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June 20, 2019
Zack Richardson, Stormwater Engineer
City of Edmonds
121 5th Ave N, Edmonds, WA 98020
Phone: 425-77L-O224
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Dear Zack,
Please find attached revised site plans, which reflect the changes as requested in the plan
review dated April 5, 2Ot9. Our response to each comment is shown below in bold.
1. The architectural site plan refers to civil drawings for grading and drainage but no civil
drawings were submitted, A site-specific site plan showing grading and drainage along with
the improvements proposed under this permit, is required.
Update: Civil plans submitted, but drainage memo or report specific to the building permit
has not been submitted and the no summary of the proposed impervious surfaces or sizing
of the BMPs is provided. Show on the civil plans, or submit a permit specific drainage memo
that references the plat documents but which provides, the actual proposed square footages
and BMP sizing calculations based on this permit submittal. Additional comments regarding
necessary revisions to the civil plans are below.
A drainage memo specific for the lot has been created to address storm design.
2. Include an erosion and sediment control plan and ensure it protects the infiltration facility
areas from construction traffic.
Update: It appears the construction entrance is proposed over the planned pervious
driveway; relocate construction entrance and protect infiltration surfaces with construct¡on
fencing or provide notes as needed stating that over excavation and geotechnical approval
of the subgrade is required prior to placing the ballast rock (or any material) for the
pervious pavement section.
The construction entrance has been angled to avoid the permeable pavement area
as much as possible, Orange fencing has been placed around the permeable area.
3. Civil Plans: Show the limits of the rock around the chambers and update dimensions
between the property line and edge of infiltration facility; setback are applied to the limits of
the rock (infiltration occurs in full footprint of rock).
If utilities fall within required setbacks from the chamber system, provide additional
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RE:
5920 100tr' St SW, Ste #25
Lakewood, WA 98499
phone: 253-301.-4157
fax: 253-336-395t
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information (trench elevation vs chamber elevation) and/or additional improvements
(impervious liners, etc) to ensure infiltration water does not end up in utility trenches
Chamber rock and dimensions have been added.
4. Civil Plans: Show a dimension, or minimum dimension, between the proposed structure
and infiltration system.
If the proposed structure is within setbacks, geotechnical approval of the plan (with dates)
is required prior to approval.
Dimensions have been added.
5. Civii Plans: identify where the footing drains fo¡'the irome ai=e pi-oposed to outiet,
If proposed to connect to the chamber system, add notes accordingly and list a minimum
footing drain elevation which is a minimum of 6" above the design max water surface,
Footing drain discharge location has been provided.
6. Civil Plans: Provide additional information of the actual configuration of the chamber
system:
a. Show an inspection port in plan view near the south-east end of the
chamber system and cross out -all referenees to the inspection port being
"optional" in details.
b. Clarify if the length dimensions provided represent chamber or gravel
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c, Assuming the listed length is the chamber length (without rock), it appears
the proposed chamber length would require a fractional length of chamber
(at least with the limits of details provided); revise proposal to design the
chamber system as it can actually be built or provide additional direction
for cutting and connecting a fractional chamber along with confirmation
that such approach falls within the manufacturers recommendations and
specifications.
d, Provide a pipe size and slope for the inlet pipe between the chamber and
the area drain.
Inspection port has been added, chamber dimension have been clarified, and
information has been added for the inlet pipe. The chambers are now full sections,
so no cutting is required.
7. Civil Plans: Provide a riser prior to the chamber system as shown in Edmonds detail SD-
637.
An area drain/YDCB, as shown, ffiây not provide sufficient space for the riser and may
require a larger basin size.
The area drain has been replaced with type I catch basin.
Thank you for your time and assistance in the review of this project. Should you need any
additional information, please do not hesitate to contact me at 253-984-2900 or via email at
mkel ler@ beylerconsu lti ng. com.
Sincerely,
Weryäer Cwv"asas**xnE
Mark Keller, P.E.
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