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Mr. M. Scott Mansholt—CEMC <br /> Second Quarter 2007 Groundwater Monitoring and Sampling Report July 24,2007 <br /> Vernalis Pump Station Page S of S <br /> values were estimated concentrations detected between the method detection limit and limit of <br /> quantitation. The associated primary samples did not have detectable PAHs. <br /> Based on current and historic groundwater sampling results for this site and the apparent size and <br /> stability of the TPHd groundwater plume, SAIC recommends reducing groundwater monitoring <br /> and sampling from quarterly to semi-annual events. <br /> CLOSING <br /> If you have any questions regarding this report, please call Tom Burns at(916) 979-3748. <br /> Sincerely, <br /> SCIENCE APPLICATIONS INTERNATIONAL CORPORATION <br /> CiO <br /> Thomas Hope om Burns, P.6. <br /> Project Scientist Senior Project Manager a TK 0 Wt A S <br /> B <br /> Enclosures e '' 44/r,8 <br /> Figure 1: Vicinity Map �, N o. 8053 <br /> • <br /> Figure 2: Site Map <br /> Figure 3: Potentiometric Surface Map—Second Quarter 2007 01C CALIFa�� <br /> Figure 4: Petroleum Distribution in Groundwater <br /> Table 1: Groundwater Elevation Data and SPO Thickness Measurements <br /> Table 2: Groundwater Analytical Results--TPHd, TPHg,BTEX, and MTBE <br /> Table 3: Groundwater Analytical Results—PAHs <br /> Attachment A. Field Data Sheets <br /> Attachment B: Data Usability Summary and Laboratory Analytical Report <br />