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1 •a , Groundwater Analytical Results ' TPI-Ig was detected in samples collected from wells MW-14, VM-1 and VM-2 at concentrations of 2,300, 1,040 and 5,920 gg/l, respectively TPHd was also detected in the groundwater samples collected from wells MW-14, VM-1 and VM-2 at respective concentrations of 410, 210 and 1,210 ' µg/1 Benzene was detected in the groundwater samples collected from wells MW-14, VM-I and VM- 2 at concentrations of 741, 282 and 2,300 µg11, respectively Toluene, ethylbenzene and total xylenes were also detected in wells MW-14, VM-1 and VM-2 at concentrations ranging from 1 0 gg/1 (VM-1 - ' toluene) to 500 µg/1 (VM-2 - total xylenes) FOCs were not detected above their respective laboratory method detection limits in each of the groundwater samples TPHg, TPHd and benzene concentrations for the Second Quarter - 2004 monitoring event are depicted on Figure 3, Petroleum Hydrocarbons in ' Groundwater -May 2004 CONCLUSIONS ' The highest concentrations of dissolved phase petroleum hydrocarbons appear to be limited to the immediate vicinity of the former UST excavation area (monitoring wells MW-14, VM-1 and VM-2) It is understood that Caltrans has scheduled remediation activities at the Site 1 If there are any questions concerning the contents of this report, or if Geocon may be of further service,please contact the undersigned at your convenience ' Sincerely, GEOCON CONSULTANTS,IN ��€ ,� JUAIM /y,9'�& ' ekrc PE, CE �� M Rebecca L Silva, REA 1r O�wo;p Project Scientist (5) Addressee ' Attachments Figure 1, Vicinity Map Figure 2, Groundwater Elevation Map -May 2004 Figure 3,Petroleum Hydrocarbons in Groundwater-May 2004 ' Table 1, Summary of Groundwater Elevation and Analytical Data Appendix A, Summary of Historical Groundwater Analytical Data Appendix B, Monitoring Well Sampling Data Sheets Appendix C, Laboratory Reports and Chain of Custody Records— C -AG-e— �a9'L� 1 1 Project tato 68475-06-24K -3- June 22,2004