Tender: Curzon Wharf Phase 2 Contaminated Land Remediation – LNAPL Investigation, Excavation and Verification

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Contractor needed to carry out contaminated land remediation at Curzon Wharf Phase 2 where LNAPL has been identified in a monitoring well. The work comprises at least two stages: Stage 1 — dip each of the five nearby wells with an oil/water interface dip meter to measure LNAPL thicknesses, sample the wells and send samples for speciated TPH and BTEX laboratory analysis, then manually bale and dispose of any recovered LNAPL; Stage 2 — open-hole excavation at the original well to approximately 5.5 m below ground level, log sidewalls, record any oil seepage, segregate and test gross contaminated soils and undertake verification sampling of the excavation base and sidewalls while using a sump to pump and collect LNAPL and contaminated water until the source is removed. A third stage may be required depending on results, and an options appraisal of techniques (which may include additional remediation wells, further fluids recovery, further excavation and/or installation of a chemical oxidation zone) is required. A verification report is required on completion of the works.