17-105489-Correspondence-05-21-20-V15
May 21, 2020 Job No. 1886-001-016-0016
Mr. Jim Harris
Senior Planner
City of Federal Way
33325 8th Avenue S
Federal Way, WA 98003
RE: Woodbridge Business Park (City File #17-105489-UP)
Impervious Areas Map Request
Dear Mr. Harris:
This letter is written on behalf of Federal Way Campus, LLC to provide a response to a
request regarding the Process IV Land Use Application for Woodbridge Business Park.
The response was requested by Kevin Peterson in an email on May 12, 2020. For ease
of review, we have provided a portion of the request in italics and included our response
in bold font below.
…I’m going to need a series of maps/plan sheets that graphically depicts:
1) All new impervious surfaces;
2) All impervious surfaces that are remaining in place (tech center building,
part of the parking lot, etc.);
3) And all areas of ‘replaced’ impervious surfaces (existing parking areas
that will be replaced with new parking lots or buildings)
A new, colored, impervious areas exhibit is attached with this resubmittal and it clearly
depicts all new impervious surfaces, existing impervious area to remain, and replaced
impervious areas. As the “Impervious Areas Calculations” table indicates, the total new
impervious area totals 43.9 acres, placing it well under the drainage manual threshold of
50 acres of new impervious surface. Therefore, the project does not qualify for Large
Project Drainage Review, nor does it trigger the Master Drainage Plan requirement as
outlined in Section 1.1.2.5 of the drainage manual.
The last impervious areas exhibit (EN-16) was submitted with the “Traffic Concurrency
Application Modification” package, dated November 12, 2019. The “Impervious Area
Calculations” table on the 2019 exhibit (EN-16) shows the total new impervious area being
44.05 acres, while the new exhibit (EN-20) shows 43.9 acres. The difference in the new
impervious areas between these two exhibits (reduction of 0.15 acres) is a result of
calculating the exact area of frontage road improvements and some very minor corrections
to some of the other area classifications.
Mr. Jim Harris
May 21, 2020
Page 2
The tables below are provided to show a comparison of the impervious area calculations
in the past exhibit (table on the left) and the most current (table on the right).
Exhibit EN-16 (2019) Exhibit EN-20 (2020)
If you have any further questions or require hard copies to be delivered, feel free to contact
me at (253) 838-6113. Thank you for your help and consideration.
Sincerely,
ESM CONSULTING ENGINEERS, LLC
ERIC G. LaBRIE, A.I.C.P.
President
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