| 1. |
Design
& Engineering |
| |
Design
& Engineering was completed primarily on-site, with
support provided from Canadian partners on an as required
basis.
|
|
Senior
design engineers were relocated to Brunei for on-site
design & engineering. |
|
Full
design and CAD facilities were set up at the site. |
|
Design
& Engineering was completed during the initial 3 months
following project award. |
| 2. |
Contamination
Volume Surveys |
|
Surveys
were conducted to determine the volume of sludge and contaminated
soil. |
|
The
surveys were completed on a 20 m grid throughout the basin
areas. |
|
Samples
were collected for petroleum hydrocarbon analysis with
elevations established using “total station”
surveying equipment. |
|
The
data was inputted into computer models to determine the
volume of sludge and soil to be excavated. |
|
The
models were also used to generate cross-sections and contour
diagrams of the excavation limits. |
| 3. |
Set
Up & Commissioning |
|
Essentially
all new treatment equipment was procured for completion
of this project. |
|
The
major treatment systems were mobilised from North America
and Australia. |
|
Set
up and commission was completed by August 2000. |
| 4. |
Floating
Product Recovery & Treatment |
|
The
first phase of remediation encompassed recovering and
treating the floating product deposited in the Main Channel
in 1999. |
|
A
storage pond, complete with a High Density Polyethylene
(HDPE) liner, was constructed for temporary storage of
the product prior to treatment. |
|
Pumping
of the product from the Main Channel to the holding pond
was completed in Spring 2000. |
|
From
the holding pond, the product was pumped to the “Oil
Treatment System” (described in subsequent slides). |
| 5. |
Sludge
& Soil Excavation |
|
Excavation
of the basins is being conducted in 4 phases |
|
|
|
Well
point dewatering is required to facilitate sludge &
soil excavation due to the shallow watertable. |
|
The
excavated material is transported to temporary stockpiling
areas awaiting blending for feed preparation purposes. |
|
All
wastewater from dewatering, as well as runoff from the
sludge/soil storage areas, is collected and treated through
the Wastewater Treatment Plant. |
| 6. |
Feed
Preparation |
|
A
consistent feed improves operational performance of the
LTTD Plant. |
|
For
feed preparation purposes, the sludge and soil is blended
together to create a consistent feed, with a hydrocarbon
content of approximately 10%. |
|
Following
feed preparation, the material is transferred to a designated
storage area awaiting treatment. |
| 7. |
LTTD
Plant Operations |
|
The
sludge and contaminated soil is treated through the Low
Temperature Thermal Desorption (LTTD) Plant. |
| 8. |
Oil
Treatment Operations |
|
Two
Systems are provided on-site as part of the oil treatment
operations: |
|
1.
Liquid Sludge Pretreatment System.
2. Oil Treatment System |
|
Oil
treatment operations for this project are subcontracted
to Macodril Sdn. Bhd. |
| 9. |
Wastewater
Treatment |
|
The
Wastewater Treatment Plant treats water from the following
sources: |
|
1.
LTTD Plant & Oil Treatment System
2. Surface water runoff from work areas
3. Groundwater from the well point dewatering system |
|
The
treatment capacity of the plant is approximately 150 m3/hr
and includes: |
|
1.
Coalescing Oil/Water Separator
2. Dissolved Air Flotation (DAF) Unit
3. Step Aerator |
|
Treated
water is discharged to the Sungai Bera river following
confirmation of the treatment standards. |
| 10. |
Laboratory
Analysis |
|
Laboratory
analysis of sludge, soil and water samples is completed
at SBRJV’s laboratory facility located at CIC in
Kuala Belait, Brunei. |
|
The
lab includes 2 Gas Chromatographs (GCs) for analysis of
TPH and BTEX. |
|
Samples
are submitted to the lab on a daily basis to confirm compliance
with the established remediation criteria. |
|
In
addition, SBRJV operates an on-site field lab for BSW
analysis of oil and Retort Oven analysis. |
| 11. |
Backfilling
& Site Restoration |
|
Backfilling
of the basins is initiated following excavation of sludge
and contaminated soil. |
|
Imported
sand and treated ash is used for backfilling purposes. |
|
The
entire site will be re-vegetated following completion
of excavation and backfilling operations. |
