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Xylene Compounds These materials are clear liquids with a flash point of 100 degrees Fahrenheit. The TLV is currently established at 100 ppm in air. Xylene compounds are currently under study as possible carcinogens. It is not anticipated that the potential levels of exposure will reach personal exposure limit (PEL) or threshold limit value (TLV) limits, but this is based solely on limited available specific information. It is expected that inhalation and dermal contact will be the potential exposure pathways of concern. Should respiratory irritation occur, appropriate air-purifying respiratory protective devices will be worn, with organic vapor cartridges and dust pre-filters, or with high efficiency organic vapor/IEPA stack-type cartridge. Typically, the cartridge will require replacement daily. B. Confined Space Entry A confined space entry program will be implemented in the event that entry into the trench is required to collect soil samples. PACIFIC's confined space entry program is included as Appendix A. C. Trench Shoring In the event that entry into a trench deeper than 5 feet is required, the trench shall be equipped with a protective system (shoring or other means) that shall have the capacity to resist without failure all loads that are intended or could reasonably be expected to be applied or transmitted to the system. The protective system must meet the requirements presented in the California Code of Regulations, Title 8, Article 6 (excavations), Section 1541 (general requirements). D. Physical Hazards Existing utilities on the site must be avoided in the process of normal site work. Overhead power lines which may be located throughout the site present a potential for electrical contact. All overhead lines located in the work area will be noted prior to starting work. A minimum 3100971B/SSP2.DOC 4 April 12, 1996