DERR-2024-010560

David Bird <[e-mail]>
Christy Mill On-site discussion
4 messages
David Bird <[e-mail]>Thu, Sep 5, 2024 at 10:26 AM
To: Aaron Langston <[e-mail]>, Reed Soper <[e-mail]>
Cc: Bill Rees <[e-mail]>
Aaron and Reed,
Thank you for facilitating the meeting we had on-site yesterday (9/4/2024) at the Christy Mill Repository. I wanted to
follow up with you about our discussion concerning the path forward.
1. SITLA will have over 300 tons of roadbase material delivered to the site in the next 1-3 weeks for use in restoring the
cover of the Repository and will exceed the design thickness in lower areas to help reduce the potential for erosion in
the future. In addition, rock typically with a diameter of at least 8 inches will also be delivered to the site, and used in
combination with existing rock already on the cover to armor areas of the cover or adjacent to the cover.
2. At the southern boundary of the Repository adjacent to the fenceline, a rock barrier will be built at least 8 inches high to
reduce the slope of the cover at this location and reduce the potential for erosion. This will be in addition to the required
cover thickness of 15 inches above the fabric marker barrier in the original design. Additional filter fabric will be part of
this barrier on the upgradient side of the rock.
3. At the eastern portion of the Repository where erosion has damaged the fabric marker barrier and eroded the
underlying layer of cover material, a vertical layer (wall) of rock will be placed beginning at the current grade (or deeper) in
order to protect the Repository cover from future movement of water in the drainage channel immediately to the east of
the Repository. As the rock wall is built, the Repository cover layers will be restored immediately west of this protective
rock. A fabric layer will also be placed with the rock. The goal of placing this rock will be to prevent future erosion of the
Repository cover at the eastern boundary.
4. SITLA will keep me (DERR) updated on the preparations and schedule for doing the restoration work. DERR may visit
the site and/or SITLA will facetime with the DERR to facilitate the process of observing the construction/restoration of the
Repository cover.
Please let me know if I've misrepresented or missed anything in this brief summary. Thanks a lot for your help on this
project.
Dave
--
David Bird | Project Manager | VCP/Brownfields Section
385-391-8135 (office)
801.359.8853 (fax)
195 North 1950 West, Salt Lake City, UT 84116
Aaron Langston <[e-mail]>Thu, Sep 5, 2024 at 12:45 PM
To: David Bird <[e-mail]>
Cc: Reed Soper <[e-mail]>, Bill Rees <[e-mail]>
David, yes it was great spending time with you yesterday on site. I think your recap is accurate. Please keep in mind I
can't control the contractor bringing in the material, but I think he will have it done within the time frame specified. I will
keep you posted.
Best,
Aaron
[Quoted text hidden]
9/6/24, 2:46 PM State of Utah Mail - Christy Mill On-site discussion
https://mail.google.com/mail/u/0/?ik=9ad96c2360&view=pt&search=all&permthid=thread-a:r6057653174264537525&simpl=msg-a:r-32714810485938…1/2
David Bird <[e-mail]>Thu, Sep 5, 2024 at 1:07 PM
To: Aaron Langston <[e-mail]>
Cc: Reed Soper <[e-mail]>, Bill Rees <[e-mail]>
Aaron,
Thanks for the reply. I realized I forgot to mention the rock check dams to be installed as they seem appropriate on the
surface of the Repository cover after the other items are installed.
Dave
[Quoted text hidden]
Aaron Langston <[e-mail]>Thu, Sep 5, 2024 at 2:23 PM
To: David Bird <[e-mail]>
Cc: Reed Soper <[e-mail]>, Bill Rees <[e-mail]>
Yes, that was certainly part of the discussion.
Thanks,
Aaron
[Quoted text hidden]
9/6/24, 2:46 PM State of Utah Mail - Christy Mill On-site discussion
https://mail.google.com/mail/u/0/?ik=9ad96c2360&view=pt&search=all&permthid=thread-a:r6057653174264537525&simpl=msg-a:r-32714810485938…2/2