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Mr. M. Scott Mansholt—CEMC <br /> Fourth Quarter 2006 Groundwater Monitoring and Sampling Report and <br /> Annual Summary Report January 12,2007 <br /> US Can-Welty Road Page 8 of 8 <br /> CLOSING <br /> If you have any questions regarding this report, please call Chris Dennis at(916) 979-3566. <br /> Sincerely, <br /> SCIENCE APPLICATIONS INTERNATIONAL CORPORATION <br /> 6'a 'el nze(lo� Christopher B.Dennis, P.G. 5�0OAL G� <br /> Staff Geologist Senior Geologist GAO <br /> aCHRIST$PHI;R ; <br /> Enclosures: DENSIS <br /> � � 1 <br /> Figure 1: Vicinity Map , No.7184 'F. <br /> Figure 2: Site Map 1' ¢ <br /> Figure 3: Potentiometric Surface Map—Fourth Quarter 2006 �Cp CAL-�FQ <br /> Figure 4: Petroleum Distribution in Groundwater During 2006 <br /> Figure 5: Potentiometric Surface Map—First Quarter 2006 �xptres August t ��t <br /> Figure 6: Potentiometric Surface Map—Second Quarter 2006 <br /> Figure 7: Potentiometric Surface Map—Third Quarter 2006 <br /> Table 1: Groundwater Elevation Data and SPO Thickness Measurements <br /> Table 2: Groundwater Chemical Analytical Results—TPH, MTBE, and BTEX <br /> Table 3: Groundwater Chemical Analytical Results—PAHs <br /> Table 4: Summary of Groundwater Flow Directions and Gradients <br /> Table 5: Monitoring Well Construction Details <br /> Attachment A: Field Data Sheets <br /> Attachment B: Data Usability Summary and Laboratory Chemical Analytical Report <br />