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Af CITY OF EDMONDS
PLAN REVIEW COMMENTS
-� ENGINEERING DIVISION
(425) 771-0220
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DATE: November 10, 2016
TO: Robin Kearsley
r@kearsleyhomes.com
FROM: Jeanie McConnell, Engineering Program Manager
jeanie.mcconnell@edmondswa.gov
RE: Application #: bld20160179
Project: Therrell - Single Family Residence Addition
Project Address: 8609 Talbot Rd
During review of the above noted application, it was found that the following information,
corrections, or clarifications are needed. Reviews by other divisions, such as Planning, Building, or
Fire may result in additional comments. Please redline plans or submit three (3) sets of revised
plans/documents with a written response to each of the items below to a permit coordinator.
Resubmittals can be made at the Development Services Department on the 2"d floor of City Hall.
Permit Center hours are M, T, Th & F from 8am-4:30pm and on Wednesdays from 8:30am-noon.
City of Edmonds handouts, standard details and development code can be referenced on the City
website.
Comments 1 — March 30, 2016
Comments 2 — August 19, 2016
Comments 3 — October 12, 2016
Comments 4 — November 10, 2016
A revised geotech memo has been received and the plans have been updated with several
notes. A more concise list of plan review comments is being provided below, instead of
5 E110 going item by item from the preivous plan review comments. It is challenging to represent
civil construction plan related items, including stormwater elements, on an architectural
site plan. It may be best to separate civil improvements from the overall site plan to
provide the necessary clarity.
1. The infiltration trench design is wrongly specified by reference to �Fig—.3-2 of the 2005-DOE
SWMM. The City's infiltration trench is specified in Figure A-3 of Handout E72B. The
differences are the depth of trench varies and the wash rock specification provides for more
storage. Please revise memorandum and plans accordingly.
1
The infiltration sizing factor of 4.0% is meant for 3 foot depth of aggregate. Figure 3.2 of
the 2005 DOE SWMM only specifies 18-inches of aggregate depth, only half of the required
depth. Revise plans and memo accordingly.
3.
The Infiltration Sieve Analysis provided in the geotech memorandum, shows termination of
the particle size distribution at 0.074 mm (#200 sieve). This is consistent with the Unified
WOSg
Soil Classification System. The City specifies the use of USDA for soil classification. See
City handout E72D.
4.
Provide additional information for each of the storm lines connecting roof and driveway
l -
runoff to the infiltration trenches, including pipe size, material, slope, inverts, length, and
intended construction method (a portion of the pipe is shown under the existing driveway).
5.
The larger trench is specified as 86-feet in the trench length calculation, yet is shown as 88-
156
feet on the plan. Please confirm 88-feet is what you intend to construct.
6.
Provide information for each of the pre -trench collection systems. Callout catch basin size,
pipe connections and invert elevations.
7.
Provide a detail on how the infiltration trenches will overflow to Talbot Road. Infiltration
trenches are flat bottomed, hence overflow from the system will be everywhere along the
—
trench unless a specific overflow has been designed. Please keep in mind that the property
slopes to the northeast, so as designed, this is the direction the overflow from the system
would naturally gravitate which would negatively impact the adjacent property owner.
8.
A filter fabric fence has been shown along the southwest property line, which is on the
`®
uphill side of the project. Revise plans to show the silt fence on the down slope side of the
project. The silt fence shall be placed such that it prevents sediment from leaving the site
during construction.
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