Laserfiche WebLink
Work Plan for Refined Plume Definition and Mana ementofloatin F <br /> g g Product-7500 W 11th St., Tracy, C.4. Page 65 <br /> Total Estimated System Closure Cost $ 7,350 <br /> 9.4.2.7 Advantages and Disadvantages <br /> The key advantages and disadvantages of Technology Pumping B - Pum in of LNAPL from <br /> Extraction Wells into Vacuum Trucks - are summarized below. <br /> Advantages: <br /> • Low Capital Cost <br /> • Moderate System Closure Cost <br /> • Requires no construction on private property. <br /> • It is estimated that a first round of extraction of LNAPL could be <br /> scheduled within 60 days of receipt of authorization to proceed. <br /> • <br /> Provides for optional cost-effective future removal of moderate to large <br /> quantities of contaminated groundwater. <br /> Disadvantages: <br /> • High Operating Cost <br /> • Extraction well diameters are at least one order of magnitude less than the <br /> site-specific minimum elementary volume; thus well not reliably intersect <br /> inflow of LNAPL from permeable zones at all scales and from a wide <br /> area. <br /> • Full cut-off of pathways for down-gradient migration of LNAPL cannot be <br /> assured <br /> • Zone of influence induced around wells when LNAPL is extracted is <br /> likely to be relatively small. <br /> • Subsurface conditions and inflow of floating product not observable in <br /> wells. <br /> • Fixed re-determination of well locations does not permit (except to a <br /> p p � p <br /> minimal degree) application of the Observational Method to situate <br /> ` LNAPL extraction point at optimal locations based on actual subsurface <br /> conditions. <br /> sic <br /> t. <br />