When Do I Need to Obtain a Grading-Drainage Permit? A Drainage Permit is required on a construction site when work involves coverage of over 2,000 square feet with an impervious surface such as apshalt, gravel or a building footprint.
A Grading Permit is required to fill or remove more than 50 cubic yards of soil on a site.
For most construction and for virtually all single family home construction, these permits are included as part of the the Building Permit or the subdivision approval process.
A Grading and Drainage Permit is required when grading is done before the Building Permit is obtained or when the construction does not require a Building Permit but meets the above referenced thresholds. (e.g. no structures are being built as is the case when constructing a parking lot)
How Do I Obtain a Grading & Drainage Permit?
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Submit application, a site plan showing the existing and revised contours of the property and engineering plans showing the drainage system to the City of SeaTac Engineering Division for review and approval. All plans and drawings are
to be prepared and stamped by a Washington State Licensed Civil Engineer.
The application and engineering drawings are reviewed for completeness and compliance with
City Ordinances, Road Standards, Surface Water Management Standards, WSDOT/APWA
Standard Plans and Specifications and the Manual on Uniform Traffic Control
Devices (MUTCD).
What Happens Next?
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Drawings or plans not approved by the Engineering
Division are returned to the applicant for correction.
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Drawings or plans approved by the Engineering
Division are stamped, signed and approved for construction.
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Estimated costs of construction are then calculated
by the applicant using the latest edition of the Engineering Division's quantity and cost work sheet
and submitted to the division for verification
using current construction costs.
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Permit fees and bond amounts (bonds are calculated
at 150% of the cost) are then calculated based upon the total estimated
cost of construction per the City of SeaTac fee schedule adopted by Resolution
99-032. The applicant then pays permit fees and posts the bond. Bonds can
be in the form of cash deposited to the City, a letter from a bank or
lending institution setting aside or guaranteeing the bond amount or a
paper bond purchased from an insuring agency. Fees will be based on the
value of the work.
The City then issues the Permit.
How Do I Check the Status of a Permit?
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If you have either the permit case number, parcel address or county assessor parcel number, go to the permit lookup web page, and you can find out your permit status. You are also welcome to call the engineering department at 206.973.4730 regarding permit status or any other questions that you may have regarding your permit.
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