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

C.3.0419 [Sewn seams:1. Interlocking or sewn twice.2. Thread:a. Contrasting color.b. Chemical resistance: Equal to geotextile.3. Sew geotextiles continuously. Spot sewing is not allowed.4. Sewn seam strength: Not less than 70 percent of parent materialstrength.]20 [RIPRAP INSTALLATIONA. Place riprap or backfill material so as not to damage geotextile.1. Type 1 riprap: Place directly on 4 oz geotextile with drop heightnot exceeding 3 feet.2. Type 2 riprap: Place directly on 16 oz geotextile with drop heightnot exceeding 1 foot.3. Type 3 riprap: Use with 4 inch gravel cushion over 16 oz.geotextile. Place with drop height not exceeding 1 foot.B. Before placing riprap, demonstrate that placing technique will not damagegeotextile or underlying geomembrane. If the demonstration does notshow that riprap can be installed without damaging geotextile, modifyriprap placing technique (such as reducing drop height, installingadditional layer of sacrificial geotextile, or installing additional gravelcushion).C. Begin riprap placement at toe and proceed up slope.]3.05 REPAIRSA. At placement, geotextile will be rejected if it has defects, rips, holes,flaws, deterioration, contamination, or damage.B. Replace or repair geotextile damaged during installation or placement ofcover in the following manner:1. Remove cover from damaged area of geotextile.2. Remove any soil or other material which may have penetrated torngeotextile.19 Delete if sewn seams not allowed or required.20 Delete if riprap not used on job. Modify as appropriate for other materials. If riprap is used,delete redundancies between this section and Section 02375 – Riprap.