2861_001RAM Engineering
November 7, 2019
City of Edmonds Development Services Department
1215 th Avenue North
Edmonds, WA 98020
RE: Select Lot 7 of Westhaven Plat
Plan Check BLD20191247
1" Engineering Site Plan Review Comment Response
RAM Job No. 17-038
Staff:
This letter outlines the revisions and corrections made per Staff review. Below is a list of the comment
response documents addressing the comments and requests:
Planning Comments: Mike Clugston letter dated October 24, 2019
1. Structural lot coverage: Update Sheet SP-01 to show gross and net lot area and
recalculate lot coverage against net lot area.
Response: Area calculations updated as requested.
Stormwater Engineering Comments: Zack Richardson, PE letter dated October 28, 2019
Review Comments:
1. Engineer shall confirm in written response that connection of roof drain line at
plat constructed CB to the south-west is feasible and structurally sound given
existing pipe penetrations (2xl2" &2x6"), or revise connection to another
appropriate location within easement area.
Response: The added Lot 7 roof drain to CB #4 will be a 4" roof drain pipe. The
proposed 4' roof drain can fit in a standard CB just above and offset a 12" pipe without
compromising the catch basin structure. The plans have been revisedfor the 4" roof
drain to enter CB #4 at an elevation that will accommodate the two pipes. See revised
plans.
If there are any questions regarding the items above, please contact me at your earliest convenience; I
can be reached at (425)678-6960 or RobL@RAMengineeringinc.com.
Thank you,
W, F "� RESUB
Rob Long, PE NOV 12 2019
Principal BUILDING DEPARTIVIE141
CITY OF EDMONDS
RAM Engineering 16531 131h Ave W, Suite A108 Lynnwood WA 98037 (425) 678-6960 RAMengineeringinc.com
RAM Engineering
To: City of Edmonds Engineering Division
c/o Zach Richardson, PE Stormwater Engineer
121 5th Avenue North
Edmonds, WA 98020
From: Rob Long, PE
RAM Engineering
16531 13th Ave W, Suite A108
Lynnwood WA 98037
Subject: Select Homes: Westhaven Plat, Plan Check PLN20180034
Project Allowable Lot Impervious Allocation Revision
RAM Job No. 17-038
Memorandum
Date: November 7, 2019
This letter provides a revision to the allowable lot hard (impervious) surface allocation for the Westhaven plat. The
original plat design included a total new and replaced hard surface of the project at 51,200 sf, of which 42,000 sf of the
area was allocated to impervious on the lots. The applicant would like to revise the hard surface allocation for each
individual lot to support the building permit application for each lot. The following table provides the requested
reallocation and demonstrates that then revised numbers will not exceed the original approved hard surface allocation
of 42,000 sf for the lots. The new revised lot allocation will be 500 sf less than the original 42,000 sf design.
Westhaven Individual Lot Hard Surface Allocation:
Lot
Impervious
Lot
Imnervious
1
4,200
6
4,750
2
4,100
7
3,850
3
4,200
8
3,500
4
4,000
9
4,800
5
3,900
10
4,200
Total Lot Impervious Allocation
= 41,500 sf
If you have any questions or need additional information, please contact me at Robli.@RAMengineeringinc.coili or call me
at (425) 678-6960.
Thank you.
111-7119
RESUB
NOV 12 2019
BUILIDING DEPARTMENI
C" OF EDMONE)S
RAM Engineering 1653113 1h Ave W, Suite A108 Lynnwood WA 98037 (42-5) 678-6960 RAMengineeringinc,com