ARCHIVED REPORTS_XR0012418 (2) - Laserfiche WebLink

Home Browse Search

1 , 15 November 2005 • AGE-NC Project No 02-0926 Page 3 of 4 wells MW-1 and MW-3 at concentrations of 11 µg/1 and 93 µg/l,respectively A concentration map ' depicting the approximate distribution of dissolved 1,2-DCA is depicted on Figure 4 No other target analytes were detected at or above laboratory detection limits in the ground water samples analyzed ' Analytical results of ground water samples are summarized in Table 2 The laboratory report(CTEL Project No CT214-0507144), quality assurance/quality control (QA/QC) report, and chain of ' custody forms are included in Appendix C Documents confirming the upload of laboratory electronic deliverable format (EDF) files and depth to water measurements to GeoTracker are included in Appendix D 4.0. SUMMARY AND CONCLUSIONS Based on data collected at the site, AGE concludes • Depth to ground water at the site averaged approximately 41 55 feet bsg on 22 July 2005 • Ground water elevation in the monitored area ranged from 22 09 feet to 23 34 feet below ' . MSL Flow direction was inferred to be toward the north under a gradient of approximately 0 018 ft/ft • TPH-g and BTEX were detected in the ground water sample collected from monitoring well ' MW-3 at concentrations of 270 micrograms per liter (µg/]), 10 µg/1 benzene, 3 2 µg/l toluene,3 7 µg/1 ethylbenzene, 112 µg/1 xylenes 1,2-DCA was detected in the ground water samples collected from wells MW-1 and MW-3 at concentrations of 11 µgd and 93 µg/1, respectively 5.0. RECOMMENDATIONS Based on the findings recounted in this report, AGE recommends • Continuation of quarterly ground water monitoring events,the fourth quarter 2005 sampling event was performed in October 2005, the first-quarter 2006 event will be scheduled for February 2006 ' Installation of a shallow ground water monitoring well within the former UST location to demonstrate the contaminate concentration trend at the petroleum release Advanced GeoEnvironmental,Inc � 1