(A) If required by the Engineer, geotextile filter fabric shall be used to wrap pipe foundation and pipe embedment, as specified herein and as indicated on the standard plans. The requirement for geotextile filter fabric may vary depending on groundwater and soil conditions.
(B) Geotextile filter fabric shall be a non-woven material consisting of polyester, nylon and/or polypropylene filaments formed into a stable network. The fabric shall be permeable, not act as a wicking agent, be inert to commonly encountered chemicals, be rot-proof and resistant to ultraviolet light.
(C) The geotextile fabric shall also conform to the following physical properties:
Property | Test Value | Test Method |
Property | Test Value | Test Method |
Weight | 5.4 oz/yd2 (minimum) | ASTM D3776/D5261 |
Grab tensile strength | 150 lb (minimum) | ASTM D4632 |
Elongation at break | 50% (maximum) | ASTM D4632 |
Puncture strength | 80 lb (minimum) | ASTM D4833 |
Burst strength | 300 psi (minimum) | ASTM D3786 |
Apparent opening size | #70 (maximum) | ASTM D4751 |
Permittivity | 1.0 sec1 (minimum) | ASTM D4491 |
UV resistance | 70% (minimum) | ASTM D4355 |
(D) The geotextile fabric shall be Mirafi 160N or approved equal.
(E) Wrap foundation material with geotextile fabric in a “burrito wrap” and overlap geotextile minimum 12 inches. Secure edges of geotextile to prevent unraveling.
(Ord. 2019-02, passed 4-25-2019)