2.5 THREAD
A.
Thread used to seam the geotextile shall be polymer material with chemical
resistance properties equal to or exceeding those of the geotextile. The thread
shall be different color than the geotextile.
PART 3 - EXECUTION
3.1 INSTALLATION
A.
Drainage Geocomposite shall not be stockpiled or stored within the limits of
the area to be lined.
Drainage Geocomposite shall be installed in accordance with manufacturer’s
recommendations, and as shown on the Drawings and specified herein. If a
Drainage Geocomposite with a preferential flow direction is used, it shall be
installed oriented with the preferential flow direction perpendicular to the
contours unless otherwise approved by ENGINEER.
Care shall be taken to keep the Drainage Geocomposite clean prior to
installation.
Folds or excessive wrinkling of deployed Drainage Geocomposite shall be
removed to the extent practicable. CONTRACTOR shall exercise care not to
entrap stones, excessive dust, or foreign objects in the material. Drainage
Geocomposite shall be adequately weighted, using sand bags or equivalent
until the Drainage Sand and Crushed Gravel cover is placed.
Adjacent sheets of Drainage Geocomposite shall be overlapped a minimum of 4
inches, and shall be secured using ties, if appropriate for the material used,
placed at intervals no greater than 5 feet. Additional ties spaced at intervals
not exceeding 2 feet shall be used on seams running across slopes and located
in anchor trenches. Spot welding of the Drainage Geocomposite to the
geomembrane shall not be allowed.
The upper geotextile on adjacent panels of Drainage Geocomposite shall be
sewn together with a continuous seam in the field prior to placement of
overlying soil. All seams on sideslopes shall be oriented parallel to the slope.
The adjacent sheets of geotextile shall be overlapped a minimum of 6 inches
prior to seaming. All overlaps shall be such that the upslope sheet is placed
over the downslope sheet. No holes in the upper geotextile will be allowed. All
tie holes at horizontal seams shall be covered with a leistered nonwoven
geotextile patch.
File No. 3066.09 Drainage Geocomposite 02520 - 4 of 5 December 2017
