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<br />39 <br /> <br />4.3 CONTAMINANT HAZARD SUMMARY <br /> <br />Contaminants of concern (COCs) have been established for the site and are based on the Site Characterization data provided in <br />the contract documents. Known contaminants are listed on Table 4-3 <br /> <br />Table 4-3 <br />Known Contaminants <br />Contaminant Maximum <br />Concentration <br /> <br />Location Onsite / <br />Area of Concern <br />Site Action Level <br /> <br />Monitoring <br />Instruments <br />Monitoring <br />Protocol <br />1. TPH-g N/A N/A 0-10 ppm Level D <br />10-50 ppm Level C <br />>50 ppm contact HSO <br />☐ Visual <br />☐ Odor <br />☐ H2S Meter <br />☐ 4 Gas Meter <br />☐ Personal Air Monitor <br />☒ PID <br />☐ Silica Monitor (SKC) <br />☐ N/A <br /> <br />☐ Confined Space <br />☒ Continuous <br />☐ Intermittent <br />☐ Breathing Zone <br />☒ Work Area <br />☐ Perimeter- Up/Down <br /> Wind <br />☐ N/A <br /> <br />2. TPH-d N/A N/A 0-10 ppm Level D <br />10-50 ppm Level C <br />>50 ppm contact HSO <br />☐ Visual <br />☐ Odor <br />☐ H2S Meter <br />☐ 4 Gas Meter <br />☐ Personal Air Monitor <br />☒ PID <br />☐ Silica Monitor (SKC) <br />☐ N/A <br /> <br />☐ Confined Space <br />☒ Continuous <br />☐ Intermittent <br />☐ Breathing Zone <br />☒ Work Area <br />☐ Perimeter- Up/Down <br /> Wind <br />☐ N/A <br />