JPG undertook pre-remediation characterisation through ground investigation and groundwater assessments, followed by the remediation of a 40 acre complex former agrochemical works in Widnes, Cheshire. The site was required for commercial development.

The site was first developed in the mid 1960’s as an agricultural chemical works, producing pesticides and fungicide. Following many iterations of development, the works ceased production in 2009. The site was subject to plant decommissioning and demolition leaving hardstanding, roadways and below-ground structures.

The ground investigation delineated areas heavily impacted by organic contamination, which informed the remediation requirement for bulk excavation and treatment of soils. Extensive ground remediation works then commenced to remedy the site suitable for a commercial development. The ground remediation comprised the bulk excavation of 5,400m3 of material, predominantly contaminated by Ethofumesate, Toluene and organics. Impacted soils were placed in windrows and treated within an on-site ex-situ bioremediation system. Following validation and verification of excavated areas to prove compliance with the site-specific remedial criteria, the areas were backfilled. All historic underground concrete structures and bases were excavated and crushed to produce 6F2, which was retained for future site use and backfilling of excavations. Following ground remediation works, all excavated soils were retained on-site and stockpiled for future use. The remediation also included the removal of relic drainage, redundant infrastructure and the general re-profiling of the site to produce desired finish levels.

Following the successful completion and approval of the remedial works, the Infrastructure Estate Road was developed within the centre of the site prior to the commencement of on-site commercial development.

Client: Marshalls CDP
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