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Presto Geosystems Soil Stabilization System
 
         
SECTION 31 32 00
 
         
SOIL STABILIZATION SYSTEM
 
         
 
         
Copyright 2012 - 2022 ARCAT, Inc. - All rights reserved

          ** NOTE TO SPECIFIER ** Presto Geosystems; Geoweb Soil Stabilization System.
This section is based on the products of Presto Geosystems, which is located at:
670 N. Perkins St. P. O. Box 2399
Appleton, WI 54912-2399
Toll Free Tel: 800-548-3424
Tel: 920-736-1336
Fax: 920-738-1222
Email: request info
Web: http://www.prestogeo.com
[ Click Here ] for additional information.
PRESTO GEOSYSTEMS partners with architects and engineers to offer a full range of solutions for creating long-lasting porous pavements and solving challenging soil stabilization problems. The GEOBLOCK grass pavers and GEOPAVE® gravel pavers deliver durable, low-maintenance, permeable options to support any loading requirement and manage stormwater on-site. The GEOWEB® 3D soil stabilization system provides benefits in diverse environmental design applications including permeable pavements, slope erosion control, channel, and shoreline protection, vegetated MSE retaining walls and surface protection applications. The GEORUNNER® and GEOTERRA® systems are strong, yet light-weight construction mats ideal for site access and 40-70% more economical than timber or heavy HDPE mats. Presto offers free project evaluation service.
 
          PART 1GENERAL
 
          1.1SECTION INCLUDES
          ** NOTE TO SPECIFIER ** Delete any paragraphs below not applicable to project.
 
          A.Cellular Confinement System for open channels or single layer channel lining systems.
 
          B.Cellular Confinement System for slope protection.
 
          1.2RELATED SECTIONS
          ** NOTE TO SPECIFIER ** Delete sections below not relevant to this project; add others as required.
 
          A.Section 33 46 00 - Subdrainage.
 
          B.Section 02 20 00 - Assessment.
 
          C.Section 31 20 00 - Earth Moving.
 
          D.Section 31 25 00 - Erosion and Sedimentation Controls.
 
          E.Section 33 46 13.13 - Foundation Drainage Piping.
 
          F.Section 32 10 00 - Bases, Ballasts, and Paving.
 
          G.Section 32 39 33 - Artificial Rock Fabrications.
 
          H.Section - .
 
          I.Section 32 90 00 - Planting.
 
          J.Section 32 92 13 - Hydro-Mulching.
 
          1.3REFERENCES
          ** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
 
          A.American Association of State Highway and Transportation Officials (AASHTO):
          1.AASHTO M218 - Steel Sheet, Zinc-Coated (Galvanized) for Corrugated Steel Pipe.
          2.AASHTO M288 - Geotextile Specification for Highway Applications.
 
          B.American Society of Testing and Materials (ASTM):
          1.ASTM D1505 - Density of Plastics by the Density-Gradient Technique.
          2.ASTM D1603 - Standard Test for Carbon Black in Olefin Plastics.
          3.ASTM D1693 - Environmental Stress-Cracking of Ethylene Plastics.
          4.ASTM D5199 - Measuring Nominal Thickness of Geotextiles and Geomembranes.
          5.ASTM D5394 - Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics.
          6.ASTM D5596 - Standard Test Method for Microscopic Evaluation of the Dispersion of Carbon Black in Polyolefin Geosynthetics.
          7.ASTM D5721 - Standard Practice for Air-Oven Aging of Polyolefin Geomembranes.
          8.ASTM D5885 - Standard Test Method for Oxidative Induction Time of Polyolefin Geosynthetics by High-Pressure Differential Scanning Calorimetry.
          9.ASTM D6693 (Type IV) - Standard Test Method for Determining Tensile Properties of Nonreinforced Polyethylene and Nonreinforced Flexible Polypropylene Geomembranes.
          10.ASTM D7328 - Standard Test Method for Effect of Exposure of Unreinforced Polyolefin Geomembrane Using Fluorescent UV Condensation Apparatus.
          11.ASTM E41 - Terminology Relating to Conditioning.
 
          C.U.S. Army Corps of Engineers (USACE):
          1.Technical Report GL-86-19, Appendix A.
 
          D.International Organization for Standardization (European Union) (EN-ISO):
          1.EN ISO 13438 - Screening test method for determining the resistance of geotextiles and geotextile-related products to oxidation.
          2.EN 12224 - Geotextiles and geotextile-related products - Determination of the resistance to weathering.
          3.EN ISO 13426 - Geotextiles and geotextile-related products - Strength of internal structural junctions - Part 1: Geocells.
          4.EN ISO 10319 - Geosynthetics - Wide-width tensile test.
 
          1.4SUBMITTALS
 
          A.Submit under provisions of Section 01 30 00 - Administrative Requirements Administrative Requirements.
 
          B.Product Data: Submit manufacturer's product data including:
          1.Preparation instructions and recommendations.
          2.Storage and handling requirements and recommendations.
          3.Installation methods.
 
          C.Shop Drawings: Submit manufacturer's shop drawings including laying pattern and anchoring.
 
          D.Design Calculations and Drawings: Provide a complete set of design calculations including a description of the analysis performed to determine load support requirements.
          1.Calculations shall be submitted at the time of bid.
          2.The calculation method shall be based on computer software developed through research and testing at an accredited laboratory. Manufacturer shall provide compliance at time of bid.
          3.Minimum overall design factor of safety shall be 1.4.
          4.At a minimum; include design conditions, load support calculations, calculated factors of safety and friction angles.
          5.If required, provide a description of the recommended geotextile separation layer, and include in the calculations.
          6.If required, provide calculations for the recommended anchorage system.
          7.The calculations shall be in Microsoft Excel converted to Adobe PDF format.
          8.Cross section and plan view drawings shall be in AutoCAD converted to Adobe PDF format.
 
          E.Certificate of Analysis: Submit Manufacturer's certificate of analysis containing the following test results for the Geoweb geocell material used for project: Base Resin Lot Numbers, Resin Density per ASTM D1505, Production Lot Numbers, Material Thickness, Short Term Seam Peel Strength, and percentage of Carbon Black.
          ** NOTE TO SPECIFIER ** Delete installer and Manufacturer's field representative qualifications if not required.
 
          F.Submit qualifications certifying the installer is experienced in the installation of GEOWEB system,
 
          G.Submit qualifications of Manufacturer's field representative certifying field representative experience in the installation of GEOWEB system.
 
          H.No material will be considered as an equivalent to the geocell material specified herein unless it meets all requirements of this specification, without exception. Manufacturers seeking to supply equivalent material must submit records, data, independent test results, samples, certifications, and documentation deemed necessary by the Engineer to prove equivalency. The Engineer shall approve or disapprove other Manufacturers materials in accordance with the General Conditions after submission and review of provided information. All substitute materials submitted shall be subject to independent lab testing at the contractor's expense.
 
          1.5QUALITY ASSURANCE AND CONTROL
 
          A.The GEOWEB geocell material shall be provided from a single Manufacturer for the entire project.
 
          B.The Manufacturer's Quality management system shall be certified and in accordance with ISO 9001:2015 and CE certification. Substitute materials submitted shall provide a certification that the manufacturing process is part of an ISO program. Certification is required specifically stating that the testing facility is certified and in accordance with ISO. An ISO certification for the substitute material will not be acceptable unless it is proven it pertains specifically to the geocell manufacturing operations.
 
          C.The Manufacturer shall provide certification of compliance to all applicable testing procedures and related specifications upon the customer's written request. Request for certification shall be submitted no later than the date of order placement. The Manufacturer shall have a minimum of 20 years' experience producing GEOWEB geocell material.
 
          D.Pre-Installation Meeting: Prior to installation of any materials, conduct a pre-installation meeting to discuss the scope of work and review installation requirements. The pre-installation meeting shall be attended by all parties involved in the installation of the GEOWEB geocell system.
          1.Manufacturer shall provide a qualified field representative on site at the start of construction to ensure the GEOWEB geocell system is installed in accordance with the Contract Documents.
          2.Manufacturer's field representative shall have a minimum of 5 years' installation experience with the specified products in the specified application.
          3.Manufacturer of any substitute materials to be used shall certify that a representative can meet the above criteria and will be on site for initial construction start up. Manufacturers other than specified GEOWEB geocell system will be required to provide proof the representative meets these qualifications.
 
          1.6DELIVERY, STORAGE, AND HANDLING
 
          A.Deliver materials to site in manufacturer's original, unopened containers and packaging, with labels clearly identifying product name and manufacturer.
 
          B.Storage: Store materials in accordance with manufacturer's instructions. The materials shall be protected from damage and out of direct sunlight.
 
          C.Handling: Protect materials during handling and installation to prevent damage.
 
          1.7WARRANTY
 
          A.The Manufacturer shall warrant each GEOWEB geocell section that it ships to be free from defects in materials and workmanship at the time of manufacture. The Manufacturer's exclusive liability under this warranty or otherwise will be to furnish without charge to the original f.o.b. point a replacement for any section which proves to be defective under normal use and service during the 10 year period which begins on the date of shipment. The Manufacturer reserves the right to inspect any allegedly defective section to verify the defect and ascertain its cause.
 
          B.This warranty shall not cover defects attributable to causes or occurrences beyond the Manufacturer's control and unrelated to the manufacturing process, including, but not limited to, abuse, misuse, mishandling, neglect, improper storage, improper installation, improper alteration, or improper application.
 
          C.In no event shall the Manufacturer be liable for any special, indirect, incidental, or consequential damages for the breach of any express or implied warranty or for any other reason, including negligence, in connection with the GEOWEB geocell system.
 
          PART 2PRODUCTS
 
          2.1MANUFACTURERS
 
          A.Acceptable Manufacturer: Presto Geosystems, which is located at: 670 N. Perkins St. P. O. Box 2399; Appleton, WI 54912-2399; Toll Free Tel: 800-548-3424; Tel: 920-736-1336; Fax: 920-738-1222; Email: request info; Web: http://www.prestogeo.com
 
          B.Requests for substitutions will be considered in accordance with provisions of Section 01 60 00 - Product Requirements.
          ** NOTE TO SPECIFIER ** Delete paragraph above or below; coordinate with Division 1 requirements.
 
          C.Substitutions: Not permitted.
 
          2.2MATERIALS
          ** NOTE TO SPECIFIER ** Geoweb® Cellular Confinement System is used for open channels or single layer channel lining systems and slope protection systems.
 
          A.Geoweb: Geoweb Cellular Confinement System.
          1.Materials: Polyethylene Stabilized with Carbon Black.
          a.Density: 58.4 to 60.2 lbs per cu ft (0.935 to 0.965 grams per cu cm) in accordance with ASTM D1505 or ASTM D792.
          b.Environmental Stress Crack Resistance (ESCR): 5000 hours in accordance with ASTM D1693.
          c.Resistance to Oxidation shall be minimum of 50 years in accordance with EN ISO 13438.
          d.100 percent of original strip tensile strength shall be retained following exposure to accelerated weathering in in accordance with EN 12224.
          e.Ultra-Violet light stabilization with carbon black.
          f.Carbon Black Content: 1.5 to 2 percent by weight, through addition of a carrier with certified carbon black content, in accordance with ASTM D1603.
          g.Carbon black shall be homogeneously distributed throughout material, in accordance with ASTM D5596.
          h.Manufacturer shall have an in-place quality control to prevent irregularities in strip material.
          2.Cell Properties:
          a.Individual cells are uniform in shape and size when expanded.
          b.Individual cell dimensions (nominal) shall be plus or minus 10 percent of specified dimensions.
          ** NOTE TO SPECIFIER ** Select GW20V-Cell or GW30V-Cell and nominal depth and delete the others. Contact Presto Geosystems for assistance.
          c.GW20V-Cell:
          1)Length: 8.8 inches (224 mm).
          2)Width: 10.2 inches (259 mm).
          3)Nominal Area: 44.8 in2 (289 cm2) plus or minus 1 percent.
          4)Nominal Depth:
          a)8 inches (200 mm).
          b)6 inches (150 mm).
          c)4 inches (100 mm).
          d)3 inches (75 mm).
          d.GW30V-Cell:
          1)Length: 11.3 inches (287 mm).
          2)Width: 12.6 inches (320 mm).
          3)Nominal Area: 71.3 sq inches (460 sq cm) plus or minus 1 percent.
          4)Nominal Depth:
          a)8 inches (200 mm).
          b)6 inches (150 mm).
          c)4 inches (100 mm).
          d)3 inches (75 mm).
          3.Strip Properties and Assembly:
          a.Perforated Textured Strip/Cell:
          1)Strip sheet thickness (before surface disruption) 50 mil (1.27 mm), minus 5 percent, plus 10 percent in accordance with ASTM D5199. Determine thickness flat, before surface disruption.
          2)Polyethylene strips are surface textured with a multitude of rhomboidal (diamond shape) indentations.
          3)Textured sheet thickness 60 mil plus or minus 6 mil (1.52 mm plus or minus 0.15 mm).
          4)Indentation surface density 140 to 200 per sq inch (22 to 31 per sq cm).
          5)Strips perforated with horizontal rows of 0.4 inch (10 mm) diameter holes.
          6)Perforations within each row are 0.75 inches (19 mm) on-center.
          7)Horizontal rows are staggered and separated 0.50 inches (12 mm) relative to hole centers.
          8)Edge of strip to nearest edge of perforation are a minimum of 0.3 inches (8 mm).
          9)Centerline of spot weld to nearest edge of perforation is a minimum of 0.7 inches (18 mm).
          10)A slot of 3/8 by 1-3/8 inch (10 by 35 mm) in the center of the non-perforated areas and at the center of each weld.
          b.Assembly of Cell Sections:
          1)Fabricate using strips sheet polyethylene 142 inches (3.61 m) long and a width equal to cell depth.
          2)Connect strips using full depth ultrasonic spot-welds aligned perpendicular to longitudinal axis of strip.
          3)Ultrasonic weld melt-pool width shall be 1.0 inch (25 mm) maximum.
          ** NOTE TO SPECIFIER ** Specifier Note: Select GW20V Cell or GW30V Cell type and delete the
          4)Weld spacing for GW20V-cell sections shall be 14.0 inches plus or minus 0.10 inch (356 mm plus or minus 2.5 mm).
          5)Weld spacing for GW30V-cell sections shall be 17.5 inches plus or minus 0.10 inch (445 mm plus or minus 2.5 mm).
          4.Performance: Minimum seam strengths are required by design and shall be reported in test results submitted for approval. Materials submitted with average or typical values will not be accepted.
          a.Minimum seam strengths are required by design and shall be reported in test results. Materials submitted with average or typical values will not be accepted. Written certification of minimum strengths must be supplied to the engineer at the time of submittals.
          b.Short-Term Seam Peel-Strength Test:
          1)Cell seam strength shall be uniform over full depth of cell.
          ** NOTE TO SPECIFIER ** Select the minimum seam peel strength for the specified cell size and delete the others. Contact Presto Geosystems for assistance.
          2)Minimum seam peel strength:
          a)640 lbf (2,840 N) for 8 inch (200 mm) depth.
          b)480 lbf (2,130 N) for 6 inch (150 mm) depth.
          c)320 lbf (1,420 N) for 4 inch (100 mm) depth.
          d)240 lbf (1060 N) for 3 inch (75 mm) depth.
          c.Long-Term Seam Peel-Strength Test:
          1)Conditions: Minimum of 7 days in a temperature-controlled environment that undergoes change on a 1 hour cycle from room temperature to 130 degrees F (54 degrees C).
          2)Room temperature shall be in accordance with ASTM E41.
          3)Test samples shall consist of two, 4 inch (100 mm) wide strips welded together.
          4)Test sample consisting of 2 carbon black stabilized strips shall support a 160 pound (72.5 kg) load for test period.
          d.Internal Junction Efficiency:
          1)Junction efficiency determined as a ratio of junction performance to perforated strip performance, as determined by EN ISO 13426-1 and EN ISO 10319, respectively.
          2)Minimum internal junction efficiency shall be 100 percent or greater.
          e.Mechanical Junction Efficiency:
          1)Junction efficiency determined as a ratio of junction performance to perforated strip performance, as determined by EN ISO 13426-1 and EN ISO 10319, respectively.
          2)Minimum mechanical junction efficiency shall be 100 percent or greater.
          3)Connection type shall be with integral components as designated by the Manufacturer.
          f.10,000 hour Seam Peel Strength Certification: Provide data showing that high-density polyethylene resin used to produce Geoweb sections has been tested using an appropriate number of seam samples and varying loads to generate data indicating that seam peel strength survives a loading of at least 209 lbf (95 kg) for a minimum of 10,000 hours.
 
          B.Integral Components:
          1.ATRA Tendon Clips:
          a.The ATRA Tendon Clip is a molded, high-strength polyethylene device with a locking member and post with minimum pull-through of 420 lbs (191 kg).
          b.The ATRA Tendon Clip is the recommended anchorage connection method for securing sections with tendons for additional system hold-down.
          2.ATRA Stake Clip:
          a.The ATRA Stake Clip is a molded, high-strength polyethylene device available in standard (0.5 inch) and metric (10 to 12 mm) versions.
          b.ATRA Stake Clips are installed as an end cap on standard (0.5 inch) and metric (10 to 12 mm) steel reinforcing rods to form ATRA Anchors.
          3.ATRA Key:
          a.ATRA Keys shall be constructed of polyethylene and provide a high strength connection with minimum pull-through of 275 lbs (125 kg).
          b.ATRA Keys shall be used to connect GEOWEB panels together at each interleaf and end-to end connection.
          c.Metal staples and zip ties are not an acceptable panel connection method.
          ** NOTE TO SPECIFIER ** Select the desired stake anchorage and delete the others. ATRA® Anchors, ATRA® Speed Stakes, or ATRA® GFRP Anchors may be used for temporary or permanent anchoring. Anchors may be required for securing Geoweb® sections in-place based on site conditions, especially for saturated soils or sloped applications. Contact Presto Geosystems for an evaluation including calculations, drawings, and specifications.
          d.ATRA Speed Stakes and ATRA® GFRP Anchors are suitable for environments that may degrade steel rebar. The ATRA® GFRP Anchor and ATRA® Speed Stakes are impervious to pH degradation. No permanent stake anchorage may be necessary. Contact Presto Geosystems for assistance.
 
          C.Stake Anchorage:
          1.ATRA Anchors:
          a.ATRA Anchors consist of standard (0.5 inch) or metric (10 to 12 mm) steel reinforcing rod with an ATRA Stake Clip attached as an end cap.
          b.ATRA anchors shall be assembled by inserting the ATRA Clip onto the reinforcing rod so that the end is flush with the top of the ATRA Stake Clip. Prior to attaching the ATRA Stake Clip, the reinforcing rod shall be beveled and free from all burrs.
          c.Stake length and staking pattern shall be as indicated in the Contract Documents.
          2.ATRA Speed Stakes:
          a.ATRA Speed Stake shall be one piece injected molded design with integral flanged arms and barbs.
          b.Stake shall be constructed of a specialty based HDPE polymer alloy.
          c.Minimum tensile strength shall be 14.5 kips (100 mPa).
          d.Minimum bending strength shall be 575 lbs (2.55 kN).
          e.Stake shall be non-magnetic, non-conducting and corrosion resistant.
          f.Stake length and placement shall be as shown in the Contract Documents.
          3.ATRA Glass Fiber Reinforced Polymer (GFRP) Anchors:
          a.ATRA GFRP Anchors shall be pre-assembled units consisting of the ATRA Stake Clip inserted onto a GFRP stake.
          b.Glass reinforcement content shall be 75 percent minimum by weight and shall be continuous longitudinal filament.
          c.Polymer shall be vinyl ester, isophthalic polyester or other matrix material.
          d.Outer surface shall be sand coated and deformed by a helical glass wrap.
          e.Minimum compressive strength shall be 95 kips (655 MPa) in accordance with ASTM D638.
          f.Anchor shall be non-magnetic, non-conducting and corrosion resistant.
          g.Anchor length and placement shall be as shown in the Contract Documents.
          ** NOTE TO SPECIFIER ** If required, select the desired tendon material and corresponding break-strength, and delete the others. Tendons may be required for additional system hold-down, especially when no anchors are used, such as when the system is over a geomembrane. Kevlar or polypropylene tendons are recommended for concrete infill. Contact Presto Geosystems for assistance.
 
          D.Tendon Anchorage:
          1.Tendon Material: Woven Polypropylene, TPP-55. 3-strand twisted rope.
          a.Minimum break strength shall be 1250 lbf (5.56 kN)
          2.Tendon Material: Woven Polyester - TP-67.
          a.Bright high-tenacity, industrial-continuous-filament, polyester yarn woven into a braided strap.
          b.Elongation shall be 9 to 15 percent at break.
          c.Minimum break strength shall be 1506 lbf (6.70 kN) for TP-67.
          3.Tendon Material:" Woven Polyester - TP-93.
          a.Bright high-tenacity, industrial-continuous-filament, polyester yarn woven into a braided strap.
          b.Elongation shall be 9 to 15 percent at break.
          c.Minimum break strength shall be 2090 lbf (9.30 kN) for TP-93.
          4.Tendon Material: Woven Polyester - TP-225.
          a.Bright high-tenacity, industrial-continuous-filament, polyester yarn woven into a braided strap.
          b.Elongation shall be 9 to 15 percent at break.
          c.Minimum break strength shall be 5100 lbf (22.5 kN).
          5.Tendon Material: Woven Kevlar TK-178.
          a.Kevlar Aramid material woven into a strap.
          b.Minimum break strength shall be 4000 lbf (17.8 kN).
          6.Type of Tendon Anchorage:
          ** NOTE TO SPECIFIER ** Select the anchorage system being used with tendons and delete those not required. Coordinate infill materials with Section 31 20 00 - Earth Moving and Section 32 10 00 - Bases, Ballasts, and Paving as required. Engineered infill is typically used to provide structural strength in areas exposed to vehicle loads. Contact Presto Geosystems for assistance.
          a.Tendons, ATRA Tendon Clips and ATRA Anchors.
          b.Tendons, ATRA Tendon Clips and ATRA Speed Stakes.
          c.Tendons, ATRA Tendon Clips and ATRA GFRP Anchors.
          d.Tendons, ATRA Tendon Clips and Pipe Deadman Anchorage.
          e.Tendons, ATRA Tendon Clips and Earth Anchors.
 
          2.3INFILL MATERIALS
 
          2.4Specifier Note: Specify infill material type and delete the others. Coordinate infill materials with associated Soils and Concrete specifications. Engineered infill is typically used to provide structural strength in areas exposed to vehicle loads. Contact Presto Geosystems for assistance.
 
          2.5Infill materials for load support applications should be predominately granular with fines content less than 10%. Soils with greater than 10% fines have low permeability and lose strength when wet. A small fraction of fines (less than 10%) increases stability by binding the soil and reducing the void space. Concrete infill is typically used for low water crossings and boat ramps. Engineered infill is typically used to provide the necessary structural strength for load support in areas where vegetation is desired.
 
          A.Infill material shall be course, drainable sand.
 
          B.Infill material shall be crushed aggregate with a maximum particle size of 1/3 of the cell wall height. If drainage is desired, limit the fines content to less than 10 percent.
 
          C.Infill material shall be concrete with a minimum strength of 3000 psi (20684 kPa) and air content of 2 to 4 percent in accordance with ACI and ASTM standards.
 
          D.Engineered infill shall consist of a topsoil and aggregate mixture for vegetated surfaces.
          1.Engineered infill shall be a mix of topsoil and aggregate having a homogeneous mixture of a clear crushed aggregate having an AASHTO No. 5 or similar designation blended with pulverized topsoil and a minimum 30 percent void space for air and/or water.
          2.The mixture shall promote vegetation growth and provide structural support.
          3.The aggregate portion shall have a particle range from 0.375 to 1.0 inches (9.5 to 25 mm) with a D50 of 0.5 inches (13 mm) and shall equal 67 percent of the total volume.
          4.The percentage void space of the aggregate portion when compacted shall be at least 30 percent.
          5.The pulverized topsoil portion shall equal 33 percent of the total volume. The topsoil shall be blended with the aggregate to produce a homogeneous mixture.
          6.Once placed, the engineered fill shall be compacted to a 95 percent Standard Proctor.
 
          E.Infill material shall be free of any foreign material.
 
          F.Clays, silts, and organics are not acceptable infill material.
 
          G.Infill material shall be free-flowing and not frozen when placed in the GEOWEB panels.
 
          2.6ADDITIONAL COMPONENTS
          ** NOTE TO SPECIFIER ** If required, select the desired additional components, and delete the others. A geotextile separation layer is typically recommended for separation between the native soil and infill material. Separation is important to prevent contamination and loss of shear strength of the infill material and to prevent punching or migration of the infill material into the subgrade. The geotextile may also be part of the design to provide additional support. Slit tape woven geotextiles are not recommended for load support applications due to lack of drainage capabilities. High performance woven geotextiles shall be used. Non-woven geotextiles can be used but the designer shall ensure the sub grade does not have high silt content or low plasticity that can lead to clogging.
 
          2.7Additional subbase materials may be required under the GEOWEB layer to support loading or for additional stormwater storage requirements.
 
          2.8A minimum surface wearing course of 2 inches (50 mm) is typically recommended to prevent trafficking directly on top of the GEOWEB cell walls. If an asphalt or concrete surface is desired over the GEOWEB®, a minimum one inch (25 mm) separation layer of infill material shall be provided over the GEOWEB® to provide minor consolidation of the surface cover and to prevent contact of the asphalt or concrete with the GEOWEB® cell walls. Contact Presto Geosystems for assistance.
 
          A.Vegetation: Vegetation shall be as specified in the Contract Documents.
 
          B.Surface Protection:
          ** NOTE TO SPECIFIER ** Delete surface protection option not required.
          1.Erosion control blanket as specified in the Contract Documents.
          2.Turf reinforcement mat as specified in the Contract Documents.
 
          C.Geotextile: The geotextile separation layer shall be as specified in the Contract Documents.
 
          PART 3EXECUTION
 
          3.1EXAMINATION
 
          A.Verify site conditions are as indicated on the drawings. Notify the Engineer if site conditions are not acceptable. Do not begin preparation or installation until unacceptable conditions have been corrected.
 
          B.Verify layout of structure is as indicated on the drawings. Notify the Engineer if layout of structure is not acceptable. Do not begin preparation or installation until unacceptable conditions have been corrected.
 
          3.2PREPARATION
 
          A.Prepare subgrade and install load support system in accordance with Manufacturer's instructions.
 
          B.On-site time for installation assistance by the Manufacturer's field representative shall be ____ days with one trip. All travel and expense costs for Manufacturer's field representative installation assistance shall be included in the base bid price.
 
          C.Subgrade Preparation:
          1.Excavate and shape foundation soils as indicated on the drawings.
          2.Ensure foundation soil meets minimum strength requirements through proof rolling or other conventional method, as approved by the Engineer. If unacceptable foundation soils are encountered, excavate, and replace with suitable quality material as directed by the Engineer.
          ** NOTE TO SPECIFIER ** Delete this section if a geotextile separation layer is not required.
          3.Install geotextile separation layer on prepared surfaces ensuring required overlaps are maintained and outer edges of the geotextile are buried in accordance with the Manufacturer's recommendations.
          ** NOTE TO SPECIFIER ** Delete this section if additional subbase materials are not required.
 
          D.Subbase Preparation and Installation:
          1.Ensure that the subgrade soil meets the minimum strength requirements for installation of the subbase.
          2.Place additional subbase materials to the required depth as specified in the Contract Documents.
          3.Compact to a minimum 95 percent Standard Proctor.
          ** NOTE TO SPECIFIER ** Delete this section if additional subbase materials in section above is not required.
          4.Install geotextile separation layer on top of subbase ensuring required overlaps are maintained and outer edges of the geotextile are buried in accordance with the Manufacturer's recommendations and sub grade CBR.
 
          3.3INSTALLATION
 
          A.GEOWEB Section Placement and Connection:
          1.Place GEOWEB sections and verify all sections are expanded uniformly to required dimensions and that outer cells of each section are correctly aligned. Interleaf or overlap edges of adjacent sections. Ensure upper surfaces of adjoining GEOWEB sections are flush at joint and adjoining cells are fully aligned at the cell wall slot.
          2.Connect the GEOWEB sections with ATRA Keys at each interleaf and end-to-end connection. Insert the ATRA Key through the cell wall slot before inserting through the adjacent cell. Turn the ATRA Key 90 degrees to lock the panels together.
          ** NOTE TO SPECIFIER ** Specify anchorage type from Sections F-N below and delete those not required. Choice should coordinate with appropriate paragraphs in PART 2.
          3.Anchorage with ATRA Anchors:
          a.Position collapsed Geoweb sections at the crest of the slope.
          b.If required, excavate an anchor trench at the top of the slope to the depth as indicated on the Contract Documents.
          c.Drive ATRA anchors at the crest of the slope to secure the sections in place and allow expansion of the Geoweb sections into position.
          d.After the sections are expanded as desired, drive ATRA Anchors so the arm of the ATRA Stake Clip engages with the top of the cell wall.
          e.Anchorage pattern and stake length shall be as indicated on the Contract Documents.
          f.Fill the anchorage trench with the specified material and compact as required in Contract Documents.
          4.Anchorage with ATRA Speed Stakes:
          a.Position collapsed sections into place and partially drive ATRA Speed Stakes in the outer edge cells and expand sections into place. Partially drive ATRA Speed Stakes in the perimeter cells to keep sections fully expanded.
          b.With sections fully expanded, drive ATRA Speed Stakes so the arm of the ATRA Speed Stake so the arm engages with the top of the cell wall.
          c.Anchorage pattern and stake length shall be as indicated in the Contract Documents.
          5.Anchorage with ATRA GFRP Anchors:
          a.Position collapsed sections into place and partially drive ATRA GFRP Anchors in the outer edge cells and expand sections into place. Partially drive ATRA GFRP Anchors in the perimeter cells to keep sections fully expanded.
          b.With sections fully expanded, drive ATRA GFRP Anchors so the arm of the ATRA GFRP Anchor is through the internal slots in the cell wall and anchors do not protrude over the top of the cell wall.
          c.Anchorage pattern and stake length shall be as indicated on the Contract Documents.
          6.Anchorage with Tendons, ATRA Tendon Clips and Buried at Crest: Preferred Method - Top of Slope Installation.
          a.Excavate the anchor trench at the top of the slope to the depth as shown in the Contract Documents.
          b.Position the collapsed sections at the crest of the slope.
          c.Measure and cut the tendon run lengths for each tendon location.
          d.Mark the tendons with a black permanent marker per the ATRA Tendon Clip Location Chart.
          e.Starting from the first cell, count the number of cells to the next ATRA Tendon Clip location and repeat along that cell row.
          f.Repeat this procedure for each additional cell row Tendon/ATRA Tendon Clip run.
          g.With all the ATRA Tendon Clips placed in the section, thread the tendons through the cell wall I-slots in the unexpanded section.
          h.Locate the corresponding mark on the tendon and position it in front of the cell wall. Hold the tendon and connect to the ATRA Tendon Clip. Refer to the Slope Installation Manual for ATRA Tendon Clip tie-off instructions.
          i.Leave the trailing length of the tendon on the upslope side of the section to allow connection to ATRA Tendon Clip.
          j.Repeat this process on each cell row Tendon/ATRA Tendon Clip run.
          k.Place the collapsed section in the anchor trench, secure with temporary stakes or ATRA Anchors and expand down the slope. Number of anchors shall be in accordance with the Contract Documents.
          l.Adjust the section (i.e. a shake or two of the expanded section works well for this) so that the section and tendons are uniformly taut.
          m.Terminate the bottom of the tendons with ATRA Tendon Clips.
          n.Fill the anchorage trench with the specified material and compact as indicated in the Contract Documents.
          7.Anchorage with Tendons, ATRA Tendon Clips and Buried at Crest: Alternate Method - On Slope Installation.
          a.Excavate the anchor trench at the top of the slope to the depth indicated in the Contract Documents.
          b.Position collapsed sections at the crest of the slope.
          c.Feed precut lengths of specified tendon material through the I-slots in cell walls before expanding individual sections into position. Number of tendons per section shall be as required. Leave the trailing length of the tendon on the upslope side of the section to allow for connection of the ATRA Tendon Clips.
          d.Place the collapsed section in the anchor trench, secure with temporary stakes or ATRA Anchors and expand down the slope.
          e.Install the ATRA Tendon Clips at the locations as indicated in the Contract Documents.
          f.Hold the tendon and connect to each ATRA Tendon Clip. Refer to the Slope Installation Manual for ATRA Tendon Clip tie-off instructions.
          g.Adjust the section (i.e. a shake or two of the expanded section works well for this) so that the section and tendons are uniformly taut.
          h.Terminate the bottom of the tendons with ATRA Tendon Clips.
          i.Fill the anchorage trench with the specified material and compact as indicated in the Contract Documents.
          8.Anchorage with Tendons, ATRA Tendon Clips and ATRA Anchors Preferred Method, Top of Slope Installation.
          a.Excavate the anchor trench at the top of the slope to the depth as shown on the Contract Documents.
          b.Position the collapsed sections at the crest of the slope.
          c.Measure and cut the tendon run lengths for each tendon location.
          d.Mark the tendons with a black permanent marker per the ATRA Tendon Clip Location Chart.
          e.Thread the tendons through the unexpanded section.
          f.Starting from the first cell, count the number of cells to the next ATRA Tendon Clip location and repeat along that cell row.
          g.Repeat this procedure for each additional cell row tendon/ATRA Tendon Clip run.
          h.With all the ATRA Tendon Clips placed in the section, thread the tendons through the cell wall slots in the unexpanded section.
          i.Locate the corresponding mark on the Tendon and position it in front of the cell wall. Hold the tendon and connect to the ATRA Tendon Clip. Refer to the Slope Installation Manual for ATRA Tendon Clip tie-off instructions.
          j.Repeat this process on each cell row tendon/ATRA Tendon Clip run.
          k.Place the collapsed section in the anchor trench, drive ATRA Anchors in the first row of cells so the arm of the anchor engages with the top of the cell wall and expand down the slope. Number of anchors shall be per the Contract Documents.
          l.Adjust the section (i.e. a shake or two of the expanded section works well for this) so that the section and tendons are uniformly taut.
          m.After the sections are expanded, drive ATRA Anchors so the arm of the anchor engages with the top of the cell wall.
          n.Anchorage pattern and stake length shall be as indicated on the Contract Documents.
          o.Terminate the bottom of the tendons with ATRA Tendon Clips.
          p.Fill the anchorage trench with the specified material and compact as required by the Contract Documents.
          9.Anchorage with Tendons, ATRA Tendon Clips and ATRA Anchors Alternate Method , On Slope Installation.
          a.Excavate the anchor trench at the top of the slope to the depth as shown on the Contract Documents.
          b.Position collapsed sections at the crest of the slope.
          c.Feed precut lengths of specified tendon material through the I-slots in the cell walls before expanding individual sections into position. Number of tendons per section shall be per the Contract Documents. Leave the trailing length of the tendon on the upslope side of the section to allow for connection of the ATRA Tendon Clips.
          d.Place the collapsed section in the anchor trench, drive ATRA Anchors in the first row of cells so the arm of the anchor engages with the top of the cell wall and expand down the slope.
          e.Install the ATRA Tendon Clips at the locations indicated on the Contract Documents.
          f.Hold the tendon and connect to each ATRA Tendon Clip. Refer to the Slope Installation Manual for ATRA Tendon Clip tie-off instructions.
          g.Adjust the section (i.e. a shake or two of the expanded section works well for this) so that the section and tendons are uniformly taut.
          h.After the sections are expanded as desired, drive ATRA Anchors so the arm of the anchor engages with the top of the cell wall.
          i.Anchorage pattern and stake length shall be as indicated on the Contract Documents.
          j.Terminate the bottom of the tendons as required.
          k.Fill the anchorage trench with the specified material and compact as required by the Contract Documents.
          10.Anchorage with Tendons, ATRA Tendon Clips and ATRA Speed Stakes: Preferred Method - Top of Slope Installation.
          a.Excavate the anchor trench at the top of the slope to the depth as shown on the Contract Documents.
          b.Position the collapsed sections at the crest of the slope.
          c.Measure and cut the tendon run lengths for each tendon location.
          d.Mark the tendons with a black permanent marker per the ATRA Tendon Clip Location Chart.
          e.Thread the tendons through the unexpanded section.
          f.Starting from the first cell, count the number of cells to the next ATRA Tendon Clip location and repeat along that cell row.
          g.Repeat this procedure for each additional cell row tendon/ATRA Tendon Clip run.
          h.With all the ATRA Tendon Clips placed in the section, thread the tendons through the cell wall I-slots in the unexpanded section.
          i.Locate the corresponding mark on the Tendon and position it in front of the cell wall. Hold the tendon and connect to the ATRA Tendon Clip. Refer to the Slope Installation Manual for ATRA Tendon Clip tie-off instructions.
          j.Repeat this process on each cell row tendon/ATRA Tendon Clip run.
          k.Place the collapsed section in the anchor trench, drive ATRA Anchors in the first row of cells so the arm of the anchor engages with the top of the cell wall and expand down the slope. Number of anchors shall be in accordance with the Contract Documents.
          l.Adjust the section (i.e. a shake or two of the expanded section works well for this) so that the section and tendons are uniformly taut.
          m.After the sections are expanded, drive ATRA Speed Stake so the arm of the stake engages with the top of the cell wall.
          n.Anchorage pattern and stake length shall be as indicated on the Contract Documents.
          o.Terminate the bottom of the tendons with ATRA Tendon Clips.
          p.Fill the anchorage trench with the specified material and compact as required by the Contract Documents.
          11.Anchorage with Tendons, ATRA Tendon Clips and ATRA Speed Stakes: Alternate Method, On Slope Installation.
          a.Excavate the anchor trench at the top of the slope to the depth as shown on the Contract Documents.
          b.Position collapsed sections at the crest of the slope.
          c.Feed precut lengths of specified tendon material through the I-slots in the cell walls before expanding individual sections into position. Number of tendons per section shall be per the Contract Documents. Leave the trailing length of the tendon on the upslope side of the section to allow for connection of the ATRA Tendon Clips.
          d.Place the collapsed section in the anchor trench, drive ATRA Anchors in the first row of cells so the arm of the anchor engages with the top of the cell wall and expand down the slope.
          e.Install the ATRA Tendon Clips at the locations indicated in the Contract Documents.
          f.Hold the tendon and connect to each ATRA Tendon Clip. Refer to the Slope Installation Manual for ATRA Tendon Clip tie-off instructions.
          g.Adjust the section (i.e. a shake or two of the expanded section works well for this) so that the section and tendons are uniformly taut.
          h.After the sections are expanded as desired, drive ATRA Speed Stake so the arm of the stake engages with the top of the cell wall.
          i.Anchorage pattern and stake length shall be as indicated in the Contract Documents.
          j.Terminate the bottom of the tendons as required.
          k.Fill the anchorage trench with the specified material and compact as required by the Contract Documents.
          12.Anchorage with Tendons, ATRA Tendon Clips and ATRA GFRP Anchors: Preferred Method, Top of Slope Installation.
          a.Excavate the anchor trench at the top of the slope to the depth as shown in the Contract Documents.
          b.Position the collapsed sections at the crest of the slope.
          c.Measure and cut the tendon run lengths for each tendon location.
          d.Mark the tendons with a black permanent marker per the ATRA Tendon Clip Location Chart.
          e.Thread the tendons through the unexpanded section.
          f.Starting from the first cell, count the number of cells to the next ATRA Tendon Clip location and repeat along that cell row.
          g.Repeat this procedure for each additional cell row Tendon/ATRA Tendon Clip run.
          h.With all the ATRA Tendon Clips placed in the section, thread the tendons through the cell wall I-slots in the unexpanded section.
          i.Locate the corresponding mark on the Tendon and position it in front of the cell wall. Hold the tendon and connect to the ATRA Tendon Clip. Refer to the Slope Installation Manual for ATRA Tendon Clip tie-off instructions.
          j.Repeat this process on each cell row Tendon/ATRA Tendon Clip run.
          k.Place the collapsed section in the anchor trench, drive ATRA GFRP anchors in the first row of cells so the arm of the anchor engages with the top of the cell wall and expand down the slope. Number of anchors shall be as shown in the Contract Documents.
          l.Adjust the section (i.e. a shake or two of the expanded section works well for this) so that the section and tendons are uniformly taut.
          m.After the sections are expanded, drive ATRA GFRP Anchors so the arm of the anchor engages with the top of the cell wall.
          n.Anchorage pattern and stake length shall be as shown in the Contract Documents.
          o.Terminate the bottom of the tendons with ATRA Tendon Clips.
          p.Fill the anchorage trench with the specified material and compact as shown in the Contract Documents.
          13.Anchorage with Tendons, ATRA Tendon Clips and ATRA GFRP Anchors: Alternate Method - On Slope Installation.
          a.Excavate the anchor trench at the top of the slope to the depth a as shown in the Contract Documents.
          b.Position collapsed sections at the crest of the slope.
          c.Feed precut lengths of specified tendon material through the I-slots in the cell walls before expanding individual sections into position. Number of tendons per section shall be a in accordance with the Contract Documents. Leave the trailing length of the tendon on the upslope side of the section to allow for connection of the ATRA Tendon Clips.
          d.Place the collapsed section in the anchor trench, drive ATRA GFRP Anchors in the first row of cells so the arm of the anchor engages with the top of the cell wall and expand down the slope. Number of anchors shall be in accordance with the Contract Documents.
          e.Install the ATRA Tendon Clips at the locations as shown in the Contract Documents.
          f.Hold the tendon and connect to each ATRA Tendon Clip. Refer to the Slope Installation Manual for ATRA Tendon Clip tie-off instructions.
          g.Adjust the section (i.e. a shake or two of the expanded section works well for this) so that the section and tendons are uniformly taut.
          h.After the sections are expanded as desired, drive ATRA GFRP Anchors so the arm of the anchor engages with the top of the cell wall.
          i.Anchorage pattern and stake length shall be as shown in the Contract Documents.
          j.Terminate the bottom of the tendons with ATRA Tendon Clips.
          k.Fill the anchorage trench with the specified material and compact as shown in the Contract Documents.
          14.Anchorage with Tendons, ATRA Tendon Clips and Pipe Deadman Anchorage: Preferred Method - Top of Slope Installation
          a.Excavate the anchor trench at the top of the slope to the depth as shown in the Contract Documents.
          b.Install pipe Deadman in anchor trench. Pipe type, diameter and thickness as shown in the Contract Documents.
          c.Position the collapsed sections at the crest of the slope.
          d.Measure and cut the tendon run lengths for each tendon location allowing extra length to connect to deadman anchor.
          e.Mark the tendons with a black permanent marker per the ATRA Tendon Clip Location Chart.
          f.Thread the tendons through the unexpanded section.
          g.Starting from the first cell, count the number of cells to the next ATRA Tendon Clip location and repeat along that cell row.
          h.Repeat this procedure for each additional cell row Tendon/ATRA Tendon Clip run.
          i.With all the ATRA Tendon Clips placed in the section, thread the tendons through the cell wall I-slots in the unexpanded section.
          j.Locate the corresponding mark on the Tendon and position it in front of the cell wall. Hold the tendon and connect to the ATRA Tendon Clip. Refer to the Slope Installation Manual for ATRA Tendon Clip tie-off instructions.
          k.Repeat this process on each cell row Tendon/ATRA Tendon Clip run.
          l.Place the collapsed section in the anchor trench, connect tendons to the deadman anchor and expand down the slope.
          m.Adjust the section (i.e. a shake or two of the expanded section works well for this) so that the section and tendons are uniformly taut.
          n.Terminate the bottom of the tendons with ATRA Tendon Clips.
          o.Fill the anchorage trench with the specified material and compact as shown in the Contract Documents.
          15.Anchorage with Tendons, ATRA Tendon Clips and Pipe Deadman Anchorage: Alternate Method - On Slope Installation.
          a.Excavate the anchor trench at the top of the slope to the depth as shown in the Contract Documents.
          b.Position collapsed sections at the crest of the slope.
          c.Feed precut lengths of specified tendon material through the I-slots in cell walls before expanding individual sections into position. Number of tendons per section shall be as required. Leave the trailing length of the tendon on the upslope side of the section to allow for connection to deadman anchor.
          d.Place the collapsed section in the anchor trench, secure tendons to earth anchors, and expand down the slope.
          e.Install the ATRA Tendon Clips at the locations indicated in the Contract Documents.
          f.Hold the tendon and attach to the ATRA Tendon Clips. Refer to the Slope Installation Manual for ATRA Tendon Clip tie-off instructions.
          g.Adjust the section (i.e. a shake or two of the expanded section works well for this) so that the section and tendons are uniformly taut.
          h.Terminate the bottom of the tendons with ATRA Tendon Clips.
          i.Fill the anchorage trench with the specified material and compact as required by the Contract Documents.
          16.Anchorage with Tendons, ATRA Tendon Clips and Earth Anchors Preferred Method, Top of Slope Installation.
          a.Excavate the anchor trench at the top of the slope to the depth as shown on the Contract Documents.
          b.Position the collapsed sections at the crest of the slope.
          c.Measure and cut the tendon run lengths for each tendon location allowing extra length to connect to earth anchor.
          d.Mark the tendons with a black permanent marker per the ATRA Tendon Clip Location Chart.
          e.Thread the tendons through the unexpanded section.
          f.Starting from the first cell, count the number of cells to the next ATRA Tendon Clip location and repeat along that cell row.
          g.Repeat this procedure for each additional cell row tendon/ATRA Tendon Clip run.
          h.With all the ATRA Tendon Clips placed in the section, thread the tendons through the I-slots in the unexpanded section.
          i.Locate the corresponding mark on the Tendon and position it in front of the cell wall. Hold the tendon and connect to the ATRA Tendon Clip. Refer to the Slope Installation Manual for ATRA Tendon Clip tie-off instructions.
          j.Repeat this process on each cell row tendon/ATRA Tendon Clip run.
          k.Install earth anchors in accordance with Manufacturer's recommendations and instructions. Earth anchor type and strength shall be as shown on the Contract Documents.
          l.Place the collapsed section in the anchor trench, secure tendons to earth anchors and expand down the slope.
          m.Adjust the section (i.e. a shake or two of the expanded section works well for this) so that the section and tendons are uniformly taut.
          n.Terminate the bottom of the tendons with ATRA Tendon Clips.
          o.Fill the anchorage trench with the specified material and compact as required by the Contract Documents.
          17.Anchorage with Tendons, ATRA Tendon Clips and Earth Anchors Alternate Method, On Slope Installation.
          a.Excavate the anchor trench at the top of the slope to the depth as shown on the Contract Documents.
          b.Position collapsed sections at the crest of the slope.
          c.Feed precut lengths of specified tendon material through the I-slots in the cell walls before expanding individual sections into position. Number of tendons per section shall be per the Contract Documents. Leave the trailing length of the tendon on the upslope side of the section to allow for connection of the ATRA Tendon Clips.
          d.Install earth anchors in accordance with Manufacturer's recommendations and instructions. Earth anchor type and strength shall be as shown on the Contract Documents.
          e.Place the collapsed section in the anchor trench, secure tendons to earth anchors, and expand down the slope.
          f.Install the ATRA Tendon Clips at the locations indicated on the Contract Documents.
          g.Hold the tendon and attach to the ATRA Tendon Clips. Refer to the Slope Installation Manual for ATRA Tendon Clip tie-off instructions.
          h.Adjust the section (i.e. a shake or two of the expanded section works well for this) so that the section and tendons are uniformly taut.
          i.Terminate the bottom of the tendons with ATRA Tendon Clips.
          j.Fill the anchorage trench with the specified material and compact as required by the Contract Documents.
          k.Specifier Note: Delete infill type not required. Choice should coordinate with Appropriate articles in PART 2.
 
          B.Sand Infill Placement:
          1.Place the specified aggregate infill with suitable material handling equipment.
          2.Infill material shall be free-flowing and not frozen when placed in the GEOWEB sections.
          3.Overfill cells with aggregate infill material. Limit the drop height of infill material to avoid damage or displacement of the cell wall.
          4.Level surface approximately 2 inches (50 mm) above cell walls. Maintain a 2 inch (50 mm) wear surface over the GEOWEB sections to prevent damage to the cell walls.
          5.Compact infill to a minimum of 95 percent Standard Proctor.
          6.Shape compacted surface to required elevation as indicated on the drawings.
 
          C.Crushed Aggregate Infill Placement:
          1.Place the specified aggregate infill with suitable material handling equipment.
          2.Infill material shall be free-flowing and not frozen when placed in the GEOWEB sections.
          3.Overfill cells with aggregate infill material. Limit the drop height of infill material to avoid damage or displacement of the cell wall.
          4.Level surface approximately 2 inches (50 mm) above cell walls. Maintain a 2 inch (50 mm) wear surface over the GEOWEB sections to prevent damage to the cell walls.
          5.Compact infill to a minimum of 95 percent Standard Proctor.
          6.Shape compacted surface to required elevation as indicated on the drawings.
 
          D.Concrete Infill Placement:
          1.Concrete shall be placed, finished, and cured as specified in Section 03 30 00 - Cast-in-Place Concrete.
          2.Once placing operation commences, it shall be carried out as a continuous operation until a designated section is completed or as approved by the Engineer.
          3.Limit drop height to prevent panel distortion. Fill Geoweb sections from the crest of the slope to toe or in accordance with Engineer's direction.
          4.Where concrete chutes are used, the end of the chute shall be baffled to prevent segregation of the concrete.
          5.Adjust the slump in the field to allow installation.
          6.Concrete shall be thoroughly compacted by means of an approved vibrator. Period of vibration shall not be less than 2 seconds nor more than 5 seconds at any one point.
          7.Concrete shall be flush with the top of the Geoweb walls.
          8.Apply specified finish.
 
          E.Engineered Infill Placement:
          1.Place the specified engineered infill with suitable material handling equipment.
          2.Infill Material: Free-flowing and not frozen when placed in the GEOWEB sections.
          3.Overfill cells with engineered infill material. Limit the drop height of infill material to avoid damage or displacement of the cell wall.
          4.Level surface approximately 2 inches (50 mm) above cell walls. Maintain a 2 inch (50 mm) wear surface over the GEOWEB sections to prevent damage to the cell walls.
          5.Compact infill to a minimum of 95 percent Standard Proctor.
          6.Shape compacted surface to required elevation as indicated on the drawings.
          7.Specifier Note: Delete if a Base Stabilization Wearing Surface is not required.
 
          F.Base Stabilization Wearing Surface:
          1.Ensure a minimum 2 in (50 mm) overfill is placed and compacted over the GEOWEB sections prior to placing the wearing surface.
          2.The wearing surface shall be as specified in the Contract Documents.
          ** NOTE TO SPECIFIER ** Include the following paragraph for use with vegetated surface requirement of paragraphs D and G above. Contact Presto Geosystems for assistance. Delete if not applicable.
 
          G.Surface Treatment:
          1.Surface protection shall be installed immediately after placement of the infill material and secured per the Manufacturer's instructions.
          2.Vegetation shall be placed and protected as specified in the Contract Documents.
          3.Install vegetation immediately after the engineered infill is placed.
 
         
END OF SECTION