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,1 11 a it <br /> ©lscussloN <br /> Results of this monitoring event indicate that the levels of dissolved hydrocarbons are generally consistent <br /> with levels detected in previous sampling events, with the following exceptions TPHG, benzene, <br /> ethylbenzene, and total xylenes concentrations decreased to below method reporting limits in wells MW-1 <br /> and MW-5, and MTBE decreased to 7 52 micrograms per liter (ug/L) in well MW-5 MTBE was detected in <br /> well MW-2 at a concentration of 3 48 Mg/L and was below method reporting limits in well MW-3 -The <br /> groundwater flow direction (east) and gradient were generally consistent with previous sampling events <br /> Groundwater elevation increased 0 91 feet in the wells from the previous sampling event (September <br /> 1999) <br /> A letter concerning oxygenate sampling of wells at this site was sent to the San Joaquin County Public <br /> Health Services (SJCPHS) along with the Tank Removal Report on May 4, 1998 The SJCPHS letter <br /> dated June 18, 1998, allowed analysis of samples from current monitoring wells using U S Environmental <br /> Protection Agency (USEPA) Method 8020 After installation of any new on-site or off-site wells, SJCPHS <br /> will require oxygenate analysis using USEPA Method 8260 <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Figure 1 Groundwater Analytical Summary (Fourth Quarter 1999) <br /> • Figure 2 Groundwater Elevation Contour (Fourth Quarter 1999) <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\N%CamPk\Data\Arc]uveWco10548%Qtr]y10548Q499 DOC 98Usg 1 1T Corporation <br /> 03/10/00 <br />