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• SECTION 3 TASK RISK ANALYSIS As previously described, there are a variety of hazards encountered during UST activities, but not all are necessarily present on any given project. The following discussion identifies the predictable and characteristic hazards associated with individual tasks, and-comments on the likelihood of exposure from each. Each task discussed below shall be the means of the section number for references in the task in Section 4.1.2. 3.1 UST REMOVAL AND REMEDIAL ACTMUIES The potential exposure to a physicochemical incident during the removal of USTs should be considered significant, although this assessment varies slightly with tank condition, contents, and ambient influences. In most cases involving petroleum storage tanks, the USTs initial internal atmosphere is too vapor-rich to support combustion. However, before the tank(s) can be removed that atmosphere must be brought down through the flammable range to a condition which is too lean to support combustion. The merting/purging process and the resultant displacement of vapors is the primary physicochemical concern. However, risk associated with the process will be minimized when tank inerting/purging and site control procedures follow the SEACOR UST protocols. Petroleum vapors liberated during tank inerting or purging present the most significant chemical hazard Site personnel must move to a position upwind of the vapor source and perform continuous monitoring for the presence of volatile organic compounds (VOC) in the breathing zone. The protocol for personal protection described in Section 4 of this plan must be implemented if VOC are detected in the breathing zone at or above the prescribed action levels. Further chemical inhalation exposure is possible during the remediation of contaminated soils and/or the purging of associated product piping. Chemical exposure is possible through dermal contact during contaminated soil sampling activities, therefore, suitable hand protection is required. The referenced personal protection plan must be implemented during all of these activities. Any of the hazards discussed in Section 2 may be present during UST removal. The likelihood of injury from such sources is possible However, pre-planning and awareness will minimize these risks 3.2 SITE CHARACTERIZATIONS The likelihood of physicochemical incident during site characterization activities is relatively low. However, a very real potential exists for contact with underground and overhead utilities, and can result in severe physical injury Of additional concern is injury from the physical hazards related to drilling. Such hazards range from simple pinch and impact injuries to significant trauma incidents Regular drill rig inspections, utility locates, caution and awareness during drill operation, and proper oversight can limit these occurrences The SE'ACOR Drilling Safety Guide (SSP 30) provides the procedures for safety related to drilling operations Rev 4/93 3. 1 corp-h&slblankust h&s