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4eo4gccal7"edcnccs Inc Page 4 <br /> Groundwater Monitonng Report <br /> Project No 989 2 <br /> March 29,2004 <br /> Historical groundwater bearing and slope are summarized in Table 2 and a summary of <br /> ' vertical groundwater is included as Table 3 of Appendix A A Rose Diagram is attached as <br /> Figure 4 <br /> ' As required under AB2886, the depth to groundwater data was submitted electronically to <br /> GeoTracker on March 22, 2004, with confirmation number 6253040909 <br /> ' 2.2 Groundwater Analytical Results <br /> • Low concentrations of TPH-G and BTEX were detected in MW-I and MW-4 TPH-G <br /> ' and BTEX constituents were not present in any other monitoring wells <br /> • Trace concentrations of MtBE were present in MW-1 <br /> ' • Low concentrations of MtBE were present in MW-4, MW-5, MW-6, MW-8 and MW-9 <br /> The levels are consistent with previous monitoring events <br /> • A plot of TPH-G versus groundwater elevation for MW-1 shows that generally the <br /> ' concentrations of TPH-gasoline fluctuate with groundwater elevation and that the <br /> overall concentrations have decreased two orders of magnitude over time <br /> • Historically, the fuel oxygenates DIPS, ETBE, TAME and TBA as well as 1,2 DCA and <br /> EDB have not been detected in any of the site's monitoring wells This holds true for <br /> the new monitoring wells These constituents are no longer analyzed in groundwater <br /> ' samples collected at this site <br /> Laboratory Data Sheets are included in Appendix C The data are summarized in Table 1 of <br /> ' Appendix A Chart 1 is a plot of TPH-G versus groundwater elevation for MW-1 Chart 2 <br /> is a plot of MtBE versus groundwater elevation for MW-6 <br /> ' During purging of the monitoring wells, field measurements of the oxidation-reduction <br /> potential (ORP) of the water were taken using an YSI 3560 Flowcell meter During this <br /> groundwater-monitoring event, dissolved oxygen was measured to all the wells using an <br /> ' YSI dissolved oxygen meter These measurements are summarized in Table 4 of Appendix <br /> A and in the field logs of Appendix B <br /> ' 3.0 CONCLUSIONS AND RECOMMENDATIONS <br /> ' The following conclusions have been drawn from the data generated from this site <br /> investigation work <br /> 1 <br />