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1 <br /> Groundwater Analytical Results <br /> TPI-Ig was detected in samples collected from wells MW-14, VM-1 and VM-2 at concentrations of <br /> 540, 420 and 12,000 gg/l, respectively TPHd was detected in the groundwater samples collected <br />' from wells MW-9, MW-11, MW-13, MW-14, MW-24, VM-I and VM-2 at concentrations ranging <br /> from 50 (MW-11) to 4,800 (VM-2) gg/l Benzene was detected in groundwater samples collected <br /> from wells MW-14, VM-1 and VM-2 at concentrations of 120, 69 and 5,300 gg/l, respectively <br /> Toluene, ethylbenzene and total xylenes were also detected in wells MW-14, VM-1 and VM-2 at <br /> concentrations ranging from 2 3 (VM-1 - toluene) to 710 (VM-2 -ethylbenzene) gg/l FOCs were not <br /> detected above their respective laboratory method detection limits in each of the groundwater <br /> samples collected TPHg, TPHd and benzene concentrations for the Third Quarter - 2002 monitoring <br /> event are depicted on Figure 3, Petroleum Hydrocarbons in Groundwater- September/October 2002 <br /> CONCLUSIONS ANIS 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 December 2002 <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,IN � jO <br /> cc Q$ <br /> C '� q ebecca L Silva, REA <br /> roj anager ` 00' 3 q Project Scientist <br />' RLS JEJ sb d'>.qT C1V�'�Q <br /> FOl=CAS <br />' (5) Addressee <br /> Attachments Figure 1, Vicinity Map <br /> Figure 2, Groundwater Elevation Map - September 2002 <br /> Figure 3, Petroleum Hydrocarbons in Groundwater- September/October 2002 <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 <br /> Project No S8475-46-24B -3- November 5,2002 <br />