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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 /> ' Vernalis Pump Station Page 7 of 7 <br /> concentrations appear stable within the range of fluctuation. PAH concentrations remained stable at low <br /> ' concentrations. SPO has been observed in well MW-1 since 1998 and a total of 0.16 gallon has been <br /> extracted from that well. <br /> SAIC will continue quarterly monitoring at this site as recommended in the RWQCB letter dated <br /> September 20,2006. TPHg and BTEX have not been detected in groundwater at the site wells and will <br /> be eliminated from future analytical sampling events beginning first quarter of 2007. The oleophilic sock <br /> in well MW-1 will be monitored quarterly and replaced as necessary. When the petroleum sheen has <br /> ' been removed, SAIC recommends that well MW-1 be incorporated into the monitoring and sampling <br /> program. <br /> CLOSING <br /> If you have any questions regarding this report,please call Chris Dennis at(916) 979-3866. <br /> Sincerely, <br /> SCIENCE APPLICATIONS INTERNATIONAL CORPORATION <br /> 01r <br /> CHRISTOPHER 0 <br /> B. <br /> Laura Sanc / Christopher B.Dennis,P.G. DENN)S <br /> Staff Geologist Senior Geologist 9 No.7184 <br /> Enclosures QF CAI XV0 <br /> ' Figure 1: Vicinity Map r-►�-'_0 <br /> Figure 2: Site Map ' _ 's r`" stip <br /> Figure 3: Potentiometric Surface Map—Fourth Quarter 2006 <br /> Figure 4: Petroleum Distribution in Groundwater During 2006 <br /> Figure 5: Potentiometric Surface Map—First Quarter 2006 <br /> Figure 6: Potentiometric Surface Map—Second Quarter 2006 <br /> 1 Figure 7: Potentiometric Surface Map—Third Quarter 2006 <br /> Table 1: Groundwater Elevation Data and SPO Thickness Measurements <br /> Table 2: Groundwater Analytical Results—THPd,TPHg, and BTEX <br /> ' Table 3: Groundwater Analytical Results—PAHs <br /> Table 4: Summary of Groundwater Flow Direction and Gradient <br /> Table 5: Monitoring Well Construction Details <br /> ' Attachment A: Field Data Sheets <br /> Attachment B: Data Usability Summary and Laboratory Analytical Report <br />