Laserfiche WebLink
GEMIMATRIX <br /> 4.2 SOIL RESULTS <br /> A total of 59 soil samples were collected from 10 soil/well borings and were analyzed for <br /> TPHd, TPHmo, TPHg, BTEX, PAHs, and MtBE (MtBE analyzed in 34 samples only). Soil <br /> data indicate that significant amounts of residual petroleum is generally found in a relatively <br /> small area centered around SB-2, SB-8, and MW-1 (Figure 5). No benzene or MtBE was <br /> detected in any of the soil samples. Soil samples collected from boring locations MVV-2, MW- <br /> 3, MW-4, SB3, SB4, SBS, SB6, and SB7 did not contain detectable concentrations of benzene, <br /> ethylbenzene, or PAHs; only low concentrations of toluene (one sample at 0.0037 mg,'kg) and <br /> xylenes (two samples; 0.0087 and 0.009 mg/kg)were detected. Samples from these borings <br /> contained low concentrations (less than 200 mg/kg) of TPHd, TPHmo, and TPHg; as <br /> previously discussed, these TPH ranges are subsets of the overall TPHc range. <br /> In general, the lateral extent of residual petroleum is was constrained within the area of SB- <br /> 8/MW-1, and the vertical distribution occurs between depths of 15 and 50 feet bgs (above and <br /> below the water table)(Figure 6). Borings SB-8 and MW-1 contained detectable <br /> concentrations of TPH and discrete constituents within the following ranges: <br /> ■ TPHd from 480 to 9800 mg/kg <br /> ■ TPHmo from 490 to 9400 mg/kg <br /> ■ TPHg from 43 to 270 mg/kg <br /> ■ Ethylbenzene from 0.6 to 2.2 mg/kg <br /> ■ Toluene from 0.44 to 4.9 mg/kg <br /> ■ Xylenes from 0.6 to 8.4 mg/kg <br /> • Various PAHs from 340 (chyrsene) to 5800 mg/kg(fluorene) <br /> Soil analytical results summarized in Tables 3 and 4. <br /> 4.3 GROUNDWATER RESULTS <br /> Groundwater samples collected by Radian on 28 July 1998 from wells MW-2,MW-3, and <br /> MW-4 did not contain BTEX,MtBE, TPHg, TPHmo, or PAHs. Samples collected by Radian <br /> reportedly contained TPHd at concentrations of 230(MW-2), 53 (MW-3), and 150 (MW-4) <br /> micrograms per liter(gg/l); these samples were not cleaned up with silica gel prior to analysis. <br /> Samples collected by Geomatrix on November 5, 1998 were analyzed for TPHd after being <br /> I1sf3ldeptdatalDoc_safe%5000s1501 I LSI HRA Rp[.doc 8 <br />