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September 6, 2022
Andrew Van Gordon
Associate Planner
1055 S Grady Way
Renton, WA 98057
RE: 18.00392, Castro Short Plat, LUA22-000053
King County Parcel No. 0739000085
Mr. Van Gordon,
The purpose of this letter is to address the review comments dated March 14th, 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:
Planning Division, Andrew Van Gordon
1. The proposed tree retention information does not match across the various
documents. The short plat drawings, Landscape Planting & Tree Replacement Plan,
and civil drawings all show differing tree retention information.
Response: Tree retention plan now consistent across all plan sets.
2. Tract B is shown as 20 feet wide on the short plat drawings. The civil drawings
show a 25-foot wide access easement. Please reduce the access easement to 20
feet.
Response: Civil Plans now show 20’ wide access easement consistent with
survey drawing.
3. Ten feet of on site landscaping is required along all public street frontages expect
for areas for required walkways and driveways. A ten foot on site landscaping area
is required on all lots and Tract A along the proposed public right of way and SE
176th St.
Response: Ten foot landscaping now shown on properties adjacent to public
right of way.
4. There shall be a minimum three foot landscaped setback at the base of retaining
walls abutting public rights of way. Terraced created between retaining walls shall
be permanently landscaped with a mixture of shrubs and groundcover (trees are
optional) in conformance with the standards of RMC 4-4-070 Landscaping. For land
that is not between two retaining walls (i.e., not a terrace) the lower soil grade
(i.e., ground at the bottom of a retaining walls exposed surface) and the upper
20.00100 l Trihn
City of SeaTac
Response Letter l 03.08.2022
Page 2 of 3
soil grade (i.e., ground at the top of a retaining wall) equaling one foot for every
one foot in height if the retaining wall.
Response: 3’ Landscape now shown at the base of walls. 10’ easement now
shown for walls for leveling a horizontal distance equal to the height of the wall.
5. Protected trees that do not contribute to a lots required minimum tree density
shall be held in perpetuity within a tree protection tract. A minimum of two
significant trees are required on each lot. Any protected trees in excess of the two
are required to be in a tree protection tract pursuant to RMC 4-4-130H.2.
Response: Understood. See Tree Tract ‘A’.
6. The grade level around any tree to be retained may not be lowered within the
greater of the following areas: (i) the area defined by the drip line of the tree, or
(ii) an area around the tree equal to one and one-half feet (1-1/2’) in diameter for
each one inch of tree caliper. A larger tree protection zone based on tree size,
species, soil, or other conditions may be required. Please identify how this
requirement is being met.
Response: See attached landscape and civil plans for tree protection.
Civil Engineering, Nathan Janders
7. A water and sewer availability from Soos Creek Water and Sewer district should
be provided.
Response: Water and sewer availability from Soos Creek Water and Sewer
district will be provided.
8. 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 modeling used to
support the exemption did not model the target areas, for which permeable
pavement and limited infiltration BMPs are proposed, in accordance with table
1.2.9.A of RSWDM. The table indicated how to model the developed condition for
which a BMP is applied to target surface (such as 50% impervious and 50% grass
for permeable pavement) ,however the modeling needs to be revised to
demonstrate compliance with section 1.2.9.A.
• Note, applicant should verify potential run-on as modeling credits are not given
for surfaces that run-on to permeable pavements.
• Note, if a detention facility is determined to be required than a type 4 downstream
drainage problem shall be evaluated in the downstream analysis.
Response: TIR outlines how proposed BMPs will meet the flow control standard
of matching pre-developed flows from 50% of the 2-year flow to the full 50 year
flow. No exemptions are claimed.
9. The proposed plan depicts the modified street frontage along SE Petrovitsky Road
listed in the pre application meeting. Application shall include a modification
request as a part of the land use application.
Response: The Modification Request justification is attached for your review.
10. Dedication of a 25 foot radius at the southwest corner of Tract A will be required.
Response: 25’ radius at southwest corner of Tract A is shown on plans.
20.00100 l Trihn
City of SeaTac
Response Letter l 03.08.2022
Page 3 of 3
11. Application should demonstrate how the future half road along the western
property line will be able to be built out in full with particular attention to the
grading along the west side of the roadway.
Response: A 16’ easement is now proposed along the western edge of the road.
This easement provides space for a 2:1 fill slope to be constructed that will meet
grade in the neighboring property. This fill can be utilized if other half of road is
improved.
12. The application 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: Geotech will verify saturated soil stability before construction.
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
Beyler Consulting, LLC