625.01 Description. This item shall consist of furnishing and
installing a geotextile fabric of the type specifie d at the locations shown on the plans or as directed by the Engineer.
625.02 Materials. Geotextile fabric shall be a woven or non-
woven synthetic fiber fabric listed on the Departme nt’s Qualified Products List and complying with AASHTO M 288, as f ollows: Type 1 shall comply with the requirements for Subsu rface Drainage, Class 2. This geotextile is used by placi ng against a soil to allow for long-term passage of water into a subsurf ace drain system retaining the in-situ soil. Type 2 shall comply with the requirements for Subsu rface Drainage, Class 3. This geotextile is used by placi ng against a soil to allow for long-term passage of water into a subsurf ace drain system retaining the in-situ soil. 504 Type 3 shall comply with the requirements for Tempo rary Silt Fence, Supported Silt Fence. This geotextile is use d as a vertical, permeable interceptor designed to remove suspended soil from overland water flow and shall be supported between posts with wire or polymeric mesh. Type 4 shall comply with the requirements for Tempo rary Silt Fence, Unsupported Silt Fence(Self-Supporting). Thi s geotextile is used as a vertical, permeable interceptor designed to remove suspended soil from overland water flow. Type 5 shall comply with the requirements for Perma nent Erosion Control, Class 1. This geotextile is used between e nergy absorbing armor systems and in the in-situ soil to prevent so il loss resulting in excessive scour and to prevent hydraulic uplift pre ssures causing instability of the permanent erosion control system . Type 6 shall comply with the requirements for Perma nent Erosion Control, Class 2. This geotextile is used between e nergy absorbing armor systems and in the in-situ soil to prevent so il loss resulting in excessive scour and to prevent hydraulic uplift pre ssures causing instability of the permanent erosion control system . Type 7 shall comply with the requirements for Pavin g. This geotextile is used as a paving fabric, saturated wi th asphalt cement, between pavement layers. Type 8 shall comply with the requirements for Separ ation, Class
2.This geotextile is used to prevent mixing of a s ubgrade soil and an aggregate cover material (subbase, base, select mat erial, etc.). May also be used beneath pavements where separation of two dissimilar materials is required but water seepage through the geotextile is not a critical function. Type 9 shall comply with the requirements for Separ ation, Class
3.This geotextile is used to prevent mixing of a subgrade soil and an aggregate cover material (subbase, base, select material, etc.). May also be used beneath pavements where separation of two dissimilar materials is required but water seepage through the geotextile is not a critical function. Type 10 shall comply with the requirements for Stab ilization, Class 1. This geotextile is used in wet, saturated conditions to provide the coincident functions of separation and filtration. In 505 some installations, the geotextile can also provide the function of reinforcement.
625.03 Construction Requirements. Types 1, 2, 5, and 6
geotextile shall be installed in such a manner that all splice joints are provided with a 12 ″ (300 mm) minimum lap. Types 5 and 6, when placed under water, and Types 8, 9, and 10 geotexti les shall be installed in such a manner that all splice joints a re provided with a 1 m (3’) minimum lap. Types 3, 4, and 7 shall be spl iced as shown in the plans. Care shall be taken during the placement and instal lation of the material to prevent damage to the fabric. Damages to Types 1 and 2 geotextiles shall be repaired by placing a geotexti le patch over the damaged area, extending 12 ″ (300 mm) beyond the perimeter of the damaged area. Damage to Types 5, 6, 8, 9, and 10 g eotextiles shall be repaired by placing a geotextile patch over the damaged area extending 3 ′ (1 m) beyond the perimeter of the damaged area.
625.04 Method of Measurement. Geotextile Fabric will be
measured by the square yard (square meter). Laps a nd material used for patching damaged areas will not be measured.
625.05 Basis of Payment. Work completed and accepted and
measured as provided above will be paid for at the contract unit price bid per square yard (square meter) for Geotex tile Fabric of the type specified, which price shall be full compensat ion for furnishing and placing materials; and for all labor, equipment , tools, and incidentals necessary to complete the work. Payment will be made under: Pay Item Pay Unit Geotextile Fabric (Type___) Square Yard (Square Met er)
Source: , Edition.