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Austin Road Landfill Health&Safety Plan Austin Road Landfill,Stockton,California Page 7 oxygen sensor to conduct air monitoring during drilling activities. Background levels must be established well upwind of the drilling locations. Prior to initiation of drilling, all utilities will be clearly staked by utility representatives. During drilling, workers will be aware of the location of overhead lines as well as any changes in drilling that might indicate the presence of a buried utility line. If it is believed that a utility line has been drilled into,drilling should immediately cease and the Project Health and Safety Officer will be notified. The following paragraphs describe air monitoring for combustible gases. Action level information is summarized in Table 3.1. Table 3.1 Air monitoring action levels Instrument Parameter Action level S 'is Resp2nse Above background in breathing zone for more than 5 minutes OR>5 ppm in Ventilate and increase breathing zone(other than a monitoring Photoionization Volatile Organic peak)OR>10 but<100 ppm Detector(PID) Compounds peak. (VOCs) >10 but<100 ppm in breathing zone for more than 5 minutes Temporarily cease OR>25 ppm in breathing zone operations (other than a peak)OR>50 but<100 ppm peak <19.5% in breathing zone at Ventilate and increase Combustible Oxygen o valleymonitoring Gas Indicator <19.5%in breathing zone Temporarily cease other than a valley operations 10%LEL in breathing zone Increased monitoring Combustible 25%LEL at depth gas indicator Methane gas 25%LEL 1 foot above hole or (CGI) casing,or 25%LEL in work Temporarily cease zone operations If the exact nature of the volatile contaminant(s) is unknown, any consistent readings in the breathing zone that are perceptibly above the upwind background level for more than 5 minutes, any readings in the breathing zone greater than 5 ppm other than a momentary peak, or any peak reading greater than 10 ppm but less than 100 ppm shall be the action level to ventilate the area and increase the monitoring frequency. Any reading consistently greater than 10 ppm above background (but less than 100 ppm) for 5 minutes, greater than 25 ppm other than for a brief peak, or any peak reading greater than 50 ppm but less than 100 ppm in the breathing zone will be the action level for temporarily ceasing operations. Any readings of oxygen concentration less than 19.5% during momentary valley shall be the action level to ventilate the area and increase the monitoring frequency. Readings of less than 19.5%oxygen for any duration longer than a momentary valley will be the action level for temporarily ceasing operations. Methane gas generated by the decomposition of organic matter is commonly associated with invasive work on and near sanitary landfills. Combustible gas monitoring will be performed when drilling all boreholes.