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1 <br />' 24 dune 2005 <br /> • AGE-NC Project No 98-0534 <br />' Page 5 of 6 <br /> 3 3 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the ground water samples collected from well MW-4 at a concentration of <br />' 100 micrograms per liter (µg/1) In sample MW-4 <br /> TPH-d and BTEX compounds were not detected in the ground water samples analyzed <br /> MTBE was detected by EPA Method 8260 in the samples from wells MW-3, MW-4, MW-6 and <br /> MW-8 at concentrations ranging between 2 1 µg/1 (MW-8) and 25 µg/l (MW-4) <br /> The ground water samples collected from well MW-9, on two separate events were non-detect for <br /> the chemicals of concern <br /> No other target analytes were detected in the analyzed samples The current and historical ground <br /> water analytical results are summarized in Table 2 The laboratory report(CTEL Project No CT214- <br /> 0502002, 0502116 and 0504034), chain of custody forms and the laboratory quality <br /> assurance/quality control (QA/QC) reports are included in Appendix C GeoTracker confirmation <br /> pages of the submitted laboratory electronic deliverable format (EDF) files are included in <br />' • Appendix D <br />' 4.0. SUMMARY AND CONCLUSIONS <br />' The implications from the first quarter 2005 ground water monitoring events are as follows <br /> • The potentiometnc surface was inferred to be flowing southeast towards well MW-1 and <br /> locally to well MW-4 north of the former UST area,represented by a northeast-trending ridge <br /> at the former UST area <br /> • TPH-g concentrations decreased In well MW-4, while the TPH-g was limited to the area <br /> Inorth of the former UST area(MW-4) <br /> • MTBE was detected in four monitoring wells, with the highest dissolved concentration <br />' occurring in well MW-4, north of the former UST area, at a concentration of 25 µg/1 An <br /> MTBE iso-concentration map is illustrated on Figure 5 Dissolved MTBE in shallow ground <br /> water appeared to be delineated by the well network MTBE was not detected in two <br /> consecutive sampling events from well MW-9,screened at 65 feet bsg Dissolved MTBE in <br /> ground water appeared to be delineated by the well network <br /> • <br />' Advanced GeoEnvironmentsl,Inc <br />