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Mr Dann Rouse <br /> Exxon Company,U S A <br /> September 28, 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 ceased 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 October 1999 A report <br /> summarizing soil confirmation borings and hydropunch sampling is currently being prepared for <br /> ' submittal to San Joaquin County Public Services <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 /> 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 Infurria 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, Third 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 /> /JWillia <br /> T E ONMENTAL CONSULTANTS,INC. <br /> ' SPED <br /> Speth 4� C O ' <br /> ' Staff Geologist �R <br /> f� # <br /> o 5078 <br /> James R Brownell,R G P 8131 IOC ! <br /> . Project Manager <br /> California Registered Geologist No 5078 �'4TF OF C N\-,, , <br /> JWS(L.rp003 865) <br /> Enclosures <br />