Scope of survey:
Resistivity imaging instruments GD-10 Resistivity and IP Imaging System / GD-20 Resistivity and IP Imaging System to guarantee efficiency and accuracy.
Co-use of rapid-detection instruments and equipment to ensure targeted and representative survey.;
Case 1: Geophysical Instrument for Petrol Station Oil Leakage Survey
Objective: Delineate the leakage areas
Technical methods: GPR and ERT resistivity
Analysis and interpretation of survey results
Result maps of the GPR method with GPR-1 and result maps of the ground resistance image profiling method with ERT-1 (as shown below) indicate the same suspected leakage area]�
The test site didn’t have any impact on the premises, or cause any damage to the site environment (as shown below).-
Case 2: Geophysical Instrument for farmland heavy metal pollution in Baiyin
Objective: Identify the site distribution and depth of the heavy metal pollution
Technical methods: inductive electromagnetic method, ERT resistivity, and XRF fluoroanalyzer
Analysis and interpretation of survey results:
Inductive electromagnetic method: According to the survey results, in the result map, the red scale suggests high conductivity (low resistivity) and the blue-violet scale suggests low conductivity (high resistivity). It is assessed that the landfill in this area has been mixed with much leachate, resulting in a relatively high conductivity, and that the highly conductive area is associated with a large gathering of landfill leachate and may have formed underground channels for the landfill leachate. It is inferred from the analysis that the groundwater in the southwestern part of the site and the surrounding farmland may have been affected by the pollution of landfill leachate.
According to the result maps of the ERT resistivity method, it is speculated that the overall shallow strata is of low resistivity. At the same time, after analyzing the 3D distribution of low resistivity below 50 Ohm-m-80 Ohm-m, the results basically coincide with those of the inductive electromagnetic method, i.e., the heavy metal contaminated soils, large-scaled and deep, are mainly distributed in the west of the site. The 3D results show that the resistance is featured by downward extension; the average depth is analyzed as 1.2 to 1.8m and some low resistance even reaches 2.2 to 2.5m in depth. It is estimated that the heavy metal pollution in the west of the site reaches a deep degree of depth.