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11 , <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 exception of well MW-1 MTBE was detected in <br /> well MW-1 at a concentration of 6 51 micrograms per Liter (�tg/L) The groundwater flow direction <br /> (southeast) and gradient were generally consistent with previous sampling events Groundwater elevation <br /> decreased 1 13 feet in the wells from the previous sampling event (March 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 /> Implementation of AS/SVE will begin after PG&E provides electrical hook-up to the system AS/SVE <br /> operation will include system startup consistent with SJVAQMD regulations <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Figure 1 Groundwater Analytical Summary (Second Quarter 1999) <br /> • Figure 2 Groundwater Elevation Contour (Second Quarter 1999) <br /> • Appendix A Sampling and Analysis Procedures <br /> • Appendix S Laboratory Analysis Reports and Chain-of-Custody Records <br /> • Appendix C Field Data Sheets <br /> • <br /> CP1C 1Arctuve\Arco105481Qtdy\0548Q299 DOC-9811sg 1 PC!? ad& <br />