FILTER FABRIC FOR SILT SCREEN FENCE
PHYSICAL PROPERTY
TEST PROCEDURE
STRENGTH REQUIREMENT
Trapezoid Tear
ASTM D 4533
55 lbs. min.
Permittivity
ASTM D 4491
0.2 sec-1
AOS (U.S. Std Sieve)
ASTM D 4751
20-100
2.1.2
Silt Fence Stakes and Posts
The Contractor may use either wooden stakes or steel posts for fence
construction. Wooden stakes utilized for silt fence construction, shall
have a minimum cross section of 50 mm by 50 mm 2 inches by 2 inches when
oak is used and 100 mm by 100 mm 4 inches by 4 inches when pine is used,
and shall have a minimum length of 1.5 m 5 feet. Steel posts (standard "U"
or "T" section) utilized for silt fence construction, shall have a minimum
mass of 1.98 kg per linear meter weight of 1.33 pounds per linear foot and
a minimum length of 1.5 m 5 feet.
2.1.3
Mill Certificate or Affidavit
A mill certificate or affidavit shall be provided attesting that the fabric
and factory seams meet chemical, physical, and manufacturing requirements
specified above. The mill certificate or affidavit shall specify the
actual Minimum Average Roll Values and shall identify the fabric supplied
by roll identification numbers. The Contractor shall submit a mill
certificate or affidavit signed by a legally authorized official from the
company manufacturing the filter fabric.
2.1.4
Identification Storage and Handling
Filter fabric shall be identified, stored and handled in accordance with
ASTM D 4873.
2.2
COMPONENTS FOR STRAW BALES
The straw in the bales shall be stalks from oats, wheat, rye, barley, rice,
or from grasses such as byhalia, bermuda, etc., furnished in air dry
condition. The bales shall have a standard cross section of 350 mm by 450
mm 14 inches by 18 inches. All bales shall be either wire-bound or
string-tied. The Contractor may use either wooden stakes or steel posts to
secure the straw bales to the ground. Wooden stakes utilized for this
purpose, shall have a minimum dimensions of 50 mm by 50 mm 2 inches x 2
inches in cross section and shall have a minimum length of 1 m 3 feet.
Steel posts (standard "U" or "T" section) utilized for securing straw
bales, shall have a minimum mass of 1.98 kg per linear meter weight of 1.33
pounds per linear foot and a minimum length of 1 m 3 feet.
PART 3
EXECUTION
3.1
INSTALLATION OF SILT FENCES
Silt fences shall extend a minimum of 400 mm 16 inches above the ground
surface and shall not exceed 860 mm 34 inches above the ground surface.
Filter fabric shall be from a continuous roll cut to the length of the
barrier to avoid the use of joints. When joints are unavoidable, filter
fabric shall be spliced together at a support post, with a minimum 150 mm 6
SECTION 01356A
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