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December 8, 2022
Andrew Van Gordon - Associate Planner
Nathan Janders, Civil Engineer
City of Renton
Department of Community & Economic Development
1055 South Grady Way
Renton, WA 98057
RE: Castro Preliminary Short Plat Submittal – LUA22-000053, SHPL-A
Beyler Project No. 18.00392
Andrew & Nathan:
The purpose of this letter is to address engineering comments in the “On Hold” notice dated
September 15, 2022 for the proposed Castro Short Plat. To expedite your review and approval
of the subject plans, below are our responses in bold, with your comments included herein
for reference:
1. A sewer availability letter from Soos Creek Water and Sewer District should be
provided, only water was included with the revision.
RESPONSE: The Sewer Availability Letter is included.
2. In the TIR a flow control facility exemption is claimed per section 1.2.3.1.B of the
RSWDM due to an increase of less than 0.15 CFS. However, the project is not
vested to the 2017 RSWDM and must comply with the 2022 RSWDM which was
adopted in June of 2022. In the 2022 RSWDM flow control facility modeling credits
cannot be used to decrease the size of a facility with exception of full dispersion and
full infiltration. The TIR indicates that full infiltration is used for the rooftops,
however, the geotechnical report indicates that full infiltration is not supported but
limited infiltration is. The TIR, specifically the flow control facility, must be updated
per the 2022 RSWDM.
a. Note, if a detention facility is determined to be required then a Type 4
downstream drainage problem shall be evaluated in the downstream analysis.
RESPONSE: Storm report no longer claims flow control exemption. The flow control
standard is being met through the use of pervious pavement, which infiltrates
below fill soils, and above impermeable soil layers.
3. The applicant should verify with geotechnical engineer the stability of fill soils when
saturated see section C.2.7 Permeable Pavement Infeasibility Criteria List no. 7).
RESPONSE: Forthcoming from Geotech.
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If you have any questions or need additional information, please feel free to contact me at
(253) 984-2900 or CWashington@BeylerConsulting.com.
Respectfully,
Camille Washington, Project Manager
Beyler Consulting, LLC