Geotextiles in Embankment Dams - Association of State Dam Safety ...

1. Cover material depth required for equipment travel over geotextile,minimum: 13 [__] inches.I.14 [Place cover material with low ground pressure (LGP) wide trackcrawler type dozer.1. Ground pressure, maximum: 5 lb /in 2 .2. Maintain 1.5 feet of cover material under LGP tracks duringplacement.3. Maintain maximum of 1.5 feet of push height on dozer blade whenspreading material on slope areas.4. Push cover material upslope.]J. Drop height of cover material on to geotextile, maximum: 15 [ ].K. Cover geotextile within 14 days after geotextile placement.1. If covering geotextile with specified material is not possible within14 days, protect exposed geotextile with suitable cover approvedby the Government.2. Replace geotextile not protected.L.16 [Compact fill against geotextile in accordance with Section 02302 -Compacting Earth Materials.]3.03 SEAMINGA. Join adjacent sheets of geotextile by 17 [overlapping, sewing, or thermalwelding].B. Overlapped seams:1. Overlap minimum: 18 [ ].2. Upstream/upslope roll placed over the downstream/downslope roll.3. Weight or pin on 3-foot centers to secure the overlap duringplacement of cover material.a. Do not use pins when installed over geomembrane.13 Insert depth of cover material required14 Include when equipment travel required over geotextile to place cover material.15 Specify drop height depending on construction conditions. Typical values are 1 foot, 2 feet, or3 feet.16 Include when cover material is required to be compacted. Minimum density for geotextilecover material is often not required.17 Select type of seaming to be allowed.18 Specify overlap depending on subgrade firmness. Typical values are 12 inches, 24 inches, or 36inches.