III. TECHNICAL SPECIFICATIONS

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1 Glen Lyn Pedestrian Riverfront Access Phase 2 VDOT Project No. : EN , C502 UPC #: Federal #: TEA (030) III. TECHNICAL SPECIFICATIONS Section Summary of Work 2 Section Submittal Procedures 3 Section Testing and Inspecting Services 2 Section Product Delivery, Storage, and Handling Requirements 1 Section Demolition 6 Section Cast in Place Concrete 13 Section Earthwork 8 Section Site Clearing 4 Section Excavation and Fill 5 Section Trenching and Backfilling 7 Section Erosion and Sedimentation Controls 7 Section Geosynthetic Soil Reinforcement 3 Section Base, Ballasts, Pavements, and Appurtenances 9 Section Segmental Retaining Walls 5 Section Steel Railing 3 Section Topsoil Placement and Grading 2 Section Seeding 5 Section Utility Pipe and Materials 6 Section Storm Drainage Utilities 3

72 Glen Lyn Pedestrian Riverfront Access Phase 2 (JN ) 05/29/2014 SECTION SEGMENTAL RETAINING WALLS PART 1 GENERAL 1.1 DESCRIPTION 1. Work Included: Furnish and install segmental retaining wall (SRW) units and caps to the lines and grades designated on the construction plans or as directed by the ENGINEER. Also included is furnishing and installing appurtenant materials required for construction of the retaining wall as shown on the construction plans. Work includes design and submittal of sealed engineering plans and calculations, preparation and payment of building permits, preparation of foundation soils, installation of leveling pad, MSE retaining walls, drainage, drain pipe, and reinforced backfill; including all excavation, removal/relocation of existing drains and structures encountered, disposal of surplus or unsuitable material, unit drainage fill, select backfill, geogrid, compaction, testing, clearing and grubbing, restoration of property, seeding, and appurtenances. Work also includes furnishing and installing soil reinforcement of type, size, location, and lengths as designated by the required engineered plans by the CONTRACTOR. Coordination will be required for installation of the proposed railing along the walls. 1.2 RELATED WORK 1. Related Sections: Additional Sections of the Documents which are referenced in this Section include: 1) Section Earthwork 2) Section Geosynthetic Soil Reinforcement 3) Section Bases, Ballasts, and Paving 1.3 REFERENCES 1. General: The work shall comply with the most recent standards or tentative standards as published at the date of the contract and as listed in this specification using the abbreviation shown. 2. American Society for Testing and Materials (ASTM): 1) C90 Standard Specification for Loadbearing Concrete Masonry Units 2) C140 Standard Test Methods of Sampling and Testing Concrete Masonry Units and Related Units 3) D698 Standard Test Method for Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ftlbf/ft 3 ) (600kN-m/m 3 ) 4) D1557 Standard Test Method for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ftlbf/ft 3 ) (2,700 kn-m/m 3 ) 5) D6638 Standard Test Method for Determining Connection Strength Between Geosynthetic Reinforcement and Segmental Concrete Units (Modular Concrete Blocks) 3. National Concrete Masonry Association (NCMA): \\aaprojects\projects\28\28182\ _engineering\contract_documents\tech_specs\32_32_23_segmental_retaining_walls.doc Segmental Retaining Walls Page

73 Glen Lyn Pedestrian Riverfront Access Phase 2 (JN ) 05/29/2014 1) Design Manual for Segmental Retaining Walls (Second Edition). 4. Where specifications and reference documents conflict, the ENGINEER shall make the final determination of applicable document. 1.4 Certification 1. General: CONTRACTOR Shall submit a notarized manufacturer's certification prior to start of work stating that the SRW units meet the requirements of this specification. 2. Prior to start of work, the CONTRACTOR shall submit construction drawings and design calculations prepared and stamped by a Professional Engineer registered in the state of Virginia for the proposed retaining wall system based on the selected retaining wall manufacturer. 1.5 DELIVERY, STORAGE AND HANDLING 1. General: CONTRACTOR Shall Check the materials upon delivery to assure that specified type, grade, color and texture of SRW units has been received. Prevent excessive mud, wet concrete, epoxies, and like materials which may affix themselves, from coming in contact with the materials. 2. Damage: CONTRACTOR Shall Protect the materials from damage. Damaged material shall not be incorporated into the reinforced soil wall. 1.6 QUALITY ASSURANCE 1. The CONTRACTOR shall be competent and experienced in the construction of reinforced segmental retaining walls. The CONTRACTOR S competency and experience shall be determined by the OWNER thru demonstration of successfully completed projects and/or completion of a nationally recognized course of instruction, such as the NCMA s Segmental Retaining Wall Installers Education Program. 2. The Design Engineer shall be competent and experienced in the design and analysis of reinforced segmental retaining walls. The Design Engineer shall provide proof of current professional liability insurance with an aggregate coverage limit of not less than $1,000, The CONTRACTOR shall provide independent soil testing and quality assurance inspection and testing during earthwork and wall construction operations. 1.7 MEASUREMENT AND PAYMENT 1. Measurement: of the SRW units is on a vertical square foot basis. 2. Payment: shall cover supply and installation of SRW units along with appurtenant and incidental materials required for construction of the retaining wall as shown on the construction plans. It shall include all compensation for engineering, labor, materials, supplies, equipment and permits associated with building these walls. 3. Quantity: of retaining wall as shown on plans and Bid Form does not include required stepping of the wall as it transverses grade changes. Contractor shall factor any additional block required into the bid unit price for the quantity as shown on the bid form. 4. Acceptance: The accepted quantities of SRW units will be paid for per vertical square foot per plan measurement (total wall height). Payment will be made under: Pay Item MSE Retaining Wall Pay Unit Square Feet. \\aaprojects\projects\28\28182\ _engineering\contract_documents\tech_specs\32_32_23_segmental_retaining_walls.doc Segmental Retaining Walls Page

74 Glen Lyn Pedestrian Riverfront Access Phase 2 (JN ) 05/29/2014 PART 2 MATERIALS 2.1 SEGMENTAL RETAINING WALL UNITS 1. Segmental Retaining Wall: Units shall be VERSA-LOK Square Foot or approved equal. 2. Architectural Requirements: SRW units shall meet the following Architectural requirements: 1) Color of SRW units shall be determined by OWNER. 2) Finish of SRW units shall be split face. 3) SRW unit faces shall be of straight geometry. 4) SRW unit shall have a maximum height of 6 inches 5) SRW units shall be capable of being erected with a variable bond configuration. Bond should vary between 1/4 to 3/4 bond. 6) All SRW units shall be sound and free of cracks or other defects that would interfere with the proper placing of the unit or significantly impair the strength or permanence of the construction. Cracking or excessive chipping may be grounds for rejection. Units showing cracks larger that 1/2 inch when measured along their length shall not be used within the wall. Units showing chips visible at a distance of 30 feet from the wall shall not be used within the wall. 3. Structural Requirements: SRW units shall meet the following structural requirements: 1) The SRW units shall be solid through the full depth of the unit. 2) For constructability considerations, the SRW units shall provide a minimum weight of 125 psf of wall face area. 3) Concrete used to manufacture SRW units shall have a minimum 28 days compressive strength of 3000 psi in accordance with ASTM C90 and C140. The concrete shall have adequate freeze/thaw protection with a maximum moisture absorption rate, by weight of 8 percent. Compressive strength test specimens shall conform to the saw-cut coupon provisions of Section of ASTM C140 with the following exception: Coupon shall be taken from the least dimension of the unit of a size and shape representing the geometry of the unit as a whole. 4) SRW units molded dimensions shall not differ more than +/- 1/8 inch from that specified, except height which shall be +/- 1/16 inch. 4. Constructability and Geometric Requirements: SRW units shall meet the following constructability and geometric requirements: 1) Units shall be capable of attaining concave and convex curves and 90 to 140 degrees inside corners and 25 to 90 degree outside corners. 2) Units shall provide a 3/4 inch horizontal setback per 6 inch-high course (a cant of 7 degrees from vertical). The installed wall cant shall not differ more than +/- 2 degrees from that specified. 2.2 SEGMENTAL RETAINING WALL UNIT INTERLOCKING DEVICES 1. General: Unit shall be positively engaged to the unit below with connection pins. \\aaprojects\projects\28\28182\ _engineering\contract_documents\tech_specs\32_32_23_segmental_retaining_walls.doc Segmental Retaining Walls Page

75 Glen Lyn Pedestrian Riverfront Access Phase 2 (JN ) 05/29/ LEVELING PAD 1. Material: for leveling pad shall consist of compacted sand or gravel or low strength unreinforced concrete and shall be a minimum of 6 inches in depth. The leveling pad should extend laterally at least a distance of 6 inches beyond the toe and heel of the lower most SRW unit. 2. Mechanical Vibrations: Do not run mechanical vibrating plate compactors on top of the units. Compact fill between units by running hand-operated compaction equipment just behind unit. Compact to minimum 95 percent of maximum density as measured by ASTM D DRAINAGE AGGREGATE 1. Drainage Fill Materials: shall be the free draining gravel, see Section Bases, Ballasts and Paving. 2. Vertical Drainage: layer behind the wall face shall be placed no less than 1 foot horizontal per 1 foot of wall face. 2.5 RETAINED BACKFILL OR COMMON BACKWALL 1. Soil: Soil placed behind the reinforced backfill can be any inorganic soil with a liquid limit less than 50 and plasticity index less than 30, or as directed by the ENGINEER. 2.6 REINFORCED BACKFILL - (INFILL SOIL) 1. Reinforced Backfill Material: The reinforced backfill material shall be free of debris and consist of either of the following inorganic soil types according to their USCS designations (GP, GW, SW, SP, SM, ML, CL). The maximum particle size shall be 4 inches. There shall be less than 20 percent by weight of particles greater than 1 1/2 inches, maximum 60 percent by weight passing the #200 sieve and PI< Backfill Compaction: The reinforced backfill shall be compacted in maximum 8 inch-thick compacted lifts to a minimum density of 95 percent of the maximum Standard Proctor Density (ASTM D698). 3. Geosynthetic Reinforcement: Reinforcement shall be in accordance with Section Geosynthetic Soil Reinforcement. 2.7 RETAINED BACKFILL OR COMMON BACKFILL 1. Soil: Soil placed behind the reinforced backfill can be any inorganic soil with a liquid limit less than 50 and plasticity index less than 30, or as directed by the ENGINEER. 2. Retained Backfill: shall be compacted to a minimum 90 percent maximum Standard Proctor Density (ASTM D698). PART 3 EXECUTION 3.1 EXCAVATION 1. General: Excavate to the lines and grades shown on the project grading plans. CONTRACTOR shall take precautions to minimize over-excavation. Over-excavation shall be filled with compacted infill material, or as directed by the ENGINEER/ARCHITECT, at the CONTRACTOR's expense. 2. Inspection: ARCHITECT/ENGINEER will inspect the excavation and approve prior to placement of leveling pad material. \\aaprojects\projects\28\28182\ _engineering\contract_documents\tech_specs\32_32_23_segmental_retaining_walls.doc Segmental Retaining Walls Page

76 Glen Lyn Pedestrian Riverfront Access Phase 2 (JN ) 05/29/ Excavation of deleterious soils and replacement with compacted infill material, as directed by the ARCHITECT/ENGINEER, will be paid for at the contract unit prices and shall be in accordance with Section Earthwork 4. Over-excavated areas in front of wall face shall be filled with compacted infill material at the CONTRACTOR's expense, or as directed by the ARCHITECT/ENGINEER. 5. Verify location of existing structures and utilities prior to excavation. Ensure all surrounding structures are protected from the effects of wall excavation. 3.2 LEVELING PAD CONSTRUCTION 1. General: Leveling pad shall be placed as shown on the construction plans with a minimum thickness of 6 inches. The leveling pad should extend laterally at least a distance of 6 inches from the toe and heel of the lower most SRW Unit. 2. Foundation Soil: shall be proofrolled and compacted to 95 percent Standard Proctor Density (ASTM D698) and inspected by the ARCHITECT/ENGINEER prior to placement of leveling pad materials. 3. Soil Leveling Pad Material: shall be compacted to provide a level hard surface on which to place the first course of units. Well-graded sand can be used to smooth the top 1/2 to 1/4 inch of the leveling pad. Compaction will be with mechanical plate compactors to 95 percent of maximum Standard Proctor Density (ASTM D698). 4. Leveling Pad: shall be prepared to ensure intimate contact of SRW units with pad. 3.3 SRW UNIT INSTALLATION 1. General: First course of SRW units shall be placed on the leveling pad. The units shall be leveled side-toside, front-to-rear and aligned with adjacent units. The first course is the most important to ensure accurate and acceptable results. Insure that units are in full contact with base. Place the front of the units side-by-side. Do not leave gaps between the front of adjacent units. Alignment may be done by means of a string line or offset from base line to the back of the units or along the pinning grooves. Lay out of curves and corners in accordance with SRW manufacturer's installation guidelines. 3. Placement and Compaction: Place and compact drainage fill between and behind units. Place and compact infill soil behind drainage fill. 5. Debris: Clean all excess debris from top of units and install next course. 6. Interlocking Pin or Clip Insert: Interlocking pin or clip devices shall be installed in accordance with the manufacturer s specifications. 7. Procedures: Repeat procedures to the extent of the wall height, ensuring that pins are engaged in each successive course. 8. SRW caps shall be glued to underlying units with manufacturer's recommended concrete adhesive. Caps shall (overhang, be flush with, or be setback from) the top course of units. END OF SECTION \\aaprojects\projects\28\28182\ _engineering\contract_documents\tech_specs\32_32_23_segmental_retaining_walls.doc Segmental Retaining Walls Page

77 Glen Lyn Pedestrian Riverfront Access Phase 2 (JN ) 07/31/2014 SECTION STEEL RAILING PART 1 GENERAL 1.1 DESCRIPTION 1. Work Included: Furnish and Install steel railing along proposed retaining wall in accordance with the plans and specifications. 2. Related Sections: Additional Sections of the Documents which are referenced in this Section include: 1.2 REFERENCES 1. General: The work shall comply with the most recent standards or tentative standards as published at the date of the contract and as listed in this specification using the abbreviation shown. 2. American Society for Testing and Materials (ASTM): 1) A653/A653M Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy Coated (Galvanized) by the Hot-Dip Process 2) B117 Practice for Operating Salt-Spray (Fog) Apparatus 3) D523 Test Method for Specular Gloss 4) D822 Practice for Conducting Tests on Paint and Related Coatings and Materials using Filtered Open-Flame Carbon-Arc Light and Water Exposure Apparatus 5) D1654 Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments 6) D2244 Test Method for Calculation of Color Differences from Instrumentally Measured Color Coordinates 7) D2794 Test Method for Resistance of Organic Coatings to The Effects of Rapid Deformation (Impact) 8) D3359 Test Method for Measuring Adhesion by Tape Test 1.3 QUALITY ASSURANCE 1. The contractor shall provide laborers and supervisors who are thoroughly familiar with the type of construction involved and materials and techniques specified. 1.4 SUBMITTALS 1. The manufacturer s literature shall be submitted prior to installation 1.5 DELIVERY, STORAGE AND HANDLING \\AAPROJECTS\Projects\28\28182\ _ENGINEERING\Contract_Documents\Tech_Specs\32_32_25_Steel_Railing.docx Steel Railing Page

78 Glen Lyn Pedestrian Riverfront Access Phase 2 (JN ) 07/31/ General: Upon receipt at the job site, all materials shall be checked to ensure that no damage occurred during shipping or handling. Materials shall be stored in such a manner to ensure proper ventilation and drainage, and to protect against damage, weather, vandalism and theft. PART 2 PRODUCTS 2.1 MATERIALS 1. General: The steel railing shall be a total system of welded ornamental steel design or approved equal. The system shall include all components (i.e., panels, posts, gates and hardware) required. The height to the top rail shall be 54 minimum. A post rail footer system shall utilize pre-manufactured handrail sleeve system when the railing is behind a proposed retaining wall is considered part or steel railing bid item. 2. Materials: All material shall be new and free from defects. Steel material for fence panels and posts shall conform to the requirements of ASTM A653/A653M, with a minimum yield strength of 50,000 psi (344 MPa) and a minimum zinc (hot-dip galvanized) coating weight of 0.90 oz/ft2 (276 g/m2), Coating Designation G-60. Material for fence pickets shall be 5/8 square x 18 Ga. tubing. The rails shall be steel channel and shall be capable of transversing various grades and grade changes with continuous railing and vertical posts. The rails shall be 1.25 x 0.75 x 14 Ga. Minimum. Picket holes in the rail shall be spaced o.c. Posts shall be a minimum of 2 square x 16 Ga. 2.1 FABRICATION 1. Pickets, rails and posts shall be pre-cut to specified lengths. Rails shall be pre-punched to accept pickets. Pickets shall be inserted into the pre-punched holes in the rails and shall be aligned to standard spacing using a specially calibrated alignment fixture. The aligned pickets and rails shall be joined at each picketto-rail intersection by a fusion welding process, thus completing the rigid panel assembly. 2. The manufactured panels and posts shall be subjected to an inline electrodeposition coating process consisting of a multi-stage pretreatment/wash (with zinc phosphate), followed by a duplex cathodic electrocoat application of an epoxy primer followed by an acrylic topcoat. The minimum cumulative coating thickness of epoxy and acrylic shall be 2 mils (0.058 mm). The color shall be Dark Gray. The coated panels and posts shall be capable of meeting the performance requirements for each quality characteristic as shown below: Adhesion - ASTM D3359 Method B - Adhesion (Retention of Coating) over 90% of test area (Tape and knife test). Corrosion Resistance ASTM B117 & D1654 Corrosion Resistance over 3,500 hours (Scribed per D1654; failure mode is accumulation of 1/8" coating loss from scribe or medium #8 blisters). Impact Resistance ASTM D2794 Impact Resistance over 60 inch lb. (Forward impact using 0.625" ball). Weathering Resistance ASTM D822, D2244, D523 (60 Method) - Weathering Resistance over 1,000 hours (Failure mode is 60% loss of gloss or color variance of more than 3 delta-e color units). PART 3 EXECUTION 3.1 INSTALLATION 1. General: All new installation shall be laid out by the contractor in accordance with the construction plans. 2. Fence posts shall be set with equal spacings of 96-3/4. o.c., plus or minus ½. The Posts shall be installed in concrete foundations per manufacturer s specifications. The work shall include posthole excavation, concrete, bracing, removal of excess material, restoration, remedial work, and cleaning the railing after final completion of the project. The top of the concrete foundation shall be set 2 below final shoulder grade and covered with shoulder material to grade. Care shall be taken to minimize disturbance to \\AAPROJECTS\Projects\28\28182\ _ENGINEERING\Contract_Documents\Tech_Specs\32_32_25_Steel_Railing.docx Steel Railing Page

79 Glen Lyn Pedestrian Riverfront Access Phase 2 (JN ) 07/31/2014 underlying retaining wall geogrid. Post holes shall be excavated by hand and geogrid neatly cut for post footing. Railing installation and footing construction shall be coordinated with the retaining wall construction. END OF SECTION \\AAPROJECTS\Projects\28\28182\ _ENGINEERING\Contract_Documents\Tech_Specs\32_32_25_Steel_Railing.docx Steel Railing Page