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Ms Lori Duncan Project No 880-039 1 A 01010000 <br /> August 3, 2004 <br /> Page 5 <br /> CONCLUSIONS <br /> Analytical results of groundwater samples collected from the site were generally consistent <br /> with previous sampling events Groundwater elevation increased in all wells except <br /> VW-lD and VW-4 between 0 51 and 161 feet from the previous sampling event <br /> (February 9, 2004) The groundwater elevations in wells VW-1D and VW-4 decreased <br /> 0 20 and 0 26 feet, respectively, since the last quarter The observed groundwater gradient <br /> during the first quarter 2004 was 0 017 to the southeast north of the site, and 0 06 to the <br /> northwest beneath the southeastern portion of the site Graphs showing TPHg and <br /> benzene concentrations, and groundwater elevations versus time in wells MW-1R, <br /> VW-2, and VW-3 are presented in Appendix E <br /> IApproximately 24 pounds of TPI-Ig were removed during the second quarter 2004 The <br /> system performed in compliance with permit requirements Pulsed operation of the SVE <br /> system began in the second quarter 2002, and continued during the second quarter 2004 <br /> Shaw will continue to perform quarterly groundwater sampling The next sampling <br /> event is tentatively scheduled for August 2004 <br /> Please call Mr Herzog at (916) 565-4377 if you have questions regarding this report or <br /> any aspect of the project <br /> ��Po D G EO4 O <br /> Sincerely, HQ�`�a <br /> SHAW ENVIRONMENTAL, INCclgp <br /> No.7211 ' <br /> Benjamin Chevlen David W Herzog, 1 <br /> Staff Geologist Project Manager OF <br /> Attachments Table 1 —Groundwater Monitoring Data <br /> Table 2—Treatment System Performance Data <br /> Table 3 —Treatment System Emission Rates and Destruction Efficiencies <br /> Table 4—Soil Vapor Extraction System Well Data <br /> Figure 1 —Site Location Map <br /> Figure 2—Groundwater Elevation Contour Map, Second Quarter 2004 <br /> Figure 3 —TPHg/Benzene Concentration Map, Second Quarter 2004 <br /> Appendix A—Groundwater Monitoring Field Data Sheets <br /> N 1sacDP120041Prj188018800391A 4ac doc SHAW ENVIRONMENTAL,INC <br />