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- <br /> f <br /> 4 <br /> J <br /> 4.0 HAZARDOUS SUBSTANCES KNOWN OR SUSPECTED AT SITE <br /> chemical Media Maximum Concentration Primary Hazard <br /> Detected <br /> Benzene soil 8.4 mg/kg Breathing zone. <br /> GW 2.1 mg/1 <br /> Toluene Soil 88 mg/kg Breathing zone. <br /> GW 19 mg/l <br /> Ethylbenzene Soil 31 mg/kg Breathing zone. <br /> GW 29 mg/l <br /> Xylenes Soil 190 mg/kg Breathing zone. J <br /> GW 150 mg/1 <br /> TPHg Soil 2,100 mg/kg Breathing zone. <br /> i <br /> k I' GW 1,600 mg/l <br /> Total Lead Soil 12 mg/kg Ingestion. <br /> ow ND mg/l . <br /> 1 <br /> 5.0 PHYSICAL HAZARDS <br /> 5.1 POTENTIAL SAFETY HAZARDS AT SITE <br /> O Vehicular traffic on nearby roadways. <br /> 1 o -u Holes or uneven surfaces. r I <br /> � I <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 /> 5.2 UNDERGROUND UTILITY HA.ZAR:- J , <br /> i' <br /> - I <br /> Underground utilities shall be identifiee by cc-ntacting USA and by the Client prior to initiating any <br /> I <br /> subsurface investigation or work. <br /> i. <br /> 3 <br /> I <br />