"Hi Robert. Other members will I'm sure help but my suggestions are:-
As The wall is double faced the most logical method would be to build it entirely out of stone. It would be a very thick wall if you included a hidden inner wall of concrete…"
"Everyone above has mentioned the salient points but in summary you will get work from it and maybe like me some 'golden' contracts but it will drive you mad (weekly meetings, a fair amount of BS, generating referrals for other…"
"I have seen glyphosate kill marestail but it is very hard to get the chemical to be absorbed into the plant. You need to roll or harrow the marestail in order to bruise it first. Then it wants a strong dose of glyphosate with some adjuvant oil.It is…"
"You have a couple of options. The first is Roundup Pro Biactive 450, but this would kill any grass which is near by (unless you used a weed wiper).
The second option and probably the better of the two would be a product called broadshot. Broadshot…"