SITE INFORMATION AND CORRESPONDENCE

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Kennedy/Jenks Consultants • Hearing protection will be worn if a preliminary noise survey or past experi- ence indicates that maximum noise levels will exceed comfortable levels at any time during site operations. Additionally, field personnel should not enter any excavations exceeding 5 feet in depth unless the excavations are properly shored, braced or sloped and a safety ladder is provided for ready access or egress. KIJ personnel will not enter any confined space, defined by OSHA as the concurrent exis- tence of the following conditions, without advanced specific preparation, planning, training, and supervision by the Regional Safety Supervisor. (1) The space is large enough and so configured that an employee can bodily enter and perform assigned work; and (2) The space has limited or restricted means for entry or exit (for example, tanks, vessels, silos, storage bins, hoppers, vaults, and pits are spaces that may have limited means of entry); and (3) The space is not designed for continuous employee occupancy. 4.2 Potential Chemical Hazards VOCs have been detected in groundwater and soil at the site. Field personnel could poten- tially be exposed to VOCs and other chemicals at the site by direct contact with soil or groundwater, through inhalation of dusts containing organic chemicals, or through inhala- tion of organic chemical vapors. Field personnel will minimize potential chemical hazards by (1) avoiding direct contact with groundwater and soil, (2) performing air monitoring to determine necessary level of personal protective equipment and (3) minimizing generation of dust. Ingestion of particulate matter containing chemicals is another general exposure route. However, for the site personnel, the potential for this type of exposure is minimal. Safe work practices, including restriction of eating, drinking, or smoking to certain times and places will be enforced at the worksite. Groundwater Samples. The maximum concentrations of VOC detected in the groundwater in monitoring wells on the site were 1.1 ppm for TPH, 0.43 ppm for Benzene, 0.0012 ppm for Toluene, 0.026 ppm for Ethylbenzene, and 0.10 ppm for Xylene. Detected concentrations of the above-named VOCs for each monitoring well are presented in Table 1. Soil Samples. Various VOCs have been detected in subsurface soil samples collected at the site. The VOCs and their highest reported concentrations are listed in Table 2. Available Threshold Limit Values (TLV) or Permissible Exposure Limits (PEL) published for the chemicals detected in soil and groundwater are listed in Table 3. g:\jobs19405491H&Sp1anlp1an 5 940549.00