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<br />Soil Investigations for Data Collection in the Delta <br />Initial Study/Proposed Mitigated Negative Declaration 15 <br /> <br />*Source: Chkirbene et al. 2014 <br />Figure 7. Time Domain Electromagnetic (TDEM) System Schematic <br /> <br />Cesium Vaper Total Field Magnetometer (CVTFM) <br />For the CVTFM method, a magnetometer and GPS positioning unit are hand-carried by <br />a technician to measure the ambient magnetic field (Figure 8). The technician walks a <br />line collecting readings. This process is repeated for the next line spaced approximately <br />10 feet to 15 feet away from the first. The total survey area at a given location is <br />approximately 500 feet by 500 feet.