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• Work zones established each day - list location and activity for each. <br /> • Breathing zone and borehole readings. <br /> - type of instrument/reading <br /> - location <br /> - time of measurement <br /> - activity <br /> - actions taken in response to elevated levels <br /> • Any unusual occurrences (injuries, incidents of non-compliance with HASP, <br /> instrument alarms sounding, etc.) or safety concerns. <br /> • Upgrades/downgrades in PPE. The duration of use of Level C equipment shall <br /> be noted. <br /> • Weather conditions each day (temperature, wind and precipitation) are <br /> sufficient. <br /> 10.0 CHEMICALS OF CONCERN <br /> Health Effects <br /> Potential health effects from a chemical exposure are dependent on several exposure factors <br /> such as: toxicity of substances, duration of exposure, concentration during exposure and the <br /> overall health of the person exposed. <br /> The chemicals commonly at this site are: gasoline, Benzene, Toluene, Ethylbenzene and <br /> Xylene. The following is a health analysis of these chemicals. <br /> Additional information (When Available) of these chemicals can be found in the Material <br /> Safety Data Sheet located in Appendix D. <br /> Gasoline constituents can be divided into five major groups: alkanes, alkenes, cycloalkanes, <br /> aromatics and additives. The aromatics are the constituents generally regarded to be of <br /> greatest toxic concern. The major aromatics in gasoline are benzene, toluene, ethylbenzene <br /> and xylene. Of these, benzene is considered to be the most toxic. One characteristic effect <br /> of gasoline and its saromatic constituents is their ability to irritate the skin when repeated or <br /> prolonged exposure occurs. <br /> Benzene <br /> Benzene can enter the body through inhalation, ingestion and skin contact. Studies have <br /> noted that chronic exposure to benzene vapor can produce neurotoxic and hematopoietic <br /> (blood system) effects. Other effects can include headache, dizziness, nausea, convulsions, <br /> coma and possible death if exposure is not reversed. One significant effect from chronic <br /> CRC Environmental Risk Management,Inc. Project No.2100-217-2 <br /> American Savings Bank 150 West 10th Street <br /> February 15, 1995 21 Tracy,California <br />