Costco is preparing to expand its Silverdale warehouse and relocate the store’s fuel station.

Contractors filed for site development and building permits from the county for the project, and are seeking coverage under state stormwater permits, according to a legal notice published Tuesday.

Costco plans to add 13,300 square feet to the north end of its warehouse, while reconfiguring its receiving bay. The addition will increase the building’s overall footprint to 152,760 square feet, according to plans filed with the county

Costco will also shift its fuel station from the southwest corner of the parking lot to the southeast corner. The old fuel station will be replaced with new parking.

(Click on the image above to see my approximation of Costco’s plans.)

The project is expected to begin at the end of August and be completed by September 2016, according to an application filed with the Department of Ecology.

A store manager has not yet returned a message left this week requesting more detail. Costco is located at 10000 Mickelberry Road.

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