HomeMy WebLinkAboutC_On_Hold_Letter_180330
March 30, 2018
Marion Nielson
Lanktree Land Surveying Inc.
421 B St NE
Auburn, WA 98002
SUBJECT: "On Hold" Notice
Cho Short Plat / LUA18-000177, SHPL-A
Dear Ms. Nielson:
The Planning Division of the City of Renton accepted the above master application for review on March
13, 2018. During our review, staff has determined that additional information is necess ary in order to
proceed further.
The following four (4) Technical Information Report (TIR) items will need to be addressed before June
29, 2018 so that we may continue the review of the above subject application:
1. The sizing calculations for the detention facility only includes about twenty five percent
(25%) of the total area that should be included, as the existing pervious surface area is
incorrectly excluded from the calculations.
2. Raingardens are proposed as an onsite BMPs for the roof run-off. The sizing calculations for
the detention facility takes ten percent (10%) credit that is specified for bioretention areas.
Raingardens and bioretention areas are fundamentally different. Raingardens do not receive
sizing credits for the sizing of detention facilities. Either remove the credits from the sizing
calculations or bioretention will need to be utilized in place of the proposed raingardens and
sized as outlined in Appendix C of the 2017 Renton Surface Water Design Manual.
3. The Engineer who prepared the TIR is claiming exemption from water quality treatment
since the pollution generating impervious surface (PGIS) is less than 5,000 square feet (SF).
However, this total does not include the roadway widening PGIS. The total PGIS for the
project is approximately 7,749 square feet (SF), which exceeds the maximum criteria to
qualify for the water quality treatment exemption. Either reduce the PGIS to less than 5,000
SF or provide water quality treatment as outlined in the 2017 Renton Surface Water Design
Manual.
4. The TIR does not reference Special Requirement #6, which is applicable to the project.
At this time, your project has been placed “on hold” pending receipt of the requested information.
Please contact me at (425) 430-7289 or cclose@rentonwa.gov should you have any questions.
Sincerely,
Clark H. Close
Senior Planner
cc: Woong Hee Cho and Hee Yong Cho / Owners
Mimi Grant / Party of Record