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<br />Soil Investigations for Data Collection in the Delta <br />Initial Study/Proposed Mitigated Negative Declaration 19 <br /> <br />*Source: Liebherr 2019 <br />Figure 11. Barge-mounted Rotary Drill Rig <br />2.2.1 Over-Water Soil Boring Investigations Methods <br />Several days to several weeks prior to investigations, vehicles at or near each Impact <br />Area will include support vehicles or a boat for DWR and DCA engineers, geologists, <br />environmental scientists, and the cultural resource team for a reconnaissance level site <br />visit. In addition, a hazard survey will be performed by a small boat towing bathymetric <br />and geophysical instruments to confirm mudline depths and confirm that there are no