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3rd Quarter Report - Beacon Station #695 3 December 1992 <br /> a <br /> The results indicated a flow increase of about 30 scfm (+14X) over the 9 <br /> September readings. This improvement was realized even with a filter <br /> present on the system. Given the favorable results, an October date was <br /> set for removing the second restriction. This would require some <br /> underground construction work. <br /> 22 September 1992 Monitoring- <br /> The system operated continuously since the 21 September servicing. <br /> Concentrations continued to decline at the individual extraction points. <br /> The area of high concentrations (10,000+ ppm) between the diesel and <br /> gasoline pump islands shrank further and no longer included MW-27. The <br /> outer plume boundary (area <100 ppm) also shrank and appeared to be <br /> largely confined to the site except along Cherokee Lane. <br /> The concentration at MW-3 (4 to 20' below grade screened interval) <br /> decreased to 6,000 ppm while concentrations at nearby MW-10 (41 - 71' <br /> below grade screened interval ) remained high, suggesting that the <br /> residual plume was primarily resident in the deeper soils. <br /> Wells MW-9 and MW-16 were closed due to low concentrations. This raised <br /> . the system influent to over 3,000 ppm and the extraction rate to over 260 <br /> lbs/day. Even with the closure of these wells, the air flowrate from the <br /> soil was still over 20 scfm higher than the maximum flowrate achieved <br /> prior to removal of the first restrictive connection. It was hoped that <br /> a similar improvement might occur when the second restriction was <br /> scheduled to be removed. <br /> Please feel free to call if you have any questions or comments. <br /> Sincerely, � �I p�me <br /> 0 � <br /> EVAX Technologies, Inc. '=`� �� �� s <br /> ' No 03 41 U') <br /> Exp <br /> Robert A Nunes, REA ► <br /> Project Engineer p'e'r �4�¢ <br /> Attachments: 1) Site Plan <br /> 2) Formula for Calculating Mass Removal <br /> Appendices: A) Appendix A: Table I-Extraction Well/Probe Summary <br /> " ": Table II-Incinerator System and TVH Summary <br /> it Table III-Benzene Summary <br /> Appendix B. Laboratory Reports <br /> -6- <br />