12.1 Introduction .............................................................................................. 249
12.2 Background ............................................................................................... 250
12.3 Selected Site...............................................................................................254
12.4 Laboratory Column Trials....................................................................... 256
12.5 Pilot-Scale Barrier Design ....................................................................... 257
12.6 Groundwater Sampling and Analysis................................................... 263
12.7 Groundwater Monitoring Results.......................................................... 264
12.7.1 Hydraulic Analyses...................................................................... 264
12.7.2 Organic Analyses ......................................................................... 264
12.7.3 Inorganic Analyses ...................................................................... 267
12.8 Analysis of Iron Cores ............................................................................. 267
12.9 Full-Scale Reactive Iron Barrier Assessment........................................ 268
12.10 Additional Sampling and Analysis ....................................................... 270
12.11 Conclusions ............................................................................................... 273
References............................................................................................................. 273
12
Case Study of PRB Application for the
Remediation of Groundwater
James Stening
CONTENTS
12.1 Introduction
In February 1999, Orica Australia Pty Ltd (Orica) constructed the first reactive iron barrier in Australia, and indeed in the Southern Hemisphere.
Although at that time it was the 36th such barrier that the technology licensors, EnviroMetal Technologies, Inc. (ETI), had designed, it was the first time
they had designed one for such high volatile chlorinated hydrocarbon (CHC)
concentrations in a high-sulfate low-pH aquifer.
It was also one of the first times Orica had undertaken a groundwater remediation project. In October 1996, Orica’s predecessor, ICI Australia Pty Ltd *
* When the parent company ICI plc in the United Kingdom divested its major shareholding
in ICI Australia in 1997, a new independent Australian company was formed, which became
known as Orica in February 1998.
249
12.2 Background ............................................................................................... 250
12.3 Selected Site...............................................................................................254
12.4 Laboratory Column Trials....................................................................... 256
12.5 Pilot-Scale Barrier Design ....................................................................... 257
12.6 Groundwater Sampling and Analysis................................................... 263
12.7 Groundwater Monitoring Results.......................................................... 264
12.7.1 Hydraulic Analyses...................................................................... 264
12.7.2 Organic Analyses ......................................................................... 264
12.7.3 Inorganic Analyses ...................................................................... 267
12.8 Analysis of Iron Cores ............................................................................. 267
12.9 Full-Scale Reactive Iron Barrier Assessment........................................ 268
12.10 Additional Sampling and Analysis ....................................................... 270
12.11 Conclusions ............................................................................................... 273
References............................................................................................................. 273
12
Case Study of PRB Application for the
Remediation of Groundwater
James Stening
CONTENTS
12.1 Introduction
In February 1999, Orica Australia Pty Ltd (Orica) constructed the first reactive iron barrier in Australia, and indeed in the Southern Hemisphere.
Although at that time it was the 36th such barrier that the technology licensors, EnviroMetal Technologies, Inc. (ETI), had designed, it was the first time
they had designed one for such high volatile chlorinated hydrocarbon (CHC)
concentrations in a high-sulfate low-pH aquifer.
It was also one of the first times Orica had undertaken a groundwater remediation project. In October 1996, Orica’s predecessor, ICI Australia Pty Ltd *
* When the parent company ICI plc in the United Kingdom divested its major shareholding
in ICI Australia in 1997, a new independent Australian company was formed, which became
known as Orica in February 1998.
249