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<br />Soil Investigations for Data Collection in the Delta <br />Initial Study/Proposed Mitigated Negative Declaration 10 <br />Figure 3. Truck-mounted Rotary Drill Rig <br /> <br />*Source: Central Mine Equipment Company 2019 <br />Figure 4. Track-mounted Rotary Drill Rig <br />2.1.1 On-Land Soil Boring Investigation Methods <br />Drilling activities will be conducted using a drill rig with auger, casing, and mud-rotary <br />capabilities. Auger techniques may be used on the upper part of the boring. Mud-rotary <br />techniques may be used to continue the boring started with the auger, or mud-rotary <br />could be used for the entire boring starting at the ground surface. Casing may be used <br />to maintain the hole stability. Auger techniques will generate an approximately 6.5 to 8- <br />inch diameter boring. Mud-rotary drilling and sampling will generate 4 to 6-inch diameter