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s. �r .,0 <br /> TABLE 4 <br /> PRIMARY CAL/OSHA PATHWAY PRIMARY SYMPTOMS <br /> COMPOUND (1) <br /> (PPM) <br /> Ammonia 25 TWA Inhalation Irritation of eyes, nose & throat. <br /> 18 STEL (3) Ingestion <br /> Notes: <br /> (2) TWA= 8 hour time weighted average <br /> (3) STEL = Short term exposure limit- The TWA concentration which <br /> workers should not be exposed for longer than 15 minutes, and which <br /> should not be repeated more than four times per day, with at least 60 <br /> minutes between successive exposures <br /> CA95DE-034 <br /> _ American Geological Services,Inc. <br /> 4 <br />