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n <br />AUG -30-1996 15:04 <br />IM <br />- ilij.�i <br />WILKEY'S ENGINEERING <br />11 <br />The potential hazards to personnel working the subject site have been identified <br />as chemical contamination, potential for fire and explosion, and the physical hazards of <br />working around heavy equipment and working near an open excavation. <br />M: 1 i 0 1 i • t <br />P.12 <br />The chemical contaminants of concern for this project are gasoline constituents, <br />primarily benzene, ethylbenzene, toluene and xylene. The hazards associated with the <br />chemicals are a potential for fire and explosion, potential worker exposure due to direct <br />contact with and/or inhalation of vapors of the gasoline constituents. <br />Gasoline vapors (50 - 100 octane) are moderately to highly toxic via inhalation, <br />which can cause central nervous system depressions, pneumonities, fatal pulmonary <br />edema and some addiction if exposures OT he vapors are greater than 300 parts per <br />million (ppm). Gasoline and oil constituents also pose fire and explosion hazards when <br />present in sufficient concentrations and with a source of ignition. The flammable range <br />for gasoline vapors is 1.3 - 6.0 percent by volume in air. During the excavation, gasoline <br />vapors may potentially accumulate in a confined space due the vapors being heavier than <br />air. Chemical contamination from gasoline and oil constituents may be present during <br />the replacement of the lines and will be controlled as follows: <br />Hazard <br />Control <br />Contamination <br />Monitor with an LEL meter, detect by smell <br />and sight. Limit or avoid contact,use <br />protective equipment as described and, if <br />necessary, follow with decontamination <br />measures, as described further in this SSI -1P. <br />Fire & Explosion <br />Remove as much product from the lines as <br />possible. <br />Keep two 20BC fire extinguishers within <br />twenty five feet of the work. <br />Restrict smoking by anyone in the area, <br />Restrict any source of ignition within twenty <br />feet of the pipe. <br />Construction Site <br />Restricted area -barricades and restricted <br />access will be maintained to prevent <br />unauthorized traffic in the area. <br />2. <br />