Specifications include, but are not limited to: All brick shall conform to the Specifications for Sewer Brick (solid masonry units made from Clay or shale) and shall be in compliance with ASTM C32 Grade SM. Brick compressive strength, absorption, and saturation testing shall be performed in compliance with ASTM C67. Sewer Brick shall have a minimum compressive strength of 3,750 psi for individual brick and 5,000 psi for an average of 5 bricks. Maximum absorption, determined by 5 hour boil, shall be 15.0% for individual brick and 12.0% for an average of 5 bricks. Bricks shall conform to the following dimensions, unless otherwise approved by the District. All brick shall be new and whole, of uniform standard size and with substantially straight and parallel edges and square corners. Bricks shall be of compact textures, burned hard entirely through, tough and strong, free from injurious cracks and flaws, and shall have a clear ring when struck together. No soft or salmon brick shall be used in any part of the work. Brick shall be culled after delivery, if required, and no culls shall be used except at such places, to such extent, and under such conditions as may be approved by the District.