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. Mr Jeffrey Wong <br /> Page 3 <br /> SUMMARY <br /> • Groundwater flow radiated from an apparent groundwater mound in the vicinity of well MW 1 <br /> • TPHg, BTEX and 1,2 DCA concentrations were generally similar to those recorded dunng the <br /> previous sampling event <br /> • Concentrations of gasoline oxygenate additives remained at non-detectable levels in all wells <br /> • EDB was not detected in wells MWl through MW4, and 1,2 DCA was not detected in well MW3 <br /> for the third consecutive event <br /> CONCLUSIONS <br /> • Groundwater flow direction at the site continues to exhibit extreme variability This vanability and <br /> the apparent mounding near well MW1 may be a result of the pumping of nearby water supply <br /> wells <br /> • Concentrations of dissolved petroleum hydrocarbons, 1,2 DCA and EDB in groundwater at the <br /> site appear to be stable <br /> • The limits of the dissolved hydrocarbon plume of have not been defined <br /> The next round of groundwater sampling is scheduled for December 2001 PHS/EHD will be <br /> provided with at least 48 hours notice before conducting fieldwork If you have any questions or <br /> comments please contact Ground Zero at your convenience <br /> Respectfully, <br /> Gro d Zero alysis, Inc <br /> W �,��RED Gfpl <br /> Garvey, <br /> Staff Geologist /] GRI=GORY P. <br /> �l STAHL <br /> No 5023 <br /> Gregory P Stahl, RG 5023 <br /> CA Certified Hydrogeologist No 264 �l'�T <br /> �of csLi�a� <br /> Attachments <br /> cc Mr and Mrs John Ferraiolo <br /> Mr Marty Hartzell, CA Regional Water Quality Control Board <br /> Ms Marla Nahorn, Environmental Closures <br /> Harrys%reportslgmr13gm2001 doe <br />