eng20120319-Miller-ROW-storm_extension.pdf
City of Edmonds
TH
121 5AVENUE NORTH •EDMONDS, WA 98020 • (425) 771-0220 FAX(425) 771-0221
Website: www.ci.edmonds.wa.us
PUBLIC WORKSDEPARTMENT
EngineeringDivision
Plan Review Corrections
ROW Application :Date:
#eng20120319August 6, 2012
Project Name/Address:
Miller / 114 Caspers Street
Contact Person/Address/Fax:
Joe Schmaus –classicohomes@gmail.com
Donna Breske –donnabreske@comcast.net
Reviewer:Jeanie McConnellDivision:Engineering
During review of the subject submittal it was found that the following information, corrections, or
clarifications will need to be addressed:
The following comments are provided by Jerry Shuster, Stormwater Engineering Program Manager:
For this permit, I reviewed the following:
Request for Review and Approval of Storm Water Pump Basin, 114 Caspers Street, from Donna L.
Breske, P.E., to City of Edmonds, July 18, 2012 (Letter with attachments)
Pump System Report for 114 Caspers Street, Edmonds Wa, Single Family Residence, prepared by
Donna L. Breske, P.E. for Marsha & Eric Miller. July 12, 2012
Sheet 1 Storm Drain Routing and Pump System for 114 Caspers Street, Edmonds , WA98020, July 26,
2012.
1.The first page of the letter with attachment states that a Royal Kor pipe will be used as a pump basin and
eliminate the need for concrete ballast for buoyancy concerns.No calculations are provided in support
of this.Also, the “Pump System Report” includes buoyancy calculations for a concrete collar around the
base of the pump basin.Please clarify which approach will be used.If the Royal Kor pipe is proposed,
provide calculation that show a concrete collar at the base is not required.
2.The pipe headloss is calculated using 40 feet of 3/4” discharge line.The plans show 45 feet of 3/4”
discharge line plusapproximately 3.4 feet for 1.5 inch discharge line.The pumps discharge rate should
be calculated using the pipe headloss for the 45 feet of 3/4” discharge line plus approximately 3.4feet
for 1.5 inch discharge line.
3.Per the City of Edmonds Engineering Division Policy ENGR-DEV(STM)-2011-02, item 7., an overflow
path must be designed so that a power outage or other pump failure does not result in flooding of a
building or an emergency access, erosion or sedimentation downstream, or slope failure.Please provide
this information.
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4.On detail 1, show where the discharge pipe changes from 1.5 inch to 0.75 inch.Also, include the
elevation of the centerline of the discharge line.
5.On the plan sheet the extruded curb next to the proposed 6 inch DI pipe will need to be replaced. Add
note to plan sheet.
Additionally, please take note of/address the following:
1.As noted above, it has been determined that the extruded curb is in such a deteriorated condition that
integrity of the curb cannot be maintained during trenching and installation of the storm line in the flow line.
As such, the curb willneed to be removed and replaced with the storm main extension. Please call out this
requirement on plan sheet and reference City standard detail E2.7.
2.The initial proposal included connection to an old brick manhole. During a field meeting it was determined
that connection to a north/south storm main crossing, via installation of a new CB, would be an option the
City would consider. The latest submittal shows the design as such and calls out this north/south main line
as clay pipe. Taking this into consideration along with the fact that the elevations provided areinterpolated
(and without the benefit of a straight line from structure to structure), staff has determined that connection to
the brick manhole is the option we would approve. Please revise plans to show the layout consistent with
the original submittal, but with updated invert elevations to match the revised on-site storm system layout.
a.You might also consider replacing the existing curb inlet with a standard Type I catch basin and
chasing the existing pipe between inlet and brick manhole to a point where you could get needed
elevations andconnect to the existing pipe with a fernco instead of going into the brick manhole.
b.The water main crossing will need to be potholed prior to construction to verify no utility conflicts
exist. It was also pointed out that the gas crossing in this location is of concern. Potholing efforts
could address both at the same time.
3.Please provide a traffic control plan that addresses both the sidewalk closure and disruption to the travel lane
during construction.
Please resubmit 3 copies of the revised pages to my attention. Please feel free to contact me should you
have any questions at 425-771-0220, ext. 1338 or by e-mail at mcconnell@ci.edmonds.wa.us
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