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Mr. James Barton <br /> November 2, 2004 <br /> Page 6 <br /> Due to the cost of operating system and the regulatory mandate to cleanup the site in a timely <br /> manner, it is our intention to fully optimize the AS/SVE operation. Future AS/SVE optimization <br /> activities and seasonal fluctuations in groundwater elevation may produce sporadic and <br /> short-term elevated concentrations in wells MW-14 and MW-18D. However, we will monitor all <br /> wells for increasing trends and make system optimization adjustments as required. <br /> The fourth quarter sampling event was completed on October 22, 2004. During this quarterly <br /> sampling event, all monitoring wells were sampled. Draft copies of the analytical results will be <br /> submitted to the RWQCB for review within prior to November 15, 2004. The results of this <br /> sampling event will be evaluated to assess increasing or decreasing trends in Unit B. <br /> Remarks/Signatures <br /> The interpretations contained in this work plan represent our professional opinions, and are <br /> based in part, on information supplied by the client. These opinions are based on currently <br /> available information and are arrived at in accordance with currently accepted hydrogeological <br /> and engineering practices at this time and location. Other than this, no warranty is implied or <br /> intended. <br /> If you have any questions regarding this project, please contact Ben Heningburg at <br /> (916) 288-4315. <br /> Sincerely, <br /> ENSR Corporation <br /> Benjamin I. Heningburg Mark Capps, R.G. #6561 <br /> Senior Project Manager Senior Project Manager <br /> BH/mr <br /> Ref. 06940-293-120 <br /> Attachments <br /> cc: Mr. John Frary, Union Oil Company of California <br /> Mr. Mike Infurna, San Joaquin County - Environmental Health Department <br /> Ms. Jill Tracy, Esq., Union Oil Company of California <br /> Mr. Jay Allen, Stone Brothers Management Company <br /> Mr. Gary Hall, GHH Engineering, Inc. <br /> J:IProjects10694015098-2931Final\ReportslWork Plans15098 Work Plan-SVE AS System.doc <br />