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Mr Dann Rouse <br /> Exxon Company,U S A <br /> December 14, 1999 <br /> Page 2 <br /> The SVE system was shut down from February 5 to March 26, 1998 for replacement of the activated <br /> ' carbon and to determine whether a rebound in extracted petroleum hydrocarbon concentrations would <br /> occur upon system restart The SVE system was sampled on March 30, 1998, three days after restart <br /> As can be seen in Table 3, the sample of extracted soil vapor had non-detectable concentrations of <br /> ' TPPH as gasoline and BTEX These results suggest that the SVE system has effectively removed the <br /> volatile petroleum hydrocarbons from the vadose zone The system operation was discontinued on <br /> April 10, 1998 A graph illustrating total hydrocarbons removed and influent concentrations over time <br /> ' is included as Enclosure D <br /> Future Work <br /> ' The next quarterly ground water monitoring and sampling is scheduled for January 2000 <br /> Remarks/Signatures <br /> ' The interpretations contained in this report represent our professional opinions, and are based in part on <br /> information supplied by the client These opinions are based on currently available information and are <br /> ' <br /> arrived at in accordance with currently accepted hydrogeologic and engineering practices at this time <br /> and location Other than this,no warranty is implied or intended <br /> We recommend that copies of this report be forwarded to <br /> Mr Michael Infurna Ms Patricia Anderson <br /> ' San Joaquin County California Regional Water Quality Control Board, <br /> Public Health Services Central Valley Region <br /> 304 East Weber Avenue,Fourth Floor 3443 Routier Road, Suite A <br /> ' Stockton,CA 95201 Sacramento, CA 95827-3098 <br /> If you have any questions regarding this project,please contact Jim Brownell at(916) 638-2765 <br /> ' Sincerely, <br /> DELTA ENVIRO T ONSULTANTS,INC ' <br /> GEp4O <br /> �`� p� BROy�, Cid, <br /> Jamin I Henin rg �. -{(;, N� <br /> ' Staff Geologist �q <br /> L'C'LNo 5078 <br /> ' <br /> ramesrownell,R G )(P 8131100 <br /> nagere Registered Geologist Na 5078 1''�T <br /> g g \f OF CNO� <br /> BIH(Lrp005 865) <br /> ' Enclosures <br />