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envirometal technologies inc. Memorandum To: Jim Huff chuff@huffnhuff.com) ' From: Mike Duchene, EnviroMetal Technologies Inc. Date: 28 June 2004 Re: Iron Leaching Data—32167.88 As part of the design for permeable reactive barriers that were constructed in the State of California, EnviroMetal Technologies Inc. (ETI) completed bench-scale testing which ' involved pumping groundwater collected from each site through a column packed with granular iron. The granular iron was from the same manufacturer as proposed for injection at the French Camp site (Connelly-GPM). As part of the bench-scale test, samples of the groundwater from the influent and effluent were collected and analyzed for inorganic compounds. Table 1 lists the results for three column studies. These tests are designed to ' simulate in situ conditions. As shown in Table 1, the concentration of most inorganic compounds decreases as the groundwater flows through the column of granular iron due to precipitation reactions that occur in the granular iron. For these studies, it was concluded that any precipitates that 1 formed in the granular iron would not have a long-term negative effect on system hydraulics. The only compounds that increased in concentration were iron and, at one site, manganese. Dissolved iron is produced from the corrosion of the granular iron. The granular iron contains a small fraction of manganese (typically less than 0.5%), and depending on the geochemistry of the groundwater, may leach from the granular iron over the short term. As the groundwater flows from the granular iron zone, the geochemistry of the groundwater will return to background levels. Both of these metals should precipitate in the aquifer sediments under typical aquifer conditions. 745 Bridge Street West, Suite 7 Waterloo, Ontario Canada N2V 2G6 ' Tel 519.746.2204 Fax 519.746.2209 Web page:www.eti.ca