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1 <br /> Gea4kal reckn a 144 Page 2 <br /> Site Conceptual Model Report <br /> Marci Property <br /> Project No 7012 <br /> August 23,2004 <br /> The data compiled during the course of this investigation indicate that the soil and <br /> ' groundwater were impacted with diesel range petroleum hydrocarbons <br /> ' 2.0 ASSESSMENT OF IMPACT <br /> 2.1 Release Documentation <br /> GTI has not performed a review of an underground storage tank removal activity <br /> P Y g g <br /> documentation on file at SJC PHS/EHD A file review should be performed to obtain soil <br /> ' confirmation sampling data and confirm release dates <br /> 2.2 Site Investigation <br /> ' As outlined above in Section 10, the site s,investigation has consisted of several soil borings, <br /> g <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 (arid vertical extent-of, <br /> the contanunation„-in the two media) Specific analyses that have been utilized in the <br /> investigation include <br /> m Diesel range petroleum hydrocarbons (TPH-D)by EPA method 3540/8015(m) <br /> ' 6 Gasoline range petroleum hydrocarbons (TPH-G) by EPA method 5030/8015(m) <br /> o Benzene, Toluene, Ethylbenzene and Xylene (BTEX) by EPA method 8020 <br /> Select soil samples were also analyzed for lead as a prerequisite for off site disposal. The soil <br /> laboratory data generated during the investigation are summarized in Tables 1 and 2 in <br /> Appendix A Figure 2 contains the locations of the boreholes advanced in the current <br /> ' investigation Appendix B includes the borehole logs generated in the site investigation <br /> Select soil samples from boring MW-4 (September 4997) were also analyzed-for-geotechnical <br /> ' parameters porosity, bulk density and organic content This data is also included in <br /> Appendix A <br /> ' 2.2.2 Groundwater <br /> Wm J Hunter & Associates commenced groundwater monitoring in April 1992 and <br /> intermittent monitoring continued through 1998 Quarterly monitoring has been consistently <br /> performed from August 2000 and continues to the present The majority of the groundwater <br /> analyses were performed for diesel range petroleum hydrocarbons because the former USTs <br /> contained diesel fuel Specific analyses that have been utilized in the investigation include <br /> 0 Total Petroleum Hydrocarbons as Diesel (TPH-D)by EPA method SW3500/M8100 <br />