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The oxygenates, tertiary butanol, MTBE, D1PE, ETBE, and TAME were analyzed in samples collected <br /> from groundwater monitoring wells MW-1 through MW-7, and MW-10 using USEPA Method 8260 Wells <br /> MW-2 and MW-5 contained MTBE concentrations of 5 6 µg/l and 2 86 µg11, respectively No other <br /> oxygenates were detected in the wells <br /> Pinnacle shut down the SVE system on November 24, 1997, due to low sod vapor concentrations and is <br /> currently pulsing the system on a periodic basis The SVE system remained shut down during the third <br /> quarter 1999 <br /> The air sparge system was shut down on November 24, 1997, along with the SVE system to evaluate <br /> feasible remediation alternatives Based on data and remediation techniques evaluation, the air sparge <br /> system was restarted on January 20, 1998, and operated at a low flow rate for bubbling and oxygen <br /> addition to the groundwater The addition of oxygen into the groundwater will help to promote <br /> biodegradation of petroleum hydrocarbons in impacted groundwater at the site As a result of air bubbling <br /> in air sparge wells AS-1, AS-2, and AS-3, since January 1998, dissolved oxygen levels in monitoring wells <br /> MS-1(s), MS-2(s), MS-3(s), and MW-2 have increased significantly as shown in Table 5 Pinnacle will <br /> continue to monitor the effects of the SVE system pulsing and air bubbling during the fourth quarter 1999 <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Table 2 Groundwater Analytical Results for Oxygenates <br /> • Table 3 Operational Uptime Information of the Soil Vapor Extraction System <br /> • Table 4 Flow Rates and Results of Air Sample Analyses <br /> • Table 5 Extraction and Emission Rates <br /> • Table 6 Air Sparge/Air Bubbling Flow Rates and Dissolved Oxygen Levels <br /> • Figure 1 Groundwater Analytical Summary (Third Quarter 1999) <br /> • Figure 2 Groundwater Elevation Contours (Third Quarter 1999) <br /> • Appendix A Sampling and Analysis Procedures <br /> • Appendix B Chain-of-Custody Records and Laboratory Analysts Records <br /> • Appendix C Operation and Maintenance and Groundwater Monitoring Field Data Sheets <br /> CP\E\ARC0121301QTRLY12130Q299 DOC 9811sg 1 �usstc�C�¢ <br />