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Page 1 of 4 <br /> Mike Infurna [EH]. <br /> From: Scott Ranalli [SRanalli@deltaenv.com] <br /> Sent: Thursday, May 08, 2008 9:10'AM <br /> To: Mike Infurna [EH] j <br /> Cc: Eric Muehlberger <br /> Subject: FW: Formet Canteen site <br /> Importance:-High <br /> Hello Mike, <br /> I am forwarding a recent e-mail exchange between you and Eric (see below). No doubt that <br /> we have "old man memory" x 3 at work here, so it's'good that we have these written copies of <br /> what we say to help refresh... <br /> The-i.m.p.ression I get from your responses below is that you wanted a discussion of,whherre e7 <br /> were,at and where weneed to go. I believe we covered tllat very well in our Workplan' At <br /> this juncture,o plan-is todelineate in a few areas,especially-at'deeper(to 85 feet bgs) <br /> intervals, to help decide our next step: <br /> Sail Bonn' .9_Es: O_u.r SVE concentrations continue to ,get lower and are currently at less than 2 j <br /> � <br /> ppmv. To confirm that soil-i`;'clean�an.d/or two find any depths where residual sorbed-phase <br /> HCs are present, we h va ehproposed,two soil borings. One is near the MW-3 wells (south end <br /> of site) and one is near the MW-13 wells (former tank field). <br /> k <br /> Monitor Wells: As is stands, the deeper completion wells seem to have the highest <br /> remaining HC concentrations. Weare currently leaning towards augmenting the existing AS- <br /> SVE System with deeper AS,wells to 85 feet. Based upon the CAP and pilot testing, the <br /> current AS.wells were only installed to 60-ft bgs. There may be two factors at play here: <br /> 1. The 60-ft AS wells may have pushed HC concentrations deeper. <br /> 2. The preferential reduction of toluene and xylenes concentrations (as opposed to <br /> benzene) indicates depleted 02 in the deeper GW. . <br /> Each new MW area will have one medium well to 65 feet bgs and one deeper well to 85 feet <br /> bgs. We want to look at'two areas: <br /> I. [The area between,the..MW-3,,and..MW-- 3 series welIs.has.-never_been_sampled..j We want <br /> to confirm whether or not there are residual HCs in this area which are feeding the <br /> continuing concentrations in the MW-3 wells. In addition, these wells may be utilized as <br /> AS or injection wells, as necessary. <br /> 2. The area on-the other side (down-gradient) of the Lane Masters property. We need to <br /> gauge whether or not there are oxygenates down-gradient of well MW-11 {which is in <br /> the north end of Lane Master's). I understand that this was.actually your request to Eric <br /> at some point. <br /> As I said, we are�leariing'towards-adding deep.,AS to the existing_sy_stem,�.though oxidants or <br /> 5/8/2008 <br />