STANDARD MSE RETAINING WALL NOTES ON PLANS 12-18-07 (Choices are in italics and retaining wall no. is optional if there is only one wall.) FOR MECHANICALLY STABILIZED EARTH (MSE) RETAINING WALLS, SEE MECHANICALLY STABILIZED EARTH RETAINING WALLS SPECIAL 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. CONCRETE BARRIER RAIL COPING WITH A MOMENT SLAB IS REQUIRED FOR RETAINING WALL NO. ____ AS SHOWN. NO SEPARATE PAYMENT WILL BE MADE FOR CONCRETE BARRIER RAIL COPING WITH A MOMENT SLAB. PAYMENT WILL BE CONSIDERED INCIDENTAL TO THE COST OF THE MSE RETAINING WALL. DO NOT USE STANDARD SIZE NO. 2S OR 2MS FOR WALL BACKFILL 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 wall backfill 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 (SRW) UNITS FOR RETAINING WALL NO. ____, FREEZE-THAW DURABLE SRW UNITS ARE REQUIRED IN ACCORDANCE WITH THE MSE RETAINING WALLS SPECIAL PROVISION. (Use this note for MSE walls with blocks exposed to significant deicing chemicals such as walls facing roads in urban areas and Divisions 11, 13 and 14.) CAST-IN-PLACE CONCRETE COPING IS REQUIRED FOR RETAINING WALL NO. ____. A ____________ ARCHITECTURAL FINISH IS REQUIRED ON THE FRONT FACE OF THE PRECAST CONCRETE PANELS FOR RETAINING WALL NO. ____. A ____________ FINISH IS REQUIRED ON THE FRONT FACE OF SEGMENTAL RETAINING WALL UNITS FOR RETAINING WALL NO. ____. USE SEGMENTAL RETAINING WALL (SRW) UNITS WITH A ____________ COLOR FOR RETAINING WALL NO. ____. SUBMIT COLORED SRW UNIT SAMPLES FOR ACCEPTANCE BEFORE BEGINNING UNIT PRODUCTION. A FENCE OR HAND RAIL IS REQUIRED ON TOP OF RETAINING WALL NO. ____ AS SHOWN. USE SLEEVES IN ACCORDANCE WITH SECTION 866 OF THE STANDARD SPECIFICATIONS FOR POSTS OR SUBMIT POST ANCHOR PLATE DETAILS TO THE ENGINEER FOR APPROVAL. BEFORE BEGINNING MSE WALL DESIGN FOR RETAINING WALL NO. ____, SURVEY ALL EXISTING GROUND ELEVATIONS SHOWN ON THE PLANS AND SUBMIT A REVISED WALL ENVELOPE FOR REVIEW. DO NOT START WALL DESIGN OR CONSTRUCTION UNTIL THIS ENVELOPE IS ACCEPTED. DESIGN RETAINING WALL NO. ____ FOR A WALL HEIGHT 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) WALL BACKFILL MATERIAL PARAMETERS: MATERIAL STANDARD SIZE NO. UNIT FRICTION COHESION (IN ACCORDANCE WITH WEIGHT ANGLE (c) SECTIONS 1005 AND 1014 OF (gamma) (phi) PSF(kPa) THE STANDARD SPECIFICATIONS) PCF (kN/m3) DEGREES 2S AND 2MS* 125 34 0 57, 67 AND 78M 110 38 0 6) IN-SITU ASSUMED MATERIAL PARAMETERS: MATERIAL TYPE UNIT FRICTION COHESION WEIGHT ANGLE (c) (gamma) (phi) PSF(kPa) PCF (kN/m3) DEGREES RETAINED AND RANDOM ____ ____ ____ BACKFILL FOUNDATION ____ ____ ____ *(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 AASHTO is necessary such as MSE walls subject to scour. Delete row for 2S and 2MS from table in No. 5 when sand for wall backfill 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. SUBMIT PROPOSED CONSTRUCTION METHODS FOR THESE FOUNDATIONS WITH THE MSE WALL INSTALLATION SUBMITTAL. 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, WALL BACKFILL OR FIRST REINFORCEMENT LAYER 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 SPECIAL PROVISION. SEE (ROADWAY, STRUCTURE or TRAFFIC CONTROL) PLANS. “TEMPORARY SHORING FOR WALL CONSTRUCTION” (IS or MAY BE) REQUIRED FOR RETAINING WALL NO. ____. FOR TEMPORARY SHORING FOR WALL CONSTRUCTION, SUBMIT WORKING DRAWINGS AND DESIGN CALCULATIONS WITH THE MSE WALL DESIGN SUBMITTAL AND DESIGN AND CONSTRUCT THE SHORING IN ACCORDANCE WITH THE TEMPORARY SHORING SPECIAL PROVISION. NO SEPARATE PAYMENT WILL BE MADE FOR TEMPORARY SHORING FOR WALL CONSTRUCTION. PAYMENT WILL BE CONSIDERED INCIDENTAL TO THE COST OF THE RETAINING WALL.