CATEGORY 200 GRADING SECTION 208 — SUBGRADE PREPARATION
208.01 Description
Prepare, protect, and maintain the subgrade prior to the construction of succeeding courses.
208.02 Materials
Refer to Section 916.
208.03 Construction
After roadway excavation and embankments are completed in conformance with Section 204, fine grade and compact the subgrade to at least 97 percent of the maximum dry density according to T 180.
208.03.01 Removal and Replacement of Unsuitable Material. Remove and dispose of all soft
and unstable material and any other portions of the subgrade that will not properly compact. Replace with suitable material and compact.
208.03.02 Subgrade Control. Bring the subgrade surface to line and grade and shape it to the
specified cross section. Set grade for subgrade control both longitudinally and transversely with fixed controls not exceeding 25 ft spacing. Limit the finish subgrade deviation to 1/2 in. from the established grade. Compact and smooth the subgrade over its full width by the use of an approved smooth faced, steel-wheeled roller approved by the Engineer. Use mechanical tampers and vibratory compactors if rolling is not feasible.
208.03.03 Bleeder Ditches. Maintain adequate open bleeder ditches along the subgrade at all
times to keep it thoroughly drained. Maintain erosion and sediment control practices as specified in Section 308.
208.03.04 Subgrade Maintenance. Prevent damage by heavy loads or equipment. Repair or
replace any defects or damage. 208.03.05 Subgrade Approval. Do not place subsequent cover material upon a frozen subgrade or any subgrade until it has been checked and approved. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
208.04 Measurement and Payment
but the cost will be incidental to the pertinent items specified in the Contract Documents. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS Subgrade preparation, including bleeder ditches and any mechanical tamping will not be measured 209 — TRIMMING EXISTING DITCHES 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS CATEGORY 200 GRADING SECTION 209 — TRIMMING EXISTING DITCHES
209.01 Description
Trim, slope, and shape existing ditches within the limits and to the lines and grades specified. Clearing and grubbing and the removal and disposal of surplus or unsuitable materials are included in the work.
209.02 Materials
Not applicable.
209.03 Construction
Clear and grub as specified in Section 101. Trim, slope, and shape existing ditches to a uniform grade and cross section. Maintain a constant side slope having a maximum slope of 1:1 unless otherwise specified. Dispose of excess and unsuitable materials as specified in Section 201.
209.04 Measurement and Payment
Trimming Existing Ditches will be measured and paid for at the Contract unit price per linear foot of trimmed ditch. Measurement will be along the center line of the ditch. The payment will be full compensation for all clearing, grubbing, excavation, disposal of surplus and unsuitable materials, and for all labor, equipment, tools, and incidentals necessary to complete the work.