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i <br /> f <br /> DISCUSSION <br /> At the time of the fourth quarter 2005 monitoring event, groundwater elevations had increased 154 and <br /> 0 90 feet in wells MW-13 and MW-14, and decreased 0 78 feet in well AS-1 since the previous monitoring <br /> event (September 20, 2005) Groundwater levels are fluctuating within historical ranges Wells MW-1 <br /> and VW were dry, consistent with historical data <br /> TPHG (390 pgll_) was reported in well MW-13 TPHG (190 µg/L) and 1,2-DCA (5 9 pg/L) were reported in <br /> well MW-14 1,2-DCA (12 pg/L) was reported in well AS-1 Benzene, MTBE, TBA, DIPE, ETRE, TAME, <br /> or EDB were not reported in any of the wells Analytical data for wells MW-13, MW-14, and AS-1 are <br /> generally consistent with historical data <br /> Bioventing <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 ASA 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 fourth quarter 2005, the airflow from the compressor to the wells ranged from 40 to 50 <br /> liters per hour at pressures ranging from 25 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 Chain-of-Custody Documentation <br /> • <br /> K 1TeichertlStockton-1 031Quancr1y120051Teichert_4Q05 DOC STRATUS <br />