4458_001.pdfNovember 8, 2018
Zack Richardson
City of Edmonds
1215 1h Ave North
Edmonds, WA 98020
RE: Permit BLD20181169 10610 2401 PL SW, Edmonds
Engineering Comment letter October 2, 2018
Dear Mr. Richardson,
We are in receipt of the comment letter dated October 18, 2018 and have made
changes to our plans in response. Below are the items from the letter, with additional
comments describing our updates to the plans.
GENERAL
1 . A 1 -1: The infiltration location is shown, however is not clear how drainage is
to reach the trench; update site plan to show routing of roof drain lines, provide
a collection point (ie. drain) for the driveway runoff, and show routing of
driveway drain to trench.
We have updated the plans to show the drainage around the buildingfrom
downspouts and driveway trench drain.
a. Provide enough grading information to show that the driveway will drain
to the intended collection points.
We have added invert elevations to the plans, a trench drain at the end of
the driveway, andflow direction arrows to the drain.
2. Update site plan to show the location of the sump basin, clean -out, and
inspection port as shown in the detail.
We have added the sump basin, clean -out and inspection port to the plans.
3. Update site plan to provide elevation inforination for any drain or cleanout
inverts and rim/finished grade, and provide the bottom elevation, the top of
trench elevation (top of rock), and the finished grade elevation for the
infiltration trench system.
We have added elevation information to theplans as requested.
4. Update site plan to show the routing and discharge location of any proposed
footing drains.
There are no existingfooting drains on the home. None areproposed on the
new garage.
a. Note that the infiltration trench will retain water up to the top of
trench/rock; footing drain may not be placed below this elevation and still
discharge to the system. Understood.
RESU&383 158' Ave NE, Suite 250
Redmond, WA 98052
NOV 0 8 2018, 425-636-8006
BUILDING DEPARTMEN]
CITY OF EDMONDS
b. A separate, lower, infiltration system/drywell for the footing drains is
permissible. Understood.
Update the TESC component of the site plan to provide protection of the
infiltration area during construction of the infiltration area; typically achieved
with orange construction fencing to keep construction vehicles from
compacting the area.
We have added this note to theplans.
Update the sizing calculation to provide a more complete reference to the
geotechnical information/report; include the firm/company of the author and
the date it was prepared.
We have added this information to the plans.
Add notes and callouts as needed to indicate that all disturbed area must
receive amended soils per SWMMWW BMP T5.13 and be full stabilized prior
to construction approval.
We have added these notes to the plans. The client has also printed out the
BMP T5.13 Post -Construction Soil Quality and Depth section 5- 7 and
included with the resubmittal.
Provide details or specifications sufficient for the contractor to be able to
install soils meeting the requirements of T5.13.
We have added notes to theplans as well as included the section 5-7
information referenced above to clarify the requirements.
Callout or note the method of final stabilization; assumed to sod, but landscape
beds finished with mulch would also be stable.
The beds will be amendedper the T5.13 with mulch, and the abandoned
driveway will be amended and be hydro seeded.
se do not hesitate to call should you have any questions on this resubmittal.
erely,
ners Architectural Design Group, Inc.
E. Koch
-ipal
Updated drawings dated 11/08/2018
SIM7
8383 158th Ave NE, Suite 250
Redmond, WA 98052
425-636-8006