Laserfiche WebLink
1 f <br />' 15 June 2005 <br /> AGE-NC Project No 95-0128 <br />' Page 3 of 4 <br />' 3 2 ANALYTICAL RESULTS OF MONITORING WELL GROUND WATER SAMPLES <br /> TPH-g and TPH-d were only detected in ground water sample from vapor well VW-1 at <br /> concentrations of 800 micrograms per liter (µg/1) and 3,400 µg/l, respectively BTEX compounds <br /> were detected in sample VW-1 at concentrations of 8 6 µg/1 toluene, 11 µg/1 ethylbenzene and 32 <br /> µg/1 total xylenes MTBE and benzene were not detected in ground water samples No additional <br />' target analytes were detected at or above laboratory reporting limits in the samples analyzed The <br /> analytical results are summarized in Tables 2 and 3 The laboratory report (CTEL Protect No <br /> CT214-0504189), including quality assurance/quality control(QA/QC)and chain of custody forms <br /> for the quarterly morutonng event are included in Appendix C Documents confirming the upload <br /> of laboratory electronic deliverable format (EDF) files and depth to water measurements to <br /> GeoTracker are included in Appendix D <br /> 1 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The followingconclusions were drawn from the results of this quarterly investigation <br /> q y g <br />' Ground water elevations measured during the April 2005 monitoring event ranged between <br /> 20 90 feet to 23 02 feet below MSL The depth to ground water increased over the quarter <br />' an average of approximately 2 6 feet Additional impacted soil is currently exposed to the <br /> ground water table when compared to the first quarter of 2005 The site ground water flow <br /> direction was inferred to be east-northeast towards off-site <br /> • TPH-g and TPH-d were only detected in ground water sample from vapor well VW-1 at the <br /> former dispenser release area BTEX compounds were detected only in sample VW-1 <br />' 0 MTBE was not detected in ground water samples for the first time <br /> • The lateral and vertical extent of dissolved hydrocarbons and MTBE is defined <br /> 5.0. RECOMMENDATIONS <br /> Based on the results of this and previous investigations, AGE recommends <br /> • Continued ground water monitoring of the site The next monitoring event is tentatively <br /> scheduled for July 2005 <br /> • Continued on site remediation of the soil and ground water,utilizing carbon based treatment <br /> from the extraction wells <br /> Advanced GeoEnvironmente[,Inc <br />