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Jeff Wong [EH] <br /> From: Jim Barton Obarton@waterboards.ca.gov] <br /> Sent: Friday, September 16, 2005 2:24 PM <br /> To: wlittle@advgeoenv.com <br /> Cc: Jeff Wong [EH] <br /> Subject: 639 W. Clay St., Stockton <br /> Hi Bill, <br /> Got your phone call yesterday on the status of 639 W. Clay St. , Stockton. You were <br /> wondering if there were comments to the bench scale test that I received on 13 May 2005. <br /> I had a chance to take another look at the 29 April 2005 McCambell Analytical report (Re: <br /> Ozone Experiment Details and Result Discussion) . As I see it, the report rambles a bit, <br /> and has a great deal of uncertainty spoken to address things that should have not happened <br /> during the test (acetone & methyl ethyl ketone formation, problems with lab equipment & <br /> cross-contamination, etc. ) . It does contain recommendations to improve future bench scale <br /> testing. The bottom line is that Cr6+ was produced by ozone injection. The Cr6+ reverted <br /> back (for the most part) to Cr3+ after the test was discontinued. <br /> The report does include general stoichiometry but the reactions are not correlated to the <br /> lab data. What the report lacks are tables to make the data results more readable. In <br /> the future Bill, for a bench scale test, you need to provide a letter report with the lab <br /> report, include data tables, a summary and conclusions section, with recommendations on <br /> how to conduct the pilot study based on the conclusions of this report. <br /> Your next step is to submit a workplan for the pilot study, which summarizes and draws on <br /> the conclusions of the bench scale report, to adequately monitor for petroleum <br /> hydrocarbons and potential impacts to water quality. If you have any additional <br /> questions, feel free to contact me. Thanks. <br /> Jim Barton <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> office (916) 464-4615 <br /> fax (916) 464-4704 <br /> 1 <br />