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ka IV. HAZARD EVALUATION '. r A. Ove all a rd eve : The overall hoard level is moderate, based on the previous investigation be ~ and remediation. The hazard potential may increased by still winds and high temperatures. f_ B. C em calHa s: Gasoline is a mixture of paraffins, aromatics, and Gaefins. Benzene, a known human carcinogen is t1le major constituent of concern in gasoline. The principal constituents of concern stemming from the Disco gasoline underground tanks are benzene, toluene, lens, and lead. The Cal/OSHA 8-hour PELs xY flene, and tetrathyl lead or benzene, toluene, xy are: m excursion ion' limit, • Benzene: 10 ppm, 25 PP excursion duration 10 min/8hrs, ceiling . limit of 50 ppm °� • Toluene* 100 ppm, 200 ppm excursion limit, excursion duration 10 min/8hrs, 500 ppm ceiling limit Xylenes: 100 ppm+ 200 Fem> excursion limit., •� excursion duration 30 min/shrs, 300 ppm ; .tom ceiling limit fp Tetraethyl Lead: 0.1 mg/m� Listed substances have a potential to enter the body through simple skin contact. This overall risk is by the cutaneous branes route including mucoore particularly,l t.„ try, either by airborne or, eye en by direct contact with the substance. The rate of + absorption is ation to a function of ropriate mhe a sures for which the skin is exposed. Appropriate the prevention of cutaneoUS absorption must be Followed. �= Exposures to concentrations above the "excursion limit", but not to exceed the "ceiling limit , are t to exceed the permitted for a time period no "excursion duration". Tables ASummarize the -2 and ��ical characteristics chemical, and phy � . constituents. 4 � SF031fiO4\WP\005.51 A-3 .. F i s 1