Here's 4 places in Leonardtown to call.
AAA Materials
42707 Saint Andrews Church
Leonardtown, MD 20650-4012
Phone: (301) 475-2939
Business Types: Crushed Stone & Rock, Material Handling Equipment, Sand Gravel & Aggregate
Maryland Rock Industries-Breton Bay Plant
Breton Beach Road
Leonardtown, MD 20650
Phone: (301) 475-3003
Business Types: Sand Gravel & Aggregate
Sloan Materials
40840 Parsons Mill Road
Leonardtown, MD 20650
Phone: (301) 475-3651
Business Types: Crushed Stone & Rock, Sand Gravel & Aggregate
Sloan Randal
Leonardtown, MD 20650
Phone: (301) 475-3651
Business Types: Crushed Stone & Rock, Sand Gravel & Aggregate
The AAA Materials, I think, is the one just up from the Willows Apartments. When you call tell them your dimensions and depth, they should be able to tell you how much you need. I'd be interested in what you find out for pricing. tks!