Granite. - The granite blocks shall be of medium grained granite, showing an even distribution of its constituent materials. It shall be of uniform quality and texture, without seams or discolorations showing disintegration, and free from an excess of mica or feldspar.

Syenite or hard basaltic stone that will polish under traffic, or any soft or weather-worn stone from the surface or sap of the quarry will not be accepted.

Samples. - Before the material from any quarry will be accepted the operator thereof must file in the office of the Engineer four (4) representative samples of the blocks proposed to be furnished. The samples must be labeled with the names of the operator and the name and location of the quarry or quarries. If these samples are satisfactory, all blocks subsequently furnished must be substantially equal to them in all respects. The Contractor must state in his bid the name and location of the quarry or quarries from which he proposes to obtain his material. No change of quarry or quarries will be allowed without permission.

The Contractor shall submit to the Engineer, bills of lading for all cars of granite as soon as shipped.

Dimensions and Dressing. - The size of the blocks shall be as follows: Not less than six (6) inches or more than ten (10) inches long; not less than three and one-half (3 1/2) inches or more than four and one-half (4 1/2) inches wide and not less than four and three-quarters (4 3/4) inches or more than five and one-quarter (5 1/4) inches deep.

They shall be divided into two classes according to their width, those ranging from 3 1/2 to 4 inches in one class, and from 4 to 4 1/2 inches in another class. They will be shipped in separate cars according to the class in which they come, and so distributed on different parts of the work that they may be placed in pavement in stretches of not less than 100 feet in length.

Short granite blocks used for breaking joints at curbs and rails, shall not be less than five (5) inches long, shall not be under-cut more than one-half (1/2) inch and the ends shall be neatly dressed with block maker's tools in same manner as required for whole blocks.

When approved by the Engineer, the blocks may be of such other dimensions as special construction make necessary.

The blocks shall be substantially rectangular on top and sides, and uniform in thickness. They shall be so cut that the joints between individual blocks when laid shall average not more than % inch. The head of the block shall have no depression greater than 1/4 inch from a straight edge laid in any direction and parallel to the general surface of the block.

Care shall be used in handling the blocks so that the edges and corners shall not be chipped or broken.

If blocks from more than one quarry are permitted, the stones from each quarry shall be piled and laid separately in different sections of the work, and in no case shall the product of different quarries be mixed.

Foundation. - The sub-grade shall be --------- inches below and parallel to the finished grade of the roadway; on the sub-grade prepared, as specified under "Grading," Item 1, will be deposited---------inches of concrete as specified.

The top of the concrete foundation shall be brought by screeding or otherwise to a grade which shall not vary more than 1/4 inch at any point from a surface parallel to and 6 inches below the finished surface of the pavement.

Paving Bed. - The paving bed shall be approximately one and one-quarter (1 1/4) inches in thickness and sufficient to bring the surface of the pavement when thoroughly rolled to the proper grade. It shall consist of (1st) a bed of clean, coarse sand free from pebbles over three-eighths (3/8) inch in diameter or (2nd) of a sand-cement bed mixed and prepared exactly as specified for "Brick Pavement." The bed must be prepared only in such quantity and the entire work laid out in such manner that final rolling of the completed pavement takes place before the cement has Bet, and if any such setting should take place before the rolling, the portion affected must be taken up and repaved on a fresh bed as specified.

Pebbles. - Pebbles for filling joints must be perfectly clean, shall all pass a half-inch screen, and be free of all material passing a 3-16 inch screen. They must be dry when put in the joints, and shall be heated if necessary.

Laying Blocks. - Upon the sand paving bed as specified, the blocks shall be laid in straight courses from curb to curb and at right angles to the lines of the street, except when otherwise directed by the Engineer. The grade and crown shall be as shown on the plan or as directed. End joints shall be broken by a lap of at least 3 inches, and adjoining stones in the same course shall not vary more than 1/4 inch in width. The blocks shall be set in contact at end joints and with side joints as nearly uniform as practicable, and averaging not more than % inch between individual stones.

Guide blocks or head stones shall be set at such intervals as directed by the Engineer.

After the blocks are laid, the joints shall be filled about one-half full with clean, dry pebbles as above specified, only sufficient pebbles being used to prevent the blocks rocking when being rolled.

The pavement shall then be swept clean and rolled with a steam-roller weighing about ten (10) tons, as directed, until the blocks are firmly bedded and are brought to a true and even surface. All low places developed by the rolling shall be taken up, repaved and rerolled, until the pavement is firmly bedded and is brought to an even surface.

Filler. - The filler to be used shall be pitch filler, pitch filler with flush coat, pitch-mastic or cement grout filler, as specified.

(a) PITCH FILLER

The pebbles will then be scratched out to a depth of two and one-half (2 1/2) inches below the top of the blocks. Hot paving pitch, as below specified, and at a temperature of 300 to 350 degrees Fahrenheit shall be poured into the joints so as to fill all voids in the pebbles.