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c <br /> nl <br /> DISCUSSION <br /> . At the time of the third quarter 2005 monitoring event, groundwater elevations had decreased between <br /> 1 89 and 3 96 feet in all wells since the previous monitoring event(May 27, 2005) Groundwater levels are <br /> fluctuating within historical ranges Wells MW-1 and VW were dry, consistent with historical data <br /> TPHG (850 ltg/L), benzene (0 64 �tgIL), and MTBE (0 72 µg/L) were reported in well MW-13 TPHG (350 <br /> µg/L) and 1,2-DCA (5 8 µg/L) were reported in well MW-14 1,2-DCA (10 µg/L) was reported in well AS-1 <br /> TBA, DIPE, ETBE, TAME, or EDB were not reported in any of the wells Analyte concentrations 1n well <br /> MW-13 show a small increase compared to the second quarter 2005 Analytical data for wells MW-14 <br /> and AS-1 are generally consistent with historical data <br /> Bloventina <br /> Bioventing activities were initiated on November 16, 2004 An oil-less compressor is utilized to pump air <br /> into wells MW-13, MW-14, and AS-1 In wells MW-13 and MW-14, the air is delivered via drop tubes <br /> installed to approximately 1 foot above the bottom of the well In well AS-1, the air is applied directly to the <br /> well casing, as in conventional sparging The air is delivered to the wells via subsurface conveyance <br /> piping During the third quarter 2005, the airflow from the compressor to the wells ranged from 60 to 62 <br /> liters per hour at pressures ranging from 26 to 30 pounds per square inch <br /> ATTACHMENTS <br /> • Table 1 Groundwater Elevation and Analytical Summary <br /> • Table 2 Bioventing System Operation Parameters <br /> • Figure 1 Site Location Map <br /> • Figure 2 Site Map and Groundwater Analytical Summary <br /> • Appendix A Field Data Sheets <br /> • Appendix B Sampling and Analysis Procedures <br /> • Appendix C Certified Analytical Reports and Cham-of-Custody Documentation <br /> K Ueichert%Stockton-I 031Quaner1y120051Tetcher1_3Q05 DOC SrKATU5 <br />