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Page I of 2 <br /> Mike Infurna [EH] <br /> From: Mike Vlach [mviach@surewest.net] <br /> Sent: Tuesday, September 16, 2008 3:59 PM <br /> To: Mike Infurna [EH] <br /> Subject: Re: Oliveras prop <br /> Mike- Castle labs has said similar things about MTBE breaking down in to TBA from heat in certain brands of test <br /> equipment, but nothing about acid. I will talk to Clarie. TBA is what is breaking through first on the carbon filters. <br /> I am testing a new set up with this fourth set of filters. TBA is an alcohol, you make alcohol in an oxygen deprived <br /> environment. I am running my 1/4" bleed water ports wide open and sprinkling the water into the recycle barrel in <br /> an attempt to introduce oxygen into the filters. Typically the first filter will break through with TBA after two <br /> weeks. I have to wait to get the fourth week of data for this forth set of filters, it has been clean for the first three <br /> weeks. The lower concentrations at EW-1 can also be why the run time is encouraging. <br /> -Mike Vlach <br /> ----- Original Message <br /> From: Mike Infurna [EH] <br /> To: Mike'Vlach <br /> Sent: Tuesday, September 16, 2008 2:16 PM <br /> Subject: Oliveras prop <br /> Mike, <br /> I got a chance to look at the lastest QMR on Geotracker for this site, 300 S. <br /> California. <br /> I'm concerned with the TBA and it's 'spotted' history at this site. <br /> I've read some literature that suggests sites with MtBE have been showing TBA <br /> in the gw samples from 'hydrolosis' in the VOA. sort of a 'lab induced' error, but <br /> this one occurs IN the VOA..... <br /> the paper suggest the presence of MtBE in a strong acid (1 .0 to 2.0 pH) <br /> transforms to TBA inside the VOA... <br /> as a check, they recommend either NO preservative or TSP in another sample run <br /> as a blank or even a dup. <br /> high percentages of non-HCI preserved samples were negative for TBA on sites <br /> with MtBE ... <br /> just a thought. <br /> Michael J. Infurna Jr. <br /> Senior RENS. CA Reg#5649 <br /> LOP/Site Mitigation Unit IV <br /> San Joaquin County Environmental <br /> Health Department(SJCEHD) <br /> 600 E. Main Street <br /> 9/16/2008 <br />