ARCHIVED REPORTS_XR0005975 - Laserfiche WebLink

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lieu of PPE upgrade, site personnel may evacuate to a position upwind where organic vapor concentrations return to that of background Modified Level C -- Sustained organic vapor concentrations in the Breathing Zone greater than 50 units above recorded background readings At this point, Benzene-specific monitoring shall already have been initiated, and the conditions of Modified Level C shall be subject to these action levels as well. Modified Level C shall employ the use of a half-face APR instead of a full-face model (full Level C), while all other level C PPE requirements are employed. VOC concentrations greater than 75 units will require upgrade to full Level C protection. This plan does NOT cover UST operations requiring Level B protection. Level C - Organic vapor concentrations in the Breathing Zone greater than 75 units but less than 500 units above recorded background readings Benzene-specific monitoring shall already have been initiated Level C shall employ the use of a full-face APR as well as the other specifted PPE VOC concentrations greater than 500 units will require evacuation of the site This plan does NOT cover UST operations requiring Level B protection 4.3.3 Air Monitoring Instrumentation The following instruments shall be used on site to ensure personal protection against the forementioned hazards. Table_2 presents important information regarding the response factors of the organic vapor monitoring instruments All air monitoring equipment will be calibrated-daily-prior--to-use-on site (and ideally, once-more-during the course of the work day). All instrument calibration records will be made on the pages supplied in Section 8 and maintained as part of this document • Organic vapor detectors (PID / FID) On standard UST sites, either photoionization or flame ionization detectors will be used to perform real-time evaluations of airborne concentrations of VOC If a PID monitor (eg Hnu or OVM) is selected, it should be accompanted by a 10 0 eV (OVM) or 10 2 eV (Hnu) detector module. As shown by Table 2, the Foxboro OVA 128 is suitable for use with all the expected chemical compounds Monitoring with organic vapor detectors will be conducted continuously while in the vicinity of site operations, with periodic monitoring in the breathing zone(s) of site personnel Response to detected VOC concentrations will follow the stated Action Levels • Combustible Gas Indicator/Oxygen Meter(CGI/02). This instrument will be required only when SEACOR personnel are responsible for ensuring that combustible atmospheres do not prevail to tanks during removal or at other locations on site In the event that SCACOR must make the determination that USTs are in a non-combustible state prior to their-removal, the SHSO shall follow the established protocols for propet ly inei ting/purging the tanks Action Levels established for safe removal of USTs (or non-combustible conditions around the site) are less than 20% Rev 4/93 4-5 corp-h&sWankust h&s