EAGLE CORR PE™ * - JM Eagle

In soils where ground water fluctuations occur, coarse or open-gradedmaterial placed adjacent to a finer material may be infiltrated by those fines.Such hydraulic gradients may arise during trench construction when waterlevels are being controlled by various pumping or well-pointing methods, orafter construction when permeable under drain or embedment materialsact as a “French” drain under high groundwater levels. Downward percolationof surface water may carry fine materials down into more coarse, opengradedbedding materials if the trench is not properly designed and constructed.The gradation and relative particle size of the embedment andadjacent materials must be compatible in order to minimize migration. As ageneral precaution, it is recommended that if significant groundwater flowis anticipated, avoid placing coarse, open-graded materials adjacent tofiner materials, unless methods are employed to impede migration, such asthe use of an appropriate stone filter or fabric along the boundary of incompatiblematerials.4.12 Parallel pipe installationStorm sewer conduits and underground drainage systems can be installed inparallel pipe configurations provided that the haunch zones are compactedwith the proper amount and type of embedment material. Class I, II, andIII materials are suitable for foundation and embedment. Minimum spacingbetween parallel pipes shall meet the minimum criteria set forth in Table 9.Parallel PipeInstallation Minimum SpacingNominal IDIN (mm)Minimum spacingIN (mm)ID 24 (600)ID/2Table 950 EAGLE CORR PE INSTALLATION GUIDE