bld20140238_SwedishACC-1.docx
CITY OF EDMONDS
PLAN REVIEW COMMENTS
ENGINEERING DIVISION
(425) 771-0220
City Website: www.edmondswa.gov
DATE: April 25, 2014
TO: Wade Watkinson, KPFF
FROM: JoAnne Zulauf, Engineering Technician
RE: Application #: bld20140238
Project: Swedish Medical Center
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Project Address: 21601 76 Ave W
During review of the above noted application, it was found that the following information,
corrections, or clarifications are needed. Please submit three (3) sets of revised plans/documents
with a written response to each of the items below to a permit coordinator. City of Edmonds
handouts, standard details and development code can be referenced on the City website.
Sheet C4.01
1.The existing road north of the area of disturbance falls under the requirements of the 24’ width for
two lane traffic. Please revise areas of the road that do not meet that requirement.
Sheet C4.03
2.It appears the structure 18A may be within the ramp area required for ADA compliance at the
corner.
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3.The curb ramp at the west corner at 216 may need to be upgraded to meet ADA requirements.
Please add note or call out to indicate this possibility.
Sheet C4.04
4.There is no indication that this road is to be one-way. If it is intended for two way traffic, then
minimum width is 24’. Please revise width or note if one-way.
Sheet C5.13
5.Replace CB 24 with Type 2. Lowest invert to rim > 5 ft.
Sheet C5.31
6.Add structure midway between SDMH 30 and SDMH 26 for increased accessibility.
Traffic Impact Assessment
Please provide information regarding how Entry/Concourse and 2nd Floor Shell were calculated in
Table 7.
Swedish ACC Page 1 of 3
Drainage Comments: (previously emailed)
Drainage Report - March 2014
Section 1, page 1, third Paragraph – Our records show the detention system for the
Central Utility Plant is a 48 in diameter system, not 36 in diameter. Our plans show the 48
inch diameter pipe connecting to the existing control structure via 36 inch reducer pipe;
this was probably found by the surveyors.
Section 3, page 3 – This section should include a table of the new and the replaced
impervious surface area for the entire project. Note the portion of the replaced
impervious surface area that is a result of utility installation only.
Section 3.7, page 8 – SDMH 01 – As noted above, the Central Utility Plant detention system
has a 48 in diameter pipe not 36- diameter pipe. Please make this change on the
appropriate plan sheets as well. Modify the riser elevation in the plans for the 48 inch
diameter pipe.
Section 3.7, page 8 – SDMH 22 – Our records show the existing system consists of 224 LF of
24 inch detention pipe and 42 feet of 12 inch detention pipe. Also, our plans show a 5.5
inch orifice on the control structure. A 6.94 inch orifice is proposed. Please reconcile.
Section 3.7, page 8 – SDMH 26A – The reduction in detention volume to approximately
1,300 cf is appropriate for the reduced tributary area. The current configuration of the
control structure shown in plan sheet, specifically the orifice size, is not documented. With
the elimination of the entire existing 36 inch diameter detention pipe and part of the
existing 48 inch diameter detention pipe, the stage-storage-discharge characteristics will
change from the original design. Please document the new configuration.
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Appendix E - Infiltration facility Calculations – provide the 2 page of the StormTech
stage-storage table (missing the rows for 0 to 18 inches).
Appendix G – Conveyance Calculations – Provide a figure showing the drainage basin
delineation for the 4.23 acres carried by the 12 inch main and the 6.95 acres cared by the
18 inch main.
Plan Sheets - March 2014
General Comment on Plan Sheets – The symbols in the Legend do not always match the
symbols on the plans for a SDMH, Type 1 CB, and Type 2 CB. For example on Sheet C5.11,
“CB 01A should be called out as a Type 2. The plan sheet appears to have a frame & grate
on it ,yet calls for a solid lid. It is also not clear the difference between a SDMH and a CB
type 2. All SDMH’s have control structures yet they should be CB type 2 (See City of
Edmonds Standard detail E5.4). Please clarify the symbols in the legend and on the plans
for all the storm drainage structure. Also, on Sheet C5.20, it is unclear how Detail 2
applies. Please clarify.
Sheet C2.00 – Demo Plan - This plan calls out demolishing of existing storm system up a
point without mentioning the new structure number or a reference to sheet the with the
new infrastructure. For example, one call out says: “ Demolish Ex 15” SD north of
connection to proposed SD CB.” This call out should show the number of her proposed CB
or MH and the plan sheet where it is located.
Page 2 of 3
Sheet C5.11 – Drainage Plan – The detention pipe connected to SDMH 01 needs an access
riser since it is longer than 50 feet.
Sheet C5.13 – Drainage Plan –
CB 19 is within the waterline easement. Please relocate the structure out of the
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easement.
For CB 24, is this existing structure large enough to handle all the pipes
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shown? Replace/re-size as needed.
The detention pipe connected to SDMH 22 needs an access riser since it is longer
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than 50 feet.
Sheets 5.13 - Drainage Plan and C5.16 – Foundation Drainage Plan -
It appears that the foundation drain connects to CB 18. If this is the case, add the CB
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number to Sheet C5.16.
On Sheet 5.13, there appears to be a conflict between the pipe connecting the
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foundation drain to CB 18 (electrical vault?), please reconcile.
Foundation drains should not be connected to the infiltration system without
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accounting for it in the design. It is unclear if it was accounted for in the design of
the infiltration system (this also conflicts with note 15 on Sheet C1.10). An estimate
from the geotechnical firm could be a justification for connecting to the infiltration
system, if it is estimated to be negligible flow compared to the runoff.
Sheet C5.22 Drainage Details – For details 1 through 4, use the City of Edmonds standard
detail E5.4, Flow Control Structure (also applies to Detail 2, Sheet C5.21). Add manhole
structure diameters and out pipe invert elevation to all flow control structure details.
Detail 2 - A 18 in diameter HDPE pipe is show entering SDMH 22. Sheet C5.13
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shows the new detention pipe is 24 in diameter HDPE, please reconcile
Detail 3 – A 12 inch diameter riser is shown. The modeling for this system used an
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18 inch diameter riser pipe. Please reconcile.
Detail 4 - The detail does not show how the 24 inch reducer will be fitted to the
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existing 48 inch pipe. Please include. Also add the word “existing” before the 48
diameter pipe.
Detail 5 – Highlight the Filterra units that will be used in this project in the table at
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the bottom of this detail.
Page 3 of 3