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Table 4 Monitoring Program Action Levels <br /> PARAMETER LOCATION AND INTERVAL RESPONSE LEVEL RESPONSE <br /> Chromium Determined from investigation 0.25 mg/m3 Perform work activities in <br /> modified Level D PPE unless <br /> monitoring requires respiratory <br /> protection. <br /> Lead Determined from investigation 0.025 mg/m3 Perform work activities in <br /> modified Level D PPE unless <br /> monitoring requires respiratory <br /> protection. <br /> Zinc Determined from investigation Perform work activities in <br /> modified Level D PPE unless <br /> monitoring requires respiratory <br /> protection. <br /> pH Determined from investigation <6.0 or>8.0 Perform work activities in <br /> modified Level D PPE. <br /> Page 44 <br />