bld20100092-OVWSD-E2.pdf
DATE: July 9, 2010
TO: Dave Jewett
Page & Beard Architects
jewett@pageandbeard.com
FROM: Jeanie McConnell, Engineering Program Manager
RE: Application #: bld20100092
Project: Olympic View Water & Sewer District Change of Use
Project Address: 23725 Edmonds Way
Review 1 April 2, 2010
Review 2 July 9, 2010
During review of the above noted application, it was found that the following information,
corrections, or clarifications are needed. Please redline plans or submit three (3) sets of revised
plans/documents with a written response to each of the items below to Theresa Umbaugh.
City of Edmonds handouts, standard details and development code can be referenced on the City
website.
GENERAL
7/9/10 The first bullet below has been stricken from the comments. A performance bond
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is not required from Olympic View Water & Sewer District. However, a cost estimate is
still required so inspection fees can be calculated for the project.
4/2/10 comment Please provide an itemized cost estimate, including units and unit prices, for
both on-site and off-site (right-of-way) improvements, including traffic control.
A bond is required to be placed for all right-of-way improvements. The amount of the bond
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will be based on 120% of the City approved estimate for all right-of-way improvements.
The City will inform you of the appropriate bond amount after review of the cost estimate.
Bond forms can be obtained from Marie Harrison, Permit Coordinator 425-771-0220 or
Harrison@ci.edmonds.wa.us
Inspection fees for this project will be calculated at 2.2% of the 120% City approved
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estimate for all improvements.
7/9/10 Response letter states contractor will submit TCP to City prior to starting any
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frontage work and it also notes that WSDOT stated their approval was not required.
Please note, the TCP will need to be submitted to the City for review and approval prior to
building permit issuance.
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4/2/10 comment - Please submit a traffic control plan (TCP) and haul route plan for review and
approval. Due to the work proposed in SR-104, please confirm with WSDOT whether or not
they will require their own approval of the TCP.
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STORM DRAINAGE REPORT
7/9/10 Review comments from Jerry Shuster were e-mailed to Pace Engineers on June
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25, 2010. Those comments are provided again as follows:
Figures 6 and 7 are very helpful in presenting the changes proposed for the facility. The area
calculations are good but are not reflected in the hydrologic modeling and therefore the design
of the storm system.
Based on Figures 6 and 7 the input for the hydrologic modeling for existing and proposed
conditions should be:
Impervious Landscape Forest
Acres CN Acres CN Acres CN
0.35 98 0.3 86 0.16 81
Existing
0.55 98 0.26 86 0 --
Proposed
Also, the time of concentration for the existing condition is to short and results in a peak flow
that is to high. The Tc should include 80 feet of sheet flow across the assumed forest area at a
slope of 1% for a Tc of about 35 minutes.
Once the existing condition hydrographs are computed, the existing storage volume of 385.1 ft3
can be modeled as 122.5 LF of 24 inch diameter pipe (equivalent length). You then can size the
additional amount of 24 in dia.pipe and the outlet structure configuration to match the 10- and
100-yr existing flows.
The water quality design is acceptable. Page 6 of the memorandum from Zach Kvasnikof dated
6/14/2010 mentions the W&H Pacific maintenance instructions for the water quality vault.
Those "verbal instructions" need to be formalized into an maintenance procedure and included
in the drainage report.
4/2/10 comment - City records indicate the subject property was annexed into the City in 1994.
The storm detention system installed on the property appears to have been approved by
Snohomish County and the City does not have any records pertaining the design and calculations
for the existing system. Please provide design calcs and report for the existing system. Once
this additional information is received the design proposal will be reviewed in its entirety.
C0.0 Cover Sheet
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C0.1 Topographic Survey
1.At the CB south of the water quality vault, please indicate pipe size and material for each point
of connection.
C1.0 TESC and Demo Plan
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C1.1 TESC & Demo Details
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C2.0 Grading & Storm Drainage Plan
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6.Please clarify/revise impervious surface calculations as follows:
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7/9/10 This comment and the following comment request information that helps track
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impervious surface area changes to the site. Under developed conditions please
breakdown impervious area to specify existing to remain and new and/or replaced.
This information is to be shown on the plan sheets even if it is a repeat of information
found within the storm drainage report.
4/2/10 comment - Specifically state the total proposed impervious area.
4/2/10 comment - It is assumed the Developed Impervious area total is the new total
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impervious area for the site, including the existing impervious that is to remain plus the
proposed impervious area. Is this accurate? If so, please label as Total Impervious Area.
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C2.1 Grading & Storm Drainage Notes & Details
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L-1 Irrigation Plan
7/9/10 Comment was not addressed.
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4/2/10 comment - Landscape irrigation lines shall be located on private property unless a
separate encroachment permit is obtained to install within the City right-of-way. Please refer to
City handout #E26 for additional information regarding encroachment permits.
Please contact me at 425-771-0220 or by e-mail at mcconnell@ci.edmonds.wa.us if you have
specific questions regarding these plan corrections.
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