b.
Open area not to exceed 36 percent.
2.
Filter cloths adjacent to all other type soils:
a. EOS no larger than the openings in the U.S.
Standard Sieve 212 micrometers No. 70.
b.
Open area not to exceed 10 percent.
To reduce the chance of clogging, no cloth should be
specified with an open area less than 4 percent or
an EOS with openings smaller than the openings of a
U.S. Standard Sieve Sized 150 micrometers No. 100.
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Provide a permeable, synthetic barrier sheet resistant to mildew, chemicals
in soil, stable under freeze-thaw cycles, which will not shrink or expand
under wet conditions, and will not unravel or become clogged during use.
Filter cloth shall have a minimum tensile strength of 534 N 120 pounds.
Allowable open area shall not exceed [36] [_____] percent and shall not be
less than [4] [_____] percent. Percent open area is defined as the
summation of open areas divided by total area of filter cloth. Equivalent
Opening Size (EOS) shall not be finer than the U.S. Standard sieve [212]
micrometers [_____] No. [70] [_____].
PART 3
EXECUTION
3.1
SURFACE PREPARATION
3.1.1
Soil or Granular Subgrade
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NOTE: Earth subgrades should be sloped from 0.5 to
1.0 percent. Sloped subgrade provides a path for
water or gas escape particularly if filter fabric or
a double liner with drainage system is used.
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Prepare subgrade in accordance with Section 02300 EXCAVATION. Remove
vegetation, boulders and rocks larger than 20 mm 3/4 inch in size and other
sharp objects. Fill in holes, including stake holes. Inspect subgrade
surface and correct defects prior to continuing construction.
3.1.2
Concrete
Provide concrete surfaces and pipe anchorages in accordance with Section
03300N CAST-IN-PLACE CONCRETE. Provide smooth surfaces with no sharp
projections or abrupt surface changes. Compact earth within 300 mm 12
inches of any concrete surfaces to 100 percent maximum density, optimum
moisture as specified in Section 02300 EXCAVATION.
3.2
CLEANING OF LINER SHEET
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NOTE: Some liner material are manufactured with a
surface bloom or surface cure that must be removed
prior to making seams. Consult with liner
manufacturers.
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SECTION 02661
Page 9
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