There's a proposal to create two skateparks in South Liverpool - one at Otterspool and one at Dingle Bank in Garston.
The Otterspool application is now open for comments with all the plans and other paperwork on line The deadline is 1 October and you can see the info at this link. (Please bear in mind that the bulk of the info is in a bit called Related Documents - scroll down and click)
The Dingle Bank paperwork isn't on line yet. When it is, you should find it at this link.
UPDATE: Dingle Bank paperwork is now in and the comments section is open.