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Probe i t tions When To Monitor <br /> 1. Probes should not be plugged. When barometric pressure is lowest.This may <br /> 2. Obtain maps and as built drawings for be late morning or early afternoon. <br /> probes. (Should be located in LFG monitor- Note: Gas will move from areas of higher pres- <br /> ing plan.) Determine depth and number of sure to areas of lower pressure. <br /> perimeter probes.lf probes are installed, <br /> check with operator if any special fittings <br /> will be needed. Notes <br /> 3. Check to ensure probes are not: <br /> Damaged <br /> Submersed in water <br /> Covered with dirt or mud <br /> 7 8 <br />