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Site Safety and Health Plan <br /> Petroleum Hydrocarbon Contamination <br /> Terracon Project#67047008 k <br /> Page 4 <br /> minutes to concentrations as high as 1054 ppm, or for 8 hours to concentrations around <br /> 150-270 <br /> i <br /> i <br /> I <br /> i <br /> 1 <br /> I <br /> i <br /> h j( <br /> 4 <br /> I <br /> kFF <br /> f <br /> i <br /> i <br /> t <br /> I <br /> 4 <br /> i <br />