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� W <br />' N <br /> tr as <br /> 10 January 2006 <br /> AGE-NC Project No. 97-0360 <br /> Page 3 of 4 <br /> in Table 2. The laboratory report (CTEL Project No. CT214-0506223), quality assurance/quality <br /> control (QA/QC) report, and chain of custody form are included in Appendix C. Documents <br /> confirming the upload of laboratory electronic deliverable format (EDF) files and depth to water <br /> measurements to GeoTracker are included in Appendix D. <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on data collected from the site this quarter, AGE concludes: <br /> t Ground water flow direction at the site on 24 June 2005 was inferred to be flowing toward <br /> the southeast, at a gradient of approximately 0.003 ft/ft. The gradient this quarter is similar <br /> `-' to those measured in previous quarters but the flow direction is inconsistent with previous <br /> monitoring events.However,the gradient is so shallow that slight variations in ground water <br /> F? <br /> elevation can cause significant changes in the ground water flow direction. <br /> TPH-g and TPH-d concentrations in well EW-1 remain non-detect this quarter. No other <br /> hydrocarbon compounds or fuel oxygenates were detected in well EW-1 this quarter,or have <br /> been since ground water monitoring began.(Table 2). <br /> • No analytes were detected at or above laboratory reporting limits in the ground water samples <br /> :., collected from wells MW-1 through MW-5 this quarter. F <br /> f The lateral extent of petroleum hydrocarbon-impacted ground water has been defined to the f= <br /> north by well MW-4, to the south by well MW-5, and to the west by well MW-3. <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted in this report,AGE recommends: <br /> • Continuation of quarterly monitoring events as directed by the San Joaquin County15 <br /> Environmental Health Department(SJCEHD)by letter dated 22 June 2004;the third quarter <br /> monitoring event for 2005 took place on 01 September 2005. <br /> • Preparation of a work plan as required by the SJCEHD in the letter of.response to the <br /> AGE-prepared Closure Summary Report,dated 27 January 2004. The work plan is required <br /> to delineate vertical and lateral soil contamination southwest, east and south of the former <br /> UST. Ground water is required to be delineated east of the former UST. j <br /> Advanced GeoEnvironmental,Inc. <br /> 6� <br />