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1� <br /> Fust Semiann ual 2012 Groundwater Monitoring Report <br /> Former Texaco Service Station <br /> Chevron Site ID 309075 <br /> r June 21, 2012 <br /> ►r <br /> LIST OF FIGURES <br /> Figure 1 Site Location Map <br /> Figure 2 Site Plan <br /> Figure 3 Groundwater Elevation Contour Map, 13 April 2012 <br /> Figure 4 TPH-MO with SGC, TPH-DRO with SGC, TPH-GRO Concentration Map, <br /> 13 April 2012 <br /> Figure 5 Benzene, MTBE, 1,2-DCA Concentration Map, 13 April 2012 <br /> C; LIST OF TABLES <br /> Table 1.1 First Semiannual 2012 Groundwater Monitoring and Analytical Data <br /> Table 1.2 First Semiannual 2012 Groundwater Analytical Data j <br /> Table 2 Historical Analytical Soil Data <br /> Table 3 Groundwater Gradient and Flow Direction Data <br /> Table 4 Soil Boring and Well Construction Details <br /> C <br /> LIST OF ATTACHMENTS <br /> C; Attachment A Site History and Previous Investigations <br /> Attachment B Groundwater Monitoring & Sampling Data Package, Gettler-Ryan Inc., ' <br /> April 19, 2012 <br /> Attachment C Laboratory Analytical Results, Lancaster Laboratories, Inc., May 2, 2012 <br /> Attachment D (Figure 1) Groundwater Flow Direction Rose Diagram <br /> Attachment E (Figure 1) Groundwater Elevation versus Time Graph <br /> Attachment F (Tables 1, 2.& 3) Historical Groundwater Monitoring and Analytical Data <br /> Attachment G (Figures 1 through 7) Chemical Concentrations and Groundwater <br /> Elevation versus Time Graphs <br /> LIST OF REFERENCES <br /> California Department of Water Resources. 2011. Water Data Library. Retrieved May 3, 2011 <br /> from www.water.ca.gov/waterdatalibrary. <br /> California Environmental Protection Agency Department of Toxic Substances Control. 2008. <br /> Representative Sampling of Groundwater for Hazardous Substances(July 1995, revised <br /> i <br /> February 2008). California: February 2008. <br /> Wiedemeier, T.H., H.S. Rifai, C.J. Newell and J.T. Wilson, 1999. Natural Attenuation of Fuel <br /> Hydrocarbons and Chlorinated Solvents in the Subsurface. John Wiley and Sons, NY. <br /> I <br /> I <br /> g:\aproject\env\chevron\309075\6 deliverables\periodic monitoring\2012\1 sa12\text\309075 1Sal 2 gmr fin 06212012.doc <br /> iti <br />