STANDARD MSE WALL NOTES ON PLANS 2-16-10 (Instructions for use are in parenthesis after each note if applicable and choices are in parenthesis separated by "or".) FOR MECHANICALLY STABILIZED EARTH (MSE) RETAINING WALLS, SEE MECHANICALLY STABILIZED EARTH RETAINING WALLS PROVISION. FOR GUARDRAIL, SEE ROADWAY PLANS AND SECTION 862 OF THE STANDARD SPECIFICATIONS. FOR SINGLE FACED PRECAST CONCRETE BARRIER, SEE ROADWAY PLANS AND SECTION 857 OF THE STANDARD SPECIFICATIONS. A CONCRETE BARRIER RAIL WITH A MOMENT SLAB IS REQUIRED ABOVE RETAINING WALL NO. ____. SEE PLANS AND MSE RETAINING WALLS PROVISION FOR DETAILS OF A CONCRETE BARRIER RAIL WITH A MOMENT SLAB. (Structure Design will add a plan sheet for a concrete barrier rail with a moment slab to the wall plans when required.) A FENCE OR HAND RAIL IS REQUIRED ON TOP OF RETAINING WALL NO. ____. SEE ROADWAY PLANS FOR FENCE OR HAND RAIL ATTACHMENT DETAILS. DO NOT USE STANDARD SIZE NO. 2S OR 2MS FOR SELECT MATERIAL FOR RETAINING WALL NO. ____. (Use this note for critical walls as defined by the “NCDOT Policy for MSE Retaining Walls” or other situations when sand for select material is not allowed.) DO NOT USE AN MSE WALL SYSTEM WITH SEGMENTAL RETAINING WALL UNITS FOR RETAINING WALL NO. ____. (Use this note for critical walls as defined by the “NCDOT Policy for MSE Retaining Walls” or other situations when blocks for facing elements are not allowed.) USE AN MSE WALL SYSTEM WITH SEGMENTAL RETAINING WALL UNITS FOR RETAINING WALL NO. ____. WHEN USING AN MSE WALL SYSTEM WITH SEGMENTAL RETAINING WALL UNITS FOR RETAINING WALL NO. ____, FREEZE-THAW DURABLE SRW UNITS ARE REQUIRED IN ACCORDANCE WITH THE MSE RETAINING WALLS PROVISION. (Use this note for MSE walls with blocks exposed to repeated freeze-thaw conditions and significant deicing chemicals such as walls facing roads in urban areas and Divisions 11, 13 and 14.) CAST-IN-PLACE REINFORCED CONCRETE COPING IS REQUIRED FOR RETAINING WALL NO. ____. AN ____________ ARCHITECTURAL FINISH IS REQUIRED FOR FRONT FACES OF PRECAST CONCRETE PANELS FOR RETAINING WALL NO. ____. USE SEGMENTAL RETAINING WALL UNITS WITH A ____________ FACE FOR RETAINING WALL NO. ____. USE SEGMENTAL RETAINING WALL UNITS WITH A ____________ COLOR FOR RETAINING WALL NO. ____. A DRAIN (IS or IS NOT) REQUIRED FOR RETAINING WALL NO. ____. BEFORE BEGINNING MSE WALL DESIGN FOR RETAINING WALL NO. ____, SURVEY EXISTING GROUND ELEVATIONS SHOWN ON THE WALL PROFILE VIEW (WALL ENVELOPE) AND SUBMIT A REVISED WALL ENVELOPE FOR REVIEW. DO NOT START WALL DESIGN OR CONSTRUCTION UNTIL THIS ENVELOPE IS ACCEPTED. (Use this note when existing ground line is in the vicinity of wall elevations.) DESIGN RETAINING WALL NO. ____ FOR WALL HEIGHTS EQUAL TO THE DESIGN HEIGHT (DIFFERENCE BETWEEN GRADE ELEVATION AND BOTTOM OF WALL ELEVATION) PLUS EMBEDMENT (DIFFERENCE BETWEEN BOTTOM OF WALL ELEVATION AND TOP OF LEVELING PAD ELEVATION). DESIGN RETAINING WALL NO. ____ FOR THE FOLLOWING: 1) MINIMUM SERVICE LIFE = (75 or 100) YEARS 2) ALLOWABLE BEARING CAPACITY = ____ PSF (kPa) 3) MINIMUM REINFORCEMENT LENGTH = ____ FT (m) 4) MINIMUM EMBEDMENT ELEVATION = ____ FT (m) 5) SELECT MATERIAL PARAMETERS: MATERIAL STANDARD SIZE NO. UNIT WEIGHT FRICTION COHESION (c) (IN ACCORDANCE WITH (gamma) ANGLE (phi) PSF (kpa) SECTIONS 1005 AND 1014 OF PCF (kN/m3) DEGREES THE STANDARD SPECIFICATIONS) 2S AND 2MS 125 34 0 57, 67 AND 78M 110 38 0 6) IN-SITU ASSUMED MATERIAL PARAMETERS: MATERIAL TYPE UNIT WEIGHT FRICTION COHESION (c) (gamma) ANGLE (phi) PSF (kPa) PCF (kN/m3) DEGREES BACKFILL ___ __ ___ FOUNDATION ___ __ ___ (For minimum service life, use 100 years for critical walls as defined by the MSE wall policy and 75 years for all other MSE walls. Modify numbers 2 and 6 as necessary for variable wall heights and subsurface conditions. Numbers 3 and 4 are optional. Use No. 3 when required for global stability. Use No. 4 when more than the minimum embedment in accordance with the provision is necessary such as MSE walls subject to scour. Delete row for 2S and 2MS from table in No. 5 when sand for select material is not allowed.) THE MINIMUM EMBEDMENT ELEVATION FOR RETAINING WALL NO. ____ INCLUDES EMBEDMENT FOR SCOUR. DESIGN RETAINING WALL NO. ____ FOR A LIVE LOAD (TRAFFIC) SURCHARGE. DESIGN RETAINING WALL NO. ____ FOR THE (POINT, LINE or STRIP) SURCHARGE LOAD SHOWN. DESIGN RETAINING WALL NO. ____ FOR A PIPE EXTENDING THROUGH THE WALL AS SHOWN. VERIFY PIPE LOCATION AND ELEVATION BEFORE BEGINNING MSE WALL DESIGN OR CONSTRUCTION. DESIGN REINFORCEMENT CONNECTED TO END BENT CAPS FOR THE LOADING SHOWN AND CAST THE REINFORCEMENT CONNECTION HARDWARE INTO THE CAP BACKWALL FOR END BENT NO. ____ LOCATED AT STATION ____________. MAINTAIN A MINIMUM CLEARANCE OF 3” (75 mm) BETWEEN THE HARDWARE AND REINFORCING STEEL IN THE CAP. FOUNDATIONS FOR (OVERHEAD SIGNS, HIGH MOUNT LUMINAIRES or SIGNAL POLES) WILL BE LOCATED BEHIND RETAINING WALL NO. ____ AND (WILL or MAY) INTERFERE WITH REINFORCEMENT. BEFORE BEGINNING MSE WALL CONSTRUCTION, SUBMIT PROPOSED CONSTRUCTION METHODS FOR THESE FOUNDATIONS FOR APPROVAL. EXISTING OR FUTURE OBSTRUCTIONS SUCH AS FOUNDATIONS, GUARDRAIL POSTS, PAVEMENTS, PIPES, INLETS OR UTILITIES (WILL or MAY) INTERFERE WITH REINFORCEMENT FOR RETAINING WALL NO. ____. FOUNDATIONS FOR END BENT NO. ____ LOCATED AT STATION ____________ (WILL or MAY) INTERFERE WITH REINFORCEMENT FOR RETAINING WALL NO. ____. SEE “FOUNDATION LAYOUT” SHEET FOR FOUNDATION LOCATIONS. COMPLETE MSE WALL CONSTRUCTION FOR RETAINING WALL NO. ____ BEFORE INSTALLING FOUNDATIONS FOR END BENT NO. ____ LOCATED AT STATION ____________. DO NOT PLACE LEVELING PAD CONCRETE, SELECT MATERIAL OR REINFORCEMENT FOR RETAINING WALL NO. ____ UNTIL OBTAINING APPROVAL OF THE EXCAVATION DEPTH AND FOUNDATION MATERIAL. “TEMPORARY SHORING” (IS or MAY BE) REQUIRED FOR RETAINING WALL NO. ____ IN ACCORDANCE WITH THE TEMPORARY SHORING PROVISION. SEE (ROADWAY, STRUCTURE or TRAFFIC CONTROL) PLANS. AT THE CONTRACTOR'S OPTION, “TEMPORARY SHORING FOR WALL CONSTRUCTION” MAY BE USED TO CONSTRUCT RETAINING WALL NO. ____. SEE MSE RETAINING WALLS PROVISION FOR TEMPORARY SHORING FOR WALL CONSTRUCTION. (Use this note when temporary shoring is not shown on the plans or required by the Engineer but may be used for OSHA reasons or the Contractor's convenience. For example, when constructing an MSE wall in a cut and traffic is diverted away or the location is a new alignment, the Contractor may choose to use temporary shoring for wall construction in lieu of temporary slopes to excavate for the wall.)