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r <br /> 4.0 HAZARDOUS SUBSTANCES KNOWN OR SUSPECTED AT SITE <br /> r <br /> Chenucal Media Max mum Concentration Primary Hazard <br /> ' Detected <br /> Benzene Soil 8.4 mglkg Breathing zone <br /> GW 2.1 mg/l ' <br /> Toluene Soil 88 mg/kg Breathing zone. <br /> GW r 19 mg/l <br /> Ethylbenzene Soil 31 mg/kg Breathmg zone <br /> GW 29 mg/l ' <br /> Xylenes Soil 190 mg/kg Breathing zone <br /> GW 150 mg/1 <br /> TPHg Soil 2,100 mg/kg Breathing zone. , <br /> GW 1,600 mg/l <br /> Total Lead Soil 12 mg/kg Ingestion <br /> GW ND m /l , <br /> 5.0 PHYSICAL HAZARDS ' <br /> 5.1 POTENTIAL SAFETY HAZARDS AT SITE <br /> o Velucular traffc_on-nearby-roadways ' <br /> _ Q Holes or uneven surfaces <br /> o High power overhead power lines <br /> o Possible heat stress in summer <br /> o Heavy equipment including backhoe and trucks <br /> o Unsupported excavations <br /> 1 <br /> 5.2 UNDERGROUND UTILITY HAZARDS <br /> Underground utilities shall be identified by contacting USA and by the Client prior to initiating any <br /> i <br /> subsurface investigation or work <br /> r <br /> 3 ' <br /> 1' <br />