HomeMy WebLinkAboutC_Email_RE Solera LID Performance standard.pdfFrom: Ann Fowler
Sent: Thursday, October 11, 2018 8:51 AM
To: Kevin Seiler
Cc: Jeremy Febus
Subject: RE: Solera LID Performance standard
Kevin –
My assumption, without seeing the outputs from the all the models, is that the bioretention bottom areas
are what is required for each basin based on the area tributary to the cell. For the preliminary application
I think the composite flood report, with supporting individual basin reports, will work.
One additional comment that I have is regarding the basins which run along Jefferson Ave NE. It appears
that public ROW run-off and private roof drain run-off is being collected and conveyed to bioretention
cells located within the public landscape strip (ie the public ROW). BMPs located within the public ROW
must only serve impervious areas located in the public ROW as noted in Section 1.2.9.4.1. This will likely
impact the bioretention areas needed for those buildings fronting Jefferson Ave NE.
I do want to point out a couple of pieces that I think will need to be looked at for the civil construction
permit application and review and may impact the sizing and location of the cells:
1. The following sections are applicable for Large Bioretention Facilities as noted in Section C.2
a. For all areas:
i. Section 5.2 – Presettling Requirements
ii. Section 5.2.2.1 for setbacks and general design criteria
b. Additionally for PGIS Areas (or bioretention cells which receive combined PGIS and non-
PGIS run-off):
i. Section 6.8.1 – Contributing Areas
ii. Section 6.8.1 – Presettling Requirements
2. Based on the required bioretention areas noted for Blocks A and B, I am concerned about there
not being sufficient room for bioretention cells that meet all of the requirements of the Manual.
Since you are demonstrating compliance with the LID Performance Standard, the proposed areas
should be identified on the site plan. There will be no relief once we get to the construction
permit stage from this requirement due to lack of adequate area if you fail to verify that you have
adequate area now.
3. Also note: The bioretention areas for Blocks A and B will need to be designed as part of the
overall civil construction permit, not the individual building permits for each mixed-use parcel as
you note in Section 6.3 of the TIR. Implementation can occur with the individual building permits
in accordance with Section 1.2.9.4.
~Thanks
Ann Fowler
Civil Engineer III | CED
AFowler@Rentonwa.gov | Phone: (425) 430-7382
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From: Kevin Seiler [mailto:Kevin.Seiler@kpff.com]
Sent: Wednesday, October 10, 2018 10:40 AM
To: Ann Fowler <AFowler@Rentonwa.gov>
Cc: Jeremy Febus <Jeremy.Febus@kpff.com>
Subject: Solera LID Performance standard
Hi Ann,
We have updated our drainage report in response to comment #2 on the “On Hold” Notice for Solera. A
snippet of the updated sections (6.2 and 6.3) is below. Could you please review the modified sections to
confirm they align with what you were looking for? The entire drainage report is attached for more
context if needed.
Additionally, I’ve attached a table reflecting all of the area inputs, and MGS Flood reports for both the
full site and a single basin. All 67 basin reports and the entire site report will be in the drainage report
submitted.
Please let me know if you have questions.
Thanks,
Kevin Seiler
Civil Design Engineer
O 206.622.5822 D 206.926.0723
1601 Fifth Avenue, Suite 1600
Seattle, WA 98101