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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 />-,.. ^'7 <br />" r~ . . j ~ <br />V~~ <br /> <br />10. The cost of an RSl system is mainly dependent upon the underground flow system. <br />lfthe RSl system can be located so that the underground flow is accomplished <br />through gravity drainage (on a hillside), then the system cost is minimal when <br />compared to other city water purification plant methods. Higher costs can result if <br />it becomes necessary to drill and equip wells in order to drain the renovated water <br />from the system. Even assuming this worst case scenario, the cost of system <br />construction and land acquisition for a 180 acre site should not exceed 3 million <br />dollars. <br /> <br />11. RSl systems have few odor problems. <br /> <br />12. No problems are posed by the need to increase the scale ofa RSl system in order to <br />accommodate more effluent. <br /> <br />13. Because RSl systems are operated on alternating flood/dry cycles, the soils are <br />rejuvenated and will remain effective indefinitely, so long as properly managed. <br /> <br />Site Selection, Design and Management of RSI Systems <br /> <br />Soils and Hydraulic Loading <br /> <br />I, RSl systems require soils that are penneable enough to yield high infiltration rates, <br />yet fine enough to treat the effluent as it percolates downward. The best soils are in <br />the sandy loam to loamy sand range. <br /> <br />C-3 <br />