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.
Minimum 4 inches
between top of sump reducer and peagravel
3mil+ Plastic Barrier
taped to manhole skirt
Manhole Cover
Manhole skirt
CONCRETE
SLAB
SOIL |
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| Sump Cover | |
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| Min 1’ foot |
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ORSAND | peagravel all |
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around sump |
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1” to 1-1/2” 
Distance
Manhole skirt min. 4” away from Tank sump shoulder
12ii-B409-DW-10A
