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09 January 2006 <br /> -J- AGE-NC Proj ect No. 97-0360 <br /> Page 3 of 4 <br /> C' <br /> collected and analyzed this quarter. The analytical results of ground water samples are summarized <br /> in Table 2. The laboratory report (CTEL Project No. CT214-0502070), 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 k <br /> measurements to GeoTracker are included in Appendix D. <br /> 4.0. SUMMARY AND CONCLUSIONS f <br /> Based on data collected from the site this quarter, AGE concludes: <br /> • Ground water flow direction at the site on 10 February 2005 was inferred to be flowing <br /> toward the east,at a gradient of approximately 0.004 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 /> 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 E' <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-i through MW-5 this quarter. <br /> • The lateral extent of petroleum hydrocarbon-impacted ground water has been defined to the <br /> north by well MW-4, to the south by well MW-5,and to the west by well MW-3. F <br /> 1 5.0. RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted in this report,AGE recommends: G <br /> • Continuation of quarterly monitoring events as directed by the San Joaquin County P <br /> Environmental Health Department (SJCEHD) by letter dated 22 June. 2004; the second <br /> quarter monitoring event for 2005 took place on 24 June 2005. <br /> • Preparation of a work plan as required by the SJCEHD in the letter of response to the <br /> j. 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 /> t UST. Ground water is required to be delineated east of the former UST. <br /> r <br /> 1 <br /> i <br /> Advanced GeoEnvlronmental,Inc. <br /> I <br />