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VEGETATTVE <br /> REuEDZArtorr PxocEss OFFFxs A>avArrrAczrs ov>;x TxAnrrzorru PUMP-AND-TRF-AT T£currozocros <br /> Eachibit 5 Changes In the Ammonium Contaminant Plume Two Years after <br /> Initiating the TreeMedtation Process <br /> IAMMONIUM 1992/1993 <br /> 400 <br /> feet <br /> --------------- <br /> Source Source 2 <br /> I , <br /> 1992 Area of 1993 Area of <br /> NH4> IGO ppm NH4 l0U ppm <br /> t <br /> f <br /> 0 Boring Location <br /> iMT tees <br /> Groundwater <br />' Flow <br /> assume both phases of the system Fortunately, this situation provides a <br /> unique opportunity to compare the costs of the two systems The estimated <br />' costs provided below were developed based on this experience and are <br /> intended for Illustration purposes only <br /> Pump-and-treat and TreeMediation costs were estimated in round <br />' numbers for a 1-acre site with an aquifer 20 feet deep Costs common to <br /> both approaches were not included, such as meetings with regulators and <br /> laboratory analysis Exhibit 6 gives the items and costs considered for the <br />' pump-and-treat system and the TreeMeditatton system It was assumed <br /> that the pump-and-treat system could function with three pumping wells <br /> and a reverse OSMOSIS system for treatment As Exhibit 6 shows, the <br /> estimated costs for the TreeMedlatlon program are considerably lower than <br /> those for the pump-and-treat system <br /> Obviously, these costs can vary widely depending on speclfc circum- <br /> stances However, when the use of TreeMediation is a viable option, It <br /> should be a more cost-effective approach than pump-and-treat There is <br /> MEDIATION/SUmmEA 1994 349 <br />