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22 October 2004,. <br /> i AGE-NC Project No. 95-0106 <br /> Page 3 of 4 <br /> 'MW-S, MW'-6 (upper), MW-6 (lower), or MW-7. Analytical results ofground,water san!iples are <br /> summarized in Table 2: The,laboratory report (CTEL Project No: CT214-0406227); quality <br /> assurance/quality control(QA/QC)reports and-chain of custody forms are included in Appendix_C. <br /> `;Documents conf rmirig the upload of laboratoryelectronic deliverable'format(EDF)files and depth <br /> to water measurements to GeoTracker are included in Appendix D. <br /> 4.0.,.. SUMMARY AND CONCLUSIONS <br /> The following;conclusions were drawn from the results of the,<site investigation: <br /> • ` ' 'The ground water flow direction was generally northward on 23 June 2004',:at an average. <br /> gradient of 0.007 foot/foot. Ground water elevations decreased slightly but continue to flow <br /> in a northerly direction. <br /> • TPH-g was"detected in ground water samples from monitoring well MW-4,'located down- <br />' gradient off site from the former UST excavation, and in well MW-1 located just north of <br /> the former UST area: <br /> 1 BTEX compounds were detected in the water samples collected from MW-1 and MW=4. The <br /> concentrations of benzene in the ground,water samples collected from wells MWS l and <br /> MW-4'exceeds'the State of California maximum-contaminant level-(MCL) for'drinking <br />' water. <br /> • MTBE was not detected in the•water samples collected from the site -for the second <br /> consecutive;quarter. .'. <br /> 1,2-DCA was not'detected this quarter in the ground water samples collected. <br /> 5:0. RECOMMENDATIONS : s <br /> Based on this.and previous site irivestigations;-,AGE•recommends cont'inued.quarterly monitoring <br /> of the well;rietwork' The third quarter monitoring event was performed in September 2004. <br /> 6.0. '', LIMITATIONS. <br /> Our professional services were performed using thatdegree of care and skill ordinarily'exercised by , <br /> environm6i-ital"'consultant's practicing in this 'or similar.localities: 'The findings'were based upon <br /> ,analytical- results provided 'by an independent laboratory. Evaluations ;of the'.hydrogeologic <br /> conditions at the site for• the purpose of this, investigation are made' from a limited'number of <br /> Advanced GeoEnvlronmental, Inc. <br />