Delta Remediation

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During this railroad spill seepage BioLogix was implemented to remediate and clean up fuel spilled at the site. Impacted soil in the spill area was excavated for off-site disposal. The fuel, however, percolated into the underlying soil, migrated into the subsurface, and seeped back to the surface, forming a sheen on the water of an adjacent pond.

The slope of the railroad embankment is very steep and grades downward to the pond. After the fuel began appearing on the surface water, sumps were installed near the base of the slope, and perched groundwater was encountered a few feet below the surface. The LNAPL on groundwater was as much as 0.2 feet thick. The assumed area of the LNAPL was approximately 1,500 square feet.

BioLogix was applied by injecting 204 Litres of a concentrated solution into the fill in the excavation area. The solution flushed through the impacted soil following the migration path of the fuel. During remediation, the LNAPL thicknesses were measured in the sumps. After each measurement, the LNAPL was bailed from the sumps.

Following bioaugmentation with BioLogix, LNAPL thickness appeared to increase in some locations. However, 90 days after bioaugmentation, the LNAPL was no longer present in the sumps and the sheen was no longer observed on the surface water. The following table shows representative LNAPL thickness measurements (in feet).

Sampling Location

Pre-Treatment

30 Days Post Treatment

60 Days Post Treatment

90 Days Post Treatment

1

0.04

0.06

No LNAPL

No LNAPL

10

0.15

0.12

0.08

No LNAPL

11

0.13

0.08

0.07

No LNAPL

15

0.12

0.10

0.18

No LNAPL

The treatment was successful in reducing the residual environmental impact of the fuel spill. The treatment

also verified the effectiveness of BioLogix for petroleum LNAPL situations.

Read more about our case study on the Drainage Ditch Soil Treatment

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