Jill Thompson, Jacobs

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Chlorinated Solvent and Honing Oil Remediation
Jill Thompson
Graduate GeoEnvironmental Scientist
21/01/2019

2. Introduction
2
Site Introduction
Ground Investigation
Chlorinated Solvents History
Chlorinated Solvents Remediation
Honing Oil History
Honing Oil Remediation

3. Problem?
3
Honing Oil seeping through wall
Groundwater bailer with LNAPL horizon

4. Ground Investigation
• 9 Boreholes
• Underlain by Chalk Aquifer
• Elevated Chlorinated Solvents
• Groundwater monitoring from 2000
• Honing oil spill identified in 2012
4

5. Chlorinated Solvents Spillage 1980s
• Former Dry Cleaners 1980s – Use of Tetrachloroethylene (PCE)
• Above Ground Storage of Trichloroethane (TCA)
• Monitoring Natural Attenuation since 2000
• Remedial Action in 2015
5

6. Chlorinated Solvents Remediation
• Reductive De-Chlorination
• 3D micro emulsion (Free Lactic Acid)
• Hydrogen Release Compound
6

7. Chlorinated Solvents Deployment
7
3D Microemulsion
Hydrogen Release

8. Current Data
8
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
110
111
112
113
114
115
116
117
118
119
120
Concentration(µg/l)
GroundwaterElevation(mAOD)
Figure B.1 Groundwater Elevation vs Contaminant Concentrations over
Time - MW6A
GW
elevation
PCE
TCE
Control
Level
10,200μg/l
Date
Remedial Treatment Product
HRC added to MW6A

9. Honing Oil
9
Honing Oil Boreholes
Honing Oil Spill Location

10. Honing Oil Remediation
• Vacuum Extraction (22,730 Litres)
• Insitu Chemical Oxidation
• Enhanced Aerobic Bioremediation
10
Pre and Post Remediation

11. Current Data
11

12. Summary
• Monitoring since 2000
• Remediation 2015
• All techniques shown to be effective
• As of 2019 reduction of monitoring
12

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