Amend-0002_W9126G-16-B-0031.pdf

W45VAK61610304 007140

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53.243

Unrestricted Procurement, Gulf Intracoastal Waterw ay, Texas Placement Area Nos. 93 and 112B Rehabilitation and Shoreline Protection in Brazoria and Matagorda Counties, Texas in w hich the response date is rescheduled for 6 Sep 16 @ 2:00 PM (CST) is hereby amended as follow s:

Continued on Page 2.

1. CONTRACT ID CODE PAGE OF PAGES

J 1

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

BY

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer)(Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street, County, State and Zip Code) X W9126G-16-B-0031

X 9B. DATED (SEE ITEM 11)

02-Aug-2016

10B. DATED (SEE ITEM 13)

9A. AMENDMENT OF SOLICITATION NO.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer X is extended, is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN

REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

29-Aug-2016

CODE

US ARMY CORPS OF ENGINEERS FORT WORTH

2000 FORT POINT ROAD

GALVESTON TX 77550-1229

W9126G 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

W9126G-16-B-0031 Page 2 of XX

A0002-2

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

The specifications for Solicitation No. W9126G-16-B-0031, Gulf Intracoastal Waterway, Texas, Placement Area Nos. 93 and 112B, in Brazoria and Matagorda Counties, Texas, Rehabilitation and Shoreline Protection, are hereby amended as follows:

a) Specifications.

(1) SECTION 31 05 21.01 45, MARINE MATTRESS – The enclosed SECTION 31 05 21.01 45, entitled MARINE MATTRESS, supersedes that issued with this Solicitation.

(2) SECTION 35 31 19.10 45, ARTICULATING CONCRETE BLOCK REVETMENTS – The enclosed SECTION 35 31 19.10 45, entitled ARTICULATING CONCRETE BLOCK REVETMENTS, supersedes that issued with this Solicitation

b) Drawings.

(1) NONE

2. This amendment shall be attached to and become a part of the solicitation.

2 Encls:

1. SECTION 31 05 21.01 45, MARINE MATTRESS SECTION

2. SECTION 35 31 19.10 45, ARTICULATING CONCRRTR BLOCK REVETMENTS

SWG FILE NO. :IWW 1150-1126 SOLICITATION NO.:W9126G-16-B-0031

SECTION TABLE OF CONTENTS

DIVISION 31 - EARTHWORK

SECTION 31 05 21.01 45.01 45

MARINE MATTRESS

PART 1 GENERAL

1.1 SUMMARY

1.2 MEASUREMENT AND PAYMENT

1.3 REFERENCES

1.4 SUBMITTALS

1.5 QUALITY ASSURANCE

1.6 DELIVERY, STORAGE, AND HANDLING

1.6.1 Handling

1.6.2 Storage

PART 2 PRODUCTS

2.1 GEOGRID

2.1.1 Geogrid Properties

2.1.1.1 Allowable Strength

2.2 Braid Lacing

2.3 Mechanical Connection

2.4 STONE

2.5 GEOTEXTILE

PART 3 EXECUTION

3.1 FABRICATION

3.1.1 Seams

3.2 STONE FILLING

3.2.1 Filling Method 1

3.2.1.1 Overpacking

3.2.2 Filling Method 2

3.3 INSTALLATION

3.3.1 Subgrade Preparation

3.3.2 On-site Technical Assistance

3.3.3 Placement

3.3.4 REPAIR

-- End of Section Table of Contents --

SECTION 31 05 21.01 45 Page 1

(TO ACCOMPANY AMENDMENT NO. 0002 TO SOLICITATION NO. W9126G-16-B-0031)

SECTION 31 05 21.01 45.01 45

MARINE MATTRESS

AMENDMENT NO. 0002

PART 1 GENERAL

1.1 SUMMARY

The work in this Section includes furnishing labor, equipment, and material for placing (AM#2)8-inch thick marine mattresses as erosion protection. Marine mattresses are rock-filled containers constructed of high-strength geogrid. Geogrid panels are laced together to form mattress-shaped baskets that are filled with small stones. These marine mattresses will be installed partially submerged at Placement Area (AM#2)112B 93 along the GIWW and its installation will be impacted by wind and barge generated waves.

1.2 MEASUREMENT AND PAYMENT

Measurement and payment for marine mattress will be paid for in accordance with provisions of the SECTION 01 22 00.10 MEASUREMENT AND PAYMENT.

1.3 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASTM INTERNATIONAL (ASTM)

ASTM D1388 (2008)Standard Method for Stiffness of Fabrics

ASTM D1777 (1996; E 2011; R 2011) Thickness of Textile Materials

ASTM D4218 (2015) Determination of Carbon Black Content in Polyethylene Compounds by the Muffle-Furnace Technique

ASTM D4595 (2011) Tensile Properties of Geotextiles by the Wide-Width Strip Method

ASTM D4759 (2011) Determining the Specification Conformance of Geosynthetics

ASTM D4873 (2015) Identification, Storage, and Handling of Geosynthetic Rolls and Samples

ASTM D5262 (2007) Evaluating the Unconfined Tension Creep Behavior of Geosynthetics

ASTM D6637 (2011) Standard Test Method for Determining Tensile Properties of Geogrids

SECTION 31 05 21.01 45 Page 2 by the Single or Multi-Rib Tensile Method

GEOSYNTHETIC INSTITUTE (GSI)

GSI GRI GG2 (2014)Geogrid Junction Strength

GSI GRI GG4a (2012) Determination of the Long-Term Design Strength of Stiff Geogrids

1.4 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals Prior fabrication ; G

SD-02 Shop Drawings Installation ; G

SD-03 Product Data Allowable Strength Manufacturer

SD-04 Samples Geogrid

SD-06 Test Reports Geogrid Reinforcement Coefficient of Interaction Interface Friction Testing Splices Conformance Testing

SD-07 Certificates Certificates of Compliance

1.5 QUALITY ASSURANCE

Submit a summary of the manufacturer's qualifications and one copy of the manufacturer's quality control (QC) manual a minimum of 7 days prior to delivery of geogrid to the site. The reinforcement manufacturer shall provide a qualified and experienced representative to be available on an as-needed basis during construction. The representative shall visit the site for consultation at least once during construction.

1.6 DELIVERY, STORAGE, AND HANDLING

Check products upon delivery to ensure that the proper material has been received and is dry and undamaged. Protect the materials from damage and exposure following the guidelines presented in ASTM D4873.

1.6.1 Handling

Handle and unload marine mattress by hand, or with load carrying straps attached to lifting equipment. Marine mattress shall not be dragged.

SECTION 31 05 21.01 45 Page 3

1.6.2 Storage

Protect marine mattress from deleterious materials, chemicals, sparks and flames, temperatures in excess of 160 degrees F , and any other environmental condition that may degrade the physical properties. If stored outdoors, it shall be elevated from the ground surface. Protect marine mattress , except for extruded grids, with an opaque waterproof cover.

PART 2 PRODUCTS

2.1 GEOGRID

Submit one of each properly identified 24 by 24 inches minimum size geogrid samples with the fasteners proposed for use. Provide a geogrid that is a geosynthetic manufactured for reinforcement applications and a regular network of integrally connected polymer tensile elements with sufficient confinement to contain the stone fill materials.

a. Submit manufacturer's certified raw and roll material test reports including ultimate strength performed in accordance with ASTM D6637 or ASTM D4595 (modified) for each test. Test results not meeting the requirements in Table 1 or in the approved Manufacturer's Quality Control Manual will result in rejection of applicable rolls. Provide certified test reports a minimum of 7 days prior to delivery of geogrid to the site.

b. The geogrid structure shall be dimensionally stable and able to retain its geometry under manufacture, transport and installation. The geogrid shall be manufactured with 100 percent virgin resin consisting of polyethylene, polypropylene, polyester, or other approved material and with a maximum of 5 percent in-plant regrind material. Polyester resin shall have a minimum molecular weight of 25,000 and a carboxyl end group number less than 30. Polyethylene and polypropylene shall be stabilized with long term antioxidants.

c. Submit Certificates of Compliance for the materials provided and results of conformance testing. Submit an affidavit certifying raw and roll material test results submitted are accurate and that the reinforcement meets the requirements of the project specifications.

The affidavit shall be signed by an official authorized to certify on behalf of the manufacturer. If the affidavit is dated after award of the contract and/or is not specific to the project, the supplier shall attach a statement certifying that the affidavit addressed to the wholesale company is representative of the material supplied. The documents shall include a statement confirming that all purchased resin used to produce reinforcement is virgin resin. Provide affidavit a minimum of 7 days prior to delivery of geogrid to the site.

2.1.1 Geogrid Properties

The geogrid used for marine mattress shown on the contract drawings shall meet the property requirements listed in Table 1. Reinforcement strength requirements represent minimum average roll values in the machine direction.and shall be determined in accordance with ASTM D4759.

SECTION 31 05 21.01 45 Page 4

TABLE 1

PROPERTY REQUIREMENT

Type I

REQUIREMENT

Type II

UNITS TEST DESIGNATION

True 1% Tensile Modulus

51,400 113,090 lb/ft ASTM D6637

Junction Strength

(MD)

3,330 6,910 lb/ft GSI GRI GG2

Flexural Stiffness 500,000 5,000,000 mg-cm ASTM D1388

Ultraviolet Stability (Retained Strength @ 500 hours

95 95 % ASTM D4355

Minimum Thickness (any dimension)

0.025 .06 inch ASTM D1777

Carbon black content 2 2 % ASTM D4218

2.1.1.1 Allowable Strength

Submit Geogrid allowable strength calculated in accordance with GSI GRI GG4a . The calculations shall itemize each reduction factor.

Account for splice efficiency in the calculations. Provide calculations a minimum of 7 days prior to delivery of geogrid to the site. Allowable strength is based on reduction factors for installation damage, durability, and creep that are applicable to site specific conditions.

Determine reduction factors in accordance with the test procedures documented in GSI GRI GG4a . The minimum reduction factor for durability shall be 1.1 for polyethylene and polypropylene geogrids and 1.15 for coated polyester geogrids. The minimum reduction factor for installation damage shall be 1.1 for all polymers. The reduction factor for creep shall be based on testing performed in accordance with ASTM D5262 at the strain specified in Table 1.

2.2 Braid Lacing

Braided lacing used for tying and lacing the geogrid panels into a mattress with interior compartments should be fabricated of high-density polyethylene eight-strand braid having a nominal diameter not less than 3/16 inch . and a breaking strength not less than 400 lb. The braid must be stabilized against ultraviolet deterioration.

2.3 Mechanical Connection

Braided lacing used for tying and lacing the geogrid panels into a mattress with interior compartments should be fabricated of high-density polyethylene eight-strand braid having a nominal diameter not less than

SECTION 31 05 21.01 45 Page 5

3/16 inch . and a breaking strength not less than 400 lb. The braid must be stabilized against ultraviolet deterioration.

2.4 STONE

Stone for marine mattress shall be in accordance with the SECTION

35 31 19.30 45 STONE FOR MARINE MATTRESS

2.5 GEOTEXTILE

Geotextile for marine mattress shall be in accordance with the SECTION

33 46 13.00 45 GEOTEXTILES USED AS FILTERS.

PART 3 EXECUTION

3.1 FABRICATION

Fabrication consists of assembling the marine mattress not including filling with the stone. Fabrication of the marine mattresses shall be perform by a manufacturer or contractor that has perform that work at other location in project of similar size or larger. Such project shall be at least 5 years old and remain in good working order. Submit prior fabrication location, square footage of marine mattress installation, date in which project was completed, and point of contact information of owner.

3.1.1 Seams

Stitch the seams between geogrid panels to each other using braided lacing. The lacing must be stitched through each pair of apertures along the seam at least once, and the stitches must be sufficiently tight to close the gap between adjacent geogrid panels. The braided lacing must be securely knotted to the geogrid at spacing not to exceed 6 feet along the seam. Terminate the seam by knotting the lacing to the geogrid.

All cut ends of braid material shall be knotted within 1 inch to 2 inch of the end to prevent raveling of the braid material. The braid material shall be securely knotted to the geogrid at all ends of all stitched seams, and at a spacing not to exceed 6 feet along any stitched seam. Pieces of braid material may be spliced end to end by securely knotting.

The stitches along each seam shall be sufficiently tight to close the gap between the adjacent pieces of geogrid. The braid material shall be stitched through each pair of apertures along each seam at least once. The spacing of stitches shall be reasonably uniform at approximately 6 (minimum) stitches per foot along the entire length of each seam.

The joints along the sides of each unit shall be secured by seaming with braid using a lock-stitch configuration to provide complete closure of each unit.

Stitches shall be spaced evenly along each seam, with a minimum of 6 stitches per foot of seam. The braid material shall be securely knotted to the geogrid material at each end of each seam and at a minimum 3-foot spacing along each seam. The ends of each piece of braid used shall be knotted to prevent raveling of the braid. The braiding shall be sufficiently tight to prevent opening greater than 1 inch along the seam, but shall not be cinched so tightly that overlaps and binding result.

SECTION 31 05 21.01 45 Page 6

3.2 STONE FILLING

3.2.1 Filling Method 1

Placed the marine mattress in a jig that supports the mattress vertically with the long dimension lying horizontal. Mattresses compartments shall be filled in lift not to exceed 2.5 feet . The final lift height shall be less than 9 inches high, including a 2 inches overfill on the compartment.

Each lift should be tightly packed, except for the final lift, by rodding and/or vibration. Compacted stone fill should exhibit the following characteristics:

(a) tightly confined stones that will be immobile within the mattress structure,

(b) tensioned interior diaphragms,

(c) snug mechanical connections and seams,

(d) slight bulging of compartments, and

(e) no evidence of air space between compartments during lifting.

3.2.1.1 Overpacking

Avoid overpacking of the compartment that causes excessive bulging of the unit or interior diaphragms, and care must be taken that filling and compacting does not cause excessive damage to the geogrid or laced seams.

Stitching the top panel into place along the entire length completes the mattress filling operation.

3.2.2 Filling Method 2

An alternate filling method is to place the mattress horizontal with the sides and diaphragms held in place with removable wooden forms. Mattresses are filled using a front-end loader, fill is compacted, and the top is then stitched onto the mattress.

3.3 INSTALLATION

Submit marine mattress layout plan along with anchorage and joint details, sequencing and construction procedures, a minimum of 7 days prior to marine mattress placement.

3.3.1 Subgrade Preparation

Immediately prior to placement of the marine mattress and geotextile, the surface on which they will be placed shall be free of rock and other material that could damage the geotextile.

3.3.2 On-site Technical Assistance

Coordinate for a qualified representative of the marine mattress supplier to be present at the job site during the entire first week of installation to provide technical assistance as needed. The Contractor shall remain solely responsible for the quality of installation.

SECTION 31 05 21.01 45 Page 7

3.3.3 Placement

Install the marine mattress in accordance with the Manufacturer's recommendations. Mattress units shall be placed in position at the proper elevation and in the proper alignment. Units should be lifted from the horizontal position in a manner that minimizes severe bending or distortion of the top and bottom geogrid layers. The marine mattress shall maintain fairly uniform tensioning of the geogrid across the width.

The geotextile at the discretion of the Contractor shall be place on the slope prior to installation of the mattress or pre-attached to the marine mattress, in any case the geotextile panels shall overlap a minimum of 18 inches to each other.

3.3.4 REPAIR

Any units damaged during fabrication, filling, or installation shall be repaired in a manner approved by the Contracting Officer or shall be replaced by the Contractor. Any such measures required shall be at no additional cost to the Government.

Provided damage is limited to relatively small areas, seams can be re-laced if the adjacent panels have not separated. If the rock fill has already been compacted, it may not be possible to draw the seam together.

In this case, a patch can be applied by stitching on a section of geogrid.

Damage to the geogrid of filled mattresses should be repaired by stitching on a patch of new geogrid that covers the damaged area with at least 6 in.

overlap in all directions. Damage to the mattress container prior to filling with stone should be repaired by replacing the entire damaged geogrid panel.

Marine Mattresses that have been damaged after being put into service can be either repaired in situ or removed and replaced with new mattresses. In situ repair requires replacing any lost stones and applying a patch as previously described. This should only be done for small breaches of the geogrid or seams, and preferably only on mattresses that are not directly exposed to wave action. In cases where damage covers a wider area, or when two or more mattresses are damaged, it may be possible to remove the damaged mattresses and replace them with new units.

Removal and replacement will be more difficult if the rock fill is not contained during lifting of the mattress. Mattresses placed on sandy bottoms will trap sand in the voids between the rock fill, thus increasing the weight of the mattress to the point that it cannot be lifted out of the water without risking failure of the geogrid or the seams.

-- End of Section --

SECTION 31 05 21.01 45 Page 8

SECTION TABLE OF CONTENTS

DIVISION 35 - WATERWAY AND MARINE CONSTRUCTION

SECTION 35 31 19.10 45

ARTICULATING CONCRETE BLOCK REVETMENTS

PART 1 GENERAL

1.1 SUMMARY

1.2 MEASUREMENT AND PAYMENT

1.3 REFERENCES

1.4 DEFINITIONS

1.4.1 Articulating Concrete Block (ACB) Revetment System

1.4.2 Blocks

1.4.3 Synonymous Naming

1.5 SUBMITTALS

1.6 DELIVERY, STORAGE, AND HANDLING

1.6.1 Blocks

1.7 SCHEDULING

PART 2 PRODUCTS

2.1 ARTICULATING CONCRETE BLOCK

2.1.1 Matrix Assembly - Cabled Systems

2.1.2 Structural requirements

2.1.3 Non-shrink Grouts

2.2 GEOTEXTILE

2.3 CABLE

2.3.1 Installation Requirements for Cable

2.3.2 Fasteners Other than Cable

2.3.3 Design Requirements for Cable

PART 3 EXECUTION

3.1 SUBGRADE PREPARATION

3.1.1 Clearing

3.1.2 Bank Grading

3.1.3 Compaction and Subgrade Finishing

3.1.4 Grade Tolerances

3.1.5 Subgrade Surface Tolerances

3.2 GEOTEXTILE INSTALLATION

3.2.1 General

3.3 BLOCK INSTALLATION

3.3.1 Placement of Pre-Assembled Mattresses

3.3.2 Tolerances

3.4 CONCRETE JOINTS

3.4.1 General Requirements

3.4.2 Abutments

3.5 PROTECTION OF WORK

3.6 CONTRACTOR QUALITY CONTROL

3.6.1 Compliance Inspection

3.6.2 Quality Control Testing

3.6.3 Records

SECTION 35 31 19.10 45 Page 1

-- End of Section Table of Contents --

SECTION 35 31 19.10 45 Page 2

SECTION 35 31 19.10 45

ARTICULATING CONCRETE BLOCK REVETMENTS

AMENDMENT NO. 0002

PART 1 GENERAL

1.1 SUMMARY

The work covered in this Section consists of furnishing plant, labor, equipment, and materials, and performing the operations in connection with the installation of Articulating Concrete Blocks (ACB) in accordance with the lines, grades, design, and dimensions shown and as specified herein.

(AM#2)All ACB to be used shall be 4 inch thick unless otherwise shown or indicated in the plans.

1.2 MEASUREMENT AND PAYMENT

Measurement and payment for articulating concrete block revetments will be paid for in accordance with provisions of the SECTION 01 22 00.10

MEASUREMENT AND PAYMENT.

1.3 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS

(AASHTO)

AASHTO M 288 (2015) Standard Specification for Geotextile Specification for Highway Applications

ASTM INTERNATIONAL (ASTM)

ASTM C1107/C1107M (2014a) Standard Specification for Packaged Dry, Hydraulic-Cement Grout (Nonshrink)

ASTM C140 (2012a) Standard Test Methods for Sampling and Testing Concrete Masonry Units and Related Units

ASTM C42/C42M (2013) Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete

ASTM D4873 (2015) Identification, Storage, and Handling of Geosynthetic Rolls and Samples

ASTM D6690 (2015) Standard Specification for Joint and Crack Sealants, Hot Applied, for Concrete and Asphalt Pavements

SECTION 35 31 19.10 45 Page 3

1.4 DEFINITIONS

1.4.1 Articulating Concrete Block (ACB) Revetment System

A matrix of interconnected concrete block units for erosion protection.

Units are connected by geometric interlock and/or cables, geotextiles, or geogrids, and typically include a geotextile underlayment for subsoil retention.

1.4.2 Blocks

Articulating concrete block revetment units will be referred to as blocks.

1.4.3 Synonymous Naming

The term "Articulating Concrete Block Revetments" is synonymous with "Cellular Concrete Mats" or "Cellular Concrete Matting".

1.5 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. The following shall be submitted in accordance with the SECTION 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Descriptive technical data shall be submitted on the blocks, cables, and cable fittings. Catalog cuts, technical data sheets or test data shall be submitted showing that the products meet the properties specified.

SD-02 Shop Drawings

Block Installation ; G Geotextile Installation ; G

SD-03 Product Data

Articulating Concrete Block ; G

SD-04 Samples

Articulating Concrete Block

1.6 DELIVERY, STORAGE, AND HANDLING

Check products upon delivery to assure that the proper material has been received and is undamaged. For geosynthetics, the guidelines presented in ASTM D4873 shall be followed.

1.6.1 Blocks

Provide blocks that are sound and free of defects that would interfere with proper placement or that can impair the strength or longevity of the installation. Discard blocks with the following defects:

SECTION 35 31 19.10 45 Page 4

(1) Broken appendages.

(2) Chips larger than 2 inches in any dimension.

(3) Cracks wider than 0.02 inches and longer than 33 percent of the nominal height.

Minor cracks, incidental to the usual method of manufacture, or chipping that results from customary methods of handling in shipping, delivery and placement will not be deemed grounds for rejection. Store blocks in a suitable location away from mud, paint, wet cement, and other contamination or disturbance. Blocks shall be handled using a method that will ensure delivery to the site in sound undamaged condition.

1.7 SCHEDULING

To limit ultraviolet light exposure of the geotextile, place the blocks within 7 days after placing the geotextile, and the void filler within 14 days after placing the geotextile.

PART 2 PRODUCTS

2.1 ARTICULATING CONCRETE BLOCK

Submit descriptive technical data on the blocks, cables, cable fittings, soil anchors, and geotextile. Include material properties specified in PART 2 PRODUCTS. Catalog cuts, technical data sheets, or test data shall be submitted showing that the products meet the specifications. The submittal shall also include a copy of standard manufacturer's warranties for the products.

The ACB shall meet the following criteria:

Closed Cell ACBM for Slope Surface Erosion Protection

Criteria Required Value Test Method

Matrix Assembly: Interconnected Cabled System

Thickness, minimum 4 inches N/A

Net Weight/Area, range 35 psf - 45 psf Note a.

Curvature Radius, maximum 4 feet Note b.

Surface Void Area Ratio 5% to 10% Note c.

Block/Geotextile Interface Friction Angle

Note d. ASTM D6690

TABLE 2. Open Cell ACBM for Scour Protection Requirements

Criteria Required Value Test Method

SECTION 35 31 19.10 45 Page 5

TABLE 2. Open Cell ACBM for Scour Protection Requirements

Thickness, minimum 9 inches N/A

Net Weight/Area, minimum 70 psf Note a.

Surface Void Area Ratio 20% Note c.

a. Determine the weight of the mattress per unit area with the nominal joint spacing, in a non-submerged condition.

b. The curvature radius shall be indicative of the ability of the assembled mattress to conform to one dimensional subgrade curves without binding, such as for anchor trenches and swales. The curvature radius shall be demonstrated, if requested by the Contracting Officer.

c. The surface void area ratio shall be determined at the visible (with filled voids) surface of the blocks, with the joints spaced in a neutral position (50 percent), and shall be expressed as a percentage of the gross mat area. The void area shall include area between the blocks and open cells within the block.

d. The concrete surface shall be sufficiently rough to prevent sliding of the blocks on the geotextile. The interface friction shall be matched with the selected block and geotextile combination, and shall be included with the ACBM and Geotextile Data submittal. The block/ geotextile interface friction angle shall be demonstrated, if requested by the Contracting Officer.

2.1.1 Matrix Assembly - Cabled Systems

Cable tied concrete block shall be interconnected by flexible cables running through the blocks. Each block shall be penetrated by a cable that allows articulation of the blocks, but restrains removal of individual blocks. Void filler shall be placed to inhibit lateral movement, cover the geotextile, and increase hydraulic stability.

2.1.2 Structural requirements

Articulating concrete block shall be wet cast using concrete as specified herein, or dry-cast by a vibratory block forming machine. The blocks shall be manufactured to the following requirements:

a. The minimum compressive strength shall be 4000 psi for an average of 3 units, and 3500 psi for an individual unit. Compressive strength shall be determined by ASTM C42/C42M for wet cast blocks, or by ASTM C140 for dry cast blocks.

b. The maximum water absorption for dry cast units shall be 9 pcf for an average of 3 units, and 12 pcf for an individual unit. Water absorption shall be determined by ASTM C140.

2.1.3 Non-shrink Grouts

Grouts shall conform to ASTM C1107/C1107M

SECTION 35 31 19.10 45 Page 6

2.2 GEOTEXTILE

Geotextile for the ACBs shall be in accordance with the SECTION

33 46 13.00 45 GEOTEXTILES USED AS FILTERS.

2.3 CABLE

2.3.1 Installation Requirements for Cable

Cable used for preassembled mattresses shall be sufficiently sized and fastened for the size or weight of the assembled mattresses such that the assembled mattresses can be placed in compliance with OSHA standards. The manufacturer shall be responsible for determining the minimum cable strength compatible with the mattress size for safe handling. Cable strength shall be based on a minimum factor of safety of 5, and include appropriate reduction factors for mechanically crimped cable, and other fasteners. If applicable, loading conditions shall include the use of a spreader bar for placing the mattresses.

2.3.2 Fasteners Other than Cable

Systems that rely on geotextiles (or other fabric integral with the mattress) to maintain block-to-block interconnection shall meet the applicable portions of this specification for cables. Geosynthetics strength shall include appropriate factors of safety, with particular attention given to the grab points.

2.3.3 Design Requirements for Cable

ACB's that rely on cables to maintain block to block interconnection shall use ropes manufactured from polyester. The cable shall have a minimum breaking strength of 7,000 pounds. Polyester rope shall be constructed of high tenacity, low elongating, continuous filament polyester fibers; and shall consist of a core construction comprised of parallel fibers contained within an outer jacket or cover.

PART 3 EXECUTION

3.1 SUBGRADE PREPARATION

Place the ACB revetment on undisturbed native soils, or acceptably placed and compacted fill. Do not place the ACB on surfaces that contain mud, frost, organic soils, embankment that has not met compaction requirements, or where the Contracting Officer determines that unsatisfactory material remains in or under the subgrade.

3.1.1 Clearing

All vegetation shall be completely removed as specified in the SECTION 31 11 00.10 45 CLEARING, GRUBBING, AND REMOVAL OF DEBRIS and 31 14 13.23 45 STRIPPING. Remaining roots from trees and brush shall be removed to a depth of 1 foot below the subgrade surface. Loose roots and twigs, turf clods, stones larger than 1/2 inch diameter, and other debris shall be raked and removed from the final surface. Rills and gullies from erosion shall be corrected.

3.1.2 Bank Grading

Grading shall be finished to a smooth surface, typical of that obtainable

SECTION 35 31 19.10 45 Page 7 with a dozer and blade. A rough surface typically obtained with a backhoe or dragline will not be acceptable , except when ACB placement in water is shown on the drawings or approved by the Contracting Officer. .

3.1.3 Compaction and Subgrade Finishing

Incidental grading (where embankment is not otherwise specified) shall be compacted by heavy equipment or by tamping with a bucket to a density characteristic of the surrounding soils. The final surfaces accessible by compaction equipment shall be compacted with a smooth drum roller or vibratory plate tamper until there is no further evidence of consolidation. Where slopes limit operation of compaction equipment, the final surface shall be back-dragged to a dense smooth surface with bladed equipment. Localized loose or soft zones shall be corrected.

3.1.4 Grade Tolerances

The grading tolerance shall be within 2 inches from the prescribed elevations, with no abrupt variations that would cause unacceptable projections of individual blocks.

3.1.5 Subgrade Surface Tolerances

The subgrade shall be maintained in a smooth condition between installation of the geotextile and the blocks. Windrows, stones, clods of cohesive soil, and irregularities shall be raked smooth. Ruts, rills and gullies resulting from traffic, precipitation runoff, groundwater seepage, etc. shall be corrected prior to installation of blocks.

3.2 GEOTEXTILE INSTALLATION

3.2.1 General

See Paragraph BLOCK INSTALLATION for drawing requirements. Geotextile for the ACBs shall be installed in accordance with the SECTION

33 46 13.00 45 GEOTEXTILES USED AS FILTERS.

3.3 BLOCK INSTALLATION

Placement of blocks shall be in accordance with the manufacturer's recommendations and the Contractor's approved shop drawings. Submit drawings showing details of the ACB and Geotextile Installation, including the block layout patterns in relation to the feature alignment, anticipated locations of cast-in-place concrete joints, mattress junction details, soil anchors, and proposed installation methods for void filling materials, at least 10 days prior to the start of installation of ACB.

3.3.1 Placement of Pre-Assembled Mattresses

Placement of pre-assembled mattresses shall be done with mattresses attached to a spreader bar to aid in lifting, aligning and placing the mattresses. The mattresses shall be placed directly into position, with a maximum space or gap between mattresses of 3 inches in excess of the nominal joint spacing of blocks within the mattress. Mattresses out of alignment shall be lifted and reset. Mattresses shall not be pushed or pulled laterally after they are in contact with the geotextile. No overlapping of mats will be accepted and no blocks shall project vertically more than 1 inch beyond the adjacent blocks. As adjacent mats are placed, they shall be secured to each other by fastening the

SECTION 35 31 19.10 45 Page 8 protruding horizontal and vertical cable connections and end cable loops together along each side of the mats.

3.3.2 Tolerances

Maximum acceptable block projections (vertical offset from adjacent blocks) for "installation in the dry" shall not exceed 1.0 inch for cabled systems . Typical block projections shall be less than half the maximum projections.

3.4 CONCRETE JOINTS

3.4.1 General Requirements

Use of cast in place concrete joints shall be minimized to the extent practicable. The Contracting Officer shall be informed of all concrete joints not shown on shop drawings prior to field placement. Joints that shall require concrete include:

- Joints between cable tied mattresses where the joint is 3 inches wider than the nominal joint.

- Abutments where the ACB meets headwalls, pipe penetrations, or sidewalks.

- Areas where there are partial blocks (to avoid small blocks with reduced hydraulic stability).

Field placed concrete shall be proportioned for similar strength and durability properties as the ACB concrete. Cable ties and anchoring shall be completed prior to placing concrete.

3.4.2 Abutments

The ACB shall abut pipe outlets and other abutments in a neat appearance.

Unless a specific detail is indicated on the drawings, voids shall be filled with partial blocks and the gap shall be filled with cast-in-place concrete. The concrete shall be installed flush with the surface of the blocks, and shall be float finished.

3.5 PROTECTION OF WORK

Work shall be protected against damage from subsequent operations.

Displaced or broken blocks shall be removed and replaced to conform to all requirements of this Section. Damaged material shall not be incorporated. Equipment shall not be allowed on the ACB that could crack, cause abrasion, or otherwise damage the blocks. Vehicles shall not operate directly on geotextile, except that rubber tired vehicles may operate directly on short reaches of geotextile that meets or exceeds AASHTO M 288 survivability requirements for Class 1 geotextile, if there is no rutting, if the vehicle access is necessary to accomplish the work, and if the Contracting Officer observes the operation and approves.

Vehicles shall not operate on the ACB until (during or after) placement of void filler. Vehicle traffic on the ACB shall be restricted to light weight rubber tired vehicles, and where intermittent access is necessary to accomplish the work. Routine haul routes shall not be established on the ACB. These allowances shall not waive the Contractor's obligation to maintain the installation until acceptance, and verify that vehicle access does not crack, or in any way damage, the ACB.

SECTION 35 31 19.10 45 Page 9

3.6 CONTRACTOR QUALITY CONTROL

3.6.1 Compliance Inspection

The Contractor shall inspect for compliance with Contract requirements and record the inspection of operations including but not limited to the following as applicable:

(1) Preparation of surface to receive articulated concrete block.

(2) Individual concrete blocks and geotextile soundness for freedom from defects.

(3) Cables and fittings - breaking strength

(4) Assembly of articulated concrete blocks bound by cables to form mattresses.

(5) Placement of Articulated Concrete Blocks and geotextile on the prepared subgrade.

(6) Tying of cables to reinforcement, concrete paving, and concrete structures.

(7) Embedment of cables and mattresses in side trenches, toe trenches and tie-ins into existing mattresses.

3.6.2 Quality Control Testing

The following testing shall be performed independent of the manufacturing process, by an agency other than the manufacturer. The ACB blocks shall be sampled and tested for compressive strength, water absorption and unit weight. The sample frequency shall be 3 specimens for each 3000 SY . Test methods shall be consistent with those specified in PART 2 PRODUCTS.

3.6.3 Records

A copy of the records of inspections, tests, and corrective action taken shall be submitted as directed.

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SECTION 35 31 19.10 45 Page 10