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Although some glass hotspots were successfully identified, <br />more verifications were impeded by the small number of TPs as <br />well as lack of trench-digging along the lines, which could give <br />more information. This particular limitation was due to time and <br />other resource constraints. In addition, 2-D ERT only produces ver- <br />tical cross sections of a dump, which tends to limit full understand- <br />ing of dumped material quantities. The use of 3-D ERT or <br />complementing different geophysical methods instead could give <br />Fig. 6.Results of TP excavations at Alsterfors dump; (a) wet soil from AL2; (b) demolition waste from AL1; (c) demolition waste profile with semi-wet soil beneath on AL1; (d) <br />glass waste from a hotspot on AL1; (e) glass waste from a hotspot on AL2; (f) rocks from an initially suspected hotspot on AL2; (g) semi-wet soil from AL2; (h) compact, dry soil <br />with stones from AL2. <br />R.N. Mutafela et al./Waste Management 106 (2020) 213–225 221