Changes

#Install each piece of the first chamber row, as per the manufacturer’s instructions, until the entire length of the chamber is in place. The ends of the chamber may be installed once perimeter stone is being applied to the ends of the rows, if desired, to ensure ease of inspection.

#Install each piece of the first chamber row, as per the manufacturer’s instructions, until the entire length of the chamber is in place. The ends of the chamber may be installed once perimeter stone is being applied to the ends of the rows, if desired, to ensure ease of inspection.

#With a stone conveyor or excavator, begin placing perimeter stone. For domed chambers, place stone along the centreline of the chamber rows. Doing so will distribute stone to either side of the chamber, anchoring each side in roughly equal proportion.

#With a stone conveyor or excavator, begin placing perimeter stone. For domed chambers, place stone along the centreline of the chamber rows. Doing so will distribute stone to either side of the chamber, anchoring each side in roughly equal proportion.

#Backfill the excavated area with perimeter stone to the depth specified in the contract documents. Ensure that the depth of stone does not differ by more than 300 mm between the sides of the chamber rows.

#Backfill the excavated area with perimeter stone to the depth specified in the contract documents. Ensure that the depth of stone does not differ by more than 300 mm between the sides of the chamber rows at any point during the backfilling process.

#Once backfilling is complete, level the perimeter stone with a small dozer. Only push material in the direction parallel to the rows.

#Once backfilling is complete, level the perimeter stone with a small dozer. Only push material in the direction parallel to the rows.

#If specified by the design, roll geotextile parallel to rows over the top of stone. Provide sufficient overlap, as specified by the manufacturer.

#If specified by the design, roll geotextile parallel to rows over the top of stone. Provide sufficient overlap, as specified by the manufacturer. STEP does not recommend the use of geotextiles, however.

'''Note:''' where many rows of chambers are being installed, it may be advisable to construct the chamber rows piece-wise as the application of perimeter stone progresses to provide space for excavators to apply the stone from on top of the stone foundation. See the adjacent photo for an example.

'''Note:''' where many rows of chambers are being installed, it may be advisable to construct the chamber rows piece-wise as the application of perimeter stone progresses to provide space for excavators to apply the stone from on top of the stone foundation. See the adjacent photo for an example.