FLOOR STEEL REQUIREMENTS The Maryland Conservation Practice Standard, code 313, Waste Storage Facility requiresthe required area of such reinforcing steel shall be based on subgrade drag theory as discussed inindustry guidelines such as American Concrete Institute, ACI 360, ‘Design of Slabs-on-Grade’.” Required steel is shown in the Table below. CONCRETE STORAGE FACILITIESMAXIMUM REQUIRED STEEL FLOOR FOR 5" THICK FLOOR W/ GRAVEL SUBGRADEDIMENSION AEXAMPLE< 60' 0.058 6x6-#6 gage, or 6x6-W2.9xW2.9, or #3 bar @ 18 inch Design Guide MD#2 Circular Concrete Storage FacilitiesNRCS Engineering, MarylandDecember, 2004 s >60’ < 100' 0.126 4x4-#4 gage,4x4-W4xW4, or #4 @ 18">100' < 160' 0.190 #4 @ 12">160' < 200' 0.230 #4 @ 10" or #5 bar @ 16” WALL EXTENSIONS