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Mr. James L. Barton <br /> February 20, 2009 <br /> Page 2 <br /> Unit C monitoring wells. The remaining estimated hydrocarbon and benzene mass is shown in the table <br /> below. <br /> 4QO8 TPHg Mass(pounds) 4QO8 Benzene Mass(pounds) <br /> Groundwater Mass 102 1.5 <br /> Soil Mass 1668 4.0 <br /> Total 1770 5.5 <br /> The spreadsheet used for calculating the remaining mass as well as the assumptions used in the estimate is <br /> included as Appendix A. As reported in the Quarterly Groundwater Monitoring and Remediation Status <br /> Report and Updated Site Conceptual Model for the Fourth Quarter of 2008 dated January 12, 2009, the soil <br /> vapor extraction system removed approximately 737 pounds of TPI-Ig during the fourth quarter of 2008. <br /> Iso-concentration maps used to estimate the aerial extent of the contamination used in the estimate are <br /> included in Appendix B. <br /> Remarks/Sianatures <br /> The interpretations in this report represent AECOM's professional opinions and are based, in part, on <br /> information supplied by the client pertaining to monitoring and remedial activities that occurred prior to <br /> AECOM's involvement with the Site, which began in 2003. These opinions are based on currently available <br /> information and are arrived at in accordance with currently accepted hydrogeologic and engineering <br /> practices at this time and location. Other than this, no warranty is implied or intended. <br /> If you have any questions regarding this project, please contact Mike Fischer at(916) 362-7100. <br /> Sincerely, <br /> AECOM Environment <br /> karma <br /> Michael Fischer Kent D. Baugh, D, P.E. #C28941 <br /> Project Engineer/Project Manager Principal Technical Specialist <br /> QROFESS/pN <br /> cc: Ms. Stephanie Furgal, EMC <br /> Mr. Mike Infurna, San Joaquin County, Environmental Health Division d% <br /> Mr. Jay Allen, Stone Brothers Management Company No. C 28941 e <br /> Ms. Nicole Gleason, Downey Brand * Exp. 3.31-11 <br /> Attachments: r� C/y►L <br /> Or CALXF <br /> Appendices <br /> A Mass Estimate Spreadsheet <br /> B Iso-concentration Figures <br /> AECOM Environment I AECOM <br />