The remaining depth of the joints will then be filled, flush full, with additional pebbles, as above specified. The pebbles must be gotten into the joints with the smallest possible amount of sweeping, and special care must be taken to see that the pebbles are perfectly dry and clean and free from all particles smaller than specified. The hot paving pitch shall then be poured into the joints until they absorb no more and the joints are filled flush full with the pitch-and -pebbles concrete. The joints will be re poured as often as necessary to obtain this result. After the satisfactory completion of the joint filling, the entire surface of the pavement will be immediately covered with a 3/8 inch covering of clean pebbles between 1/8 inch and 1/4 inch in size.

This will complete the pavement, which will be immediately thrown open to traffic.

(b) PITCH FILLER WITH FLUSH COAT

The pebbles will 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 degress Fahrenheit shall then be poured into the joints so as to fill all voids in the pebbles.

Additional pebbles will then be poured into the joints to level of one-quarter (1/4) inch below the top of the paving and the joints will again be poured with paving pitch.

The remaining depth of the joints will then be filled, flush full, with additional pebbles, as above specified. The pebbles must be gotten into the joints with the smallest possible amount of sweeping, and special care must be taken to see that the pebbles are perfectly dry and clean and free from ail particles smaller than specified.

The entire surface of the paving shall then be given a flush coat of paving pitch of melting point satisfactory to the Engineer. This flush coat shall be applied at a temperature of not less than 300 degrees Fahrenheit by means of a rubber squeegee in such manner as to completely fill all joints and leave a light bituminous coating on top of the blocks. A one-quarter (1/4) inch covering of clean, dry pebbles of size between one-eighth (1/8) and one-quarter (1/4) inch will then be evenly applied to the flush coated surface and will be rolled into same with a steam roller.

This will complete the pavement, which will be immediately thrown open to traffic.

(c) PITCH-MASTIC FILLER

The pebbles will 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 then be poured into the joints so as to fill all voids in the pebbles. The balance of the joints will then be filled with a pitch-mastic filler, mixed and finished exactly as specified for "Brick Pavement."

Coal Tar Paying Cement. - The coal tar paving cement shall be a straight run residue from the distillation of coal tar, and shall comply with the following requirements:

Melting point shall be not lower than 110 degrees Fahrenheit nor higher than 125 degrees Fahrenheit. Test for melting point will be made as specified below:

Free carbon shall be not less than 20% nor more than 35%.

Specific gravity at 77 degrees Fahrenheit shall not be less than 1.22 nor more than 1.30.

Specific gravity of the distillate to 670 degrees Fahrenheit shall not be less than 1.06 at 140 degrees Fahrenheit compared with water at the same temperature.

Test for Melting Point. - A clean shaped one-half (1/2) inch cube of the pitch is to be formed in a mold and suspended in a beaker of water so that the bottom of the cube of pitch is one (1) inch above the bottom of the beaker. The pitch is to remain for five (5) minutes in the water at a temperature of 60 degrees F. before heat is applied. Heat is to be applied in such manner that the temperature of the water is raised 9 degrees F. each minute. The temperature recorded by the thermometer at the instant the pitch touches the bottom of the beaker is to be considered the melting point. The filler shall be such that it retains its consistency under extreme ranges of temperature.

The Contractor before beginning work on any contract shall obtain from the Engineer a statement in writing as to the melting points desired for that particular contract, and a variation of 5 degrees Fahrenheit either way will be permitted from this melting point, but within the limits as indicated above.

(d) CEMENT GROUT FILLER

If the pavement is to have cement grout filler an expansion joint must be left along each curb. The expansion joints shall be of same width and formed in the same manner as prescribed for "Brick Pavement," but the depth of the prepared strips shall be five (5) inches.

After the completion of the rolling as above specified, the pebbles shall be washed out of the joints to a depth of one and one-half (1 1/2) inch by means of a hose and nozzle and the cement grout filler applied in a manner similar to that specified for brick paving. The first course of grout, however, shall consist of neat cement, no sand whatever being used; this course will be applied in such quantity as to fill the joints to the level of the top of the pebbles. The second course of grout shall be of one (1) part cement to one (1) part sand as specified for brick paving, and shall be applied in such quantity as to fill the joints flush full and leave a slight surplus on the top of the paving.

As soon as the grout has taken its initial set it shall be covered with one-half (Va) inch of sand and shall be kept continuously moist for five (5) days. It must be kept entirely undisturbed for a period of at least ten (10) days or longer if the Engineer so direct.

Payment. - The price bid per square yard for granite pavement will include all labor and material necessary to complete the pavement above the concrete foundation: it will also include all work, as specified under "Grading," Item 1, where no special bid is asked for the grading item.