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�.. Margrave Property %wool �+ <br /> Report-Soil Boring Installation <br /> Project No. 148.2 <br /> January 7,1994 <br /> ,r. Page 4 <br /> \,lor <br /> UW <br /> soils containing decaying organic matter). The detailed boring logs are attached <br /> in Appendix B. <br /> 3.2 Site Hydrology <br /> �. The exact depth to groundwater at this site is not known at this time. However, <br /> it may be approximately at a depth of 55 feet below ground surface (reference- San <br /> Joaquin County Flood Control and Water Conservation District Map Lines of <br /> Equal Depth to Water in Wells Spring 1989 attached as Figure 3). <br /> 3.3 Hydrocarbon Distribution in the Soil <br /> V <br /> Soil samples were collected while drilling the soil borings. These data are <br /> summarized and shown below as Table 1. Copies of the laboratory analytical <br /> reports are attached as Appendix A. As this data shows, aromatic hydrocarbons <br /> are present at shallow depths on the tank excavation but are not present in the <br /> bore hole samples starting at 9.5 feet of depth. <br /> Table 1 Soil Analytical Data <br /> Date Sample Benzene Toluene Ethylbenzene Xylene TPH-Gas <br /> 4g/kg 4g/kg µ /k <br /> 03/02/93 TK-1®8' ND(<5.0) ND(<5.0) 5.6 94 ND(<2.5) <br /> wr 03/02/93 N.Sidewall®7.5' ND(<500) ND(<500) 4400 37000 1400 <br /> 12/16/93 SB-1 9.5-10.0' ND(<3.0) ND(<3.0) ND(<3.0) ND(<3.0) ND(<10) <br /> 12/16/93 SB-1 14.0-14.5' ND(<3.0) ND(<3.0) ND(<3.0) ND(<3.0) ND(<1.0) <br /> 12/16/93 SB-1 29.5-30.0' ND(<3.0) ND(<3.0) ND(<3.0) ND(<3.0) ND(4.0) <br /> 12/16/93 SB-2 9.5-10.0' ND(<3.0) ND(<3.0) ND(<3.0) ND(<3.0) ND(<1.0) <br /> 12/16/93 SB-2 19.0-19.5' ND(<3.0) ND(<3.0) ND(<3.0) ND(<3.0) ND(<1.0) <br /> 12/16/93 SB-2 29.5-30.0' ND(<3.0) ND(<3.0) ND(<3.0) ND(<3.0) ND(<1.0) <br /> 12/16/93 SB-3 9.5-10.0' ND(<3.0) ND(<3.0) ND(<3.0) ND(<3.0) ND(<1.0) <br /> 12/16/93 SB-3 19.5-20.0' ND(<3.0) ND(<3.0) ND(<3.0) ND(<3.0) ND(<1.0) <br /> 12/16/93 SB-3 29.5-30.0' ND(<3.0) ND(<3.0) ND(<3.0) ND(<3.0) ND(<1.0) <br /> w 12/16/93 SB-4 9.5-10.0' ND(<3.0) ND(<3.0) ND(<3.0) ND(<3.0) ND(<1.0) <br /> 12/16/93 SB-4 19.5-20.0' ND(<3.0) ND(<3.0) ND(<3.0) ND(<3.0) ND(<1.0) <br /> 12/16/93 SB4 29.5-30.0' ND(<3.0) ND(<3.0) ND(<3.0) ND(<3.0) ND(4.0) <br /> ND=not detected (detection limits in parentheses) <br /> Note: The sample SB-1 9.5-10.0 ' was also tested for total lead and EDB, results ND <br /> 1.d <br /> 4.0 QUALITY ASSURANCE PROGRAM <br /> The following measures were taken by Geological Technics Inc. to ensure that a <br /> high quality study was conducted and that cross contamination does not occur. <br /> two <br /> w <br />