B09_Amd_4_04_41_00_Dry_Stacked_Stone_Walls_-_REVISED_0004.pdf

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DRY STACKED STONE WALLS

REHABILITATE CRANE FLAT CAMPGROUND FINAL CONSTRUCTION DOCUMENTS

August 16, 2021

SECTION 04 41 00

PART 1 - GENERAL

1.1 SUMMARY

A. The extent of Work in this Section is shown in the Drawings.

B. Work includes but is not limited to furnishing labor, material, and equipment for the installation of dry-stacked stone walls as shown on the drawings and as specified herein, including the purchase, installation, storage, and shipment.

1.2 RELATED DOCUMENTS

A. Specification Section 01 35 13 – Natural, Cultural, and Physical Resources Protection

B. Specification Section 31 10 10 – Site Clearing

C. Specification Section 31 22 19 – Finished Grading

D. Specification Section 32 11 23 – Aggregate Base

1.3 REFERENCE DOCUMENTS

A. None.

1.4 SUBMITTALS

A. Granite Stone Samples: The Contractor shall submit one sample of dressed or undressed stone for approval by the Contractor Officer. The Contracting Officer will only approve stone that meets requirements of Specification 044100 2.2.A. It will be the Contracting Officer’s judgement, in determining approval of the sample’s aesthetic compatibility with the native stone found at the site, in coloring, patterning, and texture. The stone sample shall be physically submitted to the COR, and shall not weigh less than 8 pounds nor more than 15 pounds. The stone sample shall be accompanied by certification from the stone producer denoting the location of the quarry from where the sample was obtained.

B. Dry-stacked stone walls: Provide a field mock-up using actual material. Construct an 8-foot-long sample section, showing color range, texture, bond pattern, and joints. Approved section shall become the standard of comparison and remain in place until completion of wall work. Sample may be incorporated into completed wall. The area of the mock-up should be sufficient to show typical joints and conditions at end of wall and top of wall, for review and approval by the Contracting Officer.

C. Mason Qualification: Submit documentation indicating competence and experience of supervising mason, documenting at least 2 previous projects with similar type of work and similar material type.

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1.5 QUALITY ASSURANCE

A. Codes and Standards: Perform and provide the Work of Dry Stack Stone Walls in compliance with all applicable local, state, and federal codes, laws, regulations, and accepted standard industry practice.

B. Supervision: Supervision: A person employed by the Contractor who is a qualified and experienced mason familiar with the type of materials being installed and the methods for their installation shall be present at all times during the execution of the work defined in this Section.

Contractor or subcontractor performing working involving the construction of dry stack stone walls shall have experience in similar tasks and be a member of the Mason Contractors Association of America (MCAA) or approved equivalent organization. Masons must be competent and experienced, and must have completed at least 2 previous projects with similar type of work and similar material type.

C. Substitutions of Material and Procurement of Material: Substitutions of material will not be permitted unless authorized in writing by the Contracting Officer’s Representative. Proof must be submitted by the Contractor that materials are unobtainable. Any substitution suggested by the Contractor must be shown to be the equivalent of the specified material. The Contractor's written proposal will be considered for the use of the suggested material which includes any corresponding adjustment in the contract price and time. The proposal will be submitted to the Contracting Officer’s Representative within twenty (20) workdays before beginning the Work of this Section.

D. Work Schedule: The work shall proceed as rapidly as possible. The Contractor shall make every effort to coordinate the work of this section with the work of other trades before, during, and after construction.

E. Warranty and Replacement

1. The Contractor shall secure all manufacturers’ warranties, guarantees and certification of material quality and composition and shall be responsible for these documents during construction. The Contractor shall turn these documents over to the Contracting Officer’s Representative upon completion of the work.

2. The Contractor shall replace at the Contractor's expense any item specified herein which is damaged during construction.

1.6 PRODUCT HANDLING

1. Store materials in a safe and protected manner.

PART 2 - MATERIALS

2.2 STONES FOR DRY-STACKED STONE WALL

A. The material for the dry stacked stone walls shall be Sierra White Granite. Sierra What Granite is a natural granite, fine-grained (1-3mm), primarily light-gray to white in color, with gray-to-black flecking. It is typically comprised of oligoclase, quartz, orthoclase, biotite, muscovite, and other trace components. The material shall be aesthetically compatible with the native stone found at the site, in coloring, patterning, and texture. Slight natural spotting, streaking or color variations will be acceptable on the exposed faces, providing there is no structural deterioration.

B. The term “Sierra White” is a registered trademark of Coldspring, a large domestic supplier of

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natural stone product. However, it is also the traditional colloquial name for the local stone found throughout Yosemite National Park, having the qualities specified in 2.2.A. Use of the phrase “Sierra White” is not intended to imply use of a particular product from a particular supplier. The government will accept any product meeting the contract requirements that exhibit the salient features of 2.2.A.

C. Stones for wall sections are to be sound, hard, and shaped as shown on Drawings. Stones shall be dressed, either at the supplier facility or at the site, to achieve a “natural” appearance, by removing sharp edges and angles.

D. Granite may be salvaged from the project site and as available from trenching operations. Granite salvaged from trenching operations shall be shaped to sizes indicated on Drawings, and to remove sharp edges and angles.

E. It shall be the responsibility of the Contractor to obtain all required stone, and to load, transport and shape the stone as required to meet the requirements for the final product. All stone is subject to approval by the Contracting Officer.

F. The Contractor shall use the following quantities for the purposes of bidding and planning:

Type Quantity Average Length

Average Height

Average Depth

Average Volume

Minimum Volume

Maximum Volume

Estimated Weight

(ea) side-to-side

(inches) top-to-bottom (inches) front-to-back

(inches) (cubic feet) (cubic feet) (cubic feet) (pounds)

Four Man Blocks 200 40 30 30 20.83 18.4 24.5 2000-4000 Three Man Blocks 125 32 24 18 8.00 4.7 11.2 700-2000

Two Man Blocks 100 22 18 12 2.75 1.6 3.6 200-700

G. Each block size may vary in up to 8-inches from the average length, height, and depth required so long as the final block is within the minimum and maximum volume shown.

H. Variation in stone size in required. For each type of block (four-man, three-man, two-man), the Contractor shall have the supplier produce no less than five variations in size. A variation shall be any length or height dimension that changes by more than 2-inches.

2.3 BASE AND DRAINAGE MATERIALS

A. Aggregate base: see Section 32 11 23 – Aggregate Base.

PART 3 - EXECUTION

3.1 GENERAL

A. Contractor shall work with Contracting Officer’s Representative to achieve stonework which complies with the intent of design as shown in the drawings.

3.2 PREPARATION

A. Do any necessary finish grading and compaction in addition to that performed in accordance with

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earthwork to bring subgrades after final compaction to required grades and sections as indicated.

3.3 EXCAVATION AND BACKFILL

A. See Section 31 23 00.

3.4 INSTALLATION

A. Roughly shape stone with a hammer to approximate fit. Knock off weak portions. Knob corners and returns square.

B. Remove or bury all plug and feather marks (drill holes).

C. In walls, use large stones for bottom courses and large selected stones at the corners. Generally, decrease size of stone from bottom to top. Four Man Blocks shall be the foundation stone at all times that the exposed wall height exceeds 16-inches.

D. In walls lay even colored, sound, quarry seam faces to weather on face of wall. Lay face stones in random bond with maximum 2-inch-wide joints. Fit small stones into irregular spaces to give appearance of random sizes and shapes.

E. Distribute headers throughout the wall mass. Extend headers through walls that are 24 inches or less in depth and into core or backing of walls that are deeper than 24 inches.

F. Slope tops of walls to shed water.

G. Dry-laid stone is to be stable and withstand climbing without shifting or moving. Distribute stones of various colors and sizes evenly throughout the work. Select stones roughly squared and pitched to line and place evenly at ends of wall. Lay stones that are flat or stratified in approximately horizontal position, not on edge.

H. Brush free of dust or other foreign matter before placing. Place stones with largest at bottom as keys. Provide batter on back side of wall as necessary for stability. Trim and shim stones as necessary to ensure firm, stable bedding upon one another.

I. Provide sufficient number of stones to install complete walls from lines and grades shown on the drawings and details.

3.2 CLEAN UP

A. Remove any debris, waste products, and excess materials from the site.

B. Scrub completed wall with fiber brushes, using a mild alkaline abrasive cleaner that contains no caustic or harsh fillers. Begin at top and work down. Clean stone thoroughly, leaving no traces of cleaning compound.

END OF SECTION