Laserfiche WebLink
J Jar , <br /> Geological rechaia Inc. Page 12 <br /> Interim Remedial Action Plan <br /> Project No.723.2 <br /> March 7,2005 <br /> 3.2.2 Groundwater Treatment—Air stripping with carbon filtration of vapor effluent <br /> The, extracted groundwater will be treated by a combination of air stripping and carbon <br /> L ` filtration as outlined in section 3.1.2.2 above. <br /> 3.2.3 System Control & Monitoring <br /> r GTI will •perform monitoring of the system to obtain maximum contaminant removal <br /> 6� efficiency and compliance with regulatory permits. This will include: <br /> • Groundwater elevation measurements in site wells; <br /> • Water flow measurements for mass removal calculations; <br /> • Sampling ports on the effluent of the dual phase extraction system, air stripper and <br /> carbon units. <br /> r Water sampling will be conducted as outlined above in Section 3.1.3.2 <br /> 4.0 ASSESSMENT OF REMEDIAL EFFECTIVENESS <br /> 4.1S ource Removal <br /> After the dual phase extraction system is installed and is operating at full capacity, a radius of <br /> influence test will be performed. The radius of influence testing will be performed to ensure <br /> that the extraction is sufficient to affect the entire site. <br /> Vapor concentration and flow rate measurements will be used to determine contaminant <br /> removal rates. GTI will attempt to quantify the amount of residual contamination by <br /> determining the amount of contaminants removed and subtracting from the original estimates <br /> provided in our January 21, 2004 "Additional Site Characterization report. <br /> If the system reaches asymptotic conditions.then it will be placed in pulse mode to allow the <br /> subsurface to equilibrate. A work plan addendum will be prepared for SJC/EHD prior to <br /> placing the system in pulse mode. <br /> 4.2 Deep Aquifer Plume Control <br /> This effort to control the groundwater plume. is both an interim remedial action and an <br /> ongoing pilot test to determine aquifer response to pumping. Until the continuous soil boring <br /> for the new extraction well is, accomplished and the extraction actually begins we do not <br /> know if the 70 feet bgs sand unit is a confined or unconfined zone. <br /> The field data will be analyzed by constructing time-drawdown graphs. The variables used in <br /> the common aquifer testing formula can be obtained from the graphs. The exact equations <br /> that will be used and hence the corresponding graphs_ are not known at this time because it is <br />