MnDOT specifications for geotextile under riprap

MnDOT specifications for geotextile under riprap.
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Geotextile Properties for Use Under Riprap
Geotextile Property	Test Method (ASTM) and Units	Type 3 (under Class I and Class II random riprap) (a)	Type 4 (under Class III and Class IV random riprap and hand-placed riprap, slopes up to 3:1) (a)	Type 7 (under Class III and Class IV random riprap, slopes > 3:1) (a)(b)
B1 Grab Tensile Strength minimum, each principal direction	D4632 lb	100	200	300
B2 Elongation minimum, each principal direction	D4632 percent	50	50	50
B3 Seam Breaking Strength minimum (c)	D4632 lb	90	180	270
B4 Apparent Opening Size (AOS) maximum (d)	D4751 U.S. Std. sieve size	50	50	50
B5 Permittivity minimum (e)	D4491 falling head sec−1	0.5	0.5	0.5