stockpile must be sloped and a sump should be
provided.
Scrim reinforced geomembranes are commonly specified
for stockpile covers and liners. Due to their
higher strength properties, scrim reinforced
geomembranes can generally be thinner than
non-reinforced geomembranes.
For post treatment stockpiles, chemical testing is
usually required to determine if material is
contaminated or clean. Maximum stockpile size
should be based on the required frequency of
chemical testing. For example, if chemical tests
are required at a frequency of one per 1,000 cubic
meters (cubic yards), then stockpiles should be no
greater than 1,000 cubic meters (cubic yards) in
size.
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Stockpiles shall be constructed to isolate stored contaminated material
from the environment. The maximum stockpile size shall be [_____] cubic
meters yards. Stockpiles shall be constructed to include:
a. [A chemically resistant geomembrane liner free of holes and
other damage. Non-reinforced geomembrane liners shall have a
minimum thickness of [0.5] [_____] mm [20] [_____] mils. Scrim
reinforced geomembrane liners shall have a minimum weight of 20
kg/100 square meters 40 lbs. per 1000 square feet. The ground
surface on which the geomembrane is to be placed shall be free of
rocks greater than 12 mm 0.5 inches in diameter and any other
object which could damage the membrane.] [Pavement shall be used
as the liner system. Pavement shall be constructed in accordance
with Section [_____]].
b. Geomembrane cover free of holes or other damage to prevent
precipitation from entering the stockpile. Non-reinforced
geomembrane covers shall have a minimum thickness of 0.25 mm 10
mils. Scrim reinforced geomembrane covers shall have a minimum
weight of 13 kg/100 square meters 26 lbs. per 1000 square feet.
The cover material shall be extended over the berms and anchored
or ballasted to prevent it from being removed or damaged by wind.
c. Berms surrounding the stockpile, a minimum of 300 mm 12 inches
in height. Vehicle access points shall also be bermed.
d. The liner system shall be sloped to allow collection of
leachate. Storage and removal of liquid which collects in the
stockpile, in accordance with paragraph Liquid Storage.
3.5.2
Roll-Off Units
Roll-off units used to temporarily store contaminated material shall be
water tight. A cover shall be placed over the units to prevent
precipitation from contacting the stored material. The units shall be
located [as shown on the drawings] [_____]. Liquid which collects inside
the units shall be removed and stored in accordance with paragraph Liquid
Storage.
SECTION 02111
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