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r � <br /> 10 February 2009 <br /> AGE-NC Project No. 95-0173 <br /> Page 8 of 8 <br /> 3.3. SOIL VAPOR EXTRACTION REBOUND TEST <br /> Based on the declining SVE influent vapor concentrations observed at the site, AGE is proposing <br /> to. conduct an SVE rebound response test at the site.The SVEun <br /> .rebod.response test would be <br /> following advancement of confirmation soil boring <br /> perfoYrmeds B-11,B=12 and B-13. The rebound <br /> iresponse test would consist of restarting all SVE and 1AS operations at the site'for 24-ti-ours(1 day); <br /> during the rebound response test, depth to ground water measurements will be collected at the site <br /> (i.e. wells MW-1, MW-2,MW-3 and MW-4) to monitor ground water fluctuation. <br /> At the conclusion of the 24 hour period, AGE will collect vapor samples utilizing tedlar bags and <br /> an electric vacuum pump from the well-heads of VW-1 through VW-7 new wells and submit each <br /> sample for laboratory analysis of constituents listed in Section 2.2. Following SVE vapor sample <br /> collection, SVE operations will be suspended at the site; SVE operations at the site will remain <br /> suspendeduntil further notification is given byAGE to the EHD,or until the EHD directs otherwise. <br /> Following AGE's review of the rebound vapor samples,AGE will make further recommendations <br /> to the EHD. <br /> Advanced GeoEnvironmental,Inc. <br />