From: KENT Mavis D
Sent: Mon Dec 10 09:12:58 2007
To: 'Chris Kimmel'
Cc: Chaput, Kenneth G; Sarah Prowell
Subject: RE: Additional evaluation at BOP-22
Importance: Normal
Thanks for letting me know about this upcoming work. I think this would be a good step toward understanding the concentrations in BOP-22 which as you know has been of concern to me for quite some time. I would like to know when you would be conducting the work in case I am able to come out to the site and see how the work is going.
I am not sure whether you meant part of the Boeing or the EMC ongoing remedy design. If it is EMC then I would expect to see results in quarterly and then the annual reports. If you meant the Boeing, then I would expect the same thing but the reports would need to include information that hasn't been included in the past to allow a stand alone view of the information. Unless, you intend to provide a separate report, which would be acceptable to me.
Mavis D. Kent
Cleanup & Emergency Response Section
DEQ Northwest Region - East Side Office
1550 NW Eastman Parkway, Suite 290
Gresham, Oregon 97030
503-667-8414 X55008
503-674-5148 Fax
kent.mavis.d@deq.state.or.us
-----Original Message-----
From: Chris Kimmel [mailto:CKimmel@landauinc.com]
Sent: Wednesday, December 05, 2007 5:07 PM
To: KENT Mavis D
Cc: Chaput, Kenneth G; Sarah Prowell
Subject: Additional evaluation at BOP-22
Mavis,
During the past few months, the remedaition team has been conducting several evaluations to interpret the elevated TCE concentrations observed at BOP-22(ds). By using historical data for the TGA, Upper TSA, and Lower TSA we have been evaluating vertical gradients, signature footprints for chemicals of concern, groundwater flow modeling, and we have been approved to conduct vertical profiling at BOP-22 and EW-22 using diffusion bags to better understand vertical flow patterns. The preliminary results of the evaluations have been useful; however, we think a few more tests may be needed to fill data gaps and hopefully lead us to an action plan for addressing the continued elevated concentrations observed at BOP-22(ds). In an effort to keep everyone involved, we would like to notify you that we will be conducting the following tests. These types of tests are typically considered O&M measures and will be conducted as part of our ongoing remedy design.
We will run some diagnostic checks on the well structure and well construction integrity for BOP-22(ds). Diagnostic checks will consist of a down-hole video scan and potentially a geophysical survey of the annulus seal and nearby formation structure. The purpose of running the diagnostic checks on the well integrity would be to determine if the well is damaged and possibly allowing the migration of the TGA to the TSA.
Historical data indicates the TGA and the TSA have significantly different anion characteristics; therefore we will be collecting groundwater samples from BOP-7(i), BOP-22(ds,dg), and BOP-43(ds,dg) for major anion analyses using Method 300. The purpose of conducting this type of test is to evaluate the possible downward migration of the TGA to the TSA at BOP-22. We will be collecting the samples during the vertical profiling and shutdown of EW-22 (between 12/7 and 12/21).
These tests are another tool to assist with the development of a remedy for the Upper TSA along the western portion of the project. Any additional thoughts you have on the approach would be greatly appreciated.
Thank you,
Christine Kimmel, LG ¨ Senior Project Geologist
Landau Associates, Inc.
130 2nd Ave. S, Edmonds, WA 98020
main 425.778.0907 ¨ direct 425.329.0254 ¨ cell 206.786.3601
ckimmel@landauinc.com ¨ www.landauinc.com
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