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Quik Stop Station No 39 February 14 2003 <br /> Stockton California Results Report and Work Plan Addendum <br /> •'' Environmental Protection Agency Method 8260B The groundwater sample collected from <br /> soil boring SBI was additionally analyzed for methanol and ethanol by EPA Method 8260B <br /> RESULTS OF ADDITIONAL SUBSURFACE INVESTIGATION <br /> The CPT log (Appendix C) indicates that the soil profile to 100 feet bsg is dominated by silt, <br /> clayey silt and clay (including soils logged as stiff fine grained) with minor interbedded <br /> sand The interval from approximately 95 to 100 feet bsg is characterized by interbedded <br /> sand and silt The pore-dissipation test indicated the groundwater level was approximately <br /> 61 feet bsg Unsuccessful groundwater sampling attempts indicate that fine-grained soil near <br /> the water table (approximately 46 to 61 feet bsg) in the areas of soil borings SB 1, S132 and <br /> SB3 do not readily allow flow of groundwater <br /> Analytical results of groundwater samples collected via CPTlhydropunch are summarized in <br /> • Table 2 Analytical reports and COC document are contained in Appendix D <br /> Concentrations of TPHg were reported in groundwater samples W-76-80-SB4 and W-56-65- <br /> S135 at 230 micrograms per liter (parts per billion or ppb) and 56 ppb, respectively A <br /> concentration of 0 54 ppb toluene was reported in sample W-96-100-SBI A concentration <br /> of 15 ppb TBA was reported in sample W-56-65-SB5 No other BTEX compounds, fuel <br /> oxygenate compounds, DCA or EDB were reported in the groundwater samples <br /> Results of the CPT investigation indicate that groundwater at the locations of soil borings <br /> I <br /> SBI through S135 is not impacted by DCA Vertical delineation of DCA is confirmed by the <br /> investigation results, specifically by the 94 to 100 feet bsg samples from soil borings SB 1 <br /> and SB2 Lateral delineation of DCA is indicated by the shallower groundwater samples <br /> collected from soil borings S134 and S135 The lateral delineation of DCA at the water table <br /> was not confirmed in the area of monitoring wells MW-1 through MW-3 <br /> • <br /> C IProjects170391I41WPaddnm2-03 doe <br /> Project No 703914 5 HORIZON ENVIRONMENTAL INC <br />