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1 <br /> 4.4.2 Cost Analysis <br /> Costs for implementing a DPE system are highly variable and depend on site-specific factors including site <br />' soil characteristics,nature and extent of the contaminant plume,and vapor and liquid treatment and <br /> discharge requirements <br />' Table 4-1P resents cost data available for these four case studies Figure 4-4 relates the cost per pound of <br />' contaminant removed and cost per gallon of groundwater removed/treated for Case Study 1 <br /> 4.5 VENDORS <br /> DPE systems are often similar to SVE systems in construction and operation,and do not generally employ <br /> ' uniquely developed and manufactured equipment items(beyond patented items such as self-priming drop <br /> tubes) Further, consultants without patents related to DPE can design,install, and operate DPE systems <br /> ' contingent upon payment of applicable licensing fees or royalties Therefore, in addition to patent holders, <br /> DPE vendors include companies with experience in design,installation,and operation of DPE systems <br /> '. Table 4-2 presents a list of such vendors, including identified patent holders who were contacted during <br /> preparation of this report <br /> 46 STRENGTHS AND LIMITATIONS <br /> The following list outlines the primary strengths of DPE for remediation of sites contaminated with VOCs <br /> ' Increases water extraction rates in low permeability settings <br /> • Increases the vapor extraction zone of influence <br /> • Addresses smear zone and saturated soil contamination <br /> • Enhances removal of free-phase and residual NAPL <br /> ' Potentially reduces ex situ groundwater treatment by in-well stripping in entramment extraction <br /> wells <br /> ' Potentially eliminates the need for downhole pumps and associated controls and instrumentation <br /> through the use of entramment extraction <br /> • 4-19 <br /> 1 <br />