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GIS (Geographic Information System), Mattawa Plains UXO Clearance, CFB Petawawa, Ontario

NOTRA was contracted by DCC to conduct a clearance to a depth of 3 meters in 6 Ha of heavily contaminated lands in the Mattawa Plains at CFB Petawawa. As part of the management and quality control and quality assurance process, GIS was used as to manage the extensive data base required for this job.

The job included visual surface clearance, a detector aided clearance (to 50 cm) and four rounds of geophysical clearances (150cm). All position mapping was conducted using a RTK GPS.

The data base includes a layer for each task of the clearance operation:

Visual surface clearance profile path and results;
Topographical features;
Clearance Grid Picket Locations and Names;
Detector aided clearance results;
Detector aided DQ Results(example);
Detector aided UXO findings;
Geophysical Data and Grid information, Pass 1;
Geophysical Anomaly Results, Pass 1(example);
Geophysical DQ Results, Pass 1;
Geophysical UXO findings, Pass 1;
FragPit Locations and Screening Results;
Geophysical Data and Grid information, Pass 2;
Geophysical Anomaly Results, Pass 2;
Geophysical DQ Results, Pass 2;
Geophysical UXO findings, Pass 2;
Geophysical Verification Data and Grid information, Pass 1;
Geophysical Verification Anomaly Results, Pass 1;
Geophysical Verification DQ Results, Pass 1;
Geophysical Verification UXO findings, Pass 1;
Geophysical Verification Data and Grid information, Pass 2;
Geophysical Verification Anomaly Results, Pass 2;
Geophysical Verification DQ Results, Pass 2; and
Geophysical Verification UXO findings, Pass 2.

All data was imported from the various sources daily through a common exchange such as CVS format, from field data loggers, field books and geophysical software. The GIS programs available include ESRI ArcGIS, Oasis Montaj (Geosoft) and MapInfo (and Vertical Mapper).

For Mattawa Plains, a total of 18136 target locations are summarized in the GIS data base. All Information for the 5,700 kgs of metal and 80 UXOs removed is immediately accessible in the mapping options or data base options of the GIS model.

Using mapping features of common GIS software, the entire job process can be monitored and reviewed. The GIS data base also serves as a permanent record of the clearance operation.

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