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very dependent on the availability of data and specifics regarding the site; therefore, based on the phase of the project (i.e. , initial site assessment) it may not be possible to include this information. This should not be confused with the environmental risk assessment that may be required for site mitigation projects (as part of the RI/FS) ; the assessment for the SSP v ill address hazards incurred by the activities at the site (i.e. , vapors fru, exposed faces, particulates generated by drilling and excavation, safety issues, etc.) . 5. Exposure Monitoring Plan [PR (b) (1) (iv) (a) (6) and (h) This section provides the plan for all aspects of the area, worker and c=unity exposure monitoring programs. Describe rationales and methodologies for each program, and locations for area and community monitoring. Equipment calibration protocols should be included as a appendix to the SSP. Exposure hazards to consider include airborne vapors, gases and particulates, radiation, heat stress, and noise. Direct Reading Instruments Vapors and gases are typically initially monitored with direct-reading instruments (MI's) such as portable flame ionization detectors (i.e. , Foxboro organic Vapor Analyzer or OVA) , portable photoicnization detectors (i.e. , HNu, Photovac TIP,etc.) and various cambustible gas indicators. Such measurements may be used for the preliminary determination of appropriate levels of personal protective equipment, but readings must be quantified by personal monitoring using NIOSH methods. Personal Monitoring Both the IFR and PR require personal monitoring of those employees likely to have the highest exposures. TSCD interprets this as requiring personal sample collection devices such as pumps and sampling media, or passive dosimeters, with the media quantitatively analyzed for the contaminants of concern by an AlHh-certified laboratory. The personal saling should be performed in accordance with NIOSH methods, if um Possible. Summaries of the methods used should be included in the monitoring plan. Note that this sampling is performed in addition to DRI monitoring. Colorimetric Tubes The a=rooriateness of the use of colorimetric tubes is open to debate, and is at best subject to site- and situation-specific activities. If the contaminants of concern are known, then the use of a colorimetric turn to determine exposure potential may be helpful. Due to the cross_-sensi tivi ties and other sources of error found in most tubes, follow-up personal sa=ling using NIOSH methods is re^,..camiended. Du-: MonitorLn Many SSP's indicate concern over the presence of 'oF-7 ticulates only if visible dust is generated. '';his "visible dust" action criteria, which is found in many SSP's, is not valid in most cases. There is typically no means by which to estimate the concen -ation of dust (and the - 8 -