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Which robes Should 1 Notes <br /> Check? <br /> For all probes: <br /> • Know types of waste and depth of buried <br /> wastes as well as to the proximity of recep- <br /> tors. <br /> • Probes with a history of high readings. <br /> • Probe is close to receptors. <br /> • Probes that are close to waste, and no con- <br /> trol system is in place <br /> Note: an inspector is not obligated to bar hole <br /> punch at the boundary if an operator has cho- <br /> sen that probe as the point of compliance. <br /> Even if greater than 5 percent CH4 in air is <br /> found in a probe closer to the waste. <br /> 9 10 <br />