B.08.03_Amendment_2_Updated_35_31_19.pdf

C-44 Reservoir/STA Project, C-44 Intake Canal - Bank Stabilization (ICBS), Martin County, Florida

SECTION TABLE OF CONTENTS

DIVISION 35 - WATERWAY AND MARINE CONSTRUCTION

SECTION 35 31 19

RIPRAP SYSTEM

PART 1 GENERAL

1.1 REFERENCES

1.2 SUBMITTALS

1.3 INSPECTION COORDINATION

1.4 WARRANTY

1.5 CONSTRUCTION TOLERANCES

PART 2 PRODUCTS

2.1 GENERAL

2.2 GEOTEXTILE

2.3 RIPRAP

2.4 ACCEPTANCE CRITERIA FOR RIPRAP

PART 3 EXECUTION

3.1 CARE OF WATER

3.1.1 Dewatering

3.2 BASE PREPARATION

3.3 GEOTEXTILE

3.4 PLACEMENT OF RIPRAP

3.4.1 General

3.4.2 Placement Technique

3.4.3 Tolerance

3.5 FIELD QUALITY CONTROL

3.5.1 Riprap

3.5.2 Geotextile Damage Evaluation Test Section

3.6 MAINTENANCE

-- End of Section Table of Contents --

SECTION 35 31 19 Page 1 W912EP19R0013 Amendment 0002

SECTION 35 31 19

RIPRAP SYSTEM

PART 1 GENERAL

1.1 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 C127 (2015) Standard Test Method for Density, Relative Density (Specific Gravity), and Absorption of Coarse Aggregate

ASTM C295/C295M (2012) Petrographic Examination of Aggregates for Concrete

ASTM C535 (2016) Standard Test Method for Resistance to Degradation of Large-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine

ASTM C88 (2018) Standard Test Method for Soundness of Aggregates by Use of Sodium Sulfate or Magnesium Sulfate

ASTM D5312/D5312M (2012; R 2013) Evaluation of Durability of Rock for Erosion Control Under Freezing and Thawing Conditions

ASTM D5313/D5313M (2012; R 2013) Evaluation of Durability of Rock for Erosion Control Under Wetting and Drying Conditions

ASTM D5519 (2015) Particle Size Analysis of Natural and Man-Made Riprap Materials

1.2 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 Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Stone Source ; G, DO

For each individual source of stone (quarry) identified by the Contractor as a potential supplier of stone, the Contractor shall

SECTION 35 31 19 Page 2 submit in report format, a Stone Source Submittal. The Stone Source Submittal shall include the information required in SD-06 Test Reports.

The final Stone Source Submittals(s) shall be submitted a minimum of 15 days before scheduling the quarry site examination.

The Stone Source Submittal shall be prepared, signed, and stamped by an independent, state licensed Professional Geologist. Upon acceptance of the Stone Source Submittal and prior to shipping, the Government will schedule a quarry site visit to ensure the information provided in the Stone Source Submittal is accurate.

Work Plan ; G, DO

Submit a plan that details installation methods, sequence of construction, equipment to be used, number of work crews, and schedule, for all work associated with installation of riprap including but not limited to excavation, geotextile, riprap, backfill (if necessary), topsoil, finish grading, seeding, sodding. Include information related to construction of channel stabilization in high seepage locations. Channel stabilization must be completed on a section by section basis. The work plan shall identify the length of each section over which channel work will be completed by each work crew, prior to advancing to the next section of work. Prior to starting of production work, install a test section no longer than 200 feet in order to confirm that the work plan is suitable. Update the Work Plan based on the results of the test section. The Work Plan should be updated and resubmitted for review if site conditions change during execution of work. The test section can be incorporated into the final work provided that material specifications are met, and the work is constructed to the lines and grades shown in the plans.

Geotextile Damage Evaluation Test Section Plan ; G, DO

The Contractor shall submit a plan for Government approval prior to commencement of work to construct a geotextile damage evaluation test section in accordance with paragraph FIELD QUALITY CONTROL below.

Care Of Water Plan ; G, DO

Submit a plan that details how water will be managed during construction. This plan must include means and methods for controlling ground water elevation, means and methods for dewatering areas adjacent to the channel, target groundwater levels during construction, installation and configuration of monitoring wells, means for monitoring surface and ground water levels, and care of surface water.

SD-03 Product Data

Riprap ; G, DO

SD-04 Samples

Riprap ; G, DO

The Contractor shall provide a 10 ton sample of the proposed

SECTION 35 31 19 Page 3 riprap gradation in accordance with paragraph FIELD QUALITY CONTROL below for approval at least 7 days prior to use.

SD-06 Test Reports

Initial Stone Test ; G, DO

Submit certified test reports from a USACE validated laboratory indicating compliance of material qualities identified in paragraphps RIPRAP and ACCEPTANCE CRITERIA FOR RIPRAP. Testing shall be completed at Contractor's expense and shall be submitted in the Stone Source Submittal.

Gradation ; G, DO

Stone gradation based on ASTM D5519 Test Method A: Size-Mass Grading. A representative sample shall be tested to achieve a minimum 2 percent accuracy based on the largest individual piece mass. Test a representative sample and submit a cumulative plot of percent lighter (by weight) versus stone weight in pounds as part of the Stone Source Submittal .

SD-07 Certificates

Testing Laboratory ; G, DO

Furnish documentation indicating that the testing laboratory is USACE validated.

1.3 INSPECTION COORDINATION

Provide access to the work on a continual basis as required for inspection and testing by the Government. Provide 48-hour notice of intention to begin new work activities.

1.4 WARRANTY

The Manufacturer shall warrant the EQUIPMENT, MATERIALS and PRODUCTS specified in this section against defective materials and workmanship with the Manufacturer's standard warranty, but for no less than one year from the date of Substantial Completion, and as described in Section 00700

CONTRACT CLAUSES.

The Contractor shall warrant the work against defects for one year from the date of Substantial Completion and as described in Section 00700

CONTRACT CLAUSES.

1.5 CONSTRUCTION TOLERANCES

The finished surface and stone layer thickness shall not deviate from the lines and grades shown by more than the tolerances within this specification. The outer surfaces shall be even and present a neat appearance. Placed material not meeting these limits shall be removed or reworked as directed by the Contracting Officer. Payment will not be made for excess material which the Contracting Officer permits to remain in place.

SECTION 35 31 19 Page 4

PART 2 PRODUCTS

2.1 GENERAL

Submit source data for riprap. Submit test reports attesting that the riprap materials meet specified requirements.

2.2 GEOTEXTILE

Provide Type 1 Nonwoven Geotextile conforming to the requirements of Section 31 05 19 GEOTEXTILE.

2.3 RIPRAP

Furnish stone that is sound, durable and angular in shape. Stone shall have an elongation (ratio of greatest dimension to least dimension) less than 3:1 and no stone shall have and elongation greater than 4:1.

Material shall be free from cracks, seams, non-mineralized or other defects that would tend to increase its deterioration from natural causes.

Stones shall be graded in size to produce a dense interlocking mass.

Riprap shall consist of dense, natural rock fragments. Stones shall be free from quarry fines, soil, shell material, organic material, and shale seams. Rounded boulders or cobbles shall not be used.

Riprap shall conform to the following gradation :

Type A (6-inch Average Size)

DIAMETER PERCENTAGE PASSING

12-inch 95-100

6-inch 25-75

3-inch 0-10

2.4 ACCEPTANCE CRITERIA FOR RIPRAP

Test Test Method Test Value

Unit Weight ASTM C127 More than 140 pcf (saturated surface dry)

Bulk Specific Gravity ASTM C127 More than 2.38 (saturated surface dry)

Absorption ASTM C127 Less than 5 percent

Sulfate Soundness ASTM C88 Less than 10 percent loss

LA Abrasion ASTM C535 Less than 40 percent loss for 500 revolutions

Freeze and Thaw ASTM D5312/D5312M Less than 15 percent loss for 20 cycles

SECTION 35 31 19 Page 5

Wetting and Drying ASTM D5313/D5313M Less than 2 percent loss for 30 cycles

Petrography ASTM C295/C295M Fresh interlocking crystalline, no clay minerals, and no soluble materials

PART 3 EXECUTION

3.1 CARE OF WATER

Dewatering (pumping of groundwater) may be performed in order to improve bank stability during construction. Construction of riprap, geotextile and associated grading, shall not proceed if the groundwater is greater than 5 feet above the canal water level. Provide dewatering in accordance with the work plan. Monitor water levels, and adjust approach and ground water levels as required to achieve slope stability, at no additional cost to the Owner. Work shall be planned to grade and place materials with water in the canal. Dewatering system shall be designed by the contractor, signed and sealed by an engineer licensed in Florida, and be included with the work plan submittal.

3.1.1 Dewatering

Groundwater is expected to be encountered during slope grading and material placement. The Contractor will be responsible for managing water in accordance with the Care of Water Plan , and updating that plan if site conditions change. Contractor may install a dewatering system to prevent softening and disturbance of subgrade or instability of canal slopes.

Groundwater shall be maintained no more than 5 ft above the canal water elevation when a channel segment is under construction. The water level differential should be further reduced if unfavorable soil conditions are encountered. Some soils on site may cause perched water levels. If this condition occurs, Contractor shall dewater above the perched layer within the work area. Employ dewatering specialist for selecting and operating dewatering system. Keep dewatering system in operation until dead load of riprap system exceeds buoyant uplift force. Dispose of groundwater to an area which will not interfere with construction operations or damage existing construction. Install at least two groundwater monitoring wells (one on each side of dewatering location) in order to demonstrate that the water level difference does not exceed 5 feet (or other applicable differential) along the length of section of channel stabilization under construction. Work area shall not exceed 500 feet in length if dewatering is utilized by the contractor to control water level differentials.

Dewatering shall only be conducted in the immediate vicinity of the work area and at no time shall dewatering be conducted to reduce surface water levels in the Intake Canal. Well installation, operation, and abandonment shall be done in accordance with applicable permit conditions and other regulatory requirements. Shut off dewatering system at such a rate to prevent a quick upsurge of water that might weaken the subgrade.

Should dewatering and surface water drainage systems fail during construction as a result of the Contractor's negligence, inadequate or improper design and operation of the dewatering system, or any mechanical or electrical failure of the dewatering system resulting in damage to excavations, contamination of riprap or bedding stone, or other backfill materials, or the Contractors equipment, the Contractor shall remove and replace all damaged materials to the satisfaction of the Contracting

SECTION 35 31 19 Page 6

Officer at no cost to the Government. If changes to the Care of Water Plan are required due to changing site conditions, and if such changing conditions result in damage to excavations, contamination of riprap, or other backfill materials, or the Contractors equipment, the Contractor shall remove and replace all damaged materials to the satisfaction of the Contracting Officer at no cost to the Government.

3.2 BASE PREPARATION

Areas on which geotextile and riprap are to be placed shall be graded to conform to cross sections shown on the contract Drawings. Excavation and subgrade preparation shall be in accordance with Section 31 00 00 EARTHWORK. Clear the subgrade of sticks, stones, debris and other materials that could puncture the overlying geotextile. The prepared base will be inspected by the Contracting officer prior to placement of geotextile. No geotextile shall be placed on the subgrade, above or below water, without prior acceptance of subgrade conditions by the Contracting Officer.

3.3 GEOTEXTILE

Place Type 1 Geotextile in accordance with the requirements of Section 31 05 19 GEOTEXTILE. The geotextile must be in intimate contact with the subgrade. The Contractor's QC shall inspect, approve, and document approved subgrade areas prior to covering subgrade with geotextile.

Documentation shall be provided with QC daily report. Geotextile shall be placed only on subgrade approved by the Government.

3.4 PLACEMENT OF RIPRAP

3.4.1 General

Place riprap in a manner which produces a well-graded mass of rock with the minimum practicable percentage of voids. Riprap shall only be placed by equipment or means that are identified in the Work Plan . No equipment shall be operated directly on the completed stone protection system.

3.4.2 Placement Technique

Riprap shall be placed to its full course thickness in one operation and in such manner as to avoid displacing or damaging the geotextile. The riprap shall not be installed from a height exceeding that indicated in paragraph COVERING of Section 31 05 19 GEOTEXTILE. The large stones shall be well distributed and the entire mass of stones in their final position shall be graded to conform to the gradation specified in paragraph RIPRAP, subparagraph "General". Placement shall begin at the bottom of the area to be covered and continue up slope. Subsequent loads of material shall be placed against previously placed material in such a manner as to ensure a relatively homogenous mass. The finished riprap shall be free from objectionable pockets of small stones and clusters of larger stones.

Placing riprap in layers will not be permitted. Placing riprap by dumping it into chutes, or by similar methods likely to cause segregation of the various sizes, shall not be permitted. Placing riprap by dumping it at the top of the slope and pushing it down the slope shall not be permitted. The desired distribution of the various sizes of stones throughout the mass shall be obtained by selective loading of the material at the quarry or other source; by controlled dumping of successive loads during final placing; or by other methods of placement which will produce the specified results. Each truckload shall meet the gradation

SECTION 35 31 19 Page 7 requirements. Rearranging of individual stones shall be required to the extent necessary to obtain a well-graded distribution of stone sizes as specified above. However, manipulating stone by means of dozers or other blade equipment shall not be permitted.

Unless otherwise authorized by the Contracting Officer, riprap shall be placed in conjunction with the construction of the ground surface, canal slopes or other adjacent features, earthen features, and with only sufficient lag in construction of the stone protection as may be necessary to prevent mixing of subgrade and stone protection materials. Maintain the stone protection until accepted by the Contracting Officer; any material displaced prior to acceptance due to the Contractor's negligence shall be replaced with no additional payment and to the lines and grades shown on the contract drawings.

All excavation and placement of geotextile, riprap, fill, and sod in a given work section shall be completed prior to starting a new work section.

3.4.3 Tolerance

A tolerance of plus 6 inches and minus 3 inches from the slope lines and grades shown on the contract drawings will be allowed in the finished surface of the riprap, except that the extreme of this tolerance shall not be continuous over an area greater than 200 square feet. The average tolerance of the entire job shall have no more than 50 percent of the tolerances specified above.

3.5 FIELD QUALITY CONTROL

3.5.1 Riprap

Furnish a sample of the proposed gradation of at least ten tons or 10 percent of the total riprap weight, whichever is less, at a location to be determined by the Contracting Officer. Field control of riprap gradation will be by visual comparison of the representative sample to arriving loads. Arriving loads not bearing reasonable similarity to the sample will be rejected. If approved, the sample may be incorporated into the finished riprap at a location where it can be used as a frequent reference for judging the gradation of the remainder of riprap. Any difference of opinion between the Government and the Contractor shall be resolved by dumping and checking the gradation of two random truckloads of stones.

Costs associated with equipment, a sorting site, and labor needed in checking gradation shall be the Contractor's responsibility.

3.5.2 Geotextile Damage Evaluation Test Section

Prior to starting the production work, an evaluation test of the geotextile performance shall be conducted in accordance with the approved Geotextile Damage Evaluation Test Section Plan . The Contractor shall construct a test section to evaluate any damages to the geotextile fabric due to the riprap placement. The test section shall be a minimum of 10 feet by 10 feet, and shall be performed at an area outside of the production as shown on the drawings, or as approved by the Contracting Officer. The test section area shall be stripped of any vegetation cover, and shall be scarified to a minimum depth of 6 inches. The fabric shall then be placed and secured. The area shall be saturated using a minimum of 3,000 to 5,000 gallons of water. No compaction is required prior to the fabric placement. The riprap placement shall be performed from a drop height of 3 feet. Upon completion of the test section, the Contractor

SECTION 35 31 19 Page 8 shall notify the Contracting Officer regarding inspection of the fabric.

The Contractor shall fully remove the placed riprap in the test area to uncover the underlying geotextile. Means and methods of riprap removal shall not damage the riprap or geotextile. The Contractor shall provide notice to the Contracting Officer at least 72 hours prior to uncovering the test sections, and shall leave the observation locations uncovered for no less than 48 hours to allow for inspection by the Government.

3.6 MAINTENANCE

Maintain riprap until accepted. Replace riprap displaced by any cause prior to acceptance.

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SECTION 35 31 19 Page 9