REP21624

• Permit No: M1977573
• IBM Index Class Name: Report
• Doc Date: 1/23/2004
• Doc Name: Report on Permit
• From: Southwestern Ecological Services
• To: DMG
• Media Type: D
• Archive: No

Saturated Hydraulic
Conductivity
Fine Soil
particle size (inches)
Saturated Hydraulic
Conductivity
2.2 TOPSOIL
reported for design of
filter fabric ASTM D 2934/
ASTM D 5089
See ASTM D 422
Filter Criteria - max
size 3.0 inches
reported for design of
filter fabric ASTM D 2939!
ASTM D 5089
Topsoil shall consist of natural, friable soil that is representative of
soils in the vicinity which produce heavy growths of crops, grass, or other
vegetation and is reasonably free from underlying subsoil, clay lumps,
objectionable weeds, litter, brush, matted roots, toxic substances, or any
material that might be harmful to plant growth or be a hindrance to
grading, planting, or maintenance operations. Soil from ditch bottoms,
drained ponds, or eroded areas shall be dried to an approved moisture
content prior to use. Topsoil shall also comply with following criteria:
Topsoil
pH
Organic content (o)
Saturated Hydraulic
Conductivity
2.3 GEOSYNTHETIC FABRIC
5-7 ASTM D 4972
20 or greater ASTM D 2974
reported for design of
filter fabric ASTM D 5084
The geotextile fabric shall serve multiple functions.
• provide strength for retention of the lower soil lifts as a
retaining wall and intercept the estimated potential failure plane
of the soil mass
• act as a filter to retain different gradations of materials
• provide a permeable surface to allow water seepage for vegetation
and prevent pore pressure build-up behind the wall
The geotextile shall be a pervious sheet of plastic yarn as defined by ASTM
D 123. The geotextile shall equal or exceed the minimum average roll
values listed in TABLE 1, MINIMUM PHYSICAL REQUIREMENTS FOR
RETAINING/DRAINAGE GEOTEXTILE. Strength values indicated in the table are
for the stronger principal direction.
02340-5