HomeMy WebLinkAbout0_Response to On Hold Notice_2022.03.16P:\2021\21807_Shum Residence - Renton\Drawing\Outgoing\City\2022.04.01_Response to PSP 1st Comments\21807_Response to City Comments_Stormwater_20211213.docx
April 1st, 2022
Angelea Weihs, Associate Planner
Planning Division
Renton City Hall
1055 South Grady Way
Renton, WA 98057
RE: “On-Hold” Notice for Shum Short Plat
(LUA22-000017 SHPL-A, MOD)
Response to Comments dated March 16th, 2022
Dear Angelea,
This letter, as well as the resubmitted drawings and documents, are provided to
address the City’s On-Hold Notice referenced above. We have addressed the requests
for information requested using the same numbering system as in your letter:
1. Runoff from Queen Avenue frontage and roadway is directed to the proposed
detention system to the maximum extent feasible. The remainder of bypass
runoff has been incorporated into the WWHM modeling and addressed per
Section 1.2.3.2.E of the RSWDM. The sum of proposed outflows does not
exceed existing outflow per the Peak Rate Flow Control Standard.
2. The perforated pipes within the detention system have been increased to 3 feet
in diameter, and the plan-set and storm report have been revised accordingly.
3. Per Table 4.1 of the RSWSDM, the setback from the edge of the detention
system to the tract & property line shall be 5 feet and is designed accordingly.
This also meets the requirement of pipe centerline setback at least 1.5 times
the depth of the invert of the system. In this case, 4.5’ depth requires a 6.75’
setback. A setback of 8.5 feet is provided on all sides to the pipe centerlines.
4. A dedicated tract is proposed for the detention system.
Lacey
Seattle
Engineering & Planning
14900 Interurban Ave. S
Suite 279 Seattle, WA 98168-4635 Ph: 206.674.4659
www.patrickharron.com
Shum Residence
Page 2 of 2
P:\2021\21807_Shum Residence - Renton\Drawing\Outgoing\City\2022.04.01_Response to PSP 1st Comments\21807_Response to City Comments_Stormwater_20211213.docx
Civil Electronic Resubmittal Package Transmittal
Please don’t hestitate to contact me should you have any questions.
Thank you,
Patrick Harron & Associates, LLC
Schwin Chaosilapakul, PE
March 16, 2022
David Wu
dwudesign
14632 14th Avenue SE
Mill Creek, WA 98012
SUBJECT: "On Hold" Notice
Shum Short Plat / LUA22-000017 SHPL-A, MOD
Dear Mr. Wu,
The Planning Division of the City of Renton accepted the above master application for review on February 21,
2022. During our review, Staff has determined that additional information is necessary in order to proceed
further.
The following information will need to be submitted before June 14, 2022, so that we may continue the review of
the above subject application:
1. The TIR provides a screen shot of the WWHM model used. The developed condition includes all target surfaces
and is a single basin being routed to the detention facility. However, there are target surfaces such as the
driveways, sidewalk along Pierce Ave NE and street improvements along Queen Ave NE that are shown on the
conceptual utility plan as bypassing the detention facility. The TIR, and drainage plans, need to be updated;
acceptable methods may include:
a. Update the WWHM model to account for bypass areas in accordance with section 1.2.3.2.E of the
RSWDM, or
b. Update the utility plan to route all target surfaces into the detention facility, or
c. Update both the WWHM model and utility plan due to a combination of modeling bypass and routing
additional flow into the facility per a and b above, or
d. Another acceptable method per the RSWDM.
2. The proposed detention tank is 2 feet in diameter however, the minimum diameter per section 5.1.2.1 of the
RSWDM is 3 feet. Update tank accordingly.
3. Building setbacks and easement widths shall be in accordance with table 4.1 of the RSWDM. It does not appear
that these are met.
4. Drainage vaults, ponds, etc., shall be located within dedicated tracts.
David Wu
Page 2 of 2
March 16, 2022
At this time, your project has been placed “on hold” pending receipt of the requested information. The maximum
time for resubmittal shall be within 90days of this notice. Please contact me at (425) 430-7312 if you have any
questions.
Sincerely,
Angelea Weihs
Associate Planner
cc: Hoi Fung Shum/ Owner(s)