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• � t f i <br /> I" • r <br /> 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 /> LAYER OF GEOTEXTILE �,� t <br /> FABRIC OR 4 INCHES OF ,/,� <br /> HAY COVERED BY ' <br /> BUILDING PAPER x'' ,• / �', �� <br /> PIPE FROM PUMP <br /> CLEAN WJOCK �/• ,�'�/• �, DIVERSION FOR <br /> ' <br /> 6" TOPSOIL ", i /� fISURFACE WATER <br /> � / � �� <br /> SLO <br /> CL <br /> -.a t.."'���� •�� i� 1� ,%I� ,'fir'/ <br /> p FILLD L <br /> mss•• ari,r.:; :. <br /> Bq JI R4 <br /> AYFR <br /> Figure E-6 <br />