A06_Aggregate_Surfacing.pdf

Rehabilitate the Old El Portal Debris Basin, Gabion, and Service Road Specifications 5/2025

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AGGREGATE SURFACING

SECTION 32 15 00

PART 1 GENERAL

1.1 WORK SUMMARY

A. This section covers the requirements to perform work including but not limited to the operations to furnish, transport, place, grade and compact aggregate surfacing for all the applications as shown on the Drawings and as specified for the work.

B. Provide all labor, materials, tools, equipment, services, and incidentals as necessary to perform the work as described in this section and in accordance with the Contract Documents and Drawings and to the satisfaction of NPS.

1.2 RELATED WORK

A. Attention is directed to the General Requirements and related work specified in other sections includes, but is not limited to:

1. Section 32 11 00, Base Courses

1.3 DEFINITIONS

A. Not Used.

1.4 SUBMITTALS

A. Submittals shall be in conformance with Contracting Requirements, Specifications, and Division 1 - General Requirements.

B. At least 14 days prior to placement of any aggregate surfacing materials in the work, the Contractor shall submit supporting documentation to indicate the source and material properties for each aggregate surfacing material to be placed in the work meets the Specification requirements, including laboratory optimum moisture-maximum density curves (AASHTO T

180) necessary for field quality control testing.

C. Decomposed Granite: Submit a 5-lb sample.

1. Prepare a test plot as described under Part 1.06 Quality Assurance.

D. Solidifying Emulsion (for decomposed granite): Submit certificate of compliance, and product data including the manufacturers' product sheets and installation instructions.

E. Provide copies of certifications for material testing personnel and laboratories to be used for Contractor Quality Control.

F. Provide required documentation for all Contractor Quality Control material testing as noted in the specifications.

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1.5 REFERENCES

A. The Standard Specifications for Construction of Roads and Bridges on Federal Highway Projects (FP-14) dated 2014; and published revisions thereto.

https://flh.fhwa.dot.gov/resources/specs/

1. Payment descriptions in the FP-14 Standard Specifications shall not apply.

2. In case of conflict with the FP-14 Standard Specifications, the most stringent specification shall apply.

3. “Contracting Officer” as stated in the FP-14 Standard Specifications shall generally be defined as the CEO and General Manager of NPS or the authorized representative for the purposes of these Specifications.

4. References to Transportation Acquisition Regulations (TAR), and references to Federal Acquisition Regulations (FAR) shall not apply.

B. Applicable ASTM and AASHTO standards.

C. A reference within parentheses to a law or regulation is included in the Contract for convenience only and is not a comprehensive listing of related laws and regulations. Lack of a reference does not indicate no related laws or regulations exist.

D. Where the version of a referenced document is not specified, use the most recent version in effect on the date of the Notice to Bidders.

E. A code not specified as a federal code is a California code.

F. An agency or a department not specified as a federal or local agency or department is a California agency or department.

1.6 QUALITY ASSURANCE

A. Conform to the Contract Documents including but not limited to Permits, Technical Conditions, Drawings, and Standard Specifications.

B. Conform to the sampling, testing and acceptance requirements of Section 301.08 or 302.06 of the FP-14 Standard Specifications for the material involved.

C. Testing Agency: NPS may engage a qualified independent geotechnical engineering and/or material testing agency/consultant to perform field quality-control acceptance testing.

D. Inspection: The Contractor shall coordinate with the NPS Representative during all earthwork and aggregate surfacing operations to allow for access to the site as often as necessary for the performance of any special inspections and material testing for verification that the specifications are being met for the installation of materials. Frequency of material testing shall conform to the applicable Specifications, Standards and Test Methods.

E. All Contractor required ‘Quality Control’ materials testing shall be based upon applicable ASTM and AASHTO Test Methods referenced herein for the materials specified. All equipment, material, and labor necessary for Quality Control testing shall be supplied by and all costs borne by the Contractor.

https://flh.fhwa.dot.gov/resources/specs/

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1. Provide copies of all applicable testing procedures and standards (per ASTM and/or

AASHTO).

2. Provide certifications for calibration of all field testing equipment.

3. A report of any field test results and laboratory testing shall be furnished.

4. All deficiencies, which become present from testing shall be rectified, and the materials retested until passed, or materials replaced where non-conforming.

5. All tests shall be performed in the presence of the NPS Representative or designated representative.

F. Decomposed Granite Test Plot

1. Construct a test plot at an authorized location, as directed by the NPS Representative.

2. NPS may order you to remove any test plot not incorporated into the work.

3. Notify NPS at least 7 days before constructing the test plot.

4. NPS will use the authorized test plot to determine acceptability of the work.

5. The test plot must meet the following requirements:

a. At least 10 feet in length, and typical width of the specified work (or no less than 4 feet wide).

b. Constructed using the materials, equipment, and methods to be used in the work.

c. Test plot must be authorized/accepted before starting the decomposed granite work.

1.7 PROJECT CONDITIONS AND REQUIREMENTS

A. All imported aggregate surfacing materials shall be sourced from an accepted supplier, meeting the contract compliance requirements, and certified weed free. Do not change suppliers during course of work unless authorized by NPS.

1.8 TOLERANCES

A. Conform to surface tolerance requirement of Section 301.06 of the FP-14 Standard Specifications.

B. Minimum thicknesses and slopes shall be as shown on the Drawings.

C. The surface of the finished aggregate surfacing materials at any point shall not vary more than

0.05 feet above or below the grade established by the Engineer and as shown on the Drawings.

PART 2 PRODUCTS

2.1 SURFACE COURSE AGGREGATES (ROADWAYS)

A. Conform to Section 703.05, Subbase, Base, and Surface Course Aggregate of the FP-14 Standard Specifications.

1. Conform to the aggregate quality characteristics specified in the FP-14 Standard Specification for surface course aggregate, except for the following adjustments:

a. Los Angeles abrasion, AASHTO T 96 40% max.

b. Fractured faces, ASTM D 5821 75% min.

c. Liquid limit, AASHTO T 89 35 max.

d. Plastic Index, AASHTO T 90

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1) If the percent passing the No. 200 sieve is less than 12% 8 to 12

2) If the percent passing the No. 200 sieve is greater than 12% 4 to 8

B. Obtain the specified aggregate gradation by crushing, screening, and blending processes as necessary. Fine aggregate material passing the No. 4 sieve, shall consist of natural or crushed sand and fine mineral particles.

1. An equivalent gradation class of material, per Caltrans Standards, may be substituted based on available supply, review, and acceptance of submittals.

C. Do not use material that breaks up when alternately frozen and thawed or wetted and dried.

D. Do not furnish material that contains asbestos fibers.

2.2 CRUSHED AGGREGATE

A. Conform to Section 703.06, Crushed Aggregate of the FP-14 Standard Specifications.

B. Aggregate material and gradation shall be as specified for improvement type and area as shown on the Drawings.

1. An equivalent gradation class of material, per Caltrans Standards, may be substituted based on available supply, review, and acceptance of submittals.

C. Do not use material that breaks up when alternately frozen and thawed or wetted and dried.

D. Do not furnish material that contains asbestos fibers.

2.3 DECOMPOSED GRANITE

A. Decomposed granite material and gradation shall meet the following requirements.

1. Uniform tan or gray color.

2. From a single source

3. Crushed granite rock that complies with gradation requirements in table below:

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Decomposed Granite Gradation Requirements

Sieve Size Percent Passing

3/8 inch 100 No. 4 95-100 No. 8 75-80

No. 16 55-65

No. 30 40-50 No. 50 25-35

No. 100 20-25 No. 200 5-15

(Note: Gradation is based on AASHTO T 11 and T 27.)

B. Solidifying Emulsion

1. Solidifying emulsion must be either a water-based polymer or nontoxic organic powdered binder specifically manufactured to harden decomposed granite. The solidifying emulsion must not change the decomposed granite color.

PART 3 EXECUTION

3.1 GENERAL

A. Applicable construction operations for earthwork, excavation and fill shall conform to Section 31 23 00, Excavation and Embankment.

B. Install surface course aggregate for gravel roadways conforming to Section 301, Untreated Aggregate Courses of the FP-14 Standard Specifications.

C. Install crushed aggregate for stabilized pavement shoulder conforming to Section 302, Minor Crushed Aggregate of the FP-14 Standard Specifications.

D. All aggregate surfacing materials used for the work shall be of the class/grading for each improvement type and area as shown on the Drawings and as specified in these Specifications.

E. Contractor shall furnish, transport, place, compact, grade, and otherwise apply all aggregate surfacing materials as necessary to construct and complete all project improvements involved as shown on the Drawings, as specified in these Specifications, and as otherwise directed by the NPS Representative.

3.2 STORAGE OF MATERIALS

A. Aggregate surfacing materials may only be stockpiled at staging and storage areas identified on the Drawings and in accordance with the SWPPP and Project Permits, and shall not be stockpiled in a manner that destroys or damages existing vegetation in areas not shown on Drawings for excavation or grading.

1. Place, grade, and shape stockpiles to drain surface water.

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2. Stockpile materials away from edge of excavations. Do not store within drip line of trees to remain.

3. Cover all stockpiles at the end of each day’s work, and when operations are inactive to prevent windblown dust or erosion from precipitation.

B. Any stockpiles of aggregate surfacing materials shall be protected from contamination with earthen or other unsatisfactory material that may destroy the quality and fitness of the suitable stockpiled material. If the Contractor fails to protect the stockpiles and any material becomes unsatisfactory as a result, such material shall be removed and replaced at no additional cost to

NPS.

C. Areas disturbed by the stockpiling of materials outside of designated staging and storage areas shall be revegetated at the Contractors expense, and no additional compensation will be allowed.

3.3 SUBGRADE PREPARATION

A. Preparation of the subgrade and/or surface on which surface course aggregate is placed shall conform to Section 301.03 of the FP-14 Standard Specifications.

B. Preparation of the subgrade and/or surface on which crushed aggregate is placed shall conform to Section 302.03 of the FP-14 Standard Specifications.

C. Preparation of the subgrade and/or surface on which decomposed granite is placed shall conform to the Drawings and Section 31 23 00, Excavation and Embankment.

D. Before placement and spreading any aggregate surfacing materials, the subgrade or underlying materials must comply with the specified compaction, elevation tolerance, and slopes for the material involved and be free from loose or extraneous material.

E. If the finished subgrade or underlying materials are lower than the grade established by the Engineer and as shown on the Drawings, the applicable overlying material may be placed to fill the low areas. Any aggregate surfacing material placed to fill low areas is not included in the quantity for payment.

3.4 SPREADING

A. Mixing and spreading of surface course aggregate shall comply with Section 301.04 of the FP- 14 Standard Specifications.

B. Mixing and spreading of crushed aggregate shall comply with Section 302.04 of the FP-14 Standard Specifications.

C. Deliver uniform mixtures of aggregate surfacing materials to the specified location and deposit in layers or windrows.

D. Spread and shape aggregate surfacing materials to such thickness that after watering and compacting, the completed section is within the tolerances specified.

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E. When aggregate surfacing materials is spread, the moisture content must be uniform and sufficient to obtain required compaction. Moisture conditioning loose materials before compaction to within at least 2 percent of optimum moisture will yield best results.

F. Avoid material segregation. Aggregate surfacing materials must be free from pockets of coarse or fine material. Upon visual inspection, correction of deficiencies may be required.

G. Where the shown aggregate surfacing materials finished thickness is 0.5 foot or less you may spread and compact the material in one layer. Where the shown finished thickness is more than

0.5 foot, spread and compact the material in 2 or more layers approximately equal in thickness;

the compacted thickness of any one layer must not exceed 0.5 foot.

3.5 COMPACTING & FINISHING

A. Compaction and finishing of surface course aggregates shall conform to Section 301.05 of the FP-14 Standard Specifications.

B. Compaction and finishing of crushed aggregates shall conform to Section 302.05 of the FP-14 Standard Specifications.

C. Compact materials to no less than the specified in-place density (AASHTO T 310) as specified on the Drawings.

D. Compact the full width and depth of the fill and embankment to the limits of the work as shown on the Drawings. Rolling patterns shall progress from the sides to the center.

E. The finished surface shall be within the tolerances specified, at the grade established by the Engineer and as shown on the Drawings.

F. Proof Rolling: Upon completion of the subject layer and any density testing, the Contractor shall demonstrate to the NPS Representative, upon request, that the exposed layer does not contain unidentified soft areas by proof rolling. Proof rolling shall consist of rolling the entire surface with approved mechanical equipment while observing the grade for displacement or deformation.

G. When testing or proof rolling indicates that materials have not achieved degree of compaction specified, scarify and moisten or aerate, or remove and replace to depth required; recompact and retest until specified compaction is obtained.

3.6 DECOMPOSED GRANITE

A. Do not place decomposed granite during rainy conditions.

B. Mix solidifying emulsion thoroughly and uniformly throughout the decomposed granite and under the manufacturer's instructions. Mix the material in the field using portable mixing equipment or have it delivered in mixer trucks from a local ready-mixed plant.

C. Place decomposed granite uniformly in layers no more than 1-1/2 inches thick. Compact each layer of decomposed granite to a relative compaction of not less than 90 percent. Start compaction at least 6 hours but no more than 48 hours after placement.

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D. For field-mixed material, apply a solidifying emulsion after compaction as recommended by the manufacturer. Prevent runoff or overspray of solidifying emulsion onto adjacent paved or planting areas.

E. The finished decomposed granite surface must be smooth, uniform, and compacted to a relative compaction of not less than 90 percent. The finished surface must maintain the original flow lines, slope gradients, and contours of the job site.

END OF SECTION