ARCHIVED REPORTS_SITE CHARACTERIZATION REPORT 1999

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' 7hudwelER0110 hydrocarbon odor from approximately 2 to 10 feet bgs. A sheen was observed on soil from 6 feet bgs at 2ATP-5, located in the western portion of the former L&M Petroleum facility. As noted above, soil from this test pit was significantly impacted by TPH as diesel and gasoline. The Hazard Index (HI) exceeds 1 for construction and landscape maintenance workers, commercial/industrial workers, and residents. This result was driven by the 2-methyl ' naphthalene concentration of 14,000 ug/kg detected at well 2AMW-13 at 30 feet bgs. Given that the only other detection of this compound was at test pit 2ATP-4 at 6 feet bgs, and that 8 other ' sample analyses did not detect this compound, it is likely that the PEA has overestimated the actual risk. Calculated excess cancer risks for construction and landscape maintenance workers, and ' commercial/industrial workers were within the acceptable risk range of 1 E-04 to 1E-06. Calculated excess cancer risks were higher than 1E-04 for residents, primarily due to the ' presence of benzene in soil. Soil lead concentrations do not appear to constitute a hazard. ' Area 2B —Former Seaside Oil Facility No petroleum fuel hydrocarbons or volatile organic compounds were detected in soil sampled at Area 2B. Several semivolatile organic compounds (SVOCs)were detected in one soil sample from boring 2BB-1 at 1 foot bgs, including benzo (a)pyrene at 1,020 ug/kg. No significant metals were detected in soil. Groundwater sampled from well 2BMW-1 did not contain any detectable concentrations of TPH as gasoline, diesel, or motor oil. Toluene, ethylbenzene, and total xylenes were detected at less than 0.01 mg/1. No significant metal concentrations were detected in the one sample analyzed (2BB-3). ' No debris or petroleum hydrocarbon contamination was encountered in the three test borings, one test pit, or one well installed at Area 2B. ■ 15 25970119.DGD 13 December 1999