A few people have been scammed on the site, Only use paypal to pay for items for sale by other members. If they will not use paypal, its likely a scam NEVER SEND E-TRANSFERS OF ANY KIND.
In this area they put the sand that is dredged up. Let it lay there for years, i suppose to let the salt flush out. So where the rest of the region is old sea bed clay, this area has a sand off-road course, 4x4 track (now abandoned) and the unofficial "training" grounds were this picture is taken.