722.02Drainage Geotextile The Drainage Geotextile shall meet or exceed the

722.03 Erosion Control Geotextile The Erosion Control geotext ile shall meet or

exceed the requirements of Table 4. All property values, with the exception of AOS, represent MARV in the weakest principal direction. Values for AOS represent maximum average roll values. Both woven and non-woven geotextiles are acceptable; however, w oven "slit-film" geotextiles will not be allowed. Table 4 – Erosion Control Geotextile Property Values Other Properties Test Method Requirements Percent In-Situ Soil Passing #200 (0.075 mm) a <15% 15% to 50% >50% Geotextile class: Woven monofilament geotextiles All other geotextiles Class 2 from Table 1 (see below) Class 1 from Table 1 (see below) Permittivitya, b (minimum) ASTM D 4491 0.7/sec 0.2/sec 0.1/sec Apparent Opening Size (AOS) mm (maximum) b, c, d ASTM D 4751 0.43 0.25 0.22c, d Ultraviolet Stability (Retained Strength) ASTM D 4355 50% after 500 hours of exposure aBased on grain size analysis of in situ soil in accordance with AASHTO T 88. bThese default filtration property values are based on predomina nt particle sizes of the in-situ soils. In addition to the default permittivity value, the Resident may re quire geotextile permeability and/or performance testing based on engineering design for drainage sy stems in problematic soil environments. cSite specific geotextile design should be performed especially if one or more of the following problematic soil environments are encountered: unstable or highly erodable soils such as non-cohesive silts; gap graded soils; alternating sand/silt laminated soils; dispersive clays; and/or rock flour. dFor cohesive soils with a plasticity index greater than 7, geot extile maximum average roll value for apparent opening size is 0.30mm. 7-92 Woven Monofilament Erosion Control Geotextiles require Class 2 geotextile class designation. All other Erosion Control Geotextiles require Cla ss 1 geotextile class designation. The Erosion Control Geotextile class selection is appropriate f or conditions of equal or less severity than either of the following:

703.28 Heavy Riprap has stones up to 1000 pounds.

722.04 Separation Geotextile The Separation geotextile shall meet or exceed the

requirements of Tables 5 and 6. All property values, with the exception of AOS, represent MARV in the weakest principal di rection. Values for AOS repres ent maximum average roll values. Both woven and non-woven geotextiles are acceptable. Table 5 - Separation Geotextile Property Values Other Properties Test Method Requirements 7-93 Geotextile class See Table 6 Permittivity ASTM D 4491 0.02/seca Apparent Opening Size (AOS) ASTM D 4751 0.60 mm(maximum) Ultraviolet Stability (Retained Strength) ASTM D 4355 50% after 500 hours of exposure aPermittivity of the geotextile should be greater than that of t h e s o i l . T h e Resident may also require the permeability of the geotextile to be greater than that of the soil. Table 6 - Required Degree of S urvivability as Function of Subgr ade Conditions, Construction Equipment, and Lift Thickness Required Degree of Survivability as Function of Subgrade Conditions, Construction Equipment, and Lift Thickness a Low Ground- Pressure Equipment 3.6 psi Medium Ground-Pressure Equipment 3.6 to 7.3 psi High Ground- Pressure Equipment 7.3 psi Subgrade has been cleared of all obstacles except grass, weeds, leaves, and fine wood debris. Surface is smooth and level so that any shallow depressions and humps do not exceed 18 inches in depth or height. All larger depressions are filled. Alternately, a smooth working table may be placed. Low (Class 3) Moderate (Class 2) High (Class 1) Subgrade has been cleared of obstacles larger than small to moderate -sized tree limbs and rocks. Tree trunks and stumps should be removed or covered with a partial working table. Depressions and humps should not exceed 18 inches in depth or height. Larger depressions should be filled. Moderate (Class 2) High (Class 1) Very High (Class 1+)