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194 <br /> i = <br /> contaminants are encountered or a different work <br /> activity )egins. Specific: monitoring locations and <br /> frequencies are given below. <br /> Carefully inspect each piece of monitoring equipment <br /> prior to work startup. Failure of any of the <br /> equipment listed below to work properly must be <br /> reported to the Project Manager immediately. <br /> 1. Explosimeter/0 meter: Calibrate prior to and <br /> after each Ly's activities according to <br /> manufacturer's instructions; and record <br /> calibration activity in the field notebook. <br /> Monitoring frequency is to be continuous during <br /> actual drilling. Monitoring locations should be <br /> the borehole and the breathing zone. Record <br /> instrument readings every 30 minutes during <br /> drilling activity. Recharge at the end of each 1 <br /> day. <br /> -: Action Levels: <br /> Explosive Atmosphere (measured at source, i.e. , <br /> i <br /> borehole, test pit, etc.) <br /> A: g10% LEL* Continue activity <br /> 10%-20% LEL Continue activity. <br /> 2-201 LEL Evacuate _ . . <br /> *LEL: Lower Explosive Limit <br /> Oxygen (measured in breathing zone) <br /> <19.5% Level A required <br /> 19.5% to 23% Monitor <br /> r- <br /> >-23$ Evacuate <br /> �= 2. HNu (check contaminants and select the <br /> appropriate lamp) : Calibrate prior to and after <br /> each day's activities, according to <br /> manufacturer's instructions. Record calibration <br /> in the SSC log book. Recalibrate after cleaning <br /> :.4 the lamp or when background levels drift. This <br /> instrument is sensitive to humidity and may <br /> require periodic lamp cleaning if it is humid. <br /> Monitor every half hour in the breathing zone <br /> E ' and record measured levels in the log books. <br /> 3F031604\WP\005.51 A-7 <br />