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U <br /> d <br /> DISCUSSION <br /> . At the time of the first quarter 2006 monitoring event, groundwater elevations had increased between 1 13 <br /> and 2 75 feet in wells MW-13, MW-14, and AS-1 since the previous monitoring event (December 20, <br /> 2005) Groundwater levels are fluctuating within historical ranges Wells MW-1 and VW were dry, <br /> consistent with historical data <br /> TPHG (2,400 pg/L) and MTBE (2 5 µg/L) were reported in well MW-13 TPHG (250 pg/L) and 1,2-DCA <br /> (6 4 pg/L) were reported in well MW-14 1,2-DCA (12 pg/L) was reported in well AS-1 Benzene, TBA, <br /> DIPE, ETBE, TAME, or EDB were not reported in any of the wells Analytical data for wells MW-13, <br /> MW-14, and ASA are generally consistent with historical data <br /> Bioventmn <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 On February 1, 2006 and March 17, 2006 the airflow from the compressor to the wells was 60 <br /> liters per hour at a pressure of 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 /> K1Telcher6Stockton-I031Quarter1y120061Tecchen_1 Q06 DOC STRATUS <br />