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> OP <br /> (Cassidy onannon) is responsible for evaluating and defining corrective actions if <br /> ..............................................I.....................................sample results indicate contaminant levels in excess of <br /> established limits. <br /> �n11 U <br /> Surface Hazardous Collection Monitoring Permissible Required <br /> Location Substance Method Frequency Surface Response <br /> Concentration <br /> (location-specific) <br /> Each Methane Air Extraction Periodically 10% LEL Terminate <br /> Excavation During Excavation <br /> Excavation <br /> Each Ionizing Air Extraction Periodically <2mrem/hr Terminate <br /> Excavation Radiation During Excavation <br /> Excavation <br /> Permissible Surface Concentrations listed in Table 7-2 were determined by <br /> gU fti*were derivedf=rorri"ffie 06 c­ i c7,"Safefy ccc, itea)tfi...................................... <br /> uidance Manual for Hazardous Waste Site Activities). <br /> ........................................................................................................................................................................................................................................................................... <br /> 7.3 Noise Monitoring <br /> PPE for hearing protection will be provided. Decibil levels are not expected to exceed <br /> 85dB <br /> Chapter 7 - 7 <br />