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' Table 1 <br /> . 11azard Exposure Guideline <br /> Substances Ca 1 031 1A 1980-09 ACGIII <br /> PEL 1LV <br /> ------------------------------------------------------------------------ <br /> Denzene 10 ppm ( ['WA) 10 ppxn (TVA) <br /> 25 ppxn (EXC) 25 ppxn 181 EL) <br /> 50 ppxn (Ceiling) <br /> Toluene 100 ppm (TWA) 10f} ppxn ('IWA) <br /> 300 ppm (Ceiling) 150 ppxn (STEL) <br /> Xylene 100 ppxn (TWA) 100 ppm (IIA) <br /> 150 ppxn (S7 EL) <br /> Gasollne 300 ppm (M) 300 ppxn (TWA) <br /> 500 ppxn (S'I EL) <br /> Etheld pbr carie de 20 ppm (1 WA) .045 ppm(TWA) <br /> 30 ppm (Cieling) . 13 ppm(STEL) <br /> 50 ppm (5m1n. max peak) <br /> Tetraethyl Lead .075 mg/1n3 .075 mg/m3 <br /> i <br /> x All of the above are ccxnpounds that may be encountered during excavation. <br /> Common sense dictates when levels are such that extra protection is neces- <br /> sary. <br /> ti <br /> 5 <br />