The bidder shall state in his bid the kind of brick he proposes to use. Before beginning work the successful bidder must submit to the City a written statement from the paving brick manufacturer giving satisfactory evidence that the manufacturer is able and willing to furnish the bidder brick in accordance with the specifications, and in sufficient quantity to complete the work within the required time. No change of brick will be allowed without written permission.

Character of Brick. - All brick must be No. 1 pavers. They must be thoroughly annealed, tough and durable, regular in size, shape, and evenly burned. The use of hillside block will be required where the grade exceeds 5%.

When broken, the brick shall show a dense, stone-like body, free from lime, air pockets, cracks or marked laminations. Kiln marks must not exceed three-sixteenths (3/16) of an inch in depth, and one edge at least shall show but slight kiln marks. All bricks so distorted in burning as to lay unevenly in the pavement shall be rejected.

The paving brick or block to be used shall be 4 inches in depth, between 3 and 3 3/4 inches in width, and from 8 to 9 inches in length. The brick for one improvement shall not vary over 1/8 inch in depth or width. If the edges of the brick are rounded the radius shall not exceed three-sixteenths (3/16) of an inch.

The brick must have lugs so as to provide joints between the brick when laid of approximately three-sixteenths (3/16) inch; either wire cut lug brick or repressed brick with lugs on one side may be used.

Inspection. - All brick shall be subject to thorough inspection before and after laying, and all rejected material shall be immediately removed from the street.

Tests Before Unloading. - The Contractor shall notify the Engineer of the location and car number of each carload of brick received. Samples for testing from such car shall be taken and the car locked by the Engineer, and no brick shall be taken to be delivered on or adjacent to any improvement on which the brick are to be used until a written statement has been received from the Engineer that the samples have passed the required tests and the car has been unlocked. Decision relative to each carload will be made within twenty-four (24) hours of notice. Permission to deliver brick on the line of work shall not be considered a final acceptance in any respect.

Delivery of Brick. - Before the grading is finished the brick shall be hauled, carefully unloaded by hand, and neatly piled between the curb and the property line in such manner as not to unduly obstruct passage. The brick shall be kept clean at all times. If coated or splashed with mud or other dirt they shall be washed clean before their use will be permitted.

Rattler Test. - When tested in the rattler in accordance with the specifications and rules adopted by the National Paving Brick Manufacturers' Association at their annual meeting of 1911, the brick shall lose not over 22%.

Samples for testing shall be taken from each car (estimated at 10,000 brick). Three grades of samples shall be tested, one of the softest one of the medium, and one of the hardest burned. If all of the tests overrun the above percentage of loss, the car shall be rejected. If one or two of the tests overrun, another test of said grade or grades shall be made. Should only one of these tests overrun the specified percentage of loss, the Contractor may cull said grade, provided they do not exceed ten (10) per cent. of the amount of brick in the car, and deliver the balance on the improvement. Otherwise, the whole car will be rejected.

In order to prevent the continued shipments of inferior brick, only two cars of two separate shipments of any make of brick will be tested. Should they fail to meet the requirements stated above, said make of brick will be rejected for this improvement.

Foundation. - The subgrade for brick pavement will be--------- (---------) inches below and parallel to the finished grade of the roadway; on the subgrade prepared as specified under "Grading" Item 1, will be deposited --------- (---------) inches of concrete, as specified under "Concrete." ,

Methods of Paving. - Brick paving may be laid (1) with either a sand cushion or a sand-cement bed and (2) the joints may be filled with either cement grout or with pitch-mastic, or (3) following what is known as the monolithic method. The requirements of the various methods are as specified below, but the methods to be followed for each particular street will be noted under the head of special requirements.

Expansion Joints. - If pitch filler is to be used the brick will be laid directly against the curb; if a cement grout filler is to be used an expansion joint must be provided along each curb line. Expansion joint shall be provided by placing in position, for full depth and width a material previously prepared in the form of a built-up board. This material shall be composed of a preformed solid body of asphalt compound, reinforced on both sides with a layer of asphalt saturated high-grade wool felt. The asphalt used in the board shall be of character satisfactory to the Engineer.

The expansion joint strips shall be about five (5) feet long, shall be four (4) inches deep, and shall be one (1) inch thick for a thirty-foot roadway, and in proportion for roadways of different widths.

Provision shall be made around manholes, inlets, etc., for expansion joints, same as along curbs.

Sand Bed. - The sand shall be clean, moderately coarse and free from loam, clay or foreign matter; it shall be screened free from pebbles exceeding three-eighths (3/8) inch in size.

The sand shall be spread to such depth as will afford a thickness of one (1) inch after compaction. The bed shall be shaped carefully and truly by means of a template satisfactory to the Engineer to the exact contour of the proposed pavement. In locations where the use of a template is not practicable the bed may be shaped by means of a lute. The bed must be- prepared at least forty (40) feet in advance of the paving.