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7h.N3dweII&Rollo <br /> 1 Hazard indexes for outdoor construction and landscape maintenance workers, and commercial <br /> workers were less than one, but exceeded one for residents. This was due to the arsenic <br /> concentrations, which ranged from 3.3 to 12 mg/kg. Excess cancer risks were within acceptable <br /> ranges for construction/landscape maintenance workers and commercial/industrial workers, but <br /> exceed 1.0E-6 for residents. Based on the maximum soil lead concentration (710 mg/kg) at Area <br /> 3A, there is a potential health concern as this value exceeds target blood lead concentration for <br /> child residents. <br /> ' Area 4 <br /> TPH as diesel was detected in one of ten soil samples collected from the three test pits excavated, <br /> at 280 mg/kg. TPH as gasoline was detected at boring 4B-1 at 430 mg/kg at 6 feet bgs. No <br /> ' BTEX compounds or other volatile organic compounds were detected in soil. Several,semi- <br /> volatile organic compounds were detected in one of seven soil samples analyzed. These <br /> ' compounds included benzo (a)pyrene at 630 ug/kg and chrysene at 712 ug/kg. Lead <br /> concentrations exceeded 130 mg/kg in three of thirteen soil samples analyzed, with a maximum <br /> total lead concentration of 360 mg/kg found at 1 foot bgs at test pit 4TP-3. A TCLP analysis was <br /> run on this sample, with no soluble lead detected greater than 1 mg/1. <br /> No volatile organic compounds or significant metal concentrations were detected in the <br /> Lgroundwater sample collected from test boring 4B-1. <br /> Noncarcinogenic HIs were less than one for residents and construction/landscape maintenance <br /> workers. Excess cancer risks were acceptable for construction and landscape maintenance <br /> 1 workers, but exceeded the acceptable level for residents. The elevated risk is due to the localized <br /> presence of semi-volatile organic compounds found in soil from one sample at test pit 4TP-3, <br /> located in the northwest corner of the site. The limited occurrence of the semi-volatile organics <br /> may indicate that risk has been overestimated. <br /> 17 <br /> 25970119.DGD 13 December 1999 <br />