After radar stragraphic analysis and ground truthing of the GPR transects ArcGIS was used to create a sediment thickness map. A map showing 1062 depth points (above) was interpreted from the 64 usable GPR transects and then entered into Excel and joined to the matching GPS file. The remaining GPR profiles were 1) collected in the summer and could not be used due to inaccurate GPS positions or 2) several profiles and antennae frequencies were not of high enough resolution to differentiate the industrial organic waste.
An industrial organic waste sediment thickness map (above) was created by using a Triangulated Irregular Network (TIN) analysis. The thickest industrial organic waste layers are on the north-west portion of HML which correlates well with the documented sawmill locations. Using the TIN derived sediment thickness map, a volume of 412,526.18 cubic meters of industrial organic waste is estimated.
Another spatial interpolation tool in ArcMap (Kriging) was used to create a cartographically pleasing sediment thickness map (Figure 13). The map shows that the majority of the lake has at least 1 meter of industrial organic waste on the lake bottom. The Kriging map better illustrates the spatial variation with the quantity of interpolated GPR transects obtained on HML but adjustments need to be made to more accurately calculate the volume of industrial organic sediment.