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PART 1: GENERAL 1.01 DESCRIPTION A. THE WORK TO BE PERFORMED INCLUDES SOURCING, PROVIDING AND INSTALLING NATURAL STONE RETAINING WALL BOULDERS TO THE LINES AND GRADES AS SPECIFIED ON THE PROJECT CONSTRUCTION DRAWINGS AND AS MAY BE FURTHER SPECIFIED HEREIN. B. WORK INCLUDES PREPARING FOUNDATION SOIL, DRAINAGE AGGREGATE, AND BACKFILL TO THE LINES AND GRADES SHOWN ON THE CONSTRUCTION DRAWINGS. C. WORK INCLUDES FURNISHING AND INSTALLING ALL RELATED MATERIALS REQUIRED FOR CONSTRUCTION OF THE RETAINING WALL AS SHOWN ON THE CONSTRUCTION SHOP DRAWINGS. 1.02 REFERENCE STANDARDS A. ASTM D448 SIZES OF AGGREGATE FOR ROAD AND BRIDGE CONSTRUCTION. B. ASTM D698 LABORATORY COMPACTION CHARACTERISTICS USING STANDARD EFFORT. 1.03 QUALITY ASSURANCE A. OWNER SHALL BE RESPONSIBLE FOR SOIL TESTING AND INSPECTION QUALITY CONTROL DURING EARTHWORK OPERATIONS. 1.04 DESIGN SAFETY FACTORS A. THE BOULDER WALLS ARE DESIGNED AS GRAVITY WALLS: MINIMUM SAFETY FACTOR FOR OVERTURNING 2.0 MINIMUM SAFETY FACTOR FOR SLIDING 1.5 MINIMUM SAFETY FACTOR FOR BEARING 2.0 MINIMUM SAFETY FACTOR FOR GLOBAL STABILITY_1.5 PART 2: MATERIALS 2.01 DEFINITIONS A. DRAINAGE AGGREGATE - CLEAN 1" CRUSHED ANGULAR ROCK OR WASHED SELECT GRANULAR LOCATED WITHIN AND IMMEDIATELY BEHIND THE RETAINING WALL UNITS TO FACILITATE DRAINAGE. B. FOUNDATION SOIL - SOIL ZONE IMMEDIATELY BENEATH THE FIRST COURSE OF RETAINING WALL BOULDERS. C. RETAINED SOIL - SOIL IMMEDIATELY BEHIND THE RETAINING WALL FACING DRAINAGE AGGREGATE OR REINFORCED BACKFILL IF PRESENT. D. FILTER FABRIC - NONWOVEN GEOTEXTILE FABRIC PLACED IMMEDIATELY BEHIND THE BOULDERS AND IN FRONT OF THE DRAINAGE AGGREGATE. E. SUBSURFACE DRAINAGE SYSTEM - A SYSTEM FOR REMOVING WATER FROM BEHIND THE WALL AND CHANNELING IT TO A POINT OF POSITIVE DRAINAGE. 2.02 NATURAL STONE RETAINING WALL BOULDERS A. BOULDER TYPE SHALL BE SPECIFIED. CIVILDESIGN PROFESSIONALS SW9 LYNDALE AVENUE SOUTH, SUITE 200 BLOOMINGTON, MN 55420 PHONE: (952) 303,5312 1 WEBSITE: W W W.CDP.US.COM srresotunory raoeessloNAl.s, INC. I -A. crv" DESIGN eaoerssloN-S 2.03 FILTER FABRIC A. FILTER FABRIC SHALL CONSIST OF AN 8 OZ. NONWOVEN GEOTEXTILE. MIRAFI 180N OR AN APPROVED EQUIVALENT SHALL BE PLACED BEHIND BOULDERS AND WRAPPED AROUND ALL CLEAN 1" CRUSHED STONE BACKFILL. 2.04 DRAINAGE AGGREGATE (PHI 40°) A. AGGREGATE SHALL CONSIST OF CLEAN 1" CRUSHED STONE OR CLEAN WASHED SELECT GRANUALR MEETING THE FOLLOWING GRADATION: SIEVE SIZE % PASSING 11' 100 3/4" 100 - 75 N0.4 0 - 10 NO.50 0.5 2.05 BACKFILL A. RETAINED BACKFILL (SAND MINIMUM PHI 33") SHALL BE FREE OF DEBRIS OR ORGANIC MATERIAL MEETING THE FOLLOWING GRADATION: SIEVE SIZE % PASSING 2" 100 3/4" 100.75 NO.4 20. 100 NO.40 0.60 NO.200 0.25 PLASTICITY INDEX (PI)<10 B. THE MAXIMUM AGGREGATE SIZE SHALL BE LIMITED TO 2" UNLESS FIELD TESTS HAVE BEEN PERFORMED TO EVALUATE POTENTIAL STRENGTH REDUCTION TO INSTALLATION. C. MATERIAL CAN BE SITE EXCAVATED MATERIAL WHEN THE ABOVE REQUIREMENTS ARE MET. UNSUITABLE SOILS FOR BACKFILL (HIGH PLASTIC CLAYS OR ORGANIC MATERIALS) SHALL NOT BE USED IN THE REINFORCED SOIL MASS. D. REINFORCED FILL SAMPLES AND TEST RESULTS SHALL BE SUBMITTED TO THE ARCHITECT/ENGINEER FOR APPROVAL PRIOR TO CONSTRUCTION. 2.06 SUBSURFACE DRAINAGE SYSTEM A. SUBSURFACE DRAINAGE SYSTEM SHALL CONSIST OF PERFORATED POLYETHYLENE (PE) PIPE WRAPPED IN A GEOTEXTILE FABRIC OR NON -PERFORATED WHERE REQUIRED. B. NON -PERFORATED PIPE SHALL BE USED TO CONNECT DRAINS FROM THE WALL TO DRAINAGE STRUCTURES OR HEADWALLS. C. FITTINGS SHALL BE PER MANUFACTURER'S RECOMMENDATIONS. No. Date Revision By 1 10/26/18 REVIEW COMMENTS JVZ 2 3 4 5 6 PART 3: EXECUTION 3.01 EXCAVATION A. CONTRACTOR SHALL EXCAVATE TO THE LINES AND GRADES SHOWN ON THE CONSTRUCTION DRAWINGS. CONTRACTOR SHALL BE CAREFUL NOT TO DISTURB EMBANKMENT AND FOUNDATION MATERIALS BEYOND LINES SHOWN. 3.02 FOUNDATION SOIL PREPARATION A. FOUNDATION SOIL SHALL BE EXCAVATED AS REQUIRED FOR LEVELING PAD DIMENSIONS SHOWN ON THE CONSTRUCTION DRAWINGS, OR AS DIRECTED BY THE GEOTECHNICAL ENGINEER. B. UNSUITABLE SOILS SHALL BE REMOVED AND REPLACED WITH ACCEPTABLE MATERIAL. C. OVER -EXCAVATED AREAS SHALL BE BACKFILLED WITH APPROVED COMPACTED BACKFILL MATERIAL. 3.03 BOULDER INSTALLATION A. THE WALL EMBEDMENT SHALL BE A MINIMUM OF 4.0' AS SHOWN ON THE WALL PROFILE. B. BOULDERS ARE PLACED SIDE BY SIDE FOR FULL LENGTH OF WALL ALIGNMENT. ALIGNMENT MAY BE DONE BY MEANS OF A STRING LINE OR OFFSET FROM A BASE LINE. C. ENSURE THAT EACH COURSE IS COMPLETELY BACKFILLED AND COMPACTED PRIOR TO PROCEEDING TO NEXT COURSE. D. THE BOULDERS SHALL BE PLACED TO AVOID CONTINUOUS JOINT PLANES IN VERTICAL OR LATERAL DIRECTIONS. EACH BOULDER SHALL BEAR ON TWO OR MORE ROCKS BELOW IT, WITH GOOD FLAT -TO -FLAT CONTACT. 3.04 FILL PLACEMENT (PER THIS SPECIFICATION OR THE GEOTECHNICAL REPORT, WHICHEVER IS MORE STRINGENT) A. BACKFILL MATERIAL SHALL BE PLACED WITH A MAXIMUM OF 8" LIFTS AND COMPACTED TO 98% OF STANDARD PROCTOR DENSITY. AS DETERMINED IN ACCORDANCE WITH ASTM D698. THE IN PLACE MOISTURE CONTENT SHALL NOT EXCEED THE OPTIMUM MOISTURE CONTENT AS DETERMINED IN ACCORDANCE WITH ASTM D698 AND BE NO LOWER THAN 2% BELOW OPTIMUM MOISTURE CONTENT. B. CRUSHED STONE BACKFILL COMPACTION REQUIREMENTS: 1. CRUSHED STONE BACKFILL SHALL BE PLACED IN UNIFORM MAXIMUM LIFTS OF 9". 2. THE CRUSHED STONE BACKFILL SHALL BE COMPACTED BY A MINIMUM OF 3 PASSES OF A VIBRATORY COMPACTOR CAPABLE OF EXERTING 2,000 LBS OF CENTRIFUGAL FORCE AND TO THE SATISFACTION OF THE ONSITE GEOTECHNICAL ENGINEER OR THEIR DESIGNATED REPRESENTATIVE. C. ONLY HAND -OPERATED COMPACTION EQUIPMENT SHALL BE ALLOWED WITHIN T OF THE BACK SURFACE OF THE BOULDERS. Designed By: Project: Registration No: JVZ ONEKA PARKWAY NORTH HUGO, MINNESOTA 25493 Scale: Project No: N.T.S. 18.0610 Title: SPECIFICATIONS Date: 3heetN°: JUL 26, zols 3.00 I hereby certify that this pl , spioification, or report was prepared by me or under y dire t pe 'n and that 1 am a duly Licensed Professional ngi r laws of the State of Minnesota. Date: Iv/ N/ 0 MICHAEL R. JOHNS N, P.E.