work plan for soil remediation, sampling and analysis plan, site ...

. . . --..7.0 AIR MONITORINGAir monitoring will be conducted in order to determine airborne contamination levels. Thisensures that respiratory protection is adequate to protect personnel against the chemicals thatare encountered. The following air monitoring efforts will be used at this site. Additional airmonitoring may be conducted at the discretion of the SSO.The followingchart describes the air monitoring required and appropriate action levels.MonitoringDeviceLEL& (work area)To be performed during soilexcavation and direct loadoutoperationsActionLevel>lO% LEL500 ppm for 5 min.Level C, monitor with benzenedragertubesStop operations and allow vapors todissipate to less than 500 ppmbefore continuingBenzene Dmger Tubes >0.5 ppm Upgrade to Level CWhen PID readings are >lO ppm in >25 ppm Stop operations and allow vapors toBreathing Zonedissipate prior to continuingMini-Ram (Breathing Zone) >2.5 mg/m3 for 5 min. Level CI’o be performed during soil >5.0 mg/m3 for 5 min Stop operations and institute dustexcavation and direct loadoutcontml measuresoperations7.1 LOWER EXPLOSIVE LIMIT/OXYGEN (LEL/02) METERPrior to entering a confined-space area or performing hot work involving welding, cutting, orother high heat-producing operations where flammable or combustible vapors may be present,LEL/O2 measurements will be taken.7.2 PHOTOIONIZATION DETECTOR (PID)A PID will be used to monitor total ionizable organic content of the ambient air. A PID willprove useful as a direct reading instrument to aid in determining if respiratory protection needsto be upgraded and to define the EZ. Although organic compounds are not anticipated to beOHM Project 16487SSHSP Health and Srfay Plan July 1995Information herein is proprietary and confidential and to be used ot rdeased to othen only with explicit wriy permission of OHM Rantdiationselvices Corp.7-l