Article: Backfill made easy: contractor develops system for difficult situations.(Innovations)

Sometimes backfilling is just about impossible. Ongoing construction can't be interrupted, or the site is congested or inaccessible.

Such problems led Richard Dunlop and Robert Griffin to develop a system that uses compressed air to deliver a variety of materials--sand and gravel, crushed rock and base materials, rock dust and decomposed granite, and amended topsoil--up to 450 feet from the site access point. Dunlop, a concrete contractor in Southern California for 30 years, says the system is especially useful in hard-to-reach areas.

This patented, self-contained system includes a two-axle 33,000 GVW flatbed truck, compressor, pump, hydraulically ...

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