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S � <br />�. Gtofoglcal7akntcsfxC Page 3 <br /> Revised Site Conceptual Model Report <br /> I Project No.507.2 <br /> April 3,2008 <br /> that the California State Water Resources Control Board requires for submittal. This <br /> document was dated February 4; 1997. Both of these two documents indicate that the date of <br /> the release is "unknown" and copies are included in Appendix B. <br /> 2.2 Site Investigation <br /> As outlined above in Section 1.0, the site investigation has consisted of several soil borings, <br /> the installation of monitoring wells, and receptor well surveys. These efforts generated a <br /> significant amount of data that will be summarized in the following sections: <br /> 2.2.1 Soil <br /> { Soil samples were collected from both the vadose and saturated zones. The data were used to <br /> estimate the lateral and vertical extent of the contamination in the two media. Specific <br /> analyses that have been utilized in the investigation include: <br /> * Diesel range petroleum hydrocarbons (TPH-D)by EPA method 3540/8015(m) <br /> • Gasoline range petroleum hydrocarbons (TPH-G) by EPA method 5030/8015(m), <br /> 8260 a <br /> • Benzene, Toluene, Ethylbenzene and Xylene (BTEX)by EPA method 8020 <br /> • Lead by EPA method 6010, 7240 (for soil disposal) <br /> f • Halogenated organics by EPA method 8010 <br /> The soil laboratory data generated during the investigation are summarized in Tables 1 and 2 <br /> f in Appendix A. Figure 2 contains the locations of the boreholes advanced in the current <br /> investigation. Appendix C includes the borehole logs generated in the site investigation. <br /> Select soil samples were also analyzed for geotechnical parameters by Cooper Testing Lab <br /> Inc. and this data is included in the following table: <br /> { <br /> Sample Particle Size Distribution Soil <br /> Gravel % Sand% Silt% Clay% Classification <br /> MW-7 @ 20' - 18.8 46.7 34.5 SILT w/sand <br /> MW-10 @ 25' - 7.3 59.0 33.7 SILT w/trace sand <br /> MW-10 @ 30' 25.8 54.1 20.1 SILT w/sand <br /> MW-109 @ 75' 3.0 55.3 41.7 CLAY silty <br /> SB-6 @ 35' L 0.5 1 83.7 9.$ 1 6.0 1 Silty SAND <br /> Sample Permeability Organics Density Porosity <br /> { cm/sec) % ) <br /> ` MW-7 @ 20' 1 x 10E-7 2.1 99.5 43.08 <br /> MW-10 @ 25' 1 x 10E-6 1.6 90.5 48.18 <br /> MW-10 @ 30' 9 x 10E-7 1.3 93.9 46.24 <br /> MW-109 @ 75' 3 x 10E-6 2.0 82.5 52.75 <br /> SB-6 @ 35' 2 x 10E-4 0.8 103.8 38.42 <br /> i <br />