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' Mr. M. Scott Mansholt–CEMC <br /> First Quarter 2007 Groundwater Monitoring and Sampling Report April 24,2007 <br /> Vernalis Pump Station Page 5 of 5 <br /> ' fluctuated between non-detect levels to 930 the current concentrations appear stable within the <br /> range of fluctuation. PAHs remained stable at low concentrations. These constituents have been <br /> ' monitored since 1998 and SPO has been observed in well MW-1 since 1998. <br /> The site consists of two properties: the Bellini and Arcos properties. Investigative activities on these <br /> properties are essentially complete. Hydraulically down gradient of the former pump station is the <br /> ' Bogetti property,where additional groundwater investigation is required. As of the second quarter of <br /> 2007,the Bogetti property is a separate site—referred to as Vernalis Offsite—as accepted by the RWQCB <br /> in a letter dated February, 13, 2007. <br /> SAIC will continue quarterly monitoring at the site as recommended in the RWQCB letter dated <br /> September 20,2006. The oleophilic sock in well MW-1 will be monitored quarterly and replaced as <br /> necessary. SAIC recommends over-purging SPO and then collecting a sample from well MW-1. MW-1 <br /> ' has contained a sheen since 2005; over-purging may remove the residual hydrocarbons desorbing from <br /> the soil surrounding the well. <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 /> t <br /> t,5�0NAL GAO <br /> ' Daniel <br /> 4nzeon Christopher B. Dennis,P.G. O CHRISTOPHER <br /> Staff Geologist Senior Geologist per, B. Nl <br /> * DENNIS <br /> Enclosures 11�1 No.7184 ,�' <br /> Figure 1: Vicinity Map <br /> Figure 2: Site Map OF C�t-1� <br /> ' Figure 3: Potentiometric Surface Map–First Quarter 2007 <br /> Figure 4: Petroleum Distribution in Groundwater Expires August 31 ZcALX') <br /> Table 1: Groundwater Elevation Data and SPO Thickness Measurements <br /> ' Table 2: Groundwater Analytical Results–TPHd <br /> Table 3: Groundwater Analytical Results–PAHs <br /> Attachment A: Field Data Sheets <br /> ' Attachment B: Data Usability Summary and Laboratory Analytical Report <br /> Attachment C: General Minerals Analysis Table and Trilinear Diagram <br /> t <br />