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E-6 <br /> Part 2: Mound Systems <br /> A sewage treatment mound is a seepage bed elevated by clean sand Mounds must be <br /> fill to provide an adequate separation distance between the rock layer carefully <br /> in the mound and the barrier layer such as saturated soil conditions constructed <br /> or bedrock. The mound must be carefully constructed to provide <br /> adequate sewage treatment. <br /> Mound failures have usually been traced to improper construction <br /> practices. <br /> PERFORATED <br /> LATERALS <br /> SANDY LOAM SOIL . -_ ;_ -: <br /> ' //'•,/ / /. <br /> LAYER OF GEOTEXTILE f ,/ <br /> FABRIC OR 4 INCHES OF "~ ' -.- <br /> „--,{,7X /'/ ./ <br /> HAY COVERED BY " r� <br /> BUILDING PAPER :i '�/ z -7 •, <br /> /` �' <br /> PIPE FROM PUMP -Z..1,/ /% .' <br /> / <br /> 3/ -2'/ �% /�l / /SUREFANWA. .. . TER <br /> 6" TOPSOIL /. ' • , �' /, <br /> .4 ✓ <br /> �� _ r9 ,/y // IA z <br /> '' S f 12 <br /> QLEAN° �ppj _, K��,. <br /> 4 <br /> FILL SOD 36 y. (.. <br /> BROKEN YER- 4 _ r,,:.'-; •;;;,.; . <br /> BARRAIERRAL ? ' <br /> LAYER <br /> Figure F-6 <br />