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12 ii-B409-DW-10A
G - Concrete and Backfill Guidelines.
To ensure that no immediate or future damage is done to your Bravo Tank Sump Reducer
components, make sure that your manhole skirt DOES NOT TOUCH OR REST ON THE TANK
SUMP SHOULDER. The Manhole Skirt should be kept at minimum of 4” away from the tank sump
shoulder. Follow the manhole manufacturers instructions for installing the manhole. Also follow other
details provided by tank and/or engineering firm for tank driveway pad installation.
Backfill your peagravel around the sump maintaining a minimum of 1’ foot all the way around (if your
site backfill is not entirely peagravel) and 4” minimum distance from the top edge of sump reducer.
When peagravel is in place, use a 3mil or thicker plastic sheet to cover the surface of the peagravel
no less than 2 feet away from the sump reducer wall.
Secure this plastic barrier to the
EXTERIOR OF THE MANHOLE SKIRT using duct tape.
This prevents concrete from seeping too far down
into the peagravel.
Manhole Cover
CONCRETE
SLAB
Manhole skirt
Sump Cover
Min 1’ foot
peagravel all
around sump
1” to 1-1/2”
Distance
3mil+ Plastic Barrier
taped to manhole skirt
SAND OR SOIL
Minimum
4 inches
between top
of sump
reducer and
peagravel
Manhole
skirt min.
4” away
from Tank
sump
shoulder