Architex-------That sounds like a GREAT thing to do & something more of us should probably do.------Make sure the city council is aware of it though.----That lady that issues the permits may be no more than a "pencil pusher" that hits the delete button.
Judging from your pic, and based on my park experience, I'd say it could be more like 20 to 1 if you're looking for gold. I try to make my trash removal known - in my parks you have to have a permit. I'm saving all my park trash and at the end of the season I'm going to spread it all out on the driveway, take a pic, and email the pic to the lady who issues the permits. Can't hurt, right?
Are you guys serious ? Sending pictures, of scores of junk dug from the city park, to city hall ? That seems like the FASTEST way to get someone there (who perhaps never gave the matter a moment's thought) thinking of "Gee, .... do we really want all these yahoos digging up the park ?"
Stop and think for a minute guys : You guys seem to think that desk-bound bureaucrats would somehow be happy that md'rs are "cleaning up the park". But do you think they're stupid ? Do you think they don't know that that foil, or pulltab etc..., wasn't buried and not a harm to anyone ? It was invisible, buried, and thus not an issue.
The only thing you're going to do, with waving the word "metal detector" in front of them, is to conjure up images of geeks with shovels.
And if you think "But this city already issues a permit, hence they're already aware of it" : You would be surprised at how often the rank & file at city hall, who would be receiving such a letter/picture such as this, .... have no idea about "permits" issued for this. For example: There's a city here in CA that.... yes .... had dreamed up a "permit" decades ago. They just let the local club issue them, and the club sends a 1x per year check to the city. But one local fellow didn't want to join the club (couldn't coordinate his schedule with the club meeting times or whatever). So he thought he could just go to city hall and get one himself. He got shunted to 10 different desks, as people there simply didn't know what he was talking about.
So ... please .... Stop thinking that the more-attention to us is the better. On the contrary, the LESS attention to us is the better. Stop swatting hornet's nests.
I understand your feelings because you live in a basically communist state. Not quite that bad here - yet. Actually, the permit lady referred me to someone who lost a platinum earring and they paid me to find it. So our bureaucrats are not quite so bad. And the park maintenance people are very nice and don't really care if you follow most of the rules (just don't show up with a shovel of course.). Maybe you should move here.