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Current Phase of Project Monitoring/Assessment <br /> Frequency of Groundwater Sampling Wells MW-1 through MW-6 = Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sampling Date September 29, 1998 <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 28 39 to 30 13 <br /> Direction of Groundwater Flow East <br /> Groundwater Gradient 0 004 ft/ft <br /> DISCUSSION <br /> Results of this monitoring event indicate that the levels of dissolved hydrocarbons in wells MW-1 through <br /> MW-6 are generally consistent with levels detected in previous sampling events The groundwater flow <br /> direction (eastward) and gradient were generally consistent with previous sampling events Groundwater <br /> elevation decreased 1 76 feet in the wells from the previous sampling event (June 1998) <br /> • Pinnacle conducted on-site drilling and installation of airsparge wells AS-1, AS-2 and AS-3 and installation <br /> of vapor extraction wells VW-5S and VW-5D in October 1998 Results of drilling activities will be <br /> evaluated with respect to lateral and vertical extent of soil and groundwater impacts <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Table 2 Groundwater Analytical Results for Oxygenates (USEPA Method 8260) <br /> • Figure 1 Groundwater Analytical Summary (Third Quarter 1998) <br /> • Figure 2 Groundwater Contour Map (Third Quarter 1998) <br /> • Appendix A Sampling and Analysis Procedures <br /> • Appendix B Laboratory Analysis Reports and Chain-of-Custody Records <br /> • Appendix C Field Data Sheets <br /> CP\D 1QMR13RDQTR-1165480398 DOC-981?')') I �� <br />