If the Seattle Mariners “left it all on the field” at the end of the 2017 baseball season they won’t be able to get it back next year, as the playing surface is being completely replaced at Safeco Field.

The offseason project is the first replacement of the ballpark’s original surface, installed in the spring of 1999. New images from the team on Instagram show the process has begun to remove the grass in the outfield.

Update, Oct. 11: The Mariners added several new images.

Another busy day of work on the @safecofield playing surface yesterday. There goes the infield and up comes home plate. A post shared by Seattle Mariners (@mariners) on Oct 10, 2017 at 10:17am PDT

Come 2018, @safecofield will have a completely new playing surface for the first time in its history. Work starts today. A post shared by Seattle Mariners (@mariners) on Oct 5, 2017 at 11:08am PDT

The Mariners said in a news release that grass in the infield and foul territory was replaced in 2012, but with the exception of patches here and there, the outfield hasn’t been touched.

The maintenance — expected to last until the end of October — involves grinding and composting the turf and excavating a thick layer of sand. The area is then “laser leveled” and prepped for new grass with a “root zone” mixture of sand, peat and other amendments to help maintain airflow and moisture, according to the team.