The site was investigated with windowless sampling boreholes and mechanically excavated trial pits. Creosote contamination was noted to have impacted the shallow soils below and adjacent to a timber treatment shed / bath.
The remediation strategy involved identifying and confirming the extent of the creosote contamination post demolition of the site by mechanical excavation. The contamination was initially thought to be limited to the chalk gravel layers but was later also noted to have migrated through fissures in the clays. In total, an area of soil 120m2 was excavated to depths of between c.2.5m and c.3.0m.
The impacted soils were locally removed, loaded directly into wagons and taken to landfill.
The remediation works were designed and completed in agreement with East Riding of Yorkshire Council.
Some residual creosote contamination was left insitu where it extended beyond the site boundary. It was recommended to the client that a barrier system (i.e. slurry trench or clay cut off wall) should be installed to prevent contamination migrating back onto the site. The excavation was backfilled with clean stone on completion.
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