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6 <br /> Conc usions <br /> There is now ample evidence from experience in a <br /> wide variety of locations to conclude that: <br /> '1 . Sewage electro- smosis systems will function well <br /> in siils with percolation rates well above normally <br /> allo. able limits . <br /> 2 . The system minimizes plugging of the trench- <br /> soil interface by a combination of alternate wetting and <br /> drying and probably by oxygen generated by hydrolysis . <br /> 1 <br /> 3 . The electrical potential appears to more-or-less <br /> perm nently increase the permeability of soils. <br /> 4 . The system requires a minimum amount of <br /> main enance beyond the regular and proper maintenance of <br /> the re-treatment system. <br /> Limi ations <br /> The system is not intended for installation where <br /> prol nged high groundwater levels will cause flooding of <br /> the seepage trenches . • <br /> Special care is required in designing systems for <br /> relatively steep side-hills , particularly with respect to <br /> place ent of the anodes and cathodes . <br /> Site evaluations , including the direction and <br /> magnitude of existing natural electrical potential and soil <br /> electrical conductivity must be made by an experienced <br /> installer. <br /> Source of Data <br /> The Consultant has observed a variety of systems in <br /> the M$.nneapolis region . He has observed official letters <br /> authorizing issuance of buildinc permits on certain lots <br /> only . f the electro-osmosis system is used. He has <br /> inter- iewed seva `d installers of electro-osmosis <br /> systems and has :._.:am_. _._. rlu�:� _.e <br /> �' - r� <br /> ,Is detailed records of system <br /> perfctman:2e an,.. t_s is . <br />