Prior to geotextile placement, the area should be prepared and shaped to the lines and grades as directed.
The area should be cleared of all large stones, roots, or debris.
b. Depressions or holes should either be filled, or the fabric placed to conform to the surface, in order to
prevent the bridging and potential rupture of the geotextile across the hole.
c. The geotextile should be installed in accordance with the plans and specifications, or as directed.
d. The geotextile should be placed in intimate contact with the soil without any folds or excessive wrinkles
(both longitudinally and transversely), but need not be placed in tension before placement of the riprap
or other cover materials. Special care shall be taken to avoid damaging the geotextile. The geotextile
should be covered the same day as it is placed, if possible. In any event, no geotextile materials shall be
exposed to ultraviolet light for a period of more than 7 days, in order to minimize any strength loss that
may occur in some geotextiles. The protective shipping cover must not be removed from any rolls of
geotextile until the day that it is to be installed.
e. The geotextile may be joined by overlap, sealing, or sewing. The minimum overlap distance in the
transverse or longitudinal direction shall be 2 feet (610 mm), except where placed under water where the
overlap must be a minimum of 3 feet (915 mm). Sealed or sewn seams will be allowed if the overlap in the
transverse or longitudinal directions is a minimum of 6 inches (150 mm), and the sealed or sewn grab
tensile strength is equal to the minimum value of the geotextile (shown on Table 1-10-6) in the weakest
principle direction. The contractor will be allowed to patch small rips or tears in the fabric when
approved by the engineer, and in accordance with the foregoing requirements.