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1 ' 12 December 2005 . AGE-NC Project No. 95-0137 Page 3 of 4 1 TPH-d were detected in wells MW-1 and MW-4 at concentrations of 10,000 micrograms per liter ' (µg/l)•and 12,000 }tg/l, respectively. TPH-d was also detected in the sample from off-site well MW-6 at a concentration of 68,000 pg/I. TPH-g, BTEX compounds were not detected in the ground water samples from theo�s to ells at Ripon Farm Service . The fuel additive MTBE was detected in monitoring well MW-8 (off- site) at a concentration of 180 µg/1. Wnd 'TVA'PsfiC,►►v WCO Aho"{n W06 1r180.,V..l�'` The lead scavenger 1,2-DCA was the detected in the samples from well MW-4,the off-site well MW-9 at concentrations of 20 µg/l and 10 pg/l, respectively. The analytical results are summarized in Tables 2 and 3. A copy of the laboratory report (CTEL ' Project Number CT214-0508117), quality assurance/quality control (QA/QC) report, and chain . of custody form are included in Appendix C. ' 3.3: GEOTRACKER CONFIRMATIONS 1 • Documents confirming the upload of soil and ground water laboratory reports in electronic deliverable format(EDF) files and depth to water measurements to GeoTracker are included in Appendix D. 4.0. SUMMARY AND CONCLUSIONS Based on the data collected from the site, AGE finds: ' The ground water depth decreased 0.9 feet between the third and second 2005 quarterly ground water monitoring events. The ground water flow direction was inferred to be west ' to northwest at a low hydraulic gradient west of well MW-1 and the former UST release area. • Dissolved petroleum hydrocarbon concentrations on-site and directly down-gradient of ithe former UST area, were below detection limits in Third quarter 2005, except for TPH- d. Diesel was not detected in on-site samples for approximately two-annual monitoring cycles, with detections In well MW-4 never greater than 1,000 micrograms per liter. \ Additionally, the detections of TPH-d did not occur in samples from well MW-2 and MW-3, the former UST location and the prior location of the most significant detections of TPH-d detections. A new source of TPH-d may have discharge near or off the site. ' Advanced GeoEnvironmental,Inc.