made drains, or flow to an underground location where it can be pumped by <br />wells to the surface. The distance between the infiltration basins and the point <br />where the renovated wastewater leaves the aquifer again should always be as great <br />as possible. A rule of thumb is to allow for 300 feet of underground travel distance <br />and a detention time of one month. <br /> <br />Water Quality Improvement in Soil and Aquifer <br /> <br />I. Nitrogen - maximum nitrogen removal of 60-80% occurs when the flooding and <br />drying schedules are designed to stimulate denitrification. <br /> <br />2, Bacteria and Viruses - reduced to zero and not detected in renovated water. <br /> <br />3. Biochemical Oxygen Demand - reduced to zero and not detected in renovated <br />water. <br /> <br />4. Total Suspended Solids - reduced to near zero. <br /> <br />5. Phosphorous - removal increases with increasing distance of underground flow <br />system. After 30 feet of downward movement to the underlying aquifer, removal is <br />80%. <br /> <br />6, Fluoride - removal parallels phosphate removal. <br /> <br />C-6 <br />