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nnovctive <br /> onstruction <br /> olutions <br /> Table 4-3 <br /> Known Contaminants <br /> Contaminant Maximum Location Onsite / Site Action Level Monitoring Monitoring <br /> Concentration Area of Concern Instruments Protocol <br /> 3 . TPWd TBD UST 0-10 ppm Level D ® Visual ❑ Confined space <br /> 10-50 ppm Level C ® Odor ® Continuous <br /> >50 ppm contact HSP ❑ H2S Meter ❑ Intermittent <br /> ❑ 4 Gas Meter ❑x Breathing Zone <br /> ❑ Personal Air Monitor O Work Area <br /> ® PID ❑ Perimeter- Up/Down <br /> ❑ Dust Meter Wind <br /> ❑ N/A ❑ N/A <br /> N/A= Not Applicable TBD = To Be Determined <br /> ii <br /> i <br /> i <br /> 42 <br />