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summarized on Table 1 Laboratory reports and chain-of-custody documentation are presented in Appendix C Groundwater Analytical Results ' TPI-Ig was not detected above its laboratory method detection limits for the groundwater samples collected at the Site TPHd was detected in the groundwater samples collected from wells MW-2, ' VW-1 and VW-2 at concentrations of 510, 210 and 2,200 µg11,respectively Benzene was detected in groundwater samples collected from wells MW-3 and VW-2 at concentrations of 9 1 and 200 µg/l, respectively Ethylbenzene and total xylenes were detected in the groundwater samples collected ' from wells MW-3 and VW-2 at concentrations ranging from 5 4 to 90 µg/1 Total xylenes were also detected in the groundwater sample collected from well MW-4 at a concentration of 2 8 µg/1 MTBE and TAME were detected in the groundwater sample collected from well VW-2 at concentrations of 120 and 60 µg/1, respectively TAME was also detected in the sample from well MW-2 at 9 µg/1 DIPE, TBA and ETBE were not detected above laboratory method detection limits in the groundwater samples collected at the Site TPHg, TPI-Id, benzene, MTBE and TAME concentrations ' for the First Quarter-2002 monitoring event are shown on Figure 3 CONCLUSIONS ANIS RECOMMENDATIONS ' The lateral limits of dissolved phase petroleum hydrocarbons in groundwater are not defined to the west of well VW-1 and may extend beneath B Street Geocon recommends that quarterly ' groundwater monitoring continue at the Site to evaluate seasonal trends in groundwater elevation and contaminant concentrations in the vicinity of the former UST locations at the Site The next groundwater monitoring event is scheduled for July 2002 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, �pFESS/Oty, GEOCON CONSULTANTS, �JU Z foo.4609 end, PE, CEG * P• Rebecca L Silva, REA ' ject Manager �9T4:"^ OQ�' Project Environmental Scientist OF CALF ' RLS JEJ sdb (5) Addressee ' Attachments Figure 1, Vicinity Map Figure 2, Groundwater Elevation Map -May 2002 Figure 3, Petroleum Hydrocarbons in Groundwater-May 2002 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 Pro}ect No 58475-06-24 -3- June 24,2002