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S E C O R - - - - <br /> . Ms Anastasia Duarte-Wilkinson <br /> October 22, 2003 <br /> Page 3 <br /> efficiency results, is Included in Attachment 3 <br /> FORTHCOMING ACTIVITIES <br /> During the fourth quarter of 2003,SECOR will conduct monitoring,sampling and remediation system operation <br /> and maintenance activities The results of these activities will be summarized in a quarterly monitoring reportto <br /> be submitted to you in January 2004 <br /> With concurrence from the San Joaquin County Public Health Services, the remediation system has been <br /> turned off for three months (through the fourth quarter) due to low soil vapor concentrations at the site <br /> Additionally, SECOR will conduct a site conceptual model (SCM) Including confirmation borings to evaluate <br /> remedial effectiveness and determine if the site qualifies for no further action (NFA) if the site meets NFA <br /> requirements, SECOR will submit documentation requesting site closure in California Tri-Regional Board staff <br /> Appendix B format Depending on the results of the SCM, SECOR will restart the remediation system during <br /> the first quarter and collect air samples at the time of startup and 24 hours after startup to evaluate rebound <br /> effect <br /> This report presents our understanding of existing conditions at the subject site The conclusions contained <br /> herein are based on the analytical results and professional judgment,which are in accordance with current <br /> standards of professional practice, no other warranty is expressed or Implied SECOR es no lability for <br /> exploratory borings or data reported by other consultants or contractors GED <br /> C <br /> Sincerely, q �- � 4 <br /> SECOR International Incorporated y <br /> wow <br /> Todd J Brown dn E Bower, R G OF Cp►-�k0� <br /> Associate Geologist Principal Geologist <br /> TJB/JEB kf <br /> Attachments Figure 1 --Site Location Map <br /> Figure 2—Groundwater Elevation Contour Map—July 24, 2003 <br /> Figure 3—Dissolved Hydrocarbon Concentrabon Map—July 24, 2003 <br /> Figure 4--Site Plan Showing Remediation System Wells, Piping, and Treatment System <br /> Table 1 —Groundwater Potentiometnc Elevations <br /> Table 2—Groundwater Sample Analytical Results <br /> Table 3—Groundwater Analytical Results For Fuel Oxygenates <br /> Attachment 1 — Field Data Sheets <br /> Attachment 2— Laboratory Analytical Report <br /> Attachment 3— SVE System Performance Data <br /> cc Mr Harlin Knoll, San Joaquin County Public Health Services <br /> Ms Elizabeth Thayer, California Regional Water Quality Control Board <br /> I Mme OII1LoekefordlQMRs12001-20031Lockeford Q3-03 doo SECOR international Incorporated <br />