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_ f <br /> Y <br /> Second Semiannual 2011 Groundwater Monitoring Report <br /> Former Texaco Service Station <br /> Chevron Site ID 309075 <br /> February 28, 2012 <br /> LIST OF FIGURES <br /> Figure 1 Site Location Map <br /> L Figure 2 Site Plan <br /> Figure 3 Groundwater Elevation Contour Map, 14 October 2011 <br /> Figure 4 TPH-MO with SGC, TPH-DRO with SGC and TPH-GRO Concentration <br /> Map, 14 October 2011 <br /> Figure 5 Benzene, MTBE and 1,2-DCA Concentration Map, 14 October 2011 <br /> LIST OF TABLES <br /> L <br /> Table 1.1 Second Semiannual 2011 Groundwater Monitoring and Analytical Data <br /> Table 1.2 Second Semiannual 2011 Groundwater Analytical Data <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 /> LLIST OF ATTACHMENTS <br /> L Attachment A Site History and Previous Investigations <br /> Attachment B Groundwater Monitoring & Sampling Data Package, Gettler-Ryan Inc., <br /> October 24, 2011 <br /> C Attachment C Laboratory Analytical Results, Lancaster Laboratories, Inc., <br /> November 28, 2011 <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, 4.1 & 4.2) Historical Groundwater Monitoring and <br /> Analytical Data <br /> Attachment G (Figures 1 through 7) Chemical Concentrations and Groundwater <br /> Elevation versus Time Graphs <br /> LIST OF REFERENCES <br /> L <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 995, revised <br /> f February 2008). California: February 2008. <br /> F•� 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 /> L <br /> g:\aproject\env\chevron1.309075\6 deliverables\periodic monitoring12011\2sa11\temppdt\text\309075 2sa11 gmr fin 02282012.doc ii + <br /> } <br /> 1 � �f <br />