122 716.1.1.2, that can be satisfactorily com pacted to a stable condition. The tolerance set forth in section 207.9.1 shall apply. Excavation made below this six (6) inches limit in cut sections will not be paid for, except, when unsuitable material is removed as specified below, payment will be made for removal to an additional depth of twelve ( 12) inches of this unsuitable material with the actual locations and depth of removal established by or acceptable to the Engineer. The subgrade layer or layers shall be moistened or dried to a uniform mois ture content suitable for maximum compaction and brought to a firm unyielding condition by compaction. The subgrade shall be uniformly compacted to the applicable requirements specified in 716. Reclaimed asphalt pavement (RAP) may be used for subgrade. The top size of gradation shall not exceed three ( 3) inches and shall be placed in accordance with Sections 207 and 716.2. Approval for gradation shall be by visual inspection by the Engineer. The surface of the subgrade shall be maintained in such condi tion that it will drain at all times. When trenching is done for narrow base widening, ditches of an adequate depth shall be constructed across the shoulders at sufficient intervals to permit a free outlet of water. Equipment or vehicles shall not be all owed to travel in a single track and form ruts in the subgrade. Any ruts or irregularities formed in the subgrade shall be scarified and recompacted. When the construction of a base, pavement, or surface is included in the Contract, or is so provided on the Plans, the profile grade of the subgrade shall be such that the specified thickness of the base course, pavement and surface will be obtained within limits of final surface grade. Any grade revision necessitated shall be called to the atte ntion of the Engineer. When unsuitable material is encountered at the subgrade elevation, it shall be removed to a depth of twelve ( 12) inches and replaced with suitable material. When so designated, engineering fabric for subgrade stabilization, conform ing to 715.11, shall be installed over the area which shall be relatively smooth, free of sharp protrusion, depressions or debris. The fabric shall be placed with the machine direction of the fabric parallel with the alignment and shall be relatively smoo th and free from creases. The joining of fabrics shall be accomplished by sewing (either in the field by portable sewing machine or during manufacture of the fabric) as outlined in 715.11.3 or shall be installed so any splice joints have a minimum overlap of three ( 3) feet or as directed by the Engineer. Once the fabric is placed, cover material shall be brought to the working face, dumped and spread with equipment exerting the minimum ground pressure possible. Construction equipment shall not operate directly on the fabric. A minimum of six (6) inches of cover material shall be maintained between the construction equipment and the fabric. Compaction shall be accomplished by conventional methods after the cover material is spread. Sheepsfoot rollers will not be permitted. The completed subgrade shall present a uniform appearance and shall be checked for conformity to the lines, grades, and dimensions shown on the Plans. When the Plans require engineering fabric for subsurface drainage or sep aration, the material shall conform to subsection 715.11 and be placed as fabric for stabilization except the fabric may be joined by overlapping so the splice joints have a two foot minimum overlap. Construction equipment is permitted on the fabric provi ded all damage is repaired as specified in subsection 715.11.3. When the fabric is placed in structure backfill applications, such as bridge abutments, the orientation of the fabric will be directed by the Engineer. 207.9.1 -Tolerance: The completed su rface shall not vary more than ½ inch above or below plan grade. Deviations shall be corrected by scarifying, adding additional approved aggregate if necessary, and recompacting. 123 The subbase course shall be checked for proper thickness after final compa ction. The Contractor shall refill all test holes with approved material and adequately recompact the material. Any deficiency in total thickness of the subbase in excess of one ( 1) inch shall be corrected.
207.10 Shoulders :
Before any base or pavement may be placed upon the subgrade, the shoulders along and adjacent thereto shall be built to the dimensions shown on the cross section. In order to provide adequate side support for macadam or other ston e types of base or surface, shoulders shall be constructed full width, substantially to line and grade and to the depth of the course being constructed, and compacted with at least a 10 ton roller, and then trimmed to the required line. When concrete base or pavement is being constructed, or where the shoulders are to be built of stabilized material, these requirements may be waived by the Engineer. Upon completion of the base, pavement, or surfacing, the shoulders shall be finally shaped, dressed, and compacted to conform to the dimensions shown on the Plans. No stone exceeding three ( 3) inches in maximum dimension will be permitted within 3 inches of the surface. The outer edge of the shoulder shall be trimmed to a neat line parallel with the centerline of the roadway, and the entire surface rolled to within twelve ( 12) inches of the ou tside edge, refilling and rerolling any depressions that develop. Ditches and back slopes shall be finally cleaned and trimmed to line upon completion of the shoulder work. The in -place density of shoulders shall be as specified for the subgrade in Secti on 716.
207.11 Drainage :
When grading, subgrading, constructing shoulders, or placing base or pavement is suspended because of unsuitable weather or any other reason, suitable provisions shall be made to drain the grade, subgrade or shoulders by means of the construction of adequate side ditches and drains. The ditches and drains shall be kept open and maintained during the period of suspension, including the removal of slides. Upon failure of the Contra ctor to construct and maintain the temporary drains prior to the acceptance of the work, the Engineer may cause such work to be done by others, and the cost will be deducted from moneys due the Contractor. Upon completion of the subgrade or shoulders and before any base on pavement is placed, subgrade drains or weeps shall be placed as shown on the Plans or as directed by the Engineer in accordance with Section 606.
207.12 Temporary Surcharge :
When shown on the Plans or directed by the Engineer, a temporary surcharge composed of suitable compacted material from the "Unclassified Excavation" or "Unclassified Borrow Excavation" shall be placed after completion of the embankment to the elevations o f the base of the subgrade. The temporary surcharge shall be placed in accordance with location limits and elevations shown on the Plans or as directed by the Engineer. Surcharge material shall be placed in accordance with the provisions of 207.7. The f irst five ( 5) feet of the surcharge shall be compacted as specified for embankment in the applicable provisions of 716. The remaining surcharge shall be compacted as specified above except that the target percentage of dry density shall be 90 percent (90% ). The surcharge shall be maintained for the period indicated on the Plans or directed by the Engineer.