From:                                         Lucarelli, Zachary <Zachary.Lucarelli@skanska.com>

Sent:                                           Friday, October 31, 2025 6:58 AM

To:                                               Berriz, Sonia (Consultant)

Cc:                                               Prendergast, Patrick; Sharrer, Kyle; Ryan Abraham; Guerrero, Jon; Pao, Evelyn C.; Holmquist, Dan (Consultant); Tu, Sammy; Pang, Jason (Consultant)

Subject:                                     Re: [EXTERNAL] I-405 Brickyard - NW-12 Load Rating - OTS

 

Hi all,

 

I wanted to keep everyone on the same page. Jason and Sammy spoke through the OTS comments on NW-12 load rating at their call yesterday and then Jason sent the following over. We are hoping these can be addressed prior to the formal submission.

 

• Weight of barrier needs to be included per BDM 13.2.1
• We discussed with 4M modeling the structure as a 3 sided box. The bottom slab properties were not field verified. Please revise. Understood the changes in demand may be small.   
• MBE 6A.5.1.12.10.2 says a reduced earth pressure should be used when calculating maximum positive moment in the top slab. Please confirm this was done - We discussed on 10/30 that it was conservatively neglected for positive moment
•  Why is the area of steel being divided by 3 to convert to CSI (pp6)? – We discussed on 10/30 and it was done to relate the size and spacing of the reinforcement already entered in the CSI model.
• As you mentioned in your email on 10/27, 2 lanes were checked for all vehicles, and the rating factors were adjusted appropriately. Please submit.
• Please submit the report formally. The Bridge Office is reviewing the OTS but will require review of the final report (BDM 13.4). The project office is completing review of the files sent this Monday.
• Skanska installed ½” plates over the vault openings that were buried. When checked for HL-93 loading, their consultant determined that a 1” plate was needed. Shoring posts were added beneath the plate. We understood the same ½” plate was used to cover drainage structures and without additional support. Not sure those openings are smaller. Please propose how this will be addressed with either the plate replaced with a thicker plate or design provided for support.

 

I think Sammy is able to address most of the comments, I believe coordination is needed with Skanska on the last bullet.

 

-Sonia

 

Sonia Berriz, P.E.
berrizs@consultant.wsdot.wa.gov
(425) 876-6283 (cell)

 

 

 

Sonia,

 

Below is a link to an OTS of the NW-12 load rating performed by AECOM. Please let us know if you have any questions. I believe this is the right group, cc'd here.

 

Due to the file size, please confirm confirmation of receipt.

 

​I405-BRICKYARD-NW12 CULVERT LOAD RATING EVALUATION REPORT (draft).pdf​

 

Please ignore the previous messages, where this failed to send due to file size.

 

Thanks,