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n , <br /> DISCUSSION <br /> • At the time of the second quarter 2005 monitoring event, groundwater elevations had Increased between <br /> 0 78 and 9 64 feet in all wells since the previous monitoring event (March 15, 2005) Groundwater levels <br /> are fluctuating within historical ranges Wells MW-1 and VW were dry, consistent with historical data <br /> TPHG (200 }_Lg/L), ethylbenzene (3 2 Ag/L), and xylenes (2 91 µg/L) were reported in well MW-14 <br /> 1,2-DCA was reported in well AS-1 (11 pg/L) Benzene, MTBE, TBA, DIPE, ETBE, TAME, or EDB were <br /> not reported in any of the wells Concentrations of TPHG, BTEX, and oxygenates were reported below <br /> laboratory detection limits for the first time in well MW-13, while concentrations of hydrocarbons reported <br /> in wells MW-14 and AS-1 are generally consistent with historical data <br /> Bloventing <br /> Bloventing 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 spargmg The air is delivered to the wells via subsurface conveyance <br /> piping During the second quarter 2005, the airflow from the compressor to the wells ranged from 62 to 70 <br /> liters per hour at pressures ranging from 26 to 29 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 <br /> • Appendix A Field Data Sheets <br /> • Appendix B Sampling and Analysis Procedures <br /> • Appendix C Certified Analytical Reports and Chain-of-Custody Documentation <br /> • <br /> K1TelcherMtockton-I031Quarterly12005\Teichert_2Q05 DDC STRATUS <br />