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Presto Geosystems Soil Stabilization System
 
         
SECTION 31 32 00
 
         
SOIL STABILIZATION SYSTEM
 
         
 
         
Copyright 2012 - 2020 ARCAT, Inc. - All rights reserved

          ** NOTE TO SPECIFIER ** Presto Geosystems; Geoweb Soil Stabilization System.
.
** NOTE TO SPECIFIER ** 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.
.
The GEOWEB System is the original three-dimensional cellular confinement 'geocell' system manufactured in the USA from high-quality, high-strength polyethylene. The system offers engineers and architects innovative solutions to challenging soil stabilization problems and improves the performance of structural fill in a wide range of applications from roadways, road shoulders, road bases, stabilization to slope, channel and shoreline protection, storm water detention basins, and vegetated retaining walls. ISO 9001:2015 quality certified. Contributes to green building LEED® credits for reducing storm water runoff, reducing the heat island effect, and reducing site disturbance.
Consult Presto Geosystems for assistance in editing this section for the specific application.
 
          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 [32 0519] - Geosynthetics.
 
          B.Section 02 20 00 - Assessment [31 20 00] - Site Preparation.
 
          C.Section 31 25 00 - Erosion and Sedimentation Controls [31 25 00] - Erosion and Sedimentation Control
 
          D.Section 33 46 13.13 - Foundation Drainage Piping [33 46 00] - Subdrainage System.
 
          E.Section 32 10 00 - Bases, Ballasts, and Paving [32 10 00] - Bases, Ballasts, Pavements, and Appurtenances.
 
          F.Section 32 39 33 - Artificial Rock Fabrications [32 30 00] - Site Improvements and Amenities.
 
          G.Section - [3212 43] - Porous Flexible Paving, Turf Reinforcing Mat.
 
          H.Section 32 90 00 - Planting [32 90 00] - Planting.
 
          I.Section 32 92 13 - Hydro-Mulching [32 92 00] - Lawns and Grasses.
 
          1.3REFERENCES
          ** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
 
          A.AASHTO M 218 - Steel Sheet, Zinc-Coated (Galvanized) for Corrugated Steel Pipe.
 
          B.AASHTO M 288 - Geotextile Specification for Highway Applications.
 
          C.ASTM D 638 - Standard Test Method for Tensile Properties of Plastics.
 
          D.ASTM D 792 - Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacemen
 
          E.ASTM D 1505 - Density of Plastics by the Density-Gradient Technique.
 
          F.ASTM D 1603 - Standard Test for Carbon Black in Olefin Plastics.
 
          G.ASTM D 1693 - Environmental Stress-Cracking of Ethylene Plastics.
 
          H.ASTM D 5199 - Measuring Nominal Thickness of Geotextiles and Geomembranes.
 
          I.ASTM D 5394 - Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics
 
          J.ASTM D 5596 - Standard Test Method for Microscopic Evaluation of the Dispersion of Carbon Black in Polyolefin Geosynthetics.
 
          K.ASTM D 5721 - Standard Practice for Air-Oven Aging of Polyolefin Geomembranes.
 
          L.ASTM D 5885 - Standard Test Method for Oxidative Induction Time of Polyolefin Geosynthetics by High-Pressure Differential Scanning Calorimetry.
 
          M.ASTM D 6693 (Type IV) - Standard Test Method for Determining Tensile Properties of Nonreinforced Polyethylene and Nonreinforced Flexible Polypropylene Geomembranes.
 
          N.ASTM D 7328 - Standard Test Method for Effect of Exposure of Unreinforced Polyolefin Geomembrane Using Fluorescent UV Condensation Apparatus
 
          O.ASTM E 41 - Terminology Relating to Conditioning.
 
          P.U.S. Army Corps of Engineers (USACE) - Technical Report GL-86-19, Appendix A
 
          1.4SUBMITTALS
 
          A.Submit under provisions of Section 01 30 00 - Administrative Requirements [01 30 00] 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 static analysis performed to determine the slope and crest anchorage requirements.
          1.Calculations shall be submitted at the time of bid.
          2.Calculation method shall be based on computer software specific to the Manufacturer's material and accessories. The software shall be founded on sound engineering principles, research/testing and stability analysis.
          3.Provide stability analysis for the infill material based on accredited third party university testing and on the specific infill type. Provide with research summary for the stability analysis specific to the Manufacturer's material.
          4.Minimum overall design factor of safety shall be 1.4.
          ** NOTE TO SPECIFIER ** Delete stake anchorage information if tendons are used.
          5.For stake anchorage systems:
          a.At a minimum; include design conditions, slope stability calculations, calculated factors of safety, friction angles. Provide the number of stakes, stake length, attachment device, and spacing
          b.Provide calculations for the recommended crest anchorage system.
          ** NOTE TO SPECIFIER ** Delete tendon anchorage information if stakes are used.
          6.For tendon anchorage systems:
          a.At a minimum; include design conditions, slope stability calculations, calculated factors of safety, friction angles. Provide the number of tendons, tendon type, load transfer device, and spacing.
          b.Provide the pipe type and diameter, or the minimum anchor pullout strength, and calculations for the recommended crest anchorage system.
          c.Submittal shall be included for the load transfer device including third party testing showing pull through testing exceeding 420 pounds.
          7.Stability 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 Number(s), Resin Density per ASTM D 1505 or D 792, Production Lot Number(s), Material Thickness, Short Term Seam Peel Strength, and percentage of Carbon Black. Submit qualifications certifying the installer is experienced in the installation of the specified products
 
          F.Submit Qualifications for the Installer and Manufacturer's Field representative.
 
          G.Installation Instructions: Manufacturer's printed installation instructions. Include methods for maintaining installed products.
 
          H.Manufacturer's warranty.
 
          1.5QUALITY ASSURANCE
 
          A.Manufacturer ISO Certification: ISO Certification certifying manufacturer's quality management system for its Geoweb system is currently registered to ISO 9001:2015 quality standards.
 
          B.Manufacturer's Field Representative Qualifications:
          1.Manufacturer shall provide a qualified field representative on site at the start of construction to ensure the Geoweb system is installed in accordance with the Contract Documents.
          ** NOTE TO SPECIFIER ** Include the number days required to suit project.
          2.Include on-site time for installation assistance by the Manufacturer's field representative consisting of a minimum of ____ day(s) with one trip including all travel and expenses.
          3.Manufacturer's field representative shall have a minimum 5 years documented installation experience with the specified products in the specified application.
          ** NOTE TO SPECIFIER ** Retain subparagraphs below if required to suit project. Delete if not required.
 
          C.Installer Qualifications: Experienced in performing work of this section and who has specialized in installation of Geoweb System similar to that required for this project.
 
          D.Preinstallation Meeting: Convene a meeting a minimum of two weeks prior to start of soil stabilization system. Verify project requirements, subbase conditions, manufacturer's installation instructions and coordination with other work. Require attendance of parties directly affecting work of this section, including the contractor, engineer, installer, and manufacturer's representative. Comply with Division 1 requirements.
 
          1.6DELIVERY, STORAGE, AND HANDLING
 
          A.Delivery: 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.
 
          C.Handling: Protect materials during handling and installation to prevent damage.
 
          1.7WARRANTY
 
          A.Warranty: Manufacturer's ten year limited warranty.
 
          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.
 
          C.Substitutions: 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. All substitute materials submitted shall be subject to independent lab testing at the Contractor's expense.
 
          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 pound/ft3 (0.935 to 0.965 g/cm3) in accordance with ASTM D 1505 or ASTM D 792.
          b.Environmental Stress Crack Resistance (ESCR): 5000 hours in accordance with ASTM D 1693.
          c.Ultra-Violet light stabilization with carbon black.
          d.Carbon Black Content: 1.5 to 2 percent by weight, through addition of a carrier with certified carbon black content, in accordance with ASTM D 1603.
          e.Carbon black shall be homogeneously distributed throughout material, in accordance with ASTM D 5596.
          f.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 the specified dimensions.
          ** NOTE TO SPECIFIER ** Select GW20V-Cell, GW30V-Cell, or GW40V-Cell type 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 in2 (460 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).
          e.GW40V-Cell
          1)Length: 18.7 inches (475 mm).
          2)Width: 20.0 inches (508 mm).
          3)Nominal Area: 187.0 in2 (1206 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).
          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 D 5199.
          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 in2 (22 to 31 per cm2).
          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)Provide with a slot of 3/8 inch by 1-3/8 inch (10 mm 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, GW30V Cell, or GW40V Cell type and delete others.
          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).
          6)Weld spacing for GW40V-cell sections shall be: 28.0 inches plus or minus 0.10 inch (771 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 E 41.
          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.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.Panel Accessories:
          1.ATRA Tendon Clip: Anchorage connection method for securing sections with tendons and transferring the driving gravity forces to the cell wall.
          a.Molded, high-strength polyethylene device with a locking member and post with minimum pull-through of 420 lbs (191 kg).
          2.ATRA Stake Clip: Installed as an end cap on standard (0.5 inch) and metric (10- 12 mm) steel reinforcing rods to form ATRA Anchors.
          a.Molded, high-strength polyethylene device available in standard 0.5 inch and metric 10- 12 mm versions.
          3.ATRA Key: Used to connect sections together at each interleaf and end to end connection.
          a.Constructed of polyethylene and provides a high strength connection with minimum pull-through of 275 lbs (125 kg).
          b.Metal staples and plastic 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.
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 Anchors:
          1.ATRA Anchors
          a.ATRA Anchors consist of standard (0.5 inch) or metric (10- 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% 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 D 638.
          f.Anchor shall be non-magnetic, non-conducting and corrosion resistant.
          g.Anchor length and placement shall be as shown in the Contract Documents.
          4.ATRA Driver and ATRA Gad
          a.ATRA driver shall be Hilti, Model TE-1000 electric impact hammer.
          b.ATRA gad shall be constructed of heat-treated alloy steel shaft and aluminum head. The head shall fit directly over the arms of the ATRA Anchors or ATRA Speed stakes.
          c.ATRA driver increases installation rates by driving anchors faster while decreasing worker fatigue.
          ** 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.
          a.Bright yellow, high-tenacity, industrial-continuous-filament, polypropylene yarn woven into a braided strap.
          b.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.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.Minimum break strength shall be2090 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.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
          ** NOTE TO SPECIFIER ** Specify infill material type required from the following paragraphs 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.Cell infill material shall be topsoil for vegetated surfaces and shall have an SCS texture of loam, sandy loam or silty loam. Topsoil shall be neither excessively acidic nor alkaline.
 
          B.Cell infill material shall be gravel, crushed aggregate or stone with a maximum particle size of 3 inches (75 mm).
 
          C.Cell infill material shall be concrete with a minimum strength of 3000 psi and air content of 2 to 4 percent in accordance with ACI and ASTM standards.
 
          D.Cell infill material shall be an engineered fill consisting of 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 #5 or similar designation blended with pulverized topsoil and a minimum 30 percent void space for air and/or water.
          2.Mixture will be suitable to promote vegetation growth and provide structural support.
          3.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).
          4.Percentage void space of the aggregate portion when compacted shall be at least 30 percent.
          5.Pulverized topsoil portion shall equal 25 percent of the total volume. Topsoil shall be blended with the aggregate to produce a homogeneous mixture.
          6.Once placed, the mixture shall be compacted to a 95 percent Standard Proctor.
 
          E.Infill material shall be free of any foreign material.
 
          F.Clays and silts are not acceptable infill material.
 
          G.Infill material shall be free-flowing and not frozen when placed in the Geoweb sections.
          ** NOTE TO SPECIFIER ** Include the following paragraph for use with vegetated surface requirement of paragraphs A and D above. Contact Presto Geosystems for assistance. Delete if not applicable
 
          H.Coordinate with vegetation specified in Section 32 92 13 - Hydro-Mulching.
 
          2.4ADDITIONAL COMPONENTS
          ** NOTE TO SPECIFIER ** Edit the following for specific project requirements and delete those that do not apply. Provide surface protection (hydroseed, erosion control blanket or turf reinforcement mat) sized for hydraulic and shear stress conditions to protect against cell wash-out prior to establishing vegetation. A geotextile separation layer may be required to separate the sub grade from infill materials, or when a geomembrane separation layer is used. A geotextile separation layer is typically not required with topsoil infill.
 
          A.Geotextile: Provide geotextile underlayment layer as specified Section 33 46 00 - Subdrainage.
 
          B.Geomembrane: Provide geomembrane layer as specified Section 33 46 00 - Subdrainage.
 
          C.Surface Protection: Provide surface protection shall consist of erosion control blanket as specified in Section -
 
          D.Surface Protection: Provide surface protection shall consist of turf reinforcement mat as specified in Section - .
 
          E.Turf Protection: Provide surface protection of hydroseed as specified in Section 32 92 13 - Hydro-Mulching [32 92 00]
 
          PART 3EXECUTION
 
          3.1EXAMINATION
 
          A.Before beginning installation, verify site conditions are as indicated on the Drawings. Notify the Architect if site conditions are not acceptable. Do not begin preparation or installation until unacceptable conditions have been corrected.
 
          3.2PREPARATION
 
          A.Subgrade: Prepare subgrade and install protection system in accordance with Manufacturer's recommendations.
          ** NOTE TO SPECIFIER ** Coordinate paragraphs below with earthwork specified in Section 32 10 00 - Bases, Ballasts, and Paving.
          1.Prepare subgrade as specified in Section 32 10 00 - Bases, Ballasts, and Paving. Verify subgrade in accordance with porous paving system manufacturer's instructions.
          2.Excavate area allowing for Geoweb thickness and the engineered base depth (where required).
          3.Provide adequate drainage from excavated area if area has potential to collect water, when working with in-place soils that have poor permeability.
          4.Ensure in-place soil is relatively dry and free from standing water.
          5.Uniformly grade base.
          6.Level and clear base of large objects, such as rocks and pieces of wood.
          ** NOTE TO SPECIFIER ** Delete geotextile and geomembrane section below if not required. Contact Presto Geosystems for assistance.
          7.Install geotextile underlayer on prepared surfaces ensuring required overlaps are maintained and outer edges of geotextile are buried in accordance with the Manufacturer's recommendations.
          8.Install geomembrane layer on prepared surfaces ensuring seams are welded and outer edges of geomembrane are buried in accordance with the Manufacturer's recommendations.
 
          3.3INSTALLATION
 
          A.Install and Geoweb sections in accordance with the manufacturer's recommendations.
 
          B.Geoweb Section Anchorage:
          1.Anchor Geoweb sections as indicated in Contract Documents and as directed by the Engineer.
          ** NOTE TO SPECIFIER ** Select the preferred anchorage method from the following paragraphs and delete the those not required. Contact Presto Geosystems for assistance.
          2.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 in Contract Documents.
          c.Drive ATRA anchors at the crest of the slope to secure the Geoweb sections in place and allow expansion of the Geoweb sections into position.
          d.After the Geoweb 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 in Contract Documents.
          f.Fill the anchorage trench with the specified material and compact as indicated in Contract Documents.
          3.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.
          4.Anchorage with ATRA GFRP 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 shown in the Contract Documents.
          c.Drive ATRA GFRP anchors at the crest of the slope to secure the Geoweb sections in place and allow expansion of the Geoweb sections into position.
          d.After the Geoweb sections are expanded as desired, drive ATRA GFRP Anchors so the arm of the ATRA Stake Clip engages with the top of the cell wall. Anchorage pattern and stake length shall be as indicated in the Contract Documents.
          e.Fill the anchorage trench with the specified material and compact as indicated in the Contract Documents.
          5.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.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 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 indicated in the Contract Documents.
          6.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.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.Terminate the bottom of the tendons with ATRA Tendon Clips.
          j.Fill the anchorage trench with the specified material and compact as indicated in the Contract Documents.
          7.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.
          8.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.
          9.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.
          10.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.
          11.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
          12.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.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 in 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.
 
          C.Geoweb Section Placement and Connection
          1.Verify all Geoweb 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 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 ** Select the cell infill type required for load support, slope and channel protection from the following paragraphs and delete those not required. Topsoil Infill is typically not appropriate for load support applications. Contact Presto Geosystems for assistance.
 
          D.Topsoil Infill Placement
          1.Place specified infill in expanded cells with suitable material handling equipment, such as a backhoe, front-end loader, conveyor, or crane-mounted skip.
          2.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.
          3.Fill Geoweb sections from the crest of the slope to toe or in accordance with Engineer's direction.
          4.Infill material shall be free-flowing and not frozen when placed into the Geoweb sections.
          5.Evenly spread infill and tamp into place.
 
          E.Aggregate Infill Placement
          1.Place specified infill in expanded cells with suitable material handling equipment, such as a backhoe, front-end loader, conveyor, or crane-mounted skip.
          2.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.
          3.Fill Geoweb sections from the crest of the slope to toe or in accordance with Engineer's direction.
          4.Infill material shall be free-flowing and not frozen when placed into the Geoweb sections.
          5.Evenly spread infill and ensure the infill is flush with the Geoweb cell walls.
 
          F.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.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.
          6.Concrete shall be flush with the top of the Geoweb walls.
          7.Apply specified finish.
 
          G.Engineered Infill Placement
          1.Place specified infill in expanded cells with suitable material handling equipment, such as a backhoe, front-end loader, conveyor, or crane-mounted skip.
          2.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.
          3.Fill Geoweb sections from the crest of the slope to toe or in accordance with Engineer's direction.
          4.Infill material shall be free-flowing and not frozen when placed into the Geoweb sections.
          5.Evenly spread infill and ensure the infill is flush with the Geoweb cell walls.
          ** 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
 
          H.Surface Treatment:
          1.Vegetation as Specified in Section 32 92 13 - Hydro-Mulching or surface protection Specified in Section - shall be installed immediately after placement of the infill material.
          ** NOTE TO SPECIFIER ** Fertilize, water and cut regularly to encourage root growth and development.
 
          3.4MAINTENANCE
 
          A.Maintain grass in accordance with manufacturer's instructions and as specified in Section 32 92 13 - Hydro-Mulching.
 
         
END OF SECTION