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Macro-Core Soil - ! <br /> Sampler Closed Piston Operation <br /> . Closed Piston System Sampling (continued) <br /> G If using the smaller Geoprobe machines, use the FOOT <br /> control to slowly apply down pressure When the toot <br /> reaches the ground surface, continue the sampling <br /> m process <br /> a <br /> 1` <br /> ao 7 Use the PROBE control to apply do„n pressure as in <br /> normal operation and activate the hammer as necessary <br /> to begin sampling (Figure 1) <br /> 8 Add a probe rod it necessary, and dm e the sampler to Figure 1 Driving sampler <br /> below ground surface <br /> the top of the desired sampling depth (Figure 2) <br /> IMPORTANT Some soil conditions nnav Ntiarrant usms; a <br /> solid drive point to pre probe the hole to the desired <br /> sampling depth Intormation about the subtiurface tincl clepih <br /> to bedrock should be known betore drn rig the simpler <br /> Damage May occur it the sampler is cJn�en into iock or other <br /> impenetrable layer <br /> NOTE The MC Closed Piston Sampler is not designed to be <br /> driven from the surface through undisturbed soils The MC <br /> closed piston sampler is designed to be used as a continuoc+s <br /> sampler vtiith the locking piston serving to seal the sampler <br /> as it passes down through collapsed material in the <br /> previously cored hole <br /> i <br /> fcS <br /> Previously cored hole <br /> 5\ <br /> Figure 2 The closed Macro-Core <br /> Sampler is driven to the top of the / <br /> desired sampling depth i <br /> Geoprobe Systems <br /> �Q�a�q O�� d���]Qo t2<�q�°'4 �7 O o a p,°dD ��� `�'p°� `� O�o"� � f� ,4 ar p Q � C�� °•°.gyp p °`O•,,b <br /> B.8 <br />