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M - Concrete and Backfill Guidelines. <br /> To ensure that no immediate or future damage is done to your Bravo Tank Sump Reducer <br /> components, make sure that your manhole skirt DOES NOT TOUCH OR REST ON THE TANK <br /> SUMP SHOULDER. The Manhole Skirt should be kept at minimum of 4" away from the tank sump <br /> shoulder. Follow the manhole manufacturers instructions for installing the manhole. Also follow other <br /> details provided by tank and/or engineering firm for tank driveway pad installation. <br /> Backfill your peagravel around the sump maintaining a minimum of 1' foot all the way around (if your <br /> site backfill is not entirely peagravel) and 4" minimum distance from the top edge of sump reducer. <br /> When peagravel is in place, use a 3mil or thicker plastic sheet to cover the surface of the peagravel <br /> no less than 2 feet away from the sump reducer wall. <br /> Secure this plastic barrier to the EXTERIOR OF THE MANHOLE SKIRT using duct tape. <br /> This prevents concrete from seeping too far down <br /> into the peagravel. <br /> i <br /> V <br /> Minimum ------- ° 1" to 1-1/2" ° `' <br /> 4 inches Distance <br /> between top <br /> a <br /> of sump ° <br /> reducer and ° <br /> peagravel <br /> a <br /> 3mil+ Plastic Barrier <br /> taped to manhole skirt <br /> Manhole Cover <br /> Manhole skirt <br /> C(3N�i2EYE ' <br /> J Sump Cover <br /> P <br /> O P Manhole <br /> Min 1' foot skirt min. <br /> peagravel all 4" away <br /> around sump from Tank <br /> 0 sump <br /> 0 shoulder <br /> Z . <br /> 22 ii-B401-DW-SP-10A <br />