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30 September 2013 <br />AGE Project No. 99-0559 <br />Page 4 of 5 <br />TPH-g were detected in the effluent of the air stripper during the June 2013 sampling <br />event; no other analytes were detected in the effluent of the air stripper during the second <br />quarter 2013. Petroleum (BTEX) and fuel additives were not detected at the effluent <br />samples collected during the quarter. <br />Analytical results of pump-and-treat influent and effluent water samples are summarized <br />in Tables 1 and 2. <br />CTEL laboratory reports (CTEL Project Nos. 1304134, 1305114, 1306146) with quality <br />assurance/quality control (QA/QC) reports and chain-of-custody forms, are included in <br />Appendix B. GeoTracker confirmation numbers of the submitted laboratory electronic <br />deliverable format (EDF) files are 7502814590, 7843568325, and 9919864714. <br />2.5. MASS-VOLUME REMOVAL CALCULATIONS <br />Between 19 March 2013 and 21 June 2013, the groundwater extraction system recovered <br />an estimated total of 97.1 lbs of TPH-g, 8.4 lbs of benzene and 3.5 lbs of MTBE. <br />Since May 2003 a total of 13,542.1 lbs of TPH-g, 776 lbs of benzene and 1,318.2 lbs of <br />MTBE have been extracted from groundwater. The volumetric calculations from the <br />groundwater pump-and-treat system are presented in Appendix C. <br />3.0. SUMMARY AND CONCLUSIONS <br />Based on data collected during the monitoring event, AGE concludes: <br />Between March 2013 and June 2013, the highest concentrations of petroleum <br />hydrocarbons were detected in extracted groundwater from wells EW-1 and EW-2, <br />surrounding the former UST area and dispensers. <br />MTBE concentrations in extracted groundwater continue to decrease, after <br />decreasing significantly in 2012, with the exception of EW-2; MTBE concentrations <br />increased during the second quarter 2013 in influent samples collected from EW-2. <br />The overall removal of contamination since the initiation of the groundwater <br />extraction/treatment system in May 2003 is 13,542.1 lbs of TPH-g, 776 lbs of <br />benzene and 1,318.2 lbs of MTBE. <br />Remediation equipment additions have significantly reduced the wastewater stream <br />overall and discharge of petroleum to GAC media appears to be stable. <br />Advanced GeoEnvironmental, Inc.