Amendment - Div01 Section 32 91 18.00 12 spec.pdf

SECTION 32 91 18.00 12

HIGH PERFORMANCE TURF REINFORCED MAT (HPTRM)

10/17

PART 1 GENERAL

This Section applies to construction of the Reach 1 Levee.

1.1 SCOPE

The work provided for herein consists of furnishing all labor, materials, equipment, delivery, hauling, and all other incidental work required for surface preparation, HPTRM, HPTRM installation.

1.2 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 D4355/D4355M (2014) Deterioration of Geotextiles from Exposure to Light, Moisture and Heat in a Xenon-Arc Type Apparatus

ASTM D4643 (2017) Standard Test Method for Determination of Water Content of Soil and Rock by Microwave Oven Heating

ASTM D4873 (2002; R 2009) Identification, Storage, and Handling of Geosynthetic Rolls and Samples

ASTM D6524 (2000) Measuring the Resiliency of Turf Reinforcement Mats (TRM's)

ASTM D6525 (2000) Measuring Nominal Thickness of Permanent Erosion Control Product

ASTM D6566 (2000) Measuring Mass per Unit Area of Turf Reinforcement Mats

ASTM D6567 (2000) Measuring Light Penetration of Turf Reinforcement Mats

ASTM D6818 (2002) Ultimate Tensile Properties of Turf Reinforcement Mats

1.3 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

Surface Preparation Plan; G

The Contractor shall submit a detailed, Surface Preparation Plan.

The Contractor shall include all equipment, method for breaking the ground surface, and intended stockpile locations of excavated trench materials, as required in accordance with paragraph "Surface Preparation".

HPTRM Installation Plan; G

The Contractor shall submit a detailed, HPTRM Installation Plan, for HPTRM Installation as required in accordance with paragraph "HPTRM Installation". The work plan shall include all equipment and methods for installing HPTRM. The plan shall also include, but not limited to, the following:

a) Detailed layout plan for Percussion Driven Anchors (PDA) and securing pin locations, spacing along the slopes, and spacing within the anchor trenches.

b) Detailed narrative and illustrations of PDA installation.

Equipment and methods used for driving the PDA, tendon pulls, and cutting of the tendons. Narrative shall include a time frame for placing HPTRM ahead of seeding.

c) A detailed layout plan of the HPTRM panels.

d) Method for placing mats and overlapping for the curved and straight sections of the levee.

Pull-Out Test Plan; G

The Contractor shall submit a detailed Pull-Out Test Plan, for the "pull-out" tests required to be conducted on the PDAs. The plan shall include all equipment, methods, and procedures to be used for a "pull-out" test in accordance with paragraph, "Quality Control".

SD-04 Samples

HPTRM Samples; G

The Contractor shall submit a sample of the HPTRM product for approval. The sample shall be labeled with manufacturer's name, product name, and shall have a minimum size of 12 inches by 12 inches.

Securing Pins and Percussion Driven Anchors; G

The Contractor shall submit one securing pin and one fully assembled PDEA anchor sample for final approval to ensure they meet, or comply, with the specified requirements as described in paragraph "Percussion Driven Anchors (PDA)". All securing pins and PDEA shall be provided by the HPTRM manufacturer.

SD-07 Certificates

HPTRM Manufacturer's Certificate; G

The Contractor shall provide a certificate stating the name of the HPTRM manufacturer, the product name, chemical compositions of filaments or yarns and other pertinent information to fully describe the HPTRM, securing pins, and PDA devices. The manufacturer's certificate shall state that the furnished product meets all specification requirements as stated in the Minimum Levee Construction and Armoring

Minimum Average Roll Values (MARV) table shown in paragraph, "High Performance Reinforcement Mats (HPTRM)", and is evaluated under the manufacturer's quality control program. Each certificate shall be attested to by a person having legal authority to bind the manufacturer. The HPTRM Manufacturer's Certificate shall be provided with the HPTRM Sample and with each roll or pallet of rolls of HPTRM delivered to the project site.

1.4 DELIVERY, STORAGE, AND HANDLING

Product labeling, shipment and storage of the HPTRM product shall be in accordance with ASTM D4873. Product labels shall clearly show the manufacturer or supplier name, style name and roll number, with width and length. Each shipping document shall include a notation certifying that the material is in accordance with the HPTRM manufacturer's certificate on each roll or pallet of rolls and meets the requirements specified within and as shown on the drawings. The Government will reject the HPTRM without this printed certification on the individual roll. Each HPTRM roll shall be wrapped with a material that will protect the HPTRM from damage due to shipment, water, UV sunlight, and contaminants. The protective wrapping shall be maintained during periods of shipment and storage. During storage, HPTRM rolls shall be adequately covered to protect them from site construction damage, chemicals that are strong acids or strong bases, flames, sparks, temperatures in excess of 160 degrees F, sunlight exposure and any other environmental condition that might cause damage.

1.5 QUALITY CONTROL

The Contractor shall establish and maintain quality control for the HPTRM and installation of HPTRM to assure compliance with contract requirements.

The Contractor shall maintain records of quality control for all installation operations including, but not limited to the following:

(1) Equipment. Type, size, and suitability of equipment for the installation of the prescribed work.

(2) All submittals as required in accordance with paragraph "SUBMITTALS".

(3) Periodic quality control checks conducted by the Contracting Officers Representative throughout the installation process. Periodic quality control checks shall include the inspection of the HPTRM layout, minimum anchor and pin spacing in accordance with the "HPTRM Installation Plan", HPTRM defects or damages, pin and PDA installation, and tightness of anchor caps prior to cutting wire tendons. HPTRM defects or damages shall constitute any rips, tears, melted deformations, holes, loosely formed mesh, or thickness inconsistencies.

(4) Pull-out Test. The Contractor shall submit a Pull-Out Test Plan. The Contractor shall conduct anchor "pull-out" tests for the installed PDAs per manufacturer's recommendations. The "pull-out" tests will be observed by the Contracting Officer's Representative. The Contracting Officer's Representative will randomly select two (2) "pull-out" tests per every 1,000 PDA anchors placed. Each PDA shall have a "pull-out" load strength capacity of a minimum load of 200lbs. The Contractor shall submit a "Pull-Out Test Plan" for approval. The Contractor shall coordinate the "pull-out" tests with the Contracting Officer's Representative. After the "pull-out" tests are performed, the anchor shall be left in place and the tendon cut to ground surface. A new anchor shall be driven and set adjacent thereto. If the result of a "pull-out" test indicates that the PDA has not met the minimum pull-out resistance, the Contractor shall:

a. Perform a pull-out test on the adjacent PDAs on both sides of the failed PDA, or at the location directed by the Contracting Officer. If the two adjacent PDAs provide the minimum pull-out resistance, no further action is required other than installing and setting new PDAs adjacent to the tested PDAs.

b. In the event that any of the adjacent PDAs fail to meet the minimum pull-out resistance, the Contractor shall conduct multiple "pull-out" test on the surrounding PDAs in all directions until a boundary is established to the point where the PDAs can obtain a pull-out test that meets the minimum resistance. The Contracting Officer may at any point require additional "pull-out" tests.

c. Once the boundary is established and as directed by the Contracting Officer, the Contractor shall provide a report with the results obtained from each "pull-out" test conducted. The results of each "pull-out" test shall include all data as required in accordance with the attached "Pull-Out Test Method and Procedures." The report shall include drawings that show the locations of the PDAs that did not pass the "pull-out" test and the location/boundary where the PDAs passed the "pull-out" test.

d. The Government will review the report of the multiple "pull-out" test failures and determine the corrective measures. If the PDAs that did not meet the minimum resistance are not the result of improper installation by the Contractor, the Government will provide corrective measures that shall be made.

e. In the event the PDAs that failed the "pull-out" tests are determined to be a result of the Contractor's improper installation, the Contractor shall submit the Contractor's intended correction measures plan for Government approval. The Contractor's correction measures plan shall include the HPTRM manufacture's recommendations for corrective measures and any additional information required by the Contracting Officer. Work conducted for corrective measures due to the Contactor's improper installation of the PDAs shall be at no additional cost to the Government.

(5) HPTRM Field Material Tests: The Contractor shall conduct field material testing of the HPTRM thickness and tensile strength, for both machine direction (MD) and cross machine Direction (XMD), to ensure that the HPTRM thickness and tensile strength is in accordance with the requirements as stated in the Minimum Average Roll Values (MARV) table shown in paragraph "High Performance Reinforcement Mats (HPTRM)". Testing of the HPTRM thickness shall be done in accordance with ASTM D6525. Testing of the HPTRM tensile strengths shall be done in accordance with ASTM D6818. Testing shall be as follows:

1. The first shipment of HPTRM delivered to the project site will require a sample of HPTRM for field material testing.

2. After which, for every 28,000 SY of HPTRM delivered to the site, one

(1) sample of HPTRM will require field material testing.

3. For every 2,000 LF of HPTRM installed, measured along the levee centerline, one (1) sample of HPTRM will require field material testing unless otherwise directed by the Contracting Officer. In the event that the HPTRM material tests indicate the sample does not meet the required thickness and/or tensile strengths, the test is considered a failed test. The government will reject the HPTRM in the event of a failed test. If the HPTRM is rejected, as the result of a failed test, the Contractor shall submit a corrective action report for government approval and replace the HPTRM at no additional expense to the Government. The Contracting Officer reserves the option to change the location of any field tests and direct the Contractor to increase or decrease the frequency of sampling and testing in the event of failed tests. The Contractor shall collect all samples as directed and perform all tests at no additional expense to the Government. The requirements for the HPTRM material testing shall be as follows:

a. Testing Laboratory. The Contractor shall retain the services of a laboratory that is accredited by the Geosynthetic Accreditation Institute (GAI) and approved by the Government. The laboratory shall perform only tests for which it is accredited. The Contractor shall submit the proposed laboratory(s) for approval by the Contracting Officer. All laboratory facilities, personnel, and equipment used for testing shall be part of a validated laboratory that has been inspected or audited by the USACE Materials Testing Center, Vicksburg, MS.

b. Sampling and Testing. The Contractor is required to take the required samples to be tested. The collection of the HPTRM Samples will be observed by the Contracting Officer. Sample size shall be as required in accordance with ASTM D6525 and ASTM D6818 to perform the specified tests. The sample location shall be cataloged to correspond with the levee baseline station from which the sample was taken. All samples shall be cataloged to correspond with the manufacturer's roll or lot number.

c. Test Results. Test results shall be furnished to the Contracting Officer no later than 10 days after sampling. All samples taken shall be cataloged to correspond to the manufacturer's roll or lot number and the location of that roll with respect to the levee centerline stationing.

d. Acceptance Requirements. The Contractor shall furnish to the Contracting Officer, in duplicate, a certificate or affidavit signed by the testing laboratory. The certificate shall contain the signer's title, name and address of the testing laboratory, contract number, and project name and location. The certificate or affidavit shall attest that the HPTRM meets, or does not meet, the required HPTRM thickness and tensile strength for MD and XMD. The testing certificate shall be provided with a report which includes all information as stated in ASTM D6818, paragraph 11 Report. The report shall contain a table for tensile elongation of machine direction and cross-machine direction in percent and pounds per inch. The report shall also include a plot of the stress/strain curve with clearly marked strengths at 5 percent and ultimate, in pounds per inch.

(6) The Contractor shall ensure that the Manufacturer conducts one (1) field visit per every 25,000 SY of HPTRM placed for the manufacturer to certify installation.

(7) The Contractor shall provide all documentation of all areas of HPTRM that are repaired or replaced in accordance with paragraph "DAMAGED HPTRM

AREAS".

(8) The Contractor shall provide a HPTRM Manufacturer's Certificate stating the name of the HPTRM manufacturer, the product name, chemical compositions of filaments or yarns and other pertinent information to fully describe the HPTRM, securing pins, and PDA devices. The manufacturer's certificate shall state that the furnished product meets all specification requirements as stated in the Minimum Levee Construction and Armoring

1.5.1 Reporting

The original and two copies of these records, as well as the records of any corrective action taken, shall be furnished to the Government for each manufacturer's product installation. Format of report shall be as prescribed in the Section 01 45 00.10 10 CONTRACTOR QUALITY CONTROL.

PART 2 PRODUCTS

2.1 MATERIALS

2.1.1 High Performance Reinforcement Mats (HPTRM)

The HPTRM, as defined by the Erosion Control Technology Council (ECTC), EPA Stormwater Technology Fact Sheet, Turf Reinforcement Mats and FHWA FP-03, shall consist of non-degradable synthetic fibers, monofilament's, mesh and/or other elements, processed into a three dimensional matrix; shall be woven polypropylene or polyester geo-grid, both of which are specially designed for erosion resistance on levees with steep slopes. The HPTRM shall support the growth of grass roots through the material. The HPTRM shall be certified to meet the high tensile strength of a minimum 4000 pounds per foot in the machine direction and a minimum tensile strength of 3,000 pounds per foot in the cross direction. HPTRM shall preferably have a dense, closely woven homogenous matrix not composed of layers or discontinuous material, and not held together by stitching or glued netting. All components of the HPTRM, including HPTRM mats, securing pins, and Percussion Driven Anchors (PDAs), within each levee reach shall be furnished by one manufacturer. There shall be no overlapping of HPTRM mats, anchors, pins, from different manufacturers. The manufacturer of the HPTRM system shall have a documented history, and shall furnish documentation, of HPTRM system installations totaling more than 25,000 square yards of the same components, and the manufacturer shall have manufactured the system for more than 3 years. HPTRM shall meet or exceed the following requirements:

Property Test Method Value

Tensile Strength (MD) X

(TD)1

ASTM D6818 4000 lb/ft x 3000 lb/ft

Elongation (MD) x (TD)2 ASTM D6818 < 25% x < 20%

Tensile Strength (MD) x (TD) @ 15% Strain2

ASTM D6818 3000 lb/ft x 3000 lb/ft

Initial Tangent Modulus (MD) x (TD)2

ASTM D6818 10.5 kip/ft x 17.5 kip/ft

UV Stability2 ASTM D7238 (@6,000 Hours) 90%

Vegetation Establishment2 ASTM D7322 >400%

Property Test Method Value

Maximum Permissible Vegetated Shear Stress

ASTM D6460 17 psf

Maximum Permissible Vegetated Velocity

ASTM D6460 25 fps

Permissible Vegetated Shear Stress @ 20-30% Coverage

ASTM D6460 5 psf

Permissible Vegetated Velocity @ 20-30% Coverage

ASTM D6460 12 fps

Permissible Vegetated Shear Stress @ 60-70% Coverage

ASTM D6460 12 psf

Permissible Vegetated Velocity @ 60-70% Coverage

ASTM D6460 16 fps

HEC-15 (Tau-veg/Tau-TRM) ASTM D6460 0.26

1) MARV/MIN 2) Typical

In addition to the above, the material data sheets need to be approved and accepted by the Government before use

2.1.2 Roll Size

The width of HPTRM rolls shall be in accordance to the HPTRM manufacturer's recommendations. Seems/splicing, in any direction, will not be permitted for HPTRM. Overlapping of HPTRM rolls shall only be permitted perpendicular to the levee centerline. The roll lengths shall be determined by the Contractor to minimize waste and avoid any seams parallel to levee crown.

The Contractor shall verify with the manufacturer the exact roll length prior to ordering HPTRM. HPTRM rolls shall have a continuous length required to cover the full length of the HPTRM limits from the flood side anchor trench to protected side anchor trench. The fabric shall extend across the full levee section and wrap within trench in accordance with the details shown on the contract drawings. If the exact field length is less than the roll length determined by the Contractor, the Contractor will be required to cut fabric to corrected field length. If the roll length determined by the Contractor is shorter than the actual field length, the Contractor shall, at no expense to the Government, replace these rolls with the required rolls at the correct lengths. Horizontal splicing shall not permitted.

2.1.3 Securing Pins and Percussion Driven Earth Anchors

2.1.3.1 Securing Pins

Metal securing pins shall be obtained from the manufacturer of the HPTRM and shall have a minimum 8-inch drive depth. Pins shall be galvanized to provide longer life and be shaped to provide greater resistance to pullout. Metal securing pins shall be in accordance with the manufacturer's specifications and shall be approved by the Contracting Officer. Acceptable hardware shall have demonstrated 150 pound pullout resistance in loam soil and laboratory conditions.

2.1.3.2 Percussion Driven Anchors (PDA)

All PDAs shall be obtained from the manufacturer of the HPTRM. All PDAs shall have a minimum initial embedment depth from existing ground of 40 -inches, allowing for the approximate 4-inch pull-out upon setting the anchor, leaving a net 36-inch embedment depth. The Contractor shall ensure that the manufacturer certifies the PDAs have a minimum "pull-out" load strength capacity of 200-lbs. PDAs shall be fully assembled and ready for installation when delivered to the project site. The PDAs shall be submitted for government approval and shall be in accordance with the HPTRM manufacturer's specifications and shall also meet the following minimum requirements:

a. Anchor: The anchor on the PDA shall be aluminum alloy, or hard anodized aluminum alloy, and shall have a minimum dimension length of 3.15-inch and minimum dimension width of 1-inch.

b. Lower Termination: The lower termination shall be capable of accommodating the load generated by the PDA. The end of the wire tendon shall be joined with corrosion resistant metal ferrules.

c. Wire Tendon: The wire tendon shall be galvanized steel or stainless steel capable of accommodating the load generated by the PDA.

d. Top Accessory: The top accessory shall be capable of accommodating the load generated by the PDA. The top accessory shall have a minimum diameter of 3.5-inches and shall not exceed 1/4-inch in height.

e. Top Termination: The top termination shall be corrosion resistant metal and capable of accommodating the load of the generated by the PDA. Plastic components within the internal locking mechanism of the metal top termination will be permitted. Top terminations shall be self locking and flush with the top accessory. Top terminations that stick out above the top accessory will not be permitted.

2.1.3.3 Delivery Storage and Handling

The securing pins and PDA shall be delivered to the jobsite fully assembled and ready for installation. The Contractor shall obtain from each manufacturer, a print-out affixed to each pallet, roll, or box of securing pins and PDA in accordance with the following: Product name, manufacturer, roll or lot number, and the phrase "Certified to USACE levee armoring requirements". Products without these markings will be rejected.

2.1.4 Non-Woven Geotextile Underlayment

The geotextile shall be a nonwoven, staple fiber, needle punched, polypropylene geotextile; the fibers are needled together to form a stable network that retains dimensional stability relative to each other.

The geotextile shall be resistant to UV degradation and biological and chemical environments normally encountered in soils.

The geotextile shall meet the following Minimum Average Roll Values (MARV) for non-woven geotextile.

Property Test Method Value

Grab Tensile Strength ASTM D4632 250 (1.112)

Elongation ASTM D4632 50

Trapezoidal Tear ASTM D4533 100 (0.444)

CBR Puncture ASTM D6241 700 (3.113)

Apparent Opening Size ASTM D4751 100 (0.150)

Permittivity ASTM D4491 1.2

Water Flow Rate ASTM D4491 80 (3251)

UV Resistance ASTM D4355 70 @ 500 Hours

2.2 LEVEE FILL BACKFILL

2.2.1 Material

All trenches and/or excavations shall be backfilled with embankment material obtained from (1) the excavation of the anchor trenches, (2) a combination of excavated materials from the trenches and new Contractor furnished embankment material, or (3) new Contractor furnished embankment material. All backfill material for the excavation of the trenches and new embankment materials shall be classified as CH or CL in accordance with Section 35 41 00.01, "LEVEE CONSTRUCTION". Any debris deeded unsuitable by the Contracting Officer representative, shall be removed from the excavated material prior to backfilling operation and properly disposed.

2.2.2 Compaction

The trench shall be free of standing water and allowed a drying period, prior to trench backfilling operation. Material used for trench backfill shall be processed for drying prior to placement and compaction. Trench backfill material shall have moisture content within the limits of plus 5 to minus 3 percentage points of optimum moisture content determined from ASTM D4643. Trench backfill material shall be compacted by making a minimum of four complete passes over each placement of trench material. A pass shall consist of operating compaction equipment over the entire surface of the each placement of trench material. Each placement of trench material being compacted shall be completely covered utilizing the approved compaction equipment, prior to beginning a new pass. The Contractor shall use compaction equipment and procedure, as approved by the Contraction Officer.

2.2.3 Water Side Stockpile Area Repair

The area (in the vicinity of the flood side anchor trench) where excavated material was stockpiled for reuse in the backfilling operation shall be graded by adding new embankment to the levee slope. Upon completion of grading the area, the Contractor shall be required to conduct, seeding operations immediately after and prior to pre-final inspection in accordance with Section 32 92 19, "SEEDING."

PART 3 EXECUTION

3.1 GENERAL

The Contractor shall minimize the disturbance of the existing levee design section during the surface preparation. No degrading of the existing levee will be allowed. Should the Contracting Officer's Representative determine that an area/s has been degraded or cut during surface preparation operations, the Contractor will be solely responsible for any and all damages, and shall repair/restore the deficient area/s by adding suitable embankment in accordance with Section 35 41 00, "LEVEE CONSTRUCTION".

3.2 SURFACE PREPARATION

The Contractor shall prepare the ground surface for installation of HPTRM within the limits shown on the contract drawings. The Contractor shall submit a "Surface Preparation Plan" for approval by the Contracting Officer. The general guidelines for surface preparation procedures are as follows:

1) The ground surface shall be broken by raking, or with other approved methods, to a maximum depth no greater than 2-inches and no less than a minimum depth of 1.5-inches. Breaking of the ground surface is defined as loosening the hard ground surface to provide a loose top layer of soil and thatch to accommodate the successful establishment of seed.

The method for breaking the ground surface other than raking shall be approved by the Contracting Officer. Disking the ground surface will not be permitted.

2) The broken ground surface shall be smoothed prior to placement of the HPTRM. Seed after smoothing.

3) The anchor trenches shall be excavated to the limits and details in accordance with the contract drawings and manufacturer's recommendations. Trench excavation shall have a tolerance of 2 inches or greater in either direction. Excavated earthen material shall be stockpiled adjacent to trench alignment and re-used to backfill for the anchor trenches during HPTRM Installation if the excavated material meets the requirements per Section 35 41 00.01 "LEVEE CONSTRUCTION".

3.3 EXCESS MATERIAL

The Contractor shall remove and dispose of all rocks, sticks or roots, soil clods, vegetation, material unsuitable for levee embankment, and other sharp objects that could keep HPTRM from general contact with existing ground by a "hand-picking" operation to be conducted by the Contractor's personnel.

3.4 HPTRM INSTALLATION

Once surface preparation is complete and is approved by the Contracting Officer, the Contractor shall install the HPTRM and non-woven geotextile underlayment between the limits shown on the contract drawings. The Contractor shall submit a "HPTRM Installation Plan" for approval by the Contracting Officer. The general guidelines for HPTRM installation are as follows:

(1) Place the HPTRM roll on the constructed Phase 2 levee crown with the non-woven geotextile underlayment beneath and anchor the HPTRM and non-woven geotextile underlayment in the flood side anchor trench. Then roll the HPTRM to extend down protected side slope perpendicular to levee centerline all the way to the flood side anchor trench. Field adjust to ensure the mat is perpendicular to the levee centerline and is flush with the ground surface. All irregular humps due to sub-surface debris shall be removed prior to anchoring.

(2) Install securing pins and PDA anchors per paragraph, "PDAs and Securing Pins Placement". The Contractor shall ensure that the HPTRM remains taut by locating anchors in the trenches that pull the fabric tighter. The Contractor shall install pins and anchoring devices, beginning at the top of the slope and working downward to the levee toe, while pushing-out wrinkles /irregularities in the material. The Contractor shall ensure that the anchors are properly set when setting the anchors. After anchorage, irregular humps or expansion in material due to weather shall require additional pinning to flatten the fabric to the ground.

(3) Place adjacent rows of HPTRM as stated above by overlapping the edges perpendicular the levee centerline. Overlaps shall be in accordance to paragraph, "HPTRM Overlaps". Splicing together two rolls creating a seam parallel to the centerline of the levee will not be allowed.

(4) Once all rows of securing pins and PDA Anchors have been installed, the Contractor shall secure each end of the HPTRM by backfilling the flood side and protected side anchor trenches with compacted embankment in accordance with paragraph "TRENCH BACKFILL" and in accordance with the details shown in the contract drawings. Backfill shall be even with existing grade after compaction.

(5) Seed under and over the completed HPTRM sections. See shall be installed in accordance with Section 32 92 19, "SEEDING". Seeding shall not be installed until the "pull-out" tests of the PDAs have been completed and approved by the Contracting Officer. The Contractor shall be allowed to use either rubber tired or rubber tracked lightweight power equipment for placement of turfgrass sod. The Contractor shall avoid sharp turns on installed material. Tracked heavy equipment will not be allowed on the HPTRM during or after installation. Heavy equipment is defined as creating a deformation in the surface greater than 1-inch. If damage due to equipment use occurs, the Contractor shall repair or replace all damaged areas in accordance with paragraph

"DAMAGED HPTRM AREAS".

3.5 HPTRM OVERLAPS

HPTRM shall be installed in accordance with following:

Overlap 6 in

Overlap(Curved) 6 in

Overlap(Repair) 6 in

The overlaps stated above are minimum values. If the HPTRM manufacturer requires a greater minimum overlap than what is stated above, the manufacturer's minimum overlap shall be met. Panel overlap will only be permitted perpendicular to the levee crown centerline. Seems/splicing of HPTRM will not be permitted.

3.6 PDAs AND SECURING PINS PLACEMENT

The Contractor shall include the locations and layout of the PDAs and securing pins in the "HPTRM Installation Plan" for approval by the Contracting Officer. The general guidelines for the locations and placement of the PDA and securing pins, assuming 10 foot panel widths, are listed below. If the Contractor elects to deviate from a 10-foot panel width after award of the contract, the PDA and pin placement spacing shall not exceed the spacing specified below in subparagraphs a) though d). The PDA layout pattern for panel width to be used shall be submitted for review and approval by the Contracting Officer.

a) Along the bottom of the anchor trenches, PDAs shall be placed every 5-feet on center along the levee side edge of trench as shown on the plans. Securing pins shall be placed every 1-foot on center between the PDAs.

b) Along the panel overlaps perpendicular to the levee centerline, PDAs shall be placed every 4-feet on center. Securing pins shall be placed every 1-foot on center between the PDAs.

c) Along the levee crown edges and change in slope transitions, horizontal to the levee centerline, the PDAs shall be placed every 5-feet. Generally, one PDA at panel overlap, then every 5-feet.

Securing pins shall be placed 2.5-feet between the PDAs.

d) Placement of PDAs against levee surface shall be 5-feet on center in the horizontal and vertical direction. Securing pins shall be placed 2.5-feet between the PDAs.

3.7 DAMAGED HPTRM AREAS

In the event of damaged HPTRM resulting from installation operations, the Contracting Officer will determine if the damaged area will require replacement of the roll/panel of HPTRM that was placed, or if the damaged HPTRM can be repaired depending on the severity of the damage. Damaged HPTRM areas shall be repaired in accordance with the contract drawings. For any area of HPTRM required to be repaired, the Contractor shall submit a repair plan for approval by the Contracting Officer. The repair plan shall show the location of the damaged area, size of the damage/tear of the HPTRM, the placement of new HPTRM materials if required, and the layout of the pins and PDAs for the damaged area to be repaired. Repairs or replacement of damaged HPTRM area(s) shall be at no additional expense to Government.

3.8 REPAIR OF EXISTING LEVEE AND ACCESS

The Contractor shall return all disturbed and rutted embankment areas resulting from the hauling operations or the staging of equipment and supplies, to pre-installation of HPTRM mats condition. Embankment material shall be added to deficient area/s and graded to match the adjacent surface, if so directed by the Contracting Officer. All embankment damages shall be repaired, seeded and fertilized upon completion of all installation work and prior to leaving the job site. No separate payment will be made for embankment repairs. All cost associated with embankment repair/s shall be distributed in incidental Pricing Schedule items. All seeding for repair work shall be done, measured, and paid for in accordance with Section 32 92 19,"SEEDING".

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