The Pennsylvania Department of Environmental Protection said it expected to complete backfilling operations Friday at the massive sinkhole that opened up at the Rock Street public housing complex in ...

A truckload of gravel is unloaded at the site of last year’s Norfolk train derailment in January. The gravel along with clean stone was trucked in to backfill excavated areas during the remediation ...

Increases in backfill soil's thermal conductivity can cause sharply higher heating station fuel costs on heavy oil crude pipelines because the higher conductivity requires a higher initial temperature ...

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