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Groundwater Analytltcal Results <br /> TPI-Ig was detected in samples collected from wells MW-14, VM-1 and VM-2 at concentrations of <br /> 500, 310 and 2,300 gg/1, respectively TPHd was detected in the groundwater sample collected from <br />' well VM-2 at 740 gg/1 Benzene was detected in the groundwater samples collected from wells MW- <br /> 14, VM-1 and VM-2 at concentrations of 150, 50 and 840 gg/l,respectively Toluene was detected in <br /> wells MW-14 and VM-2 at concentrations of 6 4 and 8 5 gg/l, respectively Ethylbenzene and total <br /> xylenes were detected in wells MW-14, VM-1 and VM-2 at concentrations ranging from 2 6 gg/l <br /> (VM-1 - total xylenes) to 120 pg/1 (VM-2 - ethylbenzene) FOCs were not detected above their <br /> respective laboratory method detection limits in each of the groundwater samples TPHg, TPHd and <br />' benzene concentrations for the First Quarter - 2003 monitoring event are depicted on Figure 3, <br /> Petroleum Hydrocarbons in Groundwater-March 2003 <br />' CONCLUSIONS AND RECOMMENDATIONS <br /> The highest concentrations of dissolved phase petroleum hydrocarbons appear to be limited to the <br /> immediate vicinity of the former UST excavation area (monitoring wells MW-14, VM-1 and VM-2) <br /> Geocon recommends that the Central Valley Regional Water Quality Control Board (CVRWQCB) <br /> consider the Site for possible low risk closure and regulatory "no further action" status Pending <br /> evaluation by the CVRWQCB, the next quarterly monitoring event is scheduled for June 2003 <br />' if there are any questions concerning the contents of this report, or if Geocon may be of further <br /> service,please contact the undersigned at your convenience <br /> Sincerely, <br /> GEOCON CONSULTANTS,INClei Q� <br /> en , E, CEG `4` ��L "a 01(J3 Rebecca L Silva, REA <br /> >Pr4oManager ti AXP Q�' Project Scientist <br />' RLS JEJ sb �4-OF <br /> (5) Addressee <br /> Attachments Figure 1, Vicinity Map <br /> Figure 2, Groundwater Elevation Map -March 2003 <br /> Figure 3, Petroleum Hydrocarbons in Groundwater- March 2003 <br /> Table 1, Summary of Groundwater Elevation and Analytical Data <br />' Appendix A, Summary of Historical Groundwater Analytical Data <br /> Appendix B, Monitoring Well Sampling Data Sheets <br />' Appendix C, Laboratory Reports and Chain of Custody Records L..96ae <br /> Project No S8475-06-24D -3- Apn]28,2003 <br />