Installation of in-situ remediation system
LCM Environmental were asked to tender for a Site Decommission and Remediation project at a garage forecourt in Christchurch, Dorset. With the tender excepted we began planning the project in conjunction with Arcadis GMI.
We attended site and started to demolish the forecourt shop and car wash, once they were down and all materials were removed from site, we installed sheet piling to protect the boundary of the site and a public footpath, which ran alongside the boundary. Once the sheet piling was in place we began to excavate and dispose of soils from two potentially contaminated areas on the site.
From previous works and records we were aware that the site had a high water table and that the excavations would need to be de-watered using an on site separator before a remediation system could be installed, the extent of the water level is clearly visible in the images you can see to the right.
When the excavations were cleared and de-watered our teams installed three separate remediation systems, under the supervision of Arcadis GMI, once installed they were covered with shingle and any water trapped within the system was sprinkled with an Oxygen Releasing Compound (ORC) to aid the release of the Hydrocarbons within the water and soils.
The excavations were then backfilled using recycled crushed concrete and the site leveled off.
The remediation system was secured with a breathable cover so that the Oxygen Releasing Compound working on breaking down the Hydrocarbons could release its byproduct (Oxygen) into the air and not the soil.
The remediation system will stay in situ until it is deemed that the levels of Hydrocarbons have dropped to a satisfactory level.
If you would like any more information regarding our Ground Remediation services please