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initial entry into contaminated areas. The PID will be calibrated according to manufacturers guidelines. Field calibration readings will be recorded in the Field Activity Daily Logs. Air monitoring will be performed before ground is broken to establish background levels. Air monitoring of the breathing zone at the excavation locations will be done approximately every 30 minutes. Monitoring with the PID will also be performed during each sampling phase. A sustained reading on the PID will be defined as a reading of 50 parts per million above background which continues for one minute. If airborne concentrations reach this level, conformational air sampling via Draeger® tubes will be used. If benzene concentrations reach 0.5 ppm, air purifying respirators will be required. Unless the PID indicates the presence of airborne contaminants, EPA level D protection (gloves, hard hats, work boots, and safety glasses) will be the required PPE for initial entry and general field work. PPE requirements may be modified by the project CIH based on data obtained from the job site and job requirements. Real time monitoring of particulates will not be performed for the following reasons: • Lead and dust concentrations above the TLV are not anticipated. • Lead is a cumulative poison, which at the levels of exposure and the project duration expected will not cause adverse health effects. Personnel air samples for lead will be collected from at least one site worker, once a week. A 48 hour turnaround time for the lead samples will be requested. If the threshold values for level B are exceeded, all work will be stopped and the CIH will reevaluate the work plan. The samples will be collected using SKC model PCXR3 personnel air sampling pumps with 37 mm, 0.8 micron, mixed cellulose ester, membrane filters, in polystyrene cassettes, as the collection media. The air sampling pumps will be calibrated prior to, and after sampling. The pumps shall be operated at a flow -rate of 2.0 liters per minute. Work currently outlined in this Work Plan limits employee exposure to a four-hour maximum sampling effort. Personnel air samples for benzene will be collected from one site worker. The samples will be collected using a 3MTM model 3500 organic vapor monitor. MZ/07-07-92/EES/ENG/2054 3-13