2007-11-20_REVISION - M1982015 ‎(19)‎

• Permit No: M1982015
• IBM Index Class Name: REVISION
• Doc Date: 11/20/2007
• Doc Name: Appendix 1, Email Correspondence
• From: E-21 Engineering, Inc.
• To: DRMS
• Type & Sequence: TR3
• Media Type: D
• Archive: No

Page 1 of 3
BRIAN WOODY
From: "Teresa J Bennett" <[e-mail]>
To: ,Sergius Hanson" <[e-mail]>
Cc: <[e-mail]>; Brian Woody <[e-mail]>; Norm Higley
<[e-mail]>; "Teresa J Bennett" <[e-mail]>; Chris
Morley -- Vertex"' <[e-mail]>; "Don D'Amato - Vertex"
<[e-mail]>; "'Warren Maierhofer -- Vertex<[e-mail]>
Sent: Monday, February 12, 2007 10:50 AM
Subject: Re: Request to Proceed with Cleanup and TCLP & BTEX ProfileResults for SHT
Hi Serge,
Based on the information in your email, I concur with removal of the
material in the SHT as solid waste. I have no lab reports, so I assume
all holding times and other QA/QC were met, and samples were
representative for waste characterization. Also, I have the following
comments:
1. I assume you added more cement and mixed it in prior to taking the
2/3/07 samples, and thus the logical reason why these samples passed
TCLP and the ones taken in early Jan. did not. If so, please update
your table for the yards of cement added to the trench for the Feb.
samples. Also, please specify the approximate sample depths.
2. After you have removed all the solid waste from the SHT and
following any over-excavation, as for the western trench, discrete
confirmation soil samples should be taken every 50 feet from along each
sidewall and from along the bottom, and at the two ends. These samples
should be analyzed for BTEX 8020. You do not need to analyze these for
TCLP, as they are for remediation confirmation and not waste
characterization. The only time you need to run TCLP again might be if
you run into some really "hot" trench material when excavating and you
want to segregate this and recharacterize for disposal to be sure.
3. It does not sound like you will excavate below the water table. If
you were to get into saturated soils while excavating, then any
groundwater that may be contaminated above State groundwater standards
would need to be contained and not allowed to run and drain onto the
ground surface.
For the western trench status, it does not surprise me that the
contaminated soil extends significanlty further beyond the sidewalls,
given the size of this line and the potential release amount. The same
may happen in the SHT, especially closer to the release point. But it
is good to overexcavate and get the worst of it now. Any continuing
source to groundwater would be a much bigger problem down the road.
Thanks for the update, Terry
>>> "Sergius Hanson" <serge@e-2 I engine x ng com> 02/09/07 1:49 PM >>>
Terry,
We received the TCLP and waste characterization results for the 8
6/9/2007