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amecIO <br /> Mr. Howard Hold <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> April 27, 2010 <br /> Page 9 <br /> Enclosures: <br /> Tables <br /> Table 1 Groundwater Levels and Elevations <br /> Table 2 Groundwater Analytical Results —Lathrop Facility <br /> Figures <br /> Figure 1 Site Location Map <br /> Figure 2 Groundwater Elevation Contour Map, Lathrop Facility— December 2009 <br /> Figure 3 Groundwater Elevation Contour Map, Lathrop Facility—January 2010 <br /> Figure 4 Groundwater Elevation Contour Map, Lathrop Facility— February 2010 <br /> Figure 5 TPH-diesel, Cr, and Cr VI Concentrations in Groundwater Samples, <br /> Lathrop Facility <br /> Figure 6 Cr and Cr VI Concentration vs. Time, Well LPW-1, Lathrop Facility <br /> Figure 7 TPH-diesel Concentration vs. Time, Well LPW-1, Lathrop Facility <br /> Figure 8 Cr and Cr VI Concentration vs. Time, Well LPW-2, Lathrop Facility <br /> Figure 9 TPH-diesel Concentration vs. Time, Well LPW-2, Lathrop Facility <br /> Figure 10 Cr and Cr VI Concentration vs. Time, Well LPW-3, Lathrop Facility <br /> Figure 11 TPH-diesel Concentration vs. Time, Well LPW-3, Lathrop Facility <br /> Appendixes <br /> Appendix A Field Sampling Records <br /> Appendix B Laboratory Analytical Reports and Chain-of-Custody Documentation <br /> P:\10626.000.0\Docs\Semi-Annual Groundwater Monitoring&Sampling\Lathrop Monthly Groundwater Monitoring\Ltr_042710.doc <br />