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S E C O R <br /> • • UPSV-2: TPHg <br /> • UPSV-3: TPHg <br /> • UPSV-6: TPHg <br /> As shown in Table 26 analyte concentrations did not increase in any UPSV wells between the <br /> fourth quarter 2007 sampling event and February 15, 2008: <br /> As shown in Table 26, TPHg has historically decreased in wells UPSV-1, UPSV-2, and UPSV-6 <br /> since the first sampling event in July 2005. Additionally, benzene and ethylbenzene show a <br /> general decreasing trend in well UPSV-6 (Figure 24). There have been no other apparent trends <br /> associated with reported concentrations in the UPSV wells. <br /> 6.2.4 QA/QC-Samples and General Laboratory Notes <br /> Duplicate samples APSV-10-D and UPSV-2D were collected from two soil vapor points <br /> (APSV-10 and UPSV-2) during the first quarter 2008 sampling event. A comparison of the <br /> samples is shown below. <br /> 6.2.4.1 First Quarter 2008; February 15, 2008 <br /> Analyte Sample # Sample # % Difference <br /> APSV-10 APSV-10-D <br /> TPHg mV 208 222 (+/-) 6.5 <br /> • Benzene mV <0.03 <0.03 0% <br /> Toluene mV 0.06 0.06 0% <br /> Eth (benzene mV <0.02 <0.02 0% <br /> Total Xylenes m 0.05 0.07 (+/-) 33% <br /> Methane pmV <1,000 <1,000 0% <br /> Note:ppmV-Parts per million by volume. <br /> Sample # Sample # <br /> Analyte IX Difference <br /> UPSV-2 ..UPSV-2D <br /> TPH mV 7 6 (+/-) 15% <br /> Benzene (ppmV) <0.03 <0.03 0% <br /> Toluene mV <0.05 <0.05 0% <br /> Ethylbenzene (ppmV) <0.02 <0.02 0% <br /> Total Xylenes mV <0.02 <0.02 0% <br /> Methane ppmV <1,000 <1,000 0% <br /> Note:ppmV-Parts per million by volume. <br /> Trip blanks did not contain analytes at or above laboratory reporting limits. <br /> 6.2.5 Conclusions and Recommendations <br /> • Reported TPHg concentrations ranged from non detect (less than 2.4 ppmv) in wells APSV-3, <br /> APSV-6, APSV-7 APSV-8, UPSV-1 and UPSV-6 to 269 ppmv in well APSV-9 during the <br /> 1QO8QSSRQRSRQMR.Final.doc 31 April 30,2008 <br /> 777W.26397.42.1307 <br />