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�4 l <br /> i Memorandum <br />" lid <br /> it <br /> 5.. Other potential existing sources of FHC's and particularly MTBE may include but are not limited to kMk <br /> surface spills which may enter joints and fractures in surface finishes (concrete & asphalt) and f <br /> leaking surface water oil/grease separators, drains and conveyances. <br /> 6. Ground water samples from monitoring wells were observed to have moderate to strong <br /> ether/oxygenate odors most notable in MW#2. No standard/typical FHC odor, floating product or <br /> sheen were observed, however, extremely small translucent droplets of an unidentified substance <br /> (MTBE?) were observed on the surface of bailer samples placed in observation dishes from MW <br /> #2. It is possible that our approach to visual and olfactory observations during sampling events j <br /> may need to be modified as a result of fuel reformulation/oxygenates like MTBE, TAME,EIDE and <br /> alcohol blends. In accordance it is also possible that soil sampling and groundwater sampling <br /> approaches may need to be modified to better assess contaminant distribution, migration and risk <br /> assessment <br /> P <br /> 7. Additional monitoring wells° will be required to further delineate the vertical and lateral plume <br /> boundaries. Unocal has been contacted and have been directed to immediately submit a workplan rE <br /> with boring permits to PHS/EHD to address the undefined plume (written format to follow this <br /> memo). As the analytical results from the third quarter monitoring event are received and reviewed <br /> further work on MTBE correlations at this site and others will continue to receive appropriate priority <br /> until directed otherwise. a f <br /> RWR <br /> Attachments ' <br /> CIf <br /> �I <br /> i• 'i <br /> Ili <br /> ! <br /> ii <br /> A d'! <br /> 2 � � <br />